chiark - git - mdw - catacomb-python/blob - algorithms.c

   1 /* -*-c-*-
   2  *
   3  * Symmetric cryptography
   4  *
   5  * (c) 2004 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the Python interface to Catacomb.
  11  *
  12  * Catacomb/Python is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * Catacomb/Python is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with Catacomb/Python; if not, write to the Free Software Foundation,
  24  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 /*----- Header files ------------------------------------------------------*/
  28
  29 #include "catacomb-python.h"
  30 PUBLIC_SYMBOLS;
  31 #include "algorithms.h"
  32 PRIVATE_SYMBOLS;
  33
  34 /*----- Key sizes ---------------------------------------------------------*/
  35
  36 static PyTypeObject *keysz_pytype;
  37 static PyTypeObject *keyszany_pytype, *keyszrange_pytype, *keyszset_pytype;
  38
  39 typedef struct keysz_pyobj {
  40   PyObject_HEAD
  41   int dfl;
  42 } keysz_pyobj;
  43
  44 typedef struct keyszrange_pyobj {
  45   PyObject_HEAD
  46   int dfl;
  47   int min, max, mod;
  48 } keyszrange_pyobj;
  49
  50 typedef struct keyszset_pyobj {
  51   PyObject_HEAD
  52   int dfl;
  53   PyObject *set;
  54 } keyszset_pyobj;
  55
  56 #define KEYSZ_PYCHECK(o) PyObject_TypeCheck((o), keysz_pytype)
  57
  58 #ifndef KSZ_OPMASK
  59 #  define KSZ_OPMASK 0x1f
  60 #endif
  61
  62 #ifndef KSZ_16BIT
  63 #  define KSZ_16BIT 0x20
  64 #endif
  65
  66 PyObject *keysz_pywrap(const octet *k)
  67 {
  68   unsigned op = *k++;
  69 #define ARG(i) (op&KSZ_16BIT ? LOAD16(k + 2*(i)) : k[i])
  70   switch (op&KSZ_OPMASK) {
  71     case KSZ_ANY: {
  72       keysz_pyobj *o = PyObject_New(keysz_pyobj, keyszany_pytype);
  73       o->dfl = ARG(0);
  74       return ((PyObject *)o);
  75     } break;
  76     case KSZ_RANGE: {
  77       keyszrange_pyobj *o =
  78         PyObject_New(keyszrange_pyobj, keyszrange_pytype);
  79       o->dfl = ARG(0);
  80       o->min = ARG(1);
  81       o->max = ARG(2);
  82       o->mod = ARG(3);
  83       if (!o->mod) o->mod = 1;
  84       return ((PyObject *)o);
  85     } break;
  86     case KSZ_SET: {
  87       keyszset_pyobj *o =
  88         PyObject_New(keyszset_pyobj, keyszset_pytype);
  89       int i, n;
  90       o->dfl = ARG(0);
  91       for (i = 0; ARG(i); i++) ;
  92       n = i; o->set = PyTuple_New(n);
  93       for (i = 0; i < n; i++)
  94         PyTuple_SET_ITEM(o->set, i, PyInt_FromLong(ARG(i)));
  95       return ((PyObject *)o);
  96     } break;
  97     default:
  98       abort();
  99   }
 100 #undef ARG
 101 }
 102
 103 static PyObject *keyszany_pynew(PyTypeObject *ty,
 104                                 PyObject *arg, PyObject *kw)
 105 {
 106   static const char *const kwlist[] = { "default", 0 };
 107   int dfl;
 108   keysz_pyobj *o;
 109
 110   if (!PyArg_ParseTupleAndKeywords(arg, kw, "i:new", KWLIST, &dfl))
 111     goto end;
 112   if (dfl < 0) VALERR("key size cannot be negative");
 113   o = (keysz_pyobj *)ty->tp_alloc(ty, 0);
 114   o->dfl = dfl;
 115   return ((PyObject *)o);
 116 end:
 117   return (0);
 118 }
 119
 120 static PyObject *keyszrange_pynew(PyTypeObject *ty,
 121                                   PyObject *arg, PyObject *kw)
 122 {
 123   static const char *const kwlist[] = { "default", "min", "max", "mod", 0 };
 124   int dfl, min = 0, max = 0, mod = 1;
 125   keyszrange_pyobj *o;
 126
 127   if (!PyArg_ParseTupleAndKeywords(arg, kw, "i|iii:new", KWLIST,
 128                                    &dfl, &min, &max, &mod))
 129     goto end;
 130   if (dfl < 0 || min < 0) VALERR("key size cannot be negative");
 131   if (min > dfl || (max && dfl > max)) VALERR("bad key size bounds");
 132   if (mod <= 0 || dfl%mod || min%mod || max%mod)
 133     VALERR("bad key size modulus");
 134   o = (keyszrange_pyobj *)ty->tp_alloc(ty, 0);
 135   o->dfl = dfl;
 136   o->min = min;
 137   o->max = max;
 138   o->mod = mod;
 139   return ((PyObject *)o);
 140 end:
 141   return (0);
 142 }
 143
 144 static PyObject *keyszset_pynew(PyTypeObject *ty,
 145                                 PyObject *arg, PyObject *kw)
 146 {
 147   static const char *const kwlist[] = { "default", "set", 0 };
 148   int dfl, i, n, xx;
 149   PyObject *set = 0;
 150   PyObject *x = 0, *l = 0;
 151   keyszset_pyobj *o = 0;
 152
 153   if (!PyArg_ParseTupleAndKeywords(arg, kw, "i|O:new", KWLIST, &dfl, &set))
 154     goto end;
 155   if (!set) set = PyTuple_New(0);
 156   else Py_INCREF(set);
 157   if (!PySequence_Check(set)) TYERR("want a sequence");
 158   n = PySequence_Size(set); if (n < 0) goto end;
 159   l = PyList_New(0); if (!l) goto end;
 160   if (dfl < 0) VALERR("key size cannot be negative");
 161   x = PyInt_FromLong(dfl);
 162   PyList_Append(l, x);
 163   Py_DECREF(x);
 164   x = 0;
 165   for (i = 0; i < n; i++) {
 166     if ((x = PySequence_GetItem(set, i)) == 0) goto end;
 167     xx = PyInt_AsLong(x);
 168     if (PyErr_Occurred()) goto end;
 169     if (xx == dfl) continue;
 170     if (xx < 0) VALERR("key size cannot be negative");
 171     PyList_Append(l, x);
 172     Py_DECREF(x);
 173     x = 0;
 174   }
 175   Py_DECREF(set);
 176   if ((set = PySequence_Tuple(l)) == 0) goto end;
 177   o = (keyszset_pyobj *)ty->tp_alloc(ty, 0);
 178   o->dfl = dfl;
 179   o->set = set;
 180   Py_INCREF(set);
 181 end:
 182   Py_XDECREF(set);
 183   Py_XDECREF(l);
 184   Py_XDECREF(x);
 185   return ((PyObject *)o);
 186 }
 187
 188 static PyObject *kaget_min(PyObject *me, void *hunoz)
 189   { return (PyInt_FromLong(0)); }
 190 #define kaget_max kaget_min
 191
 192 static PyObject *ksget_min(PyObject *me, void *hunoz)
 193 {
 194   PyObject *set = ((keyszset_pyobj *)me)->set;
 195   int i, n, y, x = -1;
 196   n = PyTuple_GET_SIZE(set);
 197   for (i = 0; i < n; i++) {
 198     y = PyInt_AS_LONG(PyTuple_GET_ITEM(set, i));
 199     if (x == -1 || y < x) x = y;
 200   }
 201   return (PyInt_FromLong(x));
 202 }
 203
 204 static PyObject *ksget_max(PyObject *me, void *hunoz)
 205 {
 206   PyObject *set = ((keyszset_pyobj *)me)->set;
 207   int i, n, y, x = -1;
 208   n = PyTuple_GET_SIZE(set);
 209   for (i = 0; i < n; i++) {
 210     y = PyInt_AS_LONG(PyTuple_GET_ITEM(set, i));
 211     if (y > x) x = y;
 212   }
 213   return (PyInt_FromLong(x));
 214 }
 215
 216 static PyMemberDef keysz_pymembers[] = {
 217 #define MEMBERSTRUCT keysz_pyobj
 218 #define default dfl /* ugh! */
 219   MEMBER(default, T_INT,  READONLY, "KSZ.default -> default key size")
 220 #undef default
 221 #undef MEMBERSTRUCT
 222   { 0 }
 223 };
 224
 225 static PyGetSetDef keyszany_pygetset[] = {
 226 #define GETSETNAME(op, name) ka##op##_##name
 227   GET   (min,           "KSZ.min -> smallest allowed key size")
 228   GET   (max,           "KSZ.max -> largest allowed key size")
 229 #undef GETSETNAME
 230   { 0 }
 231 };
 232
 233 static PyMemberDef keyszrange_pymembers[] = {
 234 #define MEMBERSTRUCT keyszrange_pyobj
 235   MEMBER(min,   T_INT,    READONLY, "KSZ.min -> smallest allowed key size")
 236   MEMBER(max,   T_INT,    READONLY, "KSZ.max -> largest allowed key size")
 237   MEMBER(mod,   T_INT,    READONLY,
 238                             "KSZ.mod -> key size must be a multiple of this")
 239 #undef MEMBERSTRUCT
 240   { 0 }
 241 };
 242
 243 static PyGetSetDef keyszset_pygetset[] = {
 244 #define GETSETNAME(op, name) ks##op##_##name
 245   GET   (min,           "KSZ.min -> smallest allowed key size")
 246   GET   (max,           "KSZ.max -> largest allowed key size")
 247 #undef GETSETNAME
 248   { 0 }
 249 };
 250
 251 static PyMemberDef keyszset_pymembers[] = {
 252 #define MEMBERSTRUCT keyszset_pyobj
 253   MEMBER(set,   T_OBJECT, READONLY, "KSZ.set -> allowed key sizes")
 254 #undef MEMBERSTRUCT
 255   { 0 }
 256 };
 257
 258 static PyTypeObject keysz_pytype_skel = {
 259   PyObject_HEAD_INIT(0) 0,              /* Header */
 260   "KeySZ",                              /* @tp_name@ */
 261   sizeof(keysz_pyobj),                  /* @tp_basicsize@ */
 262   0,                                    /* @tp_itemsize@ */
 263
 264   0,                                    /* @tp_dealloc@ */
 265   0,                                    /* @tp_print@ */
 266   0,                                    /* @tp_getattr@ */
 267   0,                                    /* @tp_setattr@ */
 268   0,                                    /* @tp_compare@ */
 269   0,                                    /* @tp_repr@ */
 270   0,                                    /* @tp_as_number@ */
 271   0,                                    /* @tp_as_sequence@ */
 272   0,                                    /* @tp_as_mapping@ */
 273   0,                                    /* @tp_hash@ */
 274   0,                                    /* @tp_call@ */
 275   0,                                    /* @tp_str@ */
 276   0,                                    /* @tp_getattro@ */
 277   0,                                    /* @tp_setattro@ */
 278   0,                                    /* @tp_as_buffer@ */
 279   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 280     Py_TPFLAGS_BASETYPE,
 281
 282   /* @tp_doc@ */
 283   "Key size constraints.  Abstract.",
 284
 285   0,                                    /* @tp_traverse@ */
 286   0,                                    /* @tp_clear@ */
 287   0,                                    /* @tp_richcompare@ */
 288   0,                                    /* @tp_weaklistoffset@ */
 289   0,                                    /* @tp_iter@ */
 290   0,                                    /* @tp_iternext@ */
 291   0,                                    /* @tp_methods@ */
 292   keysz_pymembers,                      /* @tp_members@ */
 293   0,                                    /* @tp_getset@ */
 294   0,                                    /* @tp_base@ */
 295   0,                                    /* @tp_dict@ */
 296   0,                                    /* @tp_descr_get@ */
 297   0,                                    /* @tp_descr_set@ */
 298   0,                                    /* @tp_dictoffset@ */
 299   0,                                    /* @tp_init@ */
 300   PyType_GenericAlloc,                  /* @tp_alloc@ */
 301   abstract_pynew,                       /* @tp_new@ */
 302   0,                                    /* @tp_free@ */
 303   0                                     /* @tp_is_gc@ */
 304 };
 305
 306 static PyTypeObject keyszany_pytype_skel = {
 307   PyObject_HEAD_INIT(0) 0,              /* Header */
 308   "KeySZAny",                           /* @tp_name@ */
 309   sizeof(keysz_pyobj),                  /* @tp_basicsize@ */
 310   0,                                    /* @tp_itemsize@ */
 311
 312   0,                                    /* @tp_dealloc@ */
 313   0,                                    /* @tp_print@ */
 314   0,                                    /* @tp_getattr@ */
 315   0,                                    /* @tp_setattr@ */
 316   0,                                    /* @tp_compare@ */
 317   0,                                    /* @tp_repr@ */
 318   0,                                    /* @tp_as_number@ */
 319   0,                                    /* @tp_as_sequence@ */
 320   0,                                    /* @tp_as_mapping@ */
 321   0,                                    /* @tp_hash@ */
 322   0,                                    /* @tp_call@ */
 323   0,                                    /* @tp_str@ */
 324   0,                                    /* @tp_getattro@ */
 325   0,                                    /* @tp_setattro@ */
 326   0,                                    /* @tp_as_buffer@ */
 327   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 328     Py_TPFLAGS_BASETYPE,
 329
 330   /* @tp_doc@ */
 331   "KeySZAny(DEFAULT)\n"
 332   "  Key size constraints.  This object imposes no constraints on size.",
 333
 334   0,                                    /* @tp_traverse@ */
 335   0,                                    /* @tp_clear@ */
 336   0,                                    /* @tp_richcompare@ */
 337   0,                                    /* @tp_weaklistoffset@ */
 338   0,                                    /* @tp_iter@ */
 339   0,                                    /* @tp_iternext@ */
 340   0,                                    /* @tp_methods@ */
 341   0,                                    /* @tp_members@ */
 342   keyszany_pygetset,                    /* @tp_getset@ */
 343   0,                                    /* @tp_base@ */
 344   0,                                    /* @tp_dict@ */
 345   0,                                    /* @tp_descr_get@ */
 346   0,                                    /* @tp_descr_set@ */
 347   0,                                    /* @tp_dictoffset@ */
 348   0,                                    /* @tp_init@ */
 349   PyType_GenericAlloc,                  /* @tp_alloc@ */
 350   keyszany_pynew,                       /* @tp_new@ */
 351   0,                                    /* @tp_free@ */
 352   0                                     /* @tp_is_gc@ */
 353 };
 354
 355 static PyTypeObject keyszrange_pytype_skel = {
 356   PyObject_HEAD_INIT(0) 0,              /* Header */
 357   "KeySZRange",                         /* @tp_name@ */
 358   sizeof(keyszrange_pyobj),             /* @tp_basicsize@ */
 359   0,                                    /* @tp_itemsize@ */
 360
 361   0,                                    /* @tp_dealloc@ */
 362   0,                                    /* @tp_print@ */
 363   0,                                    /* @tp_getattr@ */
 364   0,                                    /* @tp_setattr@ */
 365   0,                                    /* @tp_compare@ */
 366   0,                                    /* @tp_repr@ */
 367   0,                                    /* @tp_as_number@ */
 368   0,                                    /* @tp_as_sequence@ */
 369   0,                                    /* @tp_as_mapping@ */
 370   0,                                    /* @tp_hash@ */
 371   0,                                    /* @tp_call@ */
 372   0,                                    /* @tp_str@ */
 373   0,                                    /* @tp_getattro@ */
 374   0,                                    /* @tp_setattro@ */
 375   0,                                    /* @tp_as_buffer@ */
 376   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 377     Py_TPFLAGS_BASETYPE,
 378
 379   /* @tp_doc@ */
 380   "KeySZRange(DEFAULT, [min = 0], [max = 0], [mod = 1])\n"
 381   "  Key size constraints: size must be between MIN and MAX inclusive, and\n"
 382   "  be a multiple of MOD.",
 383
 384   0,                                    /* @tp_traverse@ */
 385   0,                                    /* @tp_clear@ */
 386   0,                                    /* @tp_richcompare@ */
 387   0,                                    /* @tp_weaklistoffset@ */
 388   0,                                    /* @tp_iter@ */
 389   0,                                    /* @tp_iternext@ */
 390   0,                                    /* @tp_methods@ */
 391   keyszrange_pymembers,                 /* @tp_members@ */
 392   0,                                    /* @tp_getset@ */
 393   0,                                    /* @tp_base@ */
 394   0,                                    /* @tp_dict@ */
 395   0,                                    /* @tp_descr_get@ */
 396   0,                                    /* @tp_descr_set@ */
 397   0,                                    /* @tp_dictoffset@ */
 398   0,                                    /* @tp_init@ */
 399   PyType_GenericAlloc,                  /* @tp_alloc@ */
 400   keyszrange_pynew,                     /* @tp_new@ */
 401   0,                                    /* @tp_free@ */
 402   0                                     /* @tp_is_gc@ */
 403 };
 404
 405 static PyTypeObject keyszset_pytype_skel = {
 406   PyObject_HEAD_INIT(0) 0,              /* Header */
 407   "KeySZSet",                           /* @tp_name@ */
 408   sizeof(keyszset_pyobj),               /* @tp_basicsize@ */
 409   0,                                    /* @tp_itemsize@ */
 410
 411   0,                                    /* @tp_dealloc@ */
 412   0,                                    /* @tp_print@ */
 413   0,                                    /* @tp_getattr@ */
 414   0,                                    /* @tp_setattr@ */
 415   0,                                    /* @tp_compare@ */
 416   0,                                    /* @tp_repr@ */
 417   0,                                    /* @tp_as_number@ */
 418   0,                                    /* @tp_as_sequence@ */
 419   0,                                    /* @tp_as_mapping@ */
 420   0,                                    /* @tp_hash@ */
 421   0,                                    /* @tp_call@ */
 422   0,                                    /* @tp_str@ */
 423   0,                                    /* @tp_getattro@ */
 424   0,                                    /* @tp_setattro@ */
 425   0,                                    /* @tp_as_buffer@ */
 426   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 427     Py_TPFLAGS_BASETYPE,
 428
 429   /* @tp_doc@ */
 430   "KeySZSet(DEFAULT, SEQ)\n"
 431   "  Key size constraints: size must be DEFAULT or an element of SEQ.",
 432
 433   0,                                    /* @tp_traverse@ */
 434   0,                                    /* @tp_clear@ */
 435   0,                                    /* @tp_richcompare@ */
 436   0,                                    /* @tp_weaklistoffset@ */
 437   0,                                    /* @tp_iter@ */
 438   0,                                    /* @tp_iternext@ */
 439   0,                                    /* @tp_methods@ */
 440   keyszset_pymembers,                   /* @tp_members@ */
 441   keyszset_pygetset,                    /* @tp_getset@ */
 442   0,                                    /* @tp_base@ */
 443   0,                                    /* @tp_dict@ */
 444   0,                                    /* @tp_descr_get@ */
 445   0,                                    /* @tp_descr_set@ */
 446   0,                                    /* @tp_dictoffset@ */
 447   0,                                    /* @tp_init@ */
 448   PyType_GenericAlloc,                  /* @tp_alloc@ */
 449   keyszset_pynew,                       /* @tp_new@ */
 450   0,                                    /* @tp_free@ */
 451   0                                     /* @tp_is_gc@ */
 452 };
 453
 454 #define KSZCONVOP(op)                                                   \
 455   static PyObject *meth__KeySZ_##op(PyObject *me, PyObject *arg)        \
 456   {                                                                     \
 457     double x, y;                                                        \
 458     if (!PyArg_ParseTuple(arg, "Od:" #op, &me, &x)) return (0);         \
 459     y = keysz_##op(x);                                                  \
 460     return (PyFloat_FromDouble(y));                                     \
 461   }
 462 KSZCONVOP(fromdl)
 463 KSZCONVOP(fromschnorr)
 464 KSZCONVOP(fromif)
 465 KSZCONVOP(fromec)
 466 KSZCONVOP(todl)
 467 KSZCONVOP(toschnorr)
 468 KSZCONVOP(toif)
 469 KSZCONVOP(toec)
 470 #undef KSZCONVOP
 471
 472 /*----- Symmetric encryption ----------------------------------------------*/
 473
 474 static PyTypeObject *gccipher_pytype, *gcipher_pytype;
 475
 476 typedef struct gccipher_pyobj {
 477   PyHeapTypeObject ty;
 478   gccipher *cc;
 479 } gccipher_pyobj;
 480
 481 #define GCCIPHER_PYCHECK(o) PyObject_TypeCheck((o), gccipher_pytype)
 482 #define GCCIPHER_CC(o) (((gccipher_pyobj *)(o))->cc)
 483
 484 typedef struct gcipher_pyobj {
 485   PyObject_HEAD
 486   gcipher *c;
 487 } gcipher_pyobj;
 488
 489 #define GCIPHER_PYCHECK(o) PyObject_TypeCheck((o), gcipher_pytype)
 490 #define GCIPHER_C(o) (((gcipher_pyobj *)(o))->c)
 491
 492 CONVFUNC(gccipher, gccipher *, GCCIPHER_CC)
 493
 494 static PyObject *gcipher_pywrap(PyObject *cobj, gcipher *c)
 495 {
 496   gcipher_pyobj *g;
 497   if (!cobj) cobj = gccipher_pywrap((/*unconst*/ gccipher *)GC_CLASS(c));
 498   else Py_INCREF(cobj);
 499   g = PyObject_NEW(gcipher_pyobj, (PyTypeObject *)cobj);
 500   g->c = c;
 501   return ((PyObject *)g);
 502 }
 503
 504 static PyObject *gcipher_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
 505 {
 506   static const char *const kwlist[] = { "k", 0 };
 507   char *k;
 508   Py_ssize_t sz;
 509
 510   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &k, &sz))
 511     goto end;
 512   if (keysz(sz, GCCIPHER_CC(ty)->keysz) != sz) VALERR("bad key length");
 513   return (gcipher_pywrap((PyObject *)ty,
 514                          GC_INIT(GCCIPHER_CC(ty), k, sz)));
 515 end:
 516   return (0);
 517 }
 518
 519 PyObject *gccipher_pywrap(gccipher *cc)
 520 {
 521   gccipher_pyobj *g = newtype(gccipher_pytype, 0, cc->name);
 522   g->cc = cc;
 523   g->ty.ht_type.tp_basicsize = sizeof(gcipher_pyobj);
 524   g->ty.ht_type.tp_base = gcipher_pytype;
 525   Py_INCREF(gcipher_pytype);
 526   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
 527                             Py_TPFLAGS_BASETYPE |
 528                             Py_TPFLAGS_HEAPTYPE);
 529   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
 530   g->ty.ht_type.tp_free = 0;
 531   g->ty.ht_type.tp_new = gcipher_pynew;
 532   typeready(&g->ty.ht_type);
 533   return ((PyObject *)g);
 534 }
 535
 536 static void gcipher_pydealloc(PyObject *me)
 537 {
 538   GC_DESTROY(GCIPHER_C(me));
 539   Py_DECREF(me->ob_type);
 540   FREEOBJ(me);
 541 }
 542
 543 static PyObject *gccget_name(PyObject *me, void *hunoz)
 544   { return (PyString_FromString(GCCIPHER_CC(me)->name)); }
 545
 546 static PyObject *gccget_keysz(PyObject *me, void *hunoz)
 547   { return (keysz_pywrap(GCCIPHER_CC(me)->keysz)); }
 548
 549 static PyObject *gccget_blksz(PyObject *me, void *hunoz)
 550   { return (PyInt_FromLong(GCCIPHER_CC(me)->blksz)); }
 551
 552 static PyObject *gcmeth_encrypt(PyObject *me, PyObject *arg)
 553 {
 554   char *p;
 555   Py_ssize_t sz;
 556   PyObject *rc = 0;
 557
 558   if (!PyArg_ParseTuple(arg, "s#:encrypt", &p, &sz)) return (0);
 559   rc = bytestring_pywrap(0, sz);
 560   GC_ENCRYPT(GCIPHER_C(me), p, PyString_AS_STRING(rc), sz);
 561   return (rc);
 562 }
 563
 564 static PyObject *gcmeth_enczero(PyObject *me, PyObject *arg)
 565 {
 566   char *p;
 567   int sz;
 568   PyObject *rc = 0;
 569
 570   if (!PyArg_ParseTuple(arg, "i:enczero", &sz)) return (0);
 571   rc = bytestring_pywrap(0, sz);
 572   p = PyString_AS_STRING(rc);
 573   memset(p, 0, sz);
 574   GC_ENCRYPT(GCIPHER_C(me), p, p, sz);
 575   return (rc);
 576 }
 577
 578 static PyObject *gcmeth_decrypt(PyObject *me, PyObject *arg)
 579 {
 580   char *p;
 581   Py_ssize_t sz;
 582   PyObject *rc = 0;
 583
 584   if (!PyArg_ParseTuple(arg, "s#:decrypt", &p, &sz)) return (0);
 585   rc = bytestring_pywrap(0, sz);
 586   GC_DECRYPT(GCIPHER_C(me), p, PyString_AS_STRING(rc), sz);
 587   return (rc);
 588 }
 589
 590 static PyObject *gcmeth_deczero(PyObject *me, PyObject *arg)
 591 {
 592   char *p;
 593   int sz;
 594   PyObject *rc = 0;
 595
 596   if (!PyArg_ParseTuple(arg, "i:deczero", &sz)) return (0);
 597   rc = bytestring_pywrap(0, sz);
 598   p = PyString_AS_STRING(rc);
 599   memset(p, 0, sz);
 600   GC_DECRYPT(GCIPHER_C(me), p, p, sz);
 601   return (rc);
 602 }
 603
 604 static PyObject *gcmeth_setiv(PyObject *me, PyObject *arg)
 605 {
 606   char *p;
 607   Py_ssize_t sz;
 608
 609   if (!PyArg_ParseTuple(arg, "s#:setiv", &p, &sz)) goto end;
 610   if (!GCIPHER_C(me)->ops->setiv) VALERR("`setiv' not supported");
 611   if (!GC_CLASS(GCIPHER_C(me))->blksz) VALERR("not a block cipher mode");
 612   if (sz != GC_CLASS(GCIPHER_C(me))->blksz) VALERR("bad IV length");
 613   GC_SETIV(GCIPHER_C(me), p);
 614   RETURN_ME;
 615 end:
 616   return (0);
 617 }
 618
 619 static PyObject *gcmeth_bdry(PyObject *me, PyObject *arg)
 620 {
 621   if (!PyArg_ParseTuple(arg, ":bdry")) goto end;
 622   if (!GCIPHER_C(me)->ops->bdry) VALERR("`bdry' not supported");
 623   if (!GC_CLASS(GCIPHER_C(me))->blksz) VALERR("not a block cipher mode");
 624   GC_BDRY(GCIPHER_C(me));
 625   RETURN_ME;
 626 end:
 627   return (0);
 628 }
 629
 630 static PyGetSetDef gccipher_pygetset[] = {
 631 #define GETSETNAME(op, name) gcc##op##_##name
 632   GET   (keysz,         "CC.keysz -> acceptable key sizes")
 633   GET   (blksz,         "CC.blksz -> block size, or zero")
 634   GET   (name,          "CC.name -> name of this kind of cipher")
 635 #undef GETSETNAME
 636   { 0 }
 637 };
 638
 639 static PyMethodDef gcipher_pymethods[] = {
 640 #define METHNAME(name) gcmeth_##name
 641   METH  (encrypt,       "C.encrypt(PT) -> CT")
 642   METH  (enczero,       "C.enczero(N) -> CT")
 643   METH  (decrypt,       "C.decrypt(CT) -> PT")
 644   METH  (deczero,       "C.deczero(N) -> PT")
 645   METH  (setiv,         "C.setiv(IV)")
 646   METH  (bdry,          "C.bdry()")
 647 #undef METHNAME
 648   { 0 }
 649 };
 650
 651 static PyTypeObject gccipher_pytype_skel = {
 652   PyObject_HEAD_INIT(0) 0,              /* Header */
 653   "GCCipher",                           /* @tp_name@ */
 654   sizeof(gccipher_pyobj),               /* @tp_basicsize@ */
 655   0,                                    /* @tp_itemsize@ */
 656
 657   0,                                    /* @tp_dealloc@ */
 658   0,                                    /* @tp_print@ */
 659   0,                                    /* @tp_getattr@ */
 660   0,                                    /* @tp_setattr@ */
 661   0,                                    /* @tp_compare@ */
 662   0,                                    /* @tp_repr@ */
 663   0,                                    /* @tp_as_number@ */
 664   0,                                    /* @tp_as_sequence@ */
 665   0,                                    /* @tp_as_mapping@ */
 666   0,                                    /* @tp_hash@ */
 667   0,                                    /* @tp_call@ */
 668   0,                                    /* @tp_str@ */
 669   0,                                    /* @tp_getattro@ */
 670   0,                                    /* @tp_setattro@ */
 671   0,                                    /* @tp_as_buffer@ */
 672   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 673     Py_TPFLAGS_BASETYPE,
 674
 675   /* @tp_doc@ */
 676   "Symmetric cipher metaclass.",
 677
 678   0,                                    /* @tp_traverse@ */
 679   0,                                    /* @tp_clear@ */
 680   0,                                    /* @tp_richcompare@ */
 681   0,                                    /* @tp_weaklistoffset@ */
 682   0,                                    /* @tp_iter@ */
 683   0,                                    /* @tp_iternext@ */
 684   0,                                    /* @tp_methods@ */
 685   0,                                    /* @tp_members@ */
 686   gccipher_pygetset,                    /* @tp_getset@ */
 687   0,                                    /* @tp_base@ */
 688   0,                                    /* @tp_dict@ */
 689   0,                                    /* @tp_descr_get@ */
 690   0,                                    /* @tp_descr_set@ */
 691   0,                                    /* @tp_dictoffset@ */
 692   0,                                    /* @tp_init@ */
 693   PyType_GenericAlloc,                  /* @tp_alloc@ */
 694   abstract_pynew,                       /* @tp_new@ */
 695   0,                                    /* @tp_free@ */
 696   0                                     /* @tp_is_gc@ */
 697 };
 698
 699 static PyTypeObject gcipher_pytype_skel = {
 700   PyObject_HEAD_INIT(0) 0,              /* Header */
 701   "GCipher",                            /* @tp_name@ */
 702   sizeof(gcipher_pyobj),                /* @tp_basicsize@ */
 703   0,                                    /* @tp_itemsize@ */
 704
 705   gcipher_pydealloc,                    /* @tp_dealloc@ */
 706   0,                                    /* @tp_print@ */
 707   0,                                    /* @tp_getattr@ */
 708   0,                                    /* @tp_setattr@ */
 709   0,                                    /* @tp_compare@ */
 710   0,                                    /* @tp_repr@ */
 711   0,                                    /* @tp_as_number@ */
 712   0,                                    /* @tp_as_sequence@ */
 713   0,                                    /* @tp_as_mapping@ */
 714   0,                                    /* @tp_hash@ */
 715   0,                                    /* @tp_call@ */
 716   0,                                    /* @tp_str@ */
 717   0,                                    /* @tp_getattro@ */
 718   0,                                    /* @tp_setattro@ */
 719   0,                                    /* @tp_as_buffer@ */
 720   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 721     Py_TPFLAGS_BASETYPE,
 722
 723   /* @tp_doc@ */
 724   "Symmetric cipher, abstract base class.",
 725
 726   0,                                    /* @tp_traverse@ */
 727   0,                                    /* @tp_clear@ */
 728   0,                                    /* @tp_richcompare@ */
 729   0,                                    /* @tp_weaklistoffset@ */
 730   0,                                    /* @tp_iter@ */
 731   0,                                    /* @tp_iternext@ */
 732   gcipher_pymethods,                    /* @tp_methods@ */
 733   0,                                    /* @tp_members@ */
 734   0,                                    /* @tp_getset@ */
 735   0,                                    /* @tp_base@ */
 736   0,                                    /* @tp_dict@ */
 737   0,                                    /* @tp_descr_get@ */
 738   0,                                    /* @tp_descr_set@ */
 739   0,                                    /* @tp_dictoffset@ */
 740   0,                                    /* @tp_init@ */
 741   PyType_GenericAlloc,                  /* @tp_alloc@ */
 742   abstract_pynew,                       /* @tp_new@ */
 743   0,                                    /* @tp_free@ */
 744   0                                     /* @tp_is_gc@ */
 745 };
 746
 747 /*----- Authenticated encryption ------------------------------------------*/
 748
 749 static PyTypeObject *gcaead_pytype, *gaeadkey_pytype;
 750 static PyTypeObject *gcaeadaad_pytype, *gaeadaad_pytype;
 751 static PyTypeObject *gcaeadenc_pytype, *gaeadenc_pytype;
 752 static PyTypeObject *gcaeaddec_pytype, *gaeaddec_pytype;
 753
 754 typedef struct gcaead_pyobj {
 755   PyHeapTypeObject ty;
 756   gcaead *aec;
 757   struct gcaeadaad_pyobj *aad;
 758   struct gcaeadenc_pyobj *enc;
 759   struct gcaeaddec_pyobj *dec;
 760 } gcaead_pyobj;
 761
 762 #define GCAEAD_PYCHECK(o) PyObject_TypeCheck((o), gcaead_pytype)
 763 #define GCAEAD_AEC(o) (((gcaead_pyobj *)(o))->aec)
 764 #define GCAEAD_AAD(o) (((gcaead_pyobj *)(o))->aad)
 765 #define GCAEAD_ENC(o) (((gcaead_pyobj *)(o))->enc)
 766 #define GCAEAD_DEC(o) (((gcaead_pyobj *)(o))->dec)
 767 static PyObject *gcaead_pywrap(gcaead *);
 768
 769 typedef struct gaeadkey_pyobj {
 770   PyObject_HEAD
 771   gaead_key *k;
 772 } gaeadkey_pyobj;
 773
 774 #define GAEADKEY_PYCHECK(o) PyObject_TypeCheck((o), gaeadkey_pytype)
 775 #define GAEADKEY_K(o) (((gaeadkey_pyobj *)(o))->k)
 776
 777 typedef struct gcaeadaad_pyobj {
 778   PyHeapTypeObject ty;
 779   gcaead_pyobj *key;
 780 } gcaeadaad_pyobj;
 781
 782 #define GCAEADAAD_KEY(o) (((gcaeadaad_pyobj *)(o))->key)
 783 static PyObject *gaeadaad_pywrap(PyObject *, gaead_aad *, unsigned, size_t);
 784
 785 typedef struct gaeadaad_pyobj {
 786   PyObject_HEAD
 787   gaead_aad *a;
 788   unsigned f;
 789 #define AEADF_DEAD 32768u
 790   size_t hsz, hlen;
 791 } gaeadaad_pyobj;
 792
 793 #define GAEADAAD_PYCHECK(o) PyObject_TypeCheck((o), gaeadaad_pytype)
 794 #define GAEADAAD_A(o) (((gaeadaad_pyobj *)(o))->a)
 795 #define GAEADAAD_F(o) (((gaeadaad_pyobj *)(o))->f)
 796 #define GAEADAAD_HSZ(o) (((gaeadaad_pyobj *)(o))->hsz)
 797 #define GAEADAAD_HLEN(o) (((gaeadaad_pyobj *)(o))->hlen)
 798
 799 typedef struct gcaeadenc_pyobj {
 800   PyHeapTypeObject ty;
 801   gcaead_pyobj *key;
 802 } gcaeadenc_pyobj;
 803
 804 #define GCAEADENC_KEY(o) (((gcaeadenc_pyobj *)(o))->key)
 805 static PyObject *gaeadenc_pywrap(PyObject *, gaead_enc *, unsigned,
 806                                  size_t, size_t, size_t);
 807
 808 typedef struct gaeadenc_pyobj {
 809   PyObject_HEAD
 810   gaead_enc *e;
 811   gaeadaad_pyobj *aad;
 812   unsigned f;
 813   size_t hsz, msz, tsz;
 814   size_t mlen;
 815 } gaeadenc_pyobj;
 816
 817 #define GAEADENC_PYCHECK(o) PyObject_TypeCheck((o), gaeadenc_pytype)
 818 #define GAEADENC_AAD(o) (((gaeadenc_pyobj *)(o))->aad)
 819 #define GAEADENC_E(o) (((gaeadenc_pyobj *)(o))->e)
 820 #define GAEADENC_F(o) (((gaeadenc_pyobj *)(o))->f)
 821 #define GAEADENC_HSZ(o) (((gaeadenc_pyobj *)(o))->hsz)
 822 #define GAEADENC_MSZ(o) (((gaeadenc_pyobj *)(o))->msz)
 823 #define GAEADENC_TSZ(o) (((gaeadenc_pyobj *)(o))->tsz)
 824 #define GAEADENC_MLEN(o) (((gaeadenc_pyobj *)(o))->mlen)
 825
 826 typedef struct gcaeaddec_pyobj {
 827   PyHeapTypeObject ty;
 828   gcaead_pyobj *key;
 829 } gcaeaddec_pyobj;
 830
 831 #define GCAEADDEC_KEY(o) (((gcaeaddec_pyobj *)(o))->key)
 832 static PyObject *gaeaddec_pywrap(PyObject *, gaead_dec *, unsigned,
 833                                  size_t, size_t, size_t);
 834
 835 typedef struct gaeaddec_pyobj {
 836   PyObject_HEAD
 837   gaead_dec *d;
 838   gaeadaad_pyobj *aad;
 839   unsigned f;
 840   size_t hsz, csz, tsz;
 841   size_t clen;
 842 } gaeaddec_pyobj;
 843
 844 #define GAEADDEC_PYCHECK(o) PyObject_TypeCheck((o), gaeaddec_pytype)
 845 #define GAEADDEC_AAD(o) (((gaeaddec_pyobj *)(o))->aad)
 846 #define GAEADDEC_D(o) (((gaeaddec_pyobj *)(o))->d)
 847 #define GAEADDEC_F(o) (((gaeaddec_pyobj *)(o))->f)
 848 #define GAEADDEC_HSZ(o) (((gaeaddec_pyobj *)(o))->hsz)
 849 #define GAEADDEC_CSZ(o) (((gaeaddec_pyobj *)(o))->csz)
 850 #define GAEADDEC_TSZ(o) (((gaeaddec_pyobj *)(o))->tsz)
 851 #define GAEADDEC_CLEN(o) (((gaeaddec_pyobj *)(o))->clen)
 852
 853 static PyObject *gaeadkey_pywrap(PyObject *cobj, gaead_key *k)
 854 {
 855   gaeadkey_pyobj *gk;
 856
 857   if (!cobj) cobj = gcaead_pywrap((/*unconst*/ gcaead *)GAEAD_CLASS(k));
 858   else Py_INCREF(cobj);
 859   gk = PyObject_NEW(gaeadkey_pyobj, (PyTypeObject *)cobj);
 860   gk->k = k;
 861   return ((PyObject *)gk);
 862 }
 863
 864 static PyObject *gaeadkey_pynew(PyTypeObject *ty,
 865                                 PyObject *arg, PyObject *kw)
 866 {
 867   static const char *const kwlist[] = { "k", 0 };
 868   char *k;
 869   Py_ssize_t sz;
 870
 871   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &k, &sz))
 872     goto end;
 873   if (keysz(sz, GCAEAD_AEC(ty)->keysz) != sz) VALERR("bad key length");
 874   return (gaeadkey_pywrap((PyObject *)ty,
 875                           GAEAD_KEY(GCAEAD_AEC(ty), k, sz)));
 876 end:
 877   return (0);
 878 }
 879
 880 static PyObject *gcaead_pywrap(gcaead *aec)
 881 {
 882   gcaead_pyobj *gck;
 883   gcaeadaad_pyobj *gca;
 884   gcaeadenc_pyobj *gce;
 885   gcaeaddec_pyobj *gcd;
 886
 887 #define MKTYPE(obj, thing, newfn, namefmt) do {                         \
 888   (obj) = newtype(gcaead_pytype, 0, 0);                                 \
 889   (obj)->ty.ht_name = PyString_FromFormat(namefmt, aec->name);          \
 890   (obj)->ty.ht_type.tp_name = PyString_AS_STRING((obj)->ty.ht_name);    \
 891   (obj)->ty.ht_type.tp_basicsize = sizeof(gaead##thing##_pyobj);        \
 892   (obj)->ty.ht_type.tp_base = gaead##thing##_pytype;                    \
 893   Py_INCREF(gaead##thing##_pytype);                                     \
 894   (obj)->ty.ht_type.tp_flags =                                          \
 895     (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HEAPTYPE);   \
 896   (obj)->ty.ht_type.tp_alloc = PyType_GenericAlloc;                     \
 897   (obj)->ty.ht_type.tp_free = 0;                                        \
 898   (obj)->ty.ht_type.tp_new = newfn;                                     \
 899   typeready(&(obj)->ty.ht_type);                                        \
 900 } while (0)
 901
 902   MKTYPE(gck, key, gaeadkey_pynew, "%s(key)");
 903   MKTYPE(gca, aad, abstract_pynew, "%s(aad-hash)");
 904   MKTYPE(gce, enc, abstract_pynew, "%s(encrypt)");
 905   MKTYPE(gcd, dec, abstract_pynew, "%s(decrypt)");
 906
 907 #undef MKTYPE
 908
 909   gck->aec = aec; gck->aad = gca; gck->enc = gce; gck->dec = gcd;
 910   gca->key = gce->key = gcd->key = gck;
 911   return ((PyObject *)gck);
 912 }
 913
 914 static void gaeadkey_pydealloc(PyObject *me)
 915   { GAEAD_DESTROY(GAEADKEY_K(me)); Py_DECREF(me->ob_type); FREEOBJ(me); }
 916
 917 static PyObject *gcaeget_name(PyObject *me, void *hunoz)
 918   { return (PyString_FromString(GCAEAD_AEC(me)->name)); }
 919
 920 static PyObject *gcaeget_keysz(PyObject *me, void *hunoz)
 921   { return (keysz_pywrap(GCAEAD_AEC(me)->keysz)); }
 922
 923 static PyObject *gcaeget_noncesz(PyObject *me, void *hunoz)
 924   { return (keysz_pywrap(GCAEAD_AEC(me)->noncesz)); }
 925
 926 static PyObject *gcaeget_tagsz(PyObject *me, void *hunoz)
 927   { return (keysz_pywrap(GCAEAD_AEC(me)->tagsz)); }
 928
 929 static PyObject *gcaeget_blksz(PyObject *me, void *hunoz)
 930   { return (PyInt_FromLong(GCAEAD_AEC(me)->blksz)); }
 931
 932 static PyObject *gcaeget_bufsz(PyObject *me, void *hunoz)
 933   { return (PyInt_FromLong(GCAEAD_AEC(me)->bufsz)); }
 934
 935 static PyObject *gcaeget_ohd(PyObject *me, void *hunoz)
 936   { return (PyInt_FromLong(GCAEAD_AEC(me)->ohd)); }
 937
 938 static PyObject *gcaeget_flags(PyObject *me, void *hunoz)
 939   { return (PyInt_FromLong(GCAEAD_AEC(me)->f)); }
 940
 941 static PyGetSetDef gcaead_pygetset[] = {
 942 #define GETSETNAME(op, name) gcae##op##_##name
 943   GET   (keysz,         "AEC.keysz -> acceptable key sizes")
 944   GET   (noncesz,       "AEC.noncesz -> acceptable nonce sizes")
 945   GET   (tagsz,         "AEC.tagsz -> acceptable tag sizes")
 946   GET   (blksz,         "AEC.blksz -> block size, or zero")
 947   GET   (bufsz,         "AEC.bufsz -> amount of data buffered internally")
 948   GET   (ohd,           "AEC.ohd -> maximum encryption overhead")
 949   GET   (name,          "AEC.name -> name of this kind of AEAD scheme")
 950   GET   (flags,         "AEC.flags -> mask of `AEADF_...' flags")
 951 #undef GETSETNAME
 952   { 0 }
 953 };
 954
 955 static PyObject *gaekmeth_aad(PyObject *me, PyObject *arg)
 956 {
 957   const gaead_key *k = GAEADKEY_K(me);
 958   PyObject *rc = 0;
 959
 960   if (!PyArg_ParseTuple(arg, ":aad")) return (0);
 961   if (k->ops->c->f&AEADF_AADNDEP)
 962     VALERR("aad must be associated with enc/dec op");
 963   rc = gaeadaad_pywrap((PyObject *)GCAEAD_AAD(me->ob_type),
 964                        GAEAD_AAD(k), 0, 0);
 965 end:
 966   return (rc);
 967 }
 968
 969 static int check_aead_encdec(const gcaead *aec, unsigned *f_out, size_t nsz,
 970                              PyObject *hszobj, size_t *hsz_out,
 971                              PyObject *mszobj, size_t *msz_out,
 972                              PyObject *tszobj, size_t *tsz_out)
 973 {
 974   unsigned f = 0, miss;
 975   int rc = -1;
 976
 977   if (hszobj != Py_None)
 978     { f |= AEADF_PCHSZ; if (!convszt(hszobj, hsz_out)) goto end; }
 979   if (mszobj != Py_None)
 980     { f |= AEADF_PCMSZ; if (!convszt(mszobj, msz_out)) goto end; }
 981   if (tszobj != Py_None)
 982     { f |= AEADF_PCTSZ; if (!convszt(tszobj, tsz_out)) goto end; }
 983   miss = aec->f&~f;
 984   if (miss&AEADF_PCHSZ) VALERR("header length precommitment required");
 985   if (miss&AEADF_PCMSZ) VALERR("message length precommitment required");
 986   if (miss&AEADF_PCTSZ) VALERR("tag length precommitment required");
 987   if (keysz(nsz, aec->noncesz) != nsz) VALERR("bad nonce length");
 988   if (tszobj != Py_None && keysz(*tsz_out, aec->tagsz) != *tsz_out)
 989     VALERR("bad tag length");
 990   *f_out = f | aec->f; rc = 0;
 991 end:
 992   return (rc);
 993 }
 994
 995 static PyObject *gaekmeth_enc(PyObject *me, PyObject *arg, PyObject *kw)
 996 {
 997   static const char *const kwlist[] = { "nonce", "hsz", "msz", "tsz", 0 };
 998   const gaead_key *k = GAEADKEY_K(me);
 999   gaead_enc *e;
1000   PyObject *rc = 0;
1001   char *n; Py_ssize_t nsz;
1002   PyObject *hszobj = Py_None, *mszobj = Py_None, *tszobj = Py_None;
1003   size_t hsz = 0, msz = 0, tsz = 0;
1004   unsigned f;
1005
1006   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#|OOO:enc", KWLIST,
1007                                    &n, &nsz, &hszobj, &mszobj, &tszobj))
1008     goto end;
1009   if (check_aead_encdec(k->ops->c, &f, nsz,
1010                         hszobj, &hsz, mszobj, &msz, tszobj, &tsz))
1011     goto end;
1012   e = GAEAD_ENC(GAEADKEY_K(me), n, nsz, hsz, msz, tsz);
1013   if (!e) VALERR("bad aead parameter combination");
1014   rc = gaeadenc_pywrap((PyObject *)GCAEAD_ENC(me->ob_type),
1015                        e, f, hsz, msz, tsz);
1016 end:
1017   return (rc);
1018 }
1019
1020 static PyObject *gaekmeth_dec(PyObject *me, PyObject *arg, PyObject *kw)
1021 {
1022   static const char *const kwlist[] = { "nonce", "hsz", "csz", "tsz", 0 };
1023   const gaead_key *k = GAEADKEY_K(me);
1024   gaead_dec *d;
1025   PyObject *rc = 0;
1026   char *n; Py_ssize_t nsz;
1027   PyObject *hszobj = Py_None, *cszobj = Py_None, *tszobj = Py_None;
1028   size_t hsz = 0, csz = 0, tsz = 0;
1029   unsigned f;
1030
1031   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#|OOO:dec", KWLIST,
1032                                    &n, &nsz, &hszobj, &cszobj, &tszobj))
1033     goto end;
1034   if (check_aead_encdec(k->ops->c, &f, nsz,
1035                         hszobj, &hsz, cszobj, &csz, tszobj, &tsz))
1036     goto end;
1037   d = GAEAD_DEC(GAEADKEY_K(me), n, nsz, hsz, csz, tsz);
1038   if (!d) VALERR("bad aead parameter combination");
1039   rc = gaeaddec_pywrap((PyObject *)GCAEAD_DEC(me->ob_type),
1040                        d, f, hsz, csz, tsz);
1041 end:
1042   return (rc);
1043 }
1044
1045 static PyMethodDef gaeadkey_pymethods[] = {
1046 #define METHNAME(name) gaekmeth_##name
1047   METH  (aad,           "KEY.aad() -> AAD")
1048   KWMETH(enc,           "KEY.enc(NONCE, [hsz], [msz], [tsz]) -> ENC")
1049   KWMETH(dec,           "KEY.dec(NONCE, [hsz], [csz], [tsz]) -> DEC")
1050 #undef METHNAME
1051   { 0 }
1052 };
1053
1054 static PyObject *gaeadaad_pywrap(PyObject *cobj, gaead_aad *a,
1055                                  unsigned f, size_t hsz)
1056 {
1057   gaeadaad_pyobj *ga;
1058
1059   assert(cobj); Py_INCREF(cobj);
1060   ga = PyObject_NEW(gaeadaad_pyobj, (PyTypeObject *)cobj);
1061   ga->a = a; ga->f = f; ga->hsz = hsz; ga->hlen = 0;
1062   return ((PyObject *)ga);
1063 }
1064
1065 static void gaeadaad_pydealloc(PyObject *me)
1066 {
1067   gaeadaad_pyobj *ga = (gaeadaad_pyobj *)me;
1068
1069   if (ga->a) GAEAD_DESTROY(ga->a);
1070   Py_DECREF(me->ob_type); FREEOBJ(me);
1071 }
1072
1073 static int gaea_check(PyObject *me)
1074 {
1075   gaeadaad_pyobj *ga = (gaeadaad_pyobj *)me;
1076   int rc = -1;
1077
1078   if ((ga->f&AEADF_DEAD) || !ga->a) VALERR("aad object no longer active");
1079   rc = 0;
1080 end:
1081   return (rc);
1082 }
1083
1084 static void gaea_invalidate(gaeadaad_pyobj *ga)
1085   { if (ga) ga->f |= AEADF_DEAD; }
1086
1087 static void gaea_sever(gaeadaad_pyobj **ga_inout)
1088 {
1089   gaeadaad_pyobj *ga = *ga_inout;
1090   if (ga) { ga->f |= AEADF_DEAD; ga->a = 0; Py_DECREF(ga); *ga_inout = 0; }
1091 }
1092
1093 static PyObject *gaeaget_hsz(PyObject *me, void *hunoz)
1094 {
1095   if (gaea_check(me)) return (0);
1096   else if (GAEADAAD_F(me)&AEADF_PCHSZ) return getulong(GAEADAAD_HSZ(me));
1097   else RETURN_NONE;
1098 }
1099
1100 static PyObject *gaeaget_hlen(PyObject *me, void *hunoz)
1101   { return (gaea_check(me) ? 0 : getulong(GAEADAAD_HLEN(me))); }
1102
1103 static PyGetSetDef gaeadaad_pygetset[] = {
1104 #define GETSETNAME(op, name) gaea##op##_##name
1105   GET   (hsz,           "AAD.hsz -> precommitted header length or `None'")
1106   GET   (hlen,          "AAD.hlen -> header length so far")
1107 #undef GETSETNAME
1108   { 0 }
1109 };
1110
1111 static PyObject *gaeameth_copy(PyObject *me, PyObject *arg)
1112 {
1113   PyObject *rc = 0;
1114
1115   if (!PyArg_ParseTuple(arg, ":copy")) goto end;
1116   if (gaea_check(me)) goto end;
1117   if (GAEADAAD_F(me)&AEADF_AADNDEP)
1118     VALERR("can't duplicate nonce-dependent aad");
1119   rc = gaeadaad_pywrap((PyObject *)me->ob_type,
1120                        GAEAD_DUP(GAEADAAD_A(me)), 0, 0);
1121   GAEADAAD_HLEN(rc) = GAEADAAD_HLEN(me);
1122 end:
1123   return (rc);
1124 }
1125
1126 static int gaeadaad_hash(PyObject *me, const void *h, size_t hsz)
1127 {
1128   gaeadaad_pyobj *ga = (gaeadaad_pyobj *)me;
1129   int rc = -1;
1130
1131   if (gaea_check(me)) goto end;
1132   if ((ga->f&AEADF_NOAAD) && hsz)
1133     VALERR("header data not permitted");
1134   if ((ga->f&AEADF_PCHSZ) && hsz > ga->hsz - ga->hlen)
1135     VALERR("too large for precommitted header length");
1136   GAEAD_HASH(ga->a, h, hsz); ga->hlen += hsz;
1137   rc = 0;
1138 end:
1139   return (rc);
1140 }
1141
1142
1143 static PyObject *gaeameth_hash(PyObject *me, PyObject *arg)
1144 {
1145   char *h; Py_ssize_t hsz;
1146
1147   if (!PyArg_ParseTuple(arg, "s#:hash", &h, &hsz)) return (0);
1148   if (gaeadaad_hash(me, h, hsz)) return (0);
1149   RETURN_ME;
1150 }
1151
1152 #define GAEAMETH_HASHU_(n, W, w)                                        \
1153   static PyObject *gaeameth_hashu##w(PyObject *me, PyObject *arg)       \
1154   {                                                                     \
1155     uint##n x; octet b[SZ_##W];                                         \
1156     if (!PyArg_ParseTuple(arg, "O&:hashu" #w, convu##n, &x)) return (0); \
1157     STORE##W(b, x); if (gaeadaad_hash(me, b, sizeof(b))) return (0);    \
1158     RETURN_ME;                                                          \
1159   }
1160 DOUINTCONV(GAEAMETH_HASHU_)
1161
1162 #define GAEAMETH_HASHBUF_(n, W, w)                                      \
1163   static PyObject *gaeameth_hashbuf##w(PyObject *me, PyObject *arg)     \
1164   {                                                                     \
1165     char *p; Py_ssize_t sz; octet b[SZ_##W];                            \
1166     if (!PyArg_ParseTuple(arg, "s#:hashbuf" #w, &p, &sz)) goto end;     \
1167     if (sz > MASK##n) TYERR("string too long");                         \
1168     STORE##W(b, sz); if (gaeadaad_hash(me, b, sizeof(b))) goto end;     \
1169     if (gaeadaad_hash(me, p, sz)) goto end;                             \
1170     RETURN_ME;                                                          \
1171   end:                                                                  \
1172     return (0);                                                         \
1173   }
1174 DOUINTCONV(GAEAMETH_HASHBUF_)
1175
1176 static PyObject *gaeameth_hashstrz(PyObject *me, PyObject *arg)
1177 {
1178   char *p;
1179   if (!PyArg_ParseTuple(arg, "s:hashstrz", &p)) return (0);
1180   if (gaeadaad_hash(me, p, strlen(p) + 1)) return (0);
1181   RETURN_ME;
1182 }
1183
1184 static PyMethodDef gaeadaad_pymethods[] = {
1185 #define METHNAME(name) gaeameth_##name
1186   METH  (copy,          "AAD.copy() -> AAD'")
1187   METH  (hash,          "AAD.hash(H)")
1188 #define METHU_(n, W, w) METH(hashu##w, "AAD.hashu" #w "(WORD)")
1189   DOUINTCONV(METHU_)
1190 #undef METHU_
1191 #define METHBUF_(n, W, w) METH(hashbuf##w, "AAD.hashbuf" #w "(BYTES)")
1192   DOUINTCONV(METHBUF_)
1193 #undef METHBUF_
1194   METH  (hashstrz,      "AAD.hashstrz(STRING)")
1195 #undef METHNAME
1196   { 0 }
1197 };
1198
1199 static PyObject *gaeadenc_pywrap(PyObject *cobj, gaead_enc *e, unsigned f,
1200                                  size_t hsz, size_t msz, size_t tsz)
1201 {
1202   gaeadenc_pyobj *ge;
1203
1204   assert(cobj); Py_INCREF(cobj);
1205   ge = PyObject_NEW(gaeadenc_pyobj, (PyTypeObject *)cobj);
1206   ge->e = e; ge->f = f; ge->hsz = hsz; ge->msz = msz; ge->tsz = tsz;
1207   ge->aad = 0; ge->mlen = 0;
1208   return ((PyObject *)ge);
1209 }
1210
1211 static void gaeadenc_pydealloc(PyObject *me)
1212 {
1213   gaeadenc_pyobj *ge = (gaeadenc_pyobj *)me;
1214
1215   gaea_sever(&ge->aad); GAEAD_DESTROY(ge->e);
1216   Py_DECREF(me->ob_type); FREEOBJ(me);
1217 }
1218
1219 static PyObject *gaeeget_hsz(PyObject *me, void *hunoz)
1220 {
1221   if (GAEADENC_F(me)&AEADF_PCHSZ) return getulong(GAEADENC_HSZ(me));
1222   else RETURN_NONE;
1223 }
1224
1225 static PyObject *gaeeget_msz(PyObject *me, void *hunoz)
1226 {
1227   if (GAEADENC_F(me)&AEADF_PCMSZ) return getulong(GAEADENC_MSZ(me));
1228   else RETURN_NONE;
1229 }
1230
1231 static PyObject *gaeeget_tsz(PyObject *me, void *hunoz)
1232 {
1233   if (GAEADENC_F(me)&AEADF_PCTSZ) return getulong(GAEADENC_TSZ(me));
1234   else RETURN_NONE;
1235 }
1236
1237 static PyObject *gaeeget_mlen(PyObject *me, void *hunoz)
1238   { return getulong(GAEADENC_MLEN(me)); }
1239
1240 static PyGetSetDef gaeadenc_pygetset[] = {
1241 #define GETSETNAME(op, name) gaee##op##_##name
1242   GET   (hsz,           "ENC.hsz -> precommitted header length or `None'")
1243   GET   (msz,           "ENC.msz -> precommitted message length or `None'")
1244   GET   (tsz,           "ENC.tsz -> precommitted tag length or `None'")
1245   GET   (mlen,          "ENC.mlen -> message length so far")
1246 #undef GETSETNAME
1247   { 0 }
1248 };
1249
1250 static PyObject *gaeemeth_aad(PyObject *me, PyObject *arg)
1251 {
1252   gaeadenc_pyobj *ge = (gaeadenc_pyobj *)me;
1253   PyObject *rc = 0;
1254
1255   if (!PyArg_ParseTuple(arg, ":aad")) return (0);
1256   if (!(ge->f&AEADF_AADNDEP))
1257     rc = gaeadaad_pywrap((PyObject *)GCAEADENC_KEY(ge->ob_type)->aad,
1258                          GAEAD_AAD(ge->e), 0, 0);
1259   else {
1260     if ((ge->f&AEADF_AADFIRST) && ge->mlen)
1261       VALERR("too late for aad");
1262     if (!ge->aad)
1263       ge->aad = (gaeadaad_pyobj *)
1264         gaeadaad_pywrap((PyObject *)GCAEADENC_KEY(ge->ob_type)->aad,
1265                         GAEAD_AAD(ge->e), ge->f&(AEADF_PCHSZ | AEADF_NOAAD),
1266                         ge->hsz);
1267     Py_INCREF(ge->aad);
1268     rc = (PyObject *)ge->aad;
1269   }
1270 end:
1271   return (rc);
1272 }
1273
1274 static PyObject *gaeemeth_reinit(PyObject *me, PyObject *arg, PyObject *kw)
1275 {
1276   static const char *const kwlist[] = { "nonce", "hsz", "msz", "tsz", 0 };
1277   gaeadenc_pyobj *ge = (gaeadenc_pyobj *)me;
1278   char *n; Py_ssize_t nsz;
1279   PyObject *hszobj = Py_None, *mszobj = Py_None, *tszobj = Py_None;
1280   size_t hsz = 0, msz = 0, tsz = 0;
1281   unsigned f;
1282
1283   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#|OOO:enc", KWLIST,
1284                                    &n, &nsz, &hszobj, &mszobj, &tszobj))
1285     goto end;
1286   if (check_aead_encdec(ge->e->ops->c, &f, nsz,
1287                         hszobj, &hsz, mszobj, &msz, tszobj, &tsz))
1288     goto end;
1289   if (GAEAD_REINIT(ge->e, n, nsz, hsz, msz, tsz))
1290     VALERR("bad aead parameter combination");
1291   gaea_sever(&ge->aad);
1292   ge->f = f; ge->hsz = hsz; ge->msz = msz; ge->tsz = tsz;
1293 end:
1294   return (0);
1295 }
1296
1297 static PyObject *gaeemeth_encrypt(PyObject *me, PyObject *arg)
1298 {
1299   gaeadenc_pyobj *ge = (gaeadenc_pyobj *)me;
1300   char *m; Py_ssize_t msz;
1301   char *c = 0; size_t csz; buf b;
1302   int err;
1303   PyObject *rc = 0;
1304
1305   if (!PyArg_ParseTuple(arg, "s#:encrypt", &m, &msz)) goto end;
1306   if (ge->f&AEADF_AADFIRST) {
1307     if ((ge->f&AEADF_PCHSZ) && (ge->aad ? ge->aad->hlen : 0) != ge->hsz)
1308       VALERR("header doesn't match precommitted length");
1309     gaea_invalidate(ge->aad);
1310   }
1311   if ((ge->f&AEADF_PCMSZ) && msz > ge->msz - ge->mlen)
1312     VALERR("too large for precommitted message length");
1313   csz = msz + ge->e->ops->c->bufsz; c = xmalloc(csz); buf_init(&b, c, csz);
1314   err = GAEAD_ENCRYPT(ge->e, m, msz, &b); assert(!err); (void)err;
1315   buf_flip(&b); rc = bytestring_pywrapbuf(&b); ge->mlen += msz;
1316 end:
1317   xfree(c);
1318   return (rc);
1319 }
1320
1321 static PyObject *gaeemeth_done(PyObject *me, PyObject *arg, PyObject *kw)
1322 {
1323   static const char *const kwlist[] = { "tsz", "aad", 0 };
1324   gaeadenc_pyobj *ge = (gaeadenc_pyobj *)me;
1325   PyObject *aad = Py_None;
1326   char *c = 0; size_t csz; buf b;
1327   PyObject *tszobj = Py_None; PyObject *tag; size_t tsz;
1328   int err;
1329   PyObject *rc = 0;
1330
1331   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OO:done", KWLIST,
1332                                    &tszobj, &aad))
1333     goto end;
1334   if (tszobj != Py_None && !convszt(tszobj, &tsz)) goto end;
1335   if (aad != Py_None &&
1336       !PyObject_TypeCheck(aad,
1337                           (PyTypeObject *)GCAEADENC_KEY(me->ob_type)->aad))
1338     TYERR("wanted aad");
1339   if ((ge->f&AEADF_AADNDEP) && aad != Py_None && aad != (PyObject *)ge->aad)
1340     VALERR("mismatched aad");
1341   if ((ge->f&AEADF_PCHSZ) &&
1342       (aad == Py_None ? 0 : GAEADAAD_HLEN(aad)) != ge->hsz)
1343     VALERR("header doesn't match precommitted length");
1344   if ((ge->f&AEADF_PCMSZ) && ge->mlen != ge->msz)
1345     VALERR("message doesn't match precommitted length");
1346   if (tszobj == Py_None) {
1347     if (ge->f&AEADF_PCTSZ) tsz = ge->tsz;
1348     else tsz = keysz(0, ge->e->ops->c->tagsz);
1349   } else {
1350     if ((ge->f&AEADF_PCTSZ) && tsz != ge->tsz)
1351       VALERR("tag length doesn't match precommitted value");
1352     if (keysz(tsz, ge->e->ops->c->tagsz) != tsz) VALERR("bad tag length");
1353   }
1354   csz = ge->e->ops->c->bufsz; c = xmalloc(csz); buf_init(&b, c, csz);
1355   tag = bytestring_pywrap(0, tsz);
1356   err = GAEAD_DONE(ge->e, aad == Py_None ? 0 : GAEADAAD_A(aad), &b,
1357                    PyString_AS_STRING(tag), tsz);
1358   assert(!err); (void)err;
1359   buf_flip(&b); rc = Py_BuildValue("NN", bytestring_pywrapbuf(&b), tag);
1360 end:
1361   xfree(c);
1362   return (rc);
1363 }
1364
1365 static PyMethodDef gaeadenc_pymethods[] = {
1366 #define METHNAME(name) gaeemeth_##name
1367   METH  (aad,           "ENC.aad() -> AAD")
1368   KWMETH(reinit,        "ENC.reinit(NONCE, [hsz], [msz], [tsz])")
1369   METH  (encrypt,       "ENC.encrypt(MSG) -> CT")
1370   KWMETH(done,          "ENC.done([tsz], [aad]) -> CT, TAG")
1371 #undef METHNAME
1372   { 0 }
1373 };
1374
1375 static PyObject *gaeaddec_pywrap(PyObject *cobj, gaead_dec *d, unsigned f,
1376                                  size_t hsz, size_t csz, size_t tsz)
1377 {
1378   gaeaddec_pyobj *gd;
1379   assert(cobj); Py_INCREF(cobj);
1380   gd = PyObject_NEW(gaeaddec_pyobj, (PyTypeObject *)cobj);
1381   gd->d = d; gd->f = f; gd->hsz = hsz; gd->csz = csz; gd->tsz = tsz;
1382   gd->aad = 0; gd->clen = 0;
1383   return ((PyObject *)gd);
1384 }
1385
1386 static void gaeaddec_pydealloc(PyObject *me)
1387 {
1388   gaeaddec_pyobj *gd = (gaeaddec_pyobj *)me;
1389
1390   gaea_sever(&gd->aad); GAEAD_DESTROY(GAEADDEC_D(me));
1391   Py_DECREF(me->ob_type); FREEOBJ(me);
1392 }
1393
1394 static PyObject *gaedget_hsz(PyObject *me, void *hunoz)
1395 {
1396   if (GAEADDEC_F(me)&AEADF_PCHSZ) return getulong(GAEADDEC_HSZ(me));
1397   else RETURN_NONE;
1398 }
1399
1400 static PyObject *gaedget_csz(PyObject *me, void *hunoz)
1401 {
1402   if (GAEADDEC_F(me)&AEADF_PCMSZ) return getulong(GAEADDEC_CSZ(me));
1403   else RETURN_NONE;
1404 }
1405
1406 static PyObject *gaedget_tsz(PyObject *me, void *hunoz)
1407 {
1408   if (GAEADDEC_F(me)&AEADF_PCTSZ) return getulong(GAEADDEC_TSZ(me));
1409   else RETURN_NONE;
1410 }
1411
1412 static PyObject *gaedget_clen(PyObject *me, void *hunoz)
1413   { return getulong(GAEADDEC_CLEN(me)); }
1414
1415 static PyGetSetDef gaeaddec_pygetset[] = {
1416 #define GETSETNAME(op, name) gaed##op##_##name
1417   GET   (hsz,           "DEC.hsz -> precommitted header length or `None'")
1418   GET   (csz,          "DEC.csz -> precommitted ciphertext length or `None'")
1419   GET   (tsz,           "DEC.tsz -> precommitted tag length or `None'")
1420   GET   (clen,          "DEC.clen -> ciphertext length so far")
1421 #undef GETSETNAME
1422   { 0 }
1423 };
1424
1425 static PyObject *gaedmeth_aad(PyObject *me, PyObject *arg)
1426 {
1427   gaeaddec_pyobj *gd = (gaeaddec_pyobj *)me;
1428
1429   if (!PyArg_ParseTuple(arg, ":aad")) return (0);
1430   if (!(gd->f&AEADF_AADNDEP))
1431     return (gaeadaad_pywrap((PyObject *)GCAEADDEC_KEY(gd->ob_type)->aad,
1432                             GAEAD_AAD(gd->d), 0, 0));
1433   else {
1434     if (!gd->aad)
1435       gd->aad = (gaeadaad_pyobj *)
1436         gaeadaad_pywrap((PyObject *)GCAEADENC_KEY(gd->ob_type)->aad,
1437                         GAEAD_AAD(gd->d), gd->f&(AEADF_PCHSZ | AEADF_NOAAD),
1438                         gd->hsz);
1439     Py_INCREF(gd->aad);
1440     return ((PyObject *)gd->aad);
1441   }
1442 }
1443
1444 static PyObject *gaedmeth_reinit(PyObject *me, PyObject *arg, PyObject *kw)
1445 {
1446   static const char *const kwlist[] = { "nonce", "hsz", "csz", "tsz", 0 };
1447   gaeaddec_pyobj *gd = (gaeaddec_pyobj *)me;
1448   char *n; Py_ssize_t nsz;
1449   PyObject *hszobj = Py_None, *cszobj = Py_None, *tszobj = Py_None;
1450   size_t hsz = 0, csz = 0, tsz = 0;
1451   unsigned f;
1452
1453   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#|OOO:enc", KWLIST,
1454                                    &n, &nsz, &hszobj, &cszobj, &tszobj))
1455     goto end;
1456   if (check_aead_encdec(gd->d->ops->c, &f, nsz,
1457                         hszobj, &hsz, cszobj, &csz, tszobj, &tsz))
1458     goto end;
1459   if (GAEAD_REINIT(gd->d, n, nsz, hsz, csz, tsz))
1460     VALERR("bad aead parameter combination");
1461   gaea_sever(&gd->aad);
1462   gd->f = f; gd->hsz = hsz; gd->csz = csz; gd->tsz = tsz;
1463 end:
1464   return (0);
1465 }
1466
1467 static PyObject *gaedmeth_decrypt(PyObject *me, PyObject *arg)
1468 {
1469   gaeaddec_pyobj *gd = (gaeaddec_pyobj *)me;
1470   char *c; Py_ssize_t csz;
1471   char *m = 0; size_t msz; buf b;
1472   int err;
1473   PyObject *rc = 0;
1474
1475   if (!PyArg_ParseTuple(arg, "s#:decrypt", &c, &csz)) goto end;
1476   if (gd->f&AEADF_AADFIRST) {
1477     if ((gd->f&AEADF_PCHSZ) && (gd->aad ? gd->aad->hlen : 0) != gd->hsz)
1478       VALERR("header doesn't match precommitted length");
1479     gaea_invalidate(gd->aad);
1480   }
1481   if ((gd->f&AEADF_PCMSZ) && csz > gd->csz - gd->clen)
1482     VALERR("too large for precommitted message length");
1483   msz = csz + gd->d->ops->c->bufsz; m = xmalloc(msz); buf_init(&b, m, msz);
1484   err = GAEAD_DECRYPT(gd->d, c, csz, &b); assert(!err); (void)err;
1485   buf_flip(&b); rc = bytestring_pywrapbuf(&b); gd->clen += csz;
1486 end:
1487   xfree(m);
1488   return (rc);
1489 }
1490
1491 static PyObject *gaedmeth_done(PyObject *me, PyObject *arg, PyObject *kw)
1492 {
1493   static const char *const kwlist[] = { "tag", "aad", 0 };
1494   gaeaddec_pyobj *gd = (gaeaddec_pyobj *)me;
1495   PyObject *aad = Py_None;
1496   char *t; Py_ssize_t tsz;
1497   char *m = 0; size_t msz; buf b;
1498   int err;
1499   PyObject *rc = 0;
1500
1501   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#|O:done", KWLIST,
1502                                    &t, &tsz, &aad))
1503     goto end;
1504   if (aad != Py_None &&
1505       !PyObject_TypeCheck(aad,
1506                           (PyTypeObject *)GCAEADENC_KEY(me->ob_type)->aad))
1507     TYERR("wanted aad");
1508   if ((gd->f&AEADF_AADNDEP) && aad != Py_None && aad != (PyObject *)gd->aad)
1509     VALERR("mismatched aad");
1510   if ((gd->f&AEADF_PCHSZ) &&
1511       (aad == Py_None ? 0 : GAEADAAD_HLEN(aad)) != gd->hsz)
1512     VALERR("header doesn't match precommitted length");
1513   if ((gd->f&AEADF_PCMSZ) && gd->clen != gd->csz)
1514     VALERR("message doesn't match precommitted length");
1515   if ((gd->f&AEADF_PCTSZ) && tsz != gd->tsz)
1516     VALERR("tag length doesn't match precommitted value");
1517   if (keysz(tsz, gd->d->ops->c->tagsz) != tsz) VALERR("bad tag length");
1518   msz = gd->d->ops->c->bufsz; m = xmalloc(msz); buf_init(&b, m, msz);
1519   err = GAEAD_DONE(gd->d, aad == Py_None ? 0 : GAEADAAD_A(aad), &b, t, tsz);
1520   assert(err >= 0);
1521   if (!err) VALERR("decryption failed");
1522   buf_flip(&b); rc = bytestring_pywrapbuf(&b);
1523 end:
1524   xfree(m);
1525   return (rc);
1526 }
1527
1528 static PyMethodDef gaeaddec_pymethods[] = {
1529 #define METHNAME(name) gaedmeth_##name
1530   METH  (aad,           "DEC.aad() -> AAD")
1531   KWMETH(reinit,        "DEC.reinit(NONCE, [hsz], [csz], [tsz])")
1532   METH  (decrypt,       "DEC.decrypt(CT) -> MSG")
1533   KWMETH(done,          "DEC.done(TAG, [aad]) -> MSG | None")
1534 #undef METHNAME
1535   { 0 }
1536 };
1537
1538 static PyTypeObject gcaead_pytype_skel = {
1539   PyObject_HEAD_INIT(0) 0,              /* Header */
1540   "GCAEAD",                             /* @tp_name@ */
1541   sizeof(gcaead_pyobj),                 /* @tp_basicsize@ */
1542   0,                                    /* @tp_itemsize@ */
1543
1544   0,                                    /* @tp_dealloc@ */
1545   0,                                    /* @tp_print@ */
1546   0,                                    /* @tp_getattr@ */
1547   0,                                    /* @tp_setattr@ */
1548   0,                                    /* @tp_compare@ */
1549   0,                                    /* @tp_repr@ */
1550   0,                                    /* @tp_as_number@ */
1551   0,                                    /* @tp_as_sequence@ */
1552   0,                                    /* @tp_as_mapping@ */
1553   0,                                    /* @tp_hash@ */
1554   0,                                    /* @tp_call@ */
1555   0,                                    /* @tp_str@ */
1556   0,                                    /* @tp_getattro@ */
1557   0,                                    /* @tp_setattro@ */
1558   0,                                    /* @tp_as_buffer@ */
1559   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1560     Py_TPFLAGS_BASETYPE,
1561
1562   /* @tp_doc@ */
1563   "Authenticated encryption (key) metaclass.",
1564
1565   0,                                    /* @tp_traverse@ */
1566   0,                                    /* @tp_clear@ */
1567   0,                                    /* @tp_richcompare@ */
1568   0,                                    /* @tp_weaklistoffset@ */
1569   0,                                    /* @tp_iter@ */
1570   0,                                    /* @tp_iternext@ */
1571   0,                                    /* @tp_methods@ */
1572   0,                                    /* @tp_members@ */
1573   gcaead_pygetset,                      /* @tp_getset@ */
1574   0,                                    /* @tp_base@ */
1575   0,                                    /* @tp_dict@ */
1576   0,                                    /* @tp_descr_get@ */
1577   0,                                    /* @tp_descr_set@ */
1578   0,                                    /* @tp_dictoffset@ */
1579   0,                                    /* @tp_init@ */
1580   PyType_GenericAlloc,                  /* @tp_alloc@ */
1581   abstract_pynew,                       /* @tp_new@ */
1582   0,                                    /* @tp_free@ */
1583   0                                     /* @tp_is_gc@ */
1584 };
1585
1586 static PyTypeObject gaeadkey_pytype_skel = {
1587   PyObject_HEAD_INIT(0) 0,              /* Header */
1588   "GAEKey",                             /* @tp_name@ */
1589   sizeof(gaeadkey_pyobj),               /* @tp_basicsize@ */
1590   0,                                    /* @tp_itemsize@ */
1591
1592   gaeadkey_pydealloc,                   /* @tp_dealloc@ */
1593   0,                                    /* @tp_print@ */
1594   0,                                    /* @tp_getattr@ */
1595   0,                                    /* @tp_setattr@ */
1596   0,                                    /* @tp_compare@ */
1597   0,                                    /* @tp_repr@ */
1598   0,                                    /* @tp_as_number@ */
1599   0,                                    /* @tp_as_sequence@ */
1600   0,                                    /* @tp_as_mapping@ */
1601   0,                                    /* @tp_hash@ */
1602   0,                                    /* @tp_call@ */
1603   0,                                    /* @tp_str@ */
1604   0,                                    /* @tp_getattro@ */
1605   0,                                    /* @tp_setattro@ */
1606   0,                                    /* @tp_as_buffer@ */
1607   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1608     Py_TPFLAGS_BASETYPE,
1609
1610   /* @tp_doc@ */
1611   "Authenticated encryption key.",
1612
1613   0,                                    /* @tp_traverse@ */
1614   0,                                    /* @tp_clear@ */
1615   0,                                    /* @tp_richcompare@ */
1616   0,                                    /* @tp_weaklistoffset@ */
1617   0,                                    /* @tp_iter@ */
1618   0,                                    /* @tp_iternext@ */
1619   gaeadkey_pymethods,                   /* @tp_methods@ */
1620   0,                                    /* @tp_members@ */
1621   0,                                    /* @tp_getset@ */
1622   0,                                    /* @tp_base@ */
1623   0,                                    /* @tp_dict@ */
1624   0,                                    /* @tp_descr_get@ */
1625   0,                                    /* @tp_descr_set@ */
1626   0,                                    /* @tp_dictoffset@ */
1627   0,                                    /* @tp_init@ */
1628   PyType_GenericAlloc,                  /* @tp_alloc@ */
1629   abstract_pynew,                       /* @tp_new@ */
1630   0,                                    /* @tp_free@ */
1631   0                                     /* @tp_is_gc@ */
1632 };
1633
1634 static PyTypeObject gcaeadaad_pytype_skel = {
1635   PyObject_HEAD_INIT(0) 0,              /* Header */
1636   "GAEAADClass",                        /* @tp_name@ */
1637   sizeof(gcaeadaad_pyobj),              /* @tp_basicsize@ */
1638   0,                                    /* @tp_itemsize@ */
1639
1640   0,                                    /* @tp_dealloc@ */
1641   0,                                    /* @tp_print@ */
1642   0,                                    /* @tp_getattr@ */
1643   0,                                    /* @tp_setattr@ */
1644   0,                                    /* @tp_compare@ */
1645   0,                                    /* @tp_repr@ */
1646   0,                                    /* @tp_as_number@ */
1647   0,                                    /* @tp_as_sequence@ */
1648   0,                                    /* @tp_as_mapping@ */
1649   0,                                    /* @tp_hash@ */
1650   0,                                    /* @tp_call@ */
1651   0,                                    /* @tp_str@ */
1652   0,                                    /* @tp_getattro@ */
1653   0,                                    /* @tp_setattro@ */
1654   0,                                    /* @tp_as_buffer@ */
1655   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1656     Py_TPFLAGS_BASETYPE,
1657
1658   /* @tp_doc@ */
1659   "Authenticated encryption additional-data hash metaclass.",
1660
1661   0,                                    /* @tp_traverse@ */
1662   0,                                    /* @tp_clear@ */
1663   0,                                    /* @tp_richcompare@ */
1664   0,                                    /* @tp_weaklistoffset@ */
1665   0,                                    /* @tp_iter@ */
1666   0,                                    /* @tp_iternext@ */
1667   0,                                    /* @tp_methods@ */
1668   0,                                    /* @tp_members@ */
1669   0,                                    /* @tp_getset@ */
1670   0,                                    /* @tp_base@ */
1671   0,                                    /* @tp_dict@ */
1672   0,                                    /* @tp_descr_get@ */
1673   0,                                    /* @tp_descr_set@ */
1674   0,                                    /* @tp_dictoffset@ */
1675   0,                                    /* @tp_init@ */
1676   PyType_GenericAlloc,                  /* @tp_alloc@ */
1677   abstract_pynew,                       /* @tp_new@ */
1678   0,                                    /* @tp_free@ */
1679   0                                     /* @tp_is_gc@ */
1680 };
1681
1682 static PyTypeObject gaeadaad_pytype_skel = {
1683   PyObject_HEAD_INIT(0) 0,              /* Header */
1684   "GAEAAD",                             /* @tp_name@ */
1685   sizeof(gaeadaad_pyobj),               /* @tp_basicsize@ */
1686   0,                                    /* @tp_itemsize@ */
1687
1688   gaeadaad_pydealloc,                   /* @tp_dealloc@ */
1689   0,                                    /* @tp_print@ */
1690   0,                                    /* @tp_getattr@ */
1691   0,                                    /* @tp_setattr@ */
1692   0,                                    /* @tp_compare@ */
1693   0,                                    /* @tp_repr@ */
1694   0,                                    /* @tp_as_number@ */
1695   0,                                    /* @tp_as_sequence@ */
1696   0,                                    /* @tp_as_mapping@ */
1697   0,                                    /* @tp_hash@ */
1698   0,                                    /* @tp_call@ */
1699   0,                                    /* @tp_str@ */
1700   0,                                    /* @tp_getattro@ */
1701   0,                                    /* @tp_setattro@ */
1702   0,                                    /* @tp_as_buffer@ */
1703   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1704     Py_TPFLAGS_BASETYPE,
1705
1706   /* @tp_doc@ */
1707   "Authenticated encryption AAD hash.",
1708
1709   0,                                    /* @tp_traverse@ */
1710   0,                                    /* @tp_clear@ */
1711   0,                                    /* @tp_richcompare@ */
1712   0,                                    /* @tp_weaklistoffset@ */
1713   0,                                    /* @tp_iter@ */
1714   0,                                    /* @tp_iternext@ */
1715   gaeadaad_pymethods,                   /* @tp_methods@ */
1716   0,                                    /* @tp_members@ */
1717   gaeadaad_pygetset,                    /* @tp_getset@ */
1718   0,                                    /* @tp_base@ */
1719   0,                                    /* @tp_dict@ */
1720   0,                                    /* @tp_descr_get@ */
1721   0,                                    /* @tp_descr_set@ */
1722   0,                                    /* @tp_dictoffset@ */
1723   0,                                    /* @tp_init@ */
1724   PyType_GenericAlloc,                  /* @tp_alloc@ */
1725   abstract_pynew,                       /* @tp_new@ */
1726   0,                                    /* @tp_free@ */
1727   0                                     /* @tp_is_gc@ */
1728 };
1729
1730 static PyTypeObject gcaeadenc_pytype_skel = {
1731   PyObject_HEAD_INIT(0) 0,              /* Header */
1732   "GAEEncClass",                        /* @tp_name@ */
1733   sizeof(gcaeadenc_pyobj),              /* @tp_basicsize@ */
1734   0,                                    /* @tp_itemsize@ */
1735
1736   0,                                    /* @tp_dealloc@ */
1737   0,                                    /* @tp_print@ */
1738   0,                                    /* @tp_getattr@ */
1739   0,                                    /* @tp_setattr@ */
1740   0,                                    /* @tp_compare@ */
1741   0,                                    /* @tp_repr@ */
1742   0,                                    /* @tp_as_number@ */
1743   0,                                    /* @tp_as_sequence@ */
1744   0,                                    /* @tp_as_mapping@ */
1745   0,                                    /* @tp_hash@ */
1746   0,                                    /* @tp_call@ */
1747   0,                                    /* @tp_str@ */
1748   0,                                    /* @tp_getattro@ */
1749   0,                                    /* @tp_setattro@ */
1750   0,                                    /* @tp_as_buffer@ */
1751   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1752     Py_TPFLAGS_BASETYPE,
1753
1754   /* @tp_doc@ */
1755   "Authenticated encryption operation metaclass.",
1756
1757   0,                                    /* @tp_traverse@ */
1758   0,                                    /* @tp_clear@ */
1759   0,                                    /* @tp_richcompare@ */
1760   0,                                    /* @tp_weaklistoffset@ */
1761   0,                                    /* @tp_iter@ */
1762   0,                                    /* @tp_iternext@ */
1763   0,                                    /* @tp_methods@ */
1764   0,                                    /* @tp_members@ */
1765   0,                                    /* @tp_getset@ */
1766   0,                                    /* @tp_base@ */
1767   0,                                    /* @tp_dict@ */
1768   0,                                    /* @tp_descr_get@ */
1769   0,                                    /* @tp_descr_set@ */
1770   0,                                    /* @tp_dictoffset@ */
1771   0,                                    /* @tp_init@ */
1772   PyType_GenericAlloc,                  /* @tp_alloc@ */
1773   abstract_pynew,                       /* @tp_new@ */
1774   0,                                    /* @tp_free@ */
1775   0                                     /* @tp_is_gc@ */
1776 };
1777
1778 static PyTypeObject gaeadenc_pytype_skel = {
1779   PyObject_HEAD_INIT(0) 0,              /* Header */
1780   "GAEEnc",                             /* @tp_name@ */
1781   sizeof(gaeadenc_pyobj),               /* @tp_basicsize@ */
1782   0,                                    /* @tp_itemsize@ */
1783
1784   gaeadenc_pydealloc,                   /* @tp_dealloc@ */
1785   0,                                    /* @tp_print@ */
1786   0,                                    /* @tp_getattr@ */
1787   0,                                    /* @tp_setattr@ */
1788   0,                                    /* @tp_compare@ */
1789   0,                                    /* @tp_repr@ */
1790   0,                                    /* @tp_as_number@ */
1791   0,                                    /* @tp_as_sequence@ */
1792   0,                                    /* @tp_as_mapping@ */
1793   0,                                    /* @tp_hash@ */
1794   0,                                    /* @tp_call@ */
1795   0,                                    /* @tp_str@ */
1796   0,                                    /* @tp_getattro@ */
1797   0,                                    /* @tp_setattro@ */
1798   0,                                    /* @tp_as_buffer@ */
1799   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1800     Py_TPFLAGS_BASETYPE,
1801
1802   /* @tp_doc@ */
1803   "Authenticated encryption operation.",
1804
1805   0,                                    /* @tp_traverse@ */
1806   0,                                    /* @tp_clear@ */
1807   0,                                    /* @tp_richcompare@ */
1808   0,                                    /* @tp_weaklistoffset@ */
1809   0,                                    /* @tp_iter@ */
1810   0,                                    /* @tp_iternext@ */
1811   gaeadenc_pymethods,                   /* @tp_methods@ */
1812   0,                                    /* @tp_members@ */
1813   gaeadenc_pygetset,                    /* @tp_getset@ */
1814   0,                                    /* @tp_base@ */
1815   0,                                    /* @tp_dict@ */
1816   0,                                    /* @tp_descr_get@ */
1817   0,                                    /* @tp_descr_set@ */
1818   0,                                    /* @tp_dictoffset@ */
1819   0,                                    /* @tp_init@ */
1820   PyType_GenericAlloc,                  /* @tp_alloc@ */
1821   abstract_pynew,                       /* @tp_new@ */
1822   0,                                    /* @tp_free@ */
1823   0                                     /* @tp_is_gc@ */
1824 };
1825
1826 static PyTypeObject gcaeaddec_pytype_skel = {
1827   PyObject_HEAD_INIT(0) 0,              /* Header */
1828   "GAEDecClass",                        /* @tp_name@ */
1829   sizeof(gcaeaddec_pyobj),              /* @tp_basicsize@ */
1830   0,                                    /* @tp_itemsize@ */
1831
1832   0,                                    /* @tp_dealloc@ */
1833   0,                                    /* @tp_print@ */
1834   0,                                    /* @tp_getattr@ */
1835   0,                                    /* @tp_setattr@ */
1836   0,                                    /* @tp_compare@ */
1837   0,                                    /* @tp_repr@ */
1838   0,                                    /* @tp_as_number@ */
1839   0,                                    /* @tp_as_sequence@ */
1840   0,                                    /* @tp_as_mapping@ */
1841   0,                                    /* @tp_hash@ */
1842   0,                                    /* @tp_call@ */
1843   0,                                    /* @tp_str@ */
1844   0,                                    /* @tp_getattro@ */
1845   0,                                    /* @tp_setattro@ */
1846   0,                                    /* @tp_as_buffer@ */
1847   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1848     Py_TPFLAGS_BASETYPE,
1849
1850   /* @tp_doc@ */
1851   "Authenticated decryption operation metaclass.",
1852
1853   0,                                    /* @tp_traverse@ */
1854   0,                                    /* @tp_clear@ */
1855   0,                                    /* @tp_richcompare@ */
1856   0,                                    /* @tp_weaklistoffset@ */
1857   0,                                    /* @tp_iter@ */
1858   0,                                    /* @tp_iternext@ */
1859   0,                                    /* @tp_methods@ */
1860   0,                                    /* @tp_members@ */
1861   0,                                    /* @tp_getset@ */
1862   0,                                    /* @tp_base@ */
1863   0,                                    /* @tp_dict@ */
1864   0,                                    /* @tp_descr_get@ */
1865   0,                                    /* @tp_descr_set@ */
1866   0,                                    /* @tp_dictoffset@ */
1867   0,                                    /* @tp_init@ */
1868   PyType_GenericAlloc,                  /* @tp_alloc@ */
1869   abstract_pynew,                       /* @tp_new@ */
1870   0,                                    /* @tp_free@ */
1871   0                                     /* @tp_is_gc@ */
1872 };
1873
1874 static PyTypeObject gaeaddec_pytype_skel = {
1875   PyObject_HEAD_INIT(0) 0,              /* Header */
1876   "GAEDec",                             /* @tp_name@ */
1877   sizeof(gaeaddec_pyobj),               /* @tp_basicsize@ */
1878   0,                                    /* @tp_itemsize@ */
1879
1880   gaeaddec_pydealloc,                   /* @tp_dealloc@ */
1881   0,                                    /* @tp_print@ */
1882   0,                                    /* @tp_getattr@ */
1883   0,                                    /* @tp_setattr@ */
1884   0,                                    /* @tp_compare@ */
1885   0,                                    /* @tp_repr@ */
1886   0,                                    /* @tp_as_number@ */
1887   0,                                    /* @tp_as_sequence@ */
1888   0,                                    /* @tp_as_mapping@ */
1889   0,                                    /* @tp_hash@ */
1890   0,                                    /* @tp_call@ */
1891   0,                                    /* @tp_str@ */
1892   0,                                    /* @tp_getattro@ */
1893   0,                                    /* @tp_setattro@ */
1894   0,                                    /* @tp_as_buffer@ */
1895   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1896     Py_TPFLAGS_BASETYPE,
1897
1898   /* @tp_doc@ */
1899   "Authenticated decryption operation.",
1900
1901   0,                                    /* @tp_traverse@ */
1902   0,                                    /* @tp_clear@ */
1903   0,                                    /* @tp_richcompare@ */
1904   0,                                    /* @tp_weaklistoffset@ */
1905   0,                                    /* @tp_iter@ */
1906   0,                                    /* @tp_iternext@ */
1907   gaeaddec_pymethods,                   /* @tp_methods@ */
1908   0,                                    /* @tp_members@ */
1909   gaeaddec_pygetset,                    /* @tp_getset@ */
1910   0,                                    /* @tp_base@ */
1911   0,                                    /* @tp_dict@ */
1912   0,                                    /* @tp_descr_get@ */
1913   0,                                    /* @tp_descr_set@ */
1914   0,                                    /* @tp_dictoffset@ */
1915   0,                                    /* @tp_init@ */
1916   PyType_GenericAlloc,                  /* @tp_alloc@ */
1917   abstract_pynew,                       /* @tp_new@ */
1918   0,                                    /* @tp_free@ */
1919   0                                     /* @tp_is_gc@ */
1920 };
1921
1922 /*----- Hash functions ----------------------------------------------------*/
1923
1924 PyTypeObject *gchash_pytype;
1925 static PyTypeObject *ghash_pytype;
1926 PyObject *sha_pyobj, *has160_pyobj;
1927
1928 typedef struct ghash_pyobj {
1929   PyObject_HEAD
1930   ghash *h;
1931 } ghash_pyobj;
1932
1933 #define GHASH_PYCHECK(o) PyObject_TypeCheck((o), ghash_pytype)
1934 #define GHASH_H(o) (((ghash_pyobj *)(o))->h)
1935
1936 CONVFUNC(gchash, gchash *, GCHASH_CH)
1937 CONVFUNC(ghash, ghash *, GHASH_H)
1938
1939 static PyObject *ghash_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
1940 {
1941   static const char *const kwlist[] = { 0 };
1942   if (!PyArg_ParseTupleAndKeywords(arg, kw, ":new", KWLIST))
1943     goto end;
1944   return (ghash_pywrap((PyObject *)ty, GH_INIT(GCHASH_CH(ty))));
1945 end:
1946   return (0);
1947 }
1948
1949 static PyObject *gchash_pywrap(gchash *ch)
1950 {
1951   gchash_pyobj *g = newtype(gchash_pytype, 0, ch->name);
1952   g->ch = ch;
1953   g->ty.ht_type.tp_basicsize = sizeof(ghash_pyobj);
1954   g->ty.ht_type.tp_base = ghash_pytype;
1955   Py_INCREF(ghash_pytype);
1956   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
1957                             Py_TPFLAGS_BASETYPE |
1958                             Py_TPFLAGS_HEAPTYPE);
1959   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
1960   g->ty.ht_type.tp_free = 0;
1961   g->ty.ht_type.tp_new = ghash_pynew;
1962   typeready(&g->ty.ht_type);
1963   return ((PyObject *)g);
1964 }
1965
1966 PyObject *ghash_pywrap(PyObject *cobj, ghash *h)
1967 {
1968   ghash_pyobj *g;
1969   if (!cobj) cobj = gchash_pywrap((/*unconst*/ gchash *)GH_CLASS(h));
1970   else Py_INCREF(cobj);
1971   g = PyObject_NEW(ghash_pyobj, (PyTypeObject *)cobj);
1972   g->h = h;
1973   return ((PyObject *)g);
1974 }
1975
1976 static void ghash_pydealloc(PyObject *me)
1977 {
1978   GH_DESTROY(GHASH_H(me));
1979   Py_DECREF(me->ob_type);
1980   FREEOBJ(me);
1981 }
1982
1983 static PyObject *gchget_name(PyObject *me, void *hunoz)
1984   { return (PyString_FromString(GCHASH_CH(me)->name)); }
1985
1986 static PyObject *gchget_hashsz(PyObject *me, void *hunoz)
1987   { return (PyInt_FromLong(GCHASH_CH(me)->hashsz)); }
1988
1989 static PyObject *gchget_bufsz(PyObject *me, void *hunoz)
1990   { return (PyInt_FromLong(GCHASH_CH(me)->bufsz)); }
1991
1992 static PyObject *ghmeth_copy(PyObject *me, PyObject *arg)
1993 {
1994   if (!PyArg_ParseTuple(arg, ":copy")) return (0);
1995   return (ghash_pywrap((PyObject *)me->ob_type, GH_COPY(GHASH_H(me))));
1996 }
1997
1998 static PyObject *ghmeth_hash(PyObject *me, PyObject *arg)
1999 {
2000   char *p;
2001   Py_ssize_t sz;
2002   if (!PyArg_ParseTuple(arg, "s#:hash", &p, &sz)) return (0);
2003   GH_HASH(GHASH_H(me), p, sz);
2004   RETURN_ME;
2005 }
2006
2007 #define GHMETH_HASHU_(n, W, w)                                          \
2008   static PyObject *ghmeth_hashu##w(PyObject *me, PyObject *arg)         \
2009   {                                                                     \
2010     uint##n x;                                                          \
2011     if (!PyArg_ParseTuple(arg, "O&:hashu" #w, convu##n, &x)) return (0); \
2012     GH_HASHU##W(GHASH_H(me), x);                                        \
2013     RETURN_ME;                                                          \
2014   }
2015 DOUINTCONV(GHMETH_HASHU_)
2016
2017 #define GHMETH_HASHBUF_(n, W, w)                                        \
2018   static PyObject *ghmeth_hashbuf##w(PyObject *me, PyObject *arg)       \
2019   {                                                                     \
2020     char *p;                                                            \
2021     Py_ssize_t sz;                                                      \
2022     if (!PyArg_ParseTuple(arg, "s#:hashbuf" #w, &p, &sz)) goto end;     \
2023     if (sz > MASK##n) TYERR("string too long");                         \
2024     GH_HASHBUF##W(GHASH_H(me), p, sz);                                  \
2025     RETURN_ME;                                                          \
2026   end:                                                                  \
2027     return (0);                                                         \
2028   }
2029 DOUINTCONV(GHMETH_HASHBUF_)
2030
2031 static PyObject *ghmeth_hashstrz(PyObject *me, PyObject *arg)
2032 {
2033   char *p;
2034   if (!PyArg_ParseTuple(arg, "s:hashstrz", &p)) return (0);
2035   GH_HASHSTRZ(GHASH_H(me), p);
2036   RETURN_ME;
2037 }
2038
2039 static PyObject *ghmeth_done(PyObject *me, PyObject *arg)
2040 {
2041   ghash *g;
2042   PyObject *rc;
2043   if (!PyArg_ParseTuple(arg, ":done")) return (0);
2044   g = GH_COPY(GHASH_H(me));
2045   rc = bytestring_pywrap(0, g->ops->c->hashsz);
2046   GH_DONE(g, PyString_AS_STRING(rc));
2047   GH_DESTROY(g);
2048   return (rc);
2049 }
2050
2051 static PyGetSetDef gchash_pygetset[] = {
2052 #define GETSETNAME(op, name) gch##op##_##name
2053   GET   (bufsz,         "CH.bufsz -> hash buffer size, or zero")
2054   GET   (hashsz,        "CH.hashsz -> hash output size")
2055   GET   (name,          "CH.name -> name of this kind of hash")
2056 #undef GETSETNAME
2057   { 0 }
2058 };
2059
2060 static PyMethodDef ghash_pymethods[] = {
2061 #define METHNAME(name) ghmeth_##name
2062   METH  (copy,          "H.copy() -> HH")
2063   METH  (hash,          "H.hash(M)")
2064 #define METHU_(n, W, w) METH(hashu##w, "H.hashu" #w "(WORD)")
2065   DOUINTCONV(METHU_)
2066 #undef METHU_
2067 #define METHBUF_(n, W, w) METH(hashbuf##w, "H.hashbuf" #w "(BYTES)")
2068   DOUINTCONV(METHBUF_)
2069 #undef METHBUF_
2070   METH  (hashstrz,      "H.hashstrz(STRING)")
2071   METH  (done,          "H.done() -> HASH")
2072 #undef METHNAME
2073   { 0 }
2074 };
2075
2076 static PyTypeObject gchash_pytype_skel = {
2077   PyObject_HEAD_INIT(0) 0,              /* Header */
2078   "GCHash",                             /* @tp_name@ */
2079   sizeof(gchash_pyobj),                 /* @tp_basicsize@ */
2080   0,                                    /* @tp_itemsize@ */
2081
2082   0,                                    /* @tp_dealloc@ */
2083   0,                                    /* @tp_print@ */
2084   0,                                    /* @tp_getattr@ */
2085   0,                                    /* @tp_setattr@ */
2086   0,                                    /* @tp_compare@ */
2087   0,                                    /* @tp_repr@ */
2088   0,                                    /* @tp_as_number@ */
2089   0,                                    /* @tp_as_sequence@ */
2090   0,                                    /* @tp_as_mapping@ */
2091   0,                                    /* @tp_hash@ */
2092   0,                                    /* @tp_call@ */
2093   0,                                    /* @tp_str@ */
2094   0,                                    /* @tp_getattro@ */
2095   0,                                    /* @tp_setattro@ */
2096   0,                                    /* @tp_as_buffer@ */
2097   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2098     Py_TPFLAGS_BASETYPE,
2099
2100   /* @tp_doc@ */
2101   "Hash function metaclass.",
2102
2103   0,                                    /* @tp_traverse@ */
2104   0,                                    /* @tp_clear@ */
2105   0,                                    /* @tp_richcompare@ */
2106   0,                                    /* @tp_weaklistoffset@ */
2107   0,                                    /* @tp_iter@ */
2108   0,                                    /* @tp_iternext@ */
2109   0,                                    /* @tp_methods@ */
2110   0,                                    /* @tp_members@ */
2111   gchash_pygetset,                      /* @tp_getset@ */
2112   0,                                    /* @tp_base@ */
2113   0,                                    /* @tp_dict@ */
2114   0,                                    /* @tp_descr_get@ */
2115   0,                                    /* @tp_descr_set@ */
2116   0,                                    /* @tp_dictoffset@ */
2117   0,                                    /* @tp_init@ */
2118   PyType_GenericAlloc,                  /* @tp_alloc@ */
2119   abstract_pynew,                       /* @tp_new@ */
2120   0,                                    /* @tp_free@ */
2121   0                                     /* @tp_is_gc@ */
2122 };
2123
2124 static PyTypeObject ghash_pytype_skel = {
2125   PyObject_HEAD_INIT(0) 0,              /* Header */
2126   "GHash",                              /* @tp_name@ */
2127   sizeof(ghash_pyobj),                  /* @tp_basicsize@ */
2128   0,                                    /* @tp_itemsize@ */
2129
2130   ghash_pydealloc,                      /* @tp_dealloc@ */
2131   0,                                    /* @tp_print@ */
2132   0,                                    /* @tp_getattr@ */
2133   0,                                    /* @tp_setattr@ */
2134   0,                                    /* @tp_compare@ */
2135   0,                                    /* @tp_repr@ */
2136   0,                                    /* @tp_as_number@ */
2137   0,                                    /* @tp_as_sequence@ */
2138   0,                                    /* @tp_as_mapping@ */
2139   0,                                    /* @tp_hash@ */
2140   0,                                    /* @tp_call@ */
2141   0,                                    /* @tp_str@ */
2142   0,                                    /* @tp_getattro@ */
2143   0,                                    /* @tp_setattro@ */
2144   0,                                    /* @tp_as_buffer@ */
2145   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2146     Py_TPFLAGS_BASETYPE,
2147
2148   /* @tp_doc@ */
2149   "Hash function, abstract base class.",
2150
2151   0,                                    /* @tp_traverse@ */
2152   0,                                    /* @tp_clear@ */
2153   0,                                    /* @tp_richcompare@ */
2154   0,                                    /* @tp_weaklistoffset@ */
2155   0,                                    /* @tp_iter@ */
2156   0,                                    /* @tp_iternext@ */
2157   ghash_pymethods,                      /* @tp_methods@ */
2158   0,                                    /* @tp_members@ */
2159   0,                                    /* @tp_getset@ */
2160   0,                                    /* @tp_base@ */
2161   0,                                    /* @tp_dict@ */
2162   0,                                    /* @tp_descr_get@ */
2163   0,                                    /* @tp_descr_set@ */
2164   0,                                    /* @tp_dictoffset@ */
2165   0,                                    /* @tp_init@ */
2166   PyType_GenericAlloc,                  /* @tp_alloc@ */
2167   abstract_pynew,                       /* @tp_new@ */
2168   0,                                    /* @tp_free@ */
2169   0                                     /* @tp_is_gc@ */
2170 };
2171
2172 /*----- Message authentication --------------------------------------------*/
2173
2174 static PyTypeObject *gcmac_pytype, *gmac_pytype, *gmhash_pytype;
2175
2176 typedef struct gcmac_pyobj {
2177   PyHeapTypeObject ty;
2178   gcmac *cm;
2179 } gcmac_pyobj;
2180
2181 #define GCMAC_PYCHECK(o) PyObject_TypeCheck((o), gcmac_pytype)
2182 #define GCMAC_CM(o) (((gcmac_pyobj *)(o))->cm)
2183 #define GCMAC_F(o) (((gcmac_pyobj *)(o))->f)
2184 CONVFUNC(gcmac, gcmac *, GCMAC_CM)
2185 static PyObject *gmac_pywrap(PyObject *, gmac *);
2186
2187 typedef struct gmac_pyobj {
2188   PyHeapTypeObject ty;
2189   gmac *m;
2190 } gmac_pyobj;
2191
2192 extern PyTypeObject *gmac_pytype;
2193 #define GMAC_PYCHECK(o) PyObject_TypeCheck((o), gmac_pytype)
2194 #define GMAC_M(o) (((gmac_pyobj *)(o))->m)
2195 #define GMAC_F(o) (((gmac_pyobj *)(o))->f)
2196 extern PyObject *gmac_pywrap(PyObject *, gmac *);
2197 extern int convgmac(PyObject *, void *);
2198
2199 static PyObject *gmac_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
2200 {
2201   static const char *const kwlist[] = { "k", 0 };
2202   char *k;
2203   Py_ssize_t sz;
2204
2205   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &k, &sz))
2206     goto end;
2207   if (keysz(sz, GCMAC_CM(ty)->keysz) != sz) VALERR("bad key length");
2208   return (gmac_pywrap((PyObject *)ty,
2209                       GM_KEY(GCMAC_CM(ty), k, sz)));
2210 end:
2211   return (0);
2212 }
2213
2214 static PyObject *gmhash_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
2215 {
2216   static const char *const kwlist[] = { 0 };
2217   ghash_pyobj *g;
2218
2219   if (!PyArg_ParseTupleAndKeywords(arg, kw, ":new", KWLIST)) return (0);
2220   g = PyObject_NEW(ghash_pyobj, ty);
2221   g->h = GM_INIT(GMAC_M(ty));
2222   Py_INCREF(ty);
2223   return ((PyObject *)g);
2224 }
2225
2226 static PyObject *gcmac_pywrap(gcmac *cm)
2227 {
2228   gcmac_pyobj *g = newtype(gcmac_pytype, 0, cm->name);
2229   g->cm = cm;
2230   g->ty.ht_type.tp_basicsize = sizeof(gmac_pyobj);
2231   g->ty.ht_type.tp_base = gmac_pytype;
2232   Py_INCREF(gmac_pytype);
2233   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
2234                             Py_TPFLAGS_BASETYPE |
2235                             Py_TPFLAGS_HEAPTYPE);
2236   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
2237   g->ty.ht_type.tp_free = 0;
2238   g->ty.ht_type.tp_new = gmac_pynew;
2239   typeready(&g->ty.ht_type);
2240   return ((PyObject *)g);
2241 }
2242
2243 static PyObject *gmac_pywrap(PyObject *cobj, gmac *m)
2244 {
2245   gmac_pyobj *g;
2246   if (!cobj) cobj = gcmac_pywrap((/*unconst*/ gcmac *)GM_CLASS(m));
2247   else Py_INCREF(cobj);
2248   g = newtype((PyTypeObject *)cobj, 0, 0);
2249   g->ty.ht_type.tp_basicsize = sizeof(ghash_pyobj);
2250   g->ty.ht_name = PyString_FromFormat("%s(keyed)", m->ops->c->name);
2251   g->ty.ht_type.tp_name = PyString_AS_STRING(g->ty.ht_name);
2252   g->ty.ht_type.tp_base = gmhash_pytype;
2253   Py_INCREF(gmac_pytype);
2254   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
2255                             Py_TPFLAGS_BASETYPE |
2256                             Py_TPFLAGS_HEAPTYPE);
2257   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
2258   g->ty.ht_type.tp_free = 0;
2259   g->ty.ht_type.tp_new = gmhash_pynew;
2260   typeready(&g->ty.ht_type);
2261   g->m = m;
2262   return ((PyObject *)g);
2263 }
2264
2265 static void gmac_pydealloc(PyObject *me)
2266 {
2267   GM_DESTROY(GMAC_M(me));
2268   Py_DECREF(me->ob_type);
2269   PyType_Type.tp_dealloc(me);
2270 }
2271
2272 static PyObject *gcmget_name(PyObject *me, void *hunoz)
2273   { return (PyString_FromString(GCMAC_CM(me)->name)); }
2274
2275 static PyObject *gcmget_keysz(PyObject *me, void *hunoz)
2276   { return (keysz_pywrap(GCMAC_CM(me)->keysz)); }
2277
2278 static PyObject *gcmget_tagsz(PyObject *me, void *hunoz)
2279   { return (PyInt_FromLong(GCMAC_CM(me)->hashsz)); }
2280
2281 static PyGetSetDef gcmac_pygetset[] = {
2282 #define GETSETNAME(op, name) gcm##op##_##name
2283   GET   (keysz,         "CM.keysz -> acceptable key sizes")
2284   GET   (tagsz,         "CM.tagsz -> MAC output size")
2285   GET   (name,          "CM.name -> name of this kind of MAC")
2286 #undef GETSETNAME
2287   { 0 }
2288 };
2289
2290 static PyTypeObject gcmac_pytype_skel = {
2291   PyObject_HEAD_INIT(0) 0,              /* Header */
2292   "GCMAC",                              /* @tp_name@ */
2293   sizeof(gchash_pyobj),                 /* @tp_basicsize@ */
2294   0,                                    /* @tp_itemsize@ */
2295
2296   0,                                    /* @tp_dealloc@ */
2297   0,                                    /* @tp_print@ */
2298   0,                                    /* @tp_getattr@ */
2299   0,                                    /* @tp_setattr@ */
2300   0,                                    /* @tp_compare@ */
2301   0,                                    /* @tp_repr@ */
2302   0,                                    /* @tp_as_number@ */
2303   0,                                    /* @tp_as_sequence@ */
2304   0,                                    /* @tp_as_mapping@ */
2305   0,                                    /* @tp_hash@ */
2306   0,                                    /* @tp_call@ */
2307   0,                                    /* @tp_str@ */
2308   0,                                    /* @tp_getattro@ */
2309   0,                                    /* @tp_setattro@ */
2310   0,                                    /* @tp_as_buffer@ */
2311   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2312     Py_TPFLAGS_BASETYPE,
2313
2314   /* @tp_doc@ */
2315   "Message authentication code metametaclass.",
2316
2317   0,                                    /* @tp_traverse@ */
2318   0,                                    /* @tp_clear@ */
2319   0,                                    /* @tp_richcompare@ */
2320   0,                                    /* @tp_weaklistoffset@ */
2321   0,                                    /* @tp_iter@ */
2322   0,                                    /* @tp_iternext@ */
2323   0,                                    /* @tp_methods@ */
2324   0,                                    /* @tp_members@ */
2325   gcmac_pygetset,                       /* @tp_getset@ */
2326   0,                                    /* @tp_base@ */
2327   0,                                    /* @tp_dict@ */
2328   0,                                    /* @tp_descr_get@ */
2329   0,                                    /* @tp_descr_set@ */
2330   0,                                    /* @tp_dictoffset@ */
2331   0,                                    /* @tp_init@ */
2332   PyType_GenericAlloc,                  /* @tp_alloc@ */
2333   abstract_pynew,                       /* @tp_new@ */
2334   0,                                    /* @tp_free@ */
2335   0                                     /* @tp_is_gc@ */
2336 };
2337
2338 static PyTypeObject gmac_pytype_skel = {
2339   PyObject_HEAD_INIT(0) 0,              /* Header */
2340   "GMAC",                               /* @tp_name@ */
2341   sizeof(gmac_pyobj),                   /* @tp_basicsize@ */
2342   0,                                    /* @tp_itemsize@ */
2343
2344   gmac_pydealloc,                       /* @tp_dealloc@ */
2345   0,                                    /* @tp_print@ */
2346   0,                                    /* @tp_getattr@ */
2347   0,                                    /* @tp_setattr@ */
2348   0,                                    /* @tp_compare@ */
2349   0,                                    /* @tp_repr@ */
2350   0,                                    /* @tp_as_number@ */
2351   0,                                    /* @tp_as_sequence@ */
2352   0,                                    /* @tp_as_mapping@ */
2353   0,                                    /* @tp_hash@ */
2354   0,                                    /* @tp_call@ */
2355   0,                                    /* @tp_str@ */
2356   0,                                    /* @tp_getattro@ */
2357   0,                                    /* @tp_setattro@ */
2358   0,                                    /* @tp_as_buffer@ */
2359   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2360     Py_TPFLAGS_BASETYPE,
2361
2362   /* @tp_doc@ */
2363   "Message authentication code metaclass, abstract base class.",
2364
2365   0,                                    /* @tp_traverse@ */
2366   0,                                    /* @tp_clear@ */
2367   0,                                    /* @tp_richcompare@ */
2368   0,                                    /* @tp_weaklistoffset@ */
2369   0,                                    /* @tp_iter@ */
2370   0,                                    /* @tp_iternext@ */
2371   0,                                    /* @tp_methods@ */
2372   0,                                    /* @tp_members@ */
2373   0,                                    /* @tp_getset@ */
2374   0,                                    /* @tp_base@ */
2375   0,                                    /* @tp_dict@ */
2376   0,                                    /* @tp_descr_get@ */
2377   0,                                    /* @tp_descr_set@ */
2378   0,                                    /* @tp_dictoffset@ */
2379   0,                                    /* @tp_init@ */
2380   PyType_GenericAlloc,                  /* @tp_alloc@ */
2381   abstract_pynew,                       /* @tp_new@ */
2382   0,                                    /* @tp_free@ */
2383   0                                     /* @tp_is_gc@ */
2384 };
2385
2386 static PyTypeObject gmhash_pytype_skel = {
2387   PyObject_HEAD_INIT(0) 0,              /* Header */
2388   "GMACHash",                           /* @tp_name@ */
2389   sizeof(ghash_pyobj),                  /* @tp_basicsize@ */
2390   0,                                    /* @tp_itemsize@ */
2391
2392   ghash_pydealloc,                      /* @tp_dealloc@ */
2393   0,                                    /* @tp_print@ */
2394   0,                                    /* @tp_getattr@ */
2395   0,                                    /* @tp_setattr@ */
2396   0,                                    /* @tp_compare@ */
2397   0,                                    /* @tp_repr@ */
2398   0,                                    /* @tp_as_number@ */
2399   0,                                    /* @tp_as_sequence@ */
2400   0,                                    /* @tp_as_mapping@ */
2401   0,                                    /* @tp_hash@ */
2402   0,                                    /* @tp_call@ */
2403   0,                                    /* @tp_str@ */
2404   0,                                    /* @tp_getattro@ */
2405   0,                                    /* @tp_setattro@ */
2406   0,                                    /* @tp_as_buffer@ */
2407   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2408     Py_TPFLAGS_BASETYPE,
2409
2410   /* @tp_doc@ */
2411   "Message authentication code, abstract base class.",
2412
2413   0,                                    /* @tp_traverse@ */
2414   0,                                    /* @tp_clear@ */
2415   0,                                    /* @tp_richcompare@ */
2416   0,                                    /* @tp_weaklistoffset@ */
2417   0,                                    /* @tp_iter@ */
2418   0,                                    /* @tp_iternext@ */
2419   0,                                    /* @tp_methods@ */
2420   0,                                    /* @tp_members@ */
2421   0,                                    /* @tp_getset@ */
2422   0,                                    /* @tp_base@ */
2423   0,                                    /* @tp_dict@ */
2424   0,                                    /* @tp_descr_get@ */
2425   0,                                    /* @tp_descr_set@ */
2426   0,                                    /* @tp_dictoffset@ */
2427   0,                                    /* @tp_init@ */
2428   PyType_GenericAlloc,                  /* @tp_alloc@ */
2429   abstract_pynew,                       /* @tp_new@ */
2430   0,                                    /* @tp_free@ */
2431   0                                     /* @tp_is_gc@ */
2432 };
2433
2434 /*----- Special snowflake for Poly1305 ------------------------------------*/
2435
2436 PyTypeObject *poly1305cls_pytype, *poly1305key_pytype, *poly1305hash_pytype;
2437
2438 typedef struct poly1305key_pyobj {
2439   PyHeapTypeObject ty;
2440   poly1305_key k;
2441 } poly1305key_pyobj;
2442
2443 typedef struct poly1305hash_pyobj {
2444   PyObject_HEAD
2445   unsigned f;
2446 #define f_mask 1u
2447   poly1305_ctx ctx;
2448 } poly1305hash_pyobj;
2449
2450 #define P1305_F(o) (((poly1305hash_pyobj *)(o))->f)
2451 #define P1305_CTX(o) (&((poly1305hash_pyobj *)(o))->ctx)
2452 CONVFUNC(poly1305hash, poly1305_ctx *, P1305_CTX)
2453
2454 static PyObject *poly1305hash_pynew(PyTypeObject *ty,
2455                                     PyObject *arg, PyObject *kw)
2456 {
2457   static const char *const kwlist[] = { "mask", 0 };
2458   poly1305key_pyobj *pk = (poly1305key_pyobj *)ty;
2459   poly1305hash_pyobj *ph;
2460   char *m = 0;
2461   Py_ssize_t sz;
2462
2463   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|s#:new", KWLIST, &m, &sz))
2464     return (0);
2465   if (m && sz != POLY1305_MASKSZ) VALERR("bad mask length");
2466   ph = PyObject_NEW(poly1305hash_pyobj, ty);
2467   ph->f = 0;
2468   if (m) ph->f |= f_mask;
2469   poly1305_macinit(&ph->ctx, &pk->k, m);
2470   Py_INCREF(ty);
2471   return ((PyObject *)ph);
2472 end:
2473   return (0);
2474 }
2475
2476 static PyObject *poly1305key_pynew(PyTypeObject *ty,
2477                                    PyObject *arg, PyObject *kw)
2478 {
2479   static const char *const kwlist[] = { "k", 0 };
2480   poly1305key_pyobj *pk;
2481   char *k;
2482   Py_ssize_t sz;
2483
2484   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &k, &sz))
2485     goto end;
2486   if (keysz(sz, poly1305_keysz) != sz) VALERR("bad key length");
2487
2488   pk = newtype(ty, 0, 0);
2489   pk->ty.ht_name = PyString_FromString("poly1305(keyed)");
2490   pk->ty.ht_type.tp_basicsize = sizeof(poly1305hash_pyobj);
2491   pk->ty.ht_type.tp_name = PyString_AS_STRING(pk->ty.ht_name);
2492   pk->ty.ht_type.tp_base = poly1305hash_pytype;
2493   Py_INCREF(poly1305key_pytype);
2494   pk->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
2495                              Py_TPFLAGS_BASETYPE |
2496                              Py_TPFLAGS_HEAPTYPE);
2497   pk->ty.ht_type.tp_alloc = PyType_GenericAlloc;
2498   pk->ty.ht_type.tp_free = 0;
2499   pk->ty.ht_type.tp_new = poly1305hash_pynew;
2500   typeready(&pk->ty.ht_type);
2501
2502   poly1305_keyinit(&pk->k, k, sz);
2503   return ((PyObject *)pk);
2504
2505 end:
2506   return (0);
2507 }
2508
2509 static PyObject *poly1305clsget_name(PyObject *me, void *hunoz)
2510   { return (PyString_FromString("poly1305")); }
2511
2512 static PyObject *poly1305clsget_keysz(PyObject *me, void *hunoz)
2513   { return (keysz_pywrap(poly1305_keysz)); }
2514
2515 static PyObject *poly1305clsget_masksz(PyObject *me, void *hunoz)
2516   { return (PyInt_FromLong(POLY1305_MASKSZ)); }
2517
2518 static PyObject *poly1305clsget_tagsz(PyObject *me, void *hunoz)
2519   { return (PyInt_FromLong(POLY1305_TAGSZ)); }
2520
2521 static PyObject *polymeth_copy(PyObject *me, PyObject *arg)
2522 {
2523   poly1305hash_pyobj *ph;
2524   if (!PyArg_ParseTuple(arg, ":copy")) return (0);
2525   ph = PyObject_NEW(poly1305hash_pyobj, me->ob_type);
2526   poly1305_copy(&ph->ctx, P1305_CTX(me));
2527   Py_INCREF(me->ob_type);
2528   return ((PyObject *)ph);
2529 }
2530
2531 static PyObject *polymeth_hash(PyObject *me, PyObject *arg)
2532 {
2533   char *p;
2534   Py_ssize_t sz;
2535   if (!PyArg_ParseTuple(arg, "s#:hash", &p, &sz)) return (0);
2536   poly1305_hash(P1305_CTX(me), p, sz);
2537   RETURN_ME;
2538 }
2539
2540 #define POLYMETH_HASHU_(n, W, w)                                        \
2541   static PyObject *polymeth_hashu##w(PyObject *me, PyObject *arg)       \
2542   {                                                                     \
2543     uint##n x;                                                          \
2544     octet b[SZ_##W];                                                    \
2545     if (!PyArg_ParseTuple(arg, "O&:hashu" #w, convu##n, &x)) return (0); \
2546     STORE##W(b, x); poly1305_hash(P1305_CTX(me), b, sizeof(b));         \
2547     RETURN_ME;                                                          \
2548   }
2549 DOUINTCONV(POLYMETH_HASHU_)
2550
2551 #define POLYMETH_HASHBUF_(n, W, w)                                      \
2552   static PyObject *polymeth_hashbuf##w(PyObject *me, PyObject *arg)     \
2553   {                                                                     \
2554     char *p;                                                            \
2555     Py_ssize_t sz;                                                      \
2556     octet b[SZ_##W];                                                    \
2557     if (!PyArg_ParseTuple(arg, "s#:hashbuf" #w, &p, &sz)) goto end;     \
2558     if (sz > MASK##n) TYERR("string too long");                         \
2559     STORE##W(b, sz); poly1305_hash(P1305_CTX(me), b, sizeof(b));        \
2560     poly1305_hash(P1305_CTX(me), p, sz);                                \
2561     RETURN_ME;                                                          \
2562   end:                                                                  \
2563     return (0);                                                         \
2564   }
2565 DOUINTCONV(POLYMETH_HASHBUF_)
2566
2567 static PyObject *polymeth_hashstrz(PyObject *me, PyObject *arg)
2568 {
2569   char *p;
2570   if (!PyArg_ParseTuple(arg, "s:hashstrz", &p)) return (0);
2571   poly1305_hash(P1305_CTX(me), p, strlen(p) + 1);
2572   RETURN_ME;
2573 }
2574
2575 static PyObject *polymeth_flush(PyObject *me, PyObject *arg)
2576 {
2577   if (!PyArg_ParseTuple(arg, ":flush")) return (0);
2578   poly1305_flush(P1305_CTX(me));
2579   RETURN_ME;
2580 }
2581
2582 static PyObject *polymeth_flushzero(PyObject *me, PyObject *arg)
2583 {
2584   if (!PyArg_ParseTuple(arg, ":flushzero")) return (0);
2585   poly1305_flushzero(P1305_CTX(me));
2586   RETURN_ME;
2587 }
2588
2589 static PyObject *polymeth_concat(PyObject *me, PyObject *arg)
2590 {
2591   PyObject *pre, *suff;
2592   if (!PyArg_ParseTuple(arg, "OO:concat", &pre, &suff)) return (0);
2593   if (!PyObject_TypeCheck(pre, poly1305hash_pytype) ||
2594       !PyObject_TypeCheck(suff, poly1305hash_pytype))
2595     TYERR("wanted a poly1305hash");
2596   if (me->ob_type != pre->ob_type || me->ob_type != suff->ob_type)
2597     TYERR("key mismatch");
2598   if (P1305_CTX(pre)->nbuf) VALERR("prefix is not block-aligned");
2599   poly1305_concat(P1305_CTX(me), P1305_CTX(pre), P1305_CTX(suff));
2600   RETURN_ME;
2601 end:
2602   return (0);
2603 }
2604
2605 static PyObject *polymeth_done(PyObject *me, PyObject *arg)
2606 {
2607   PyObject *rc;
2608   if (!PyArg_ParseTuple(arg, ":done")) return (0);
2609   if (!(P1305_F(me) & f_mask)) VALERR("no mask");
2610   rc = bytestring_pywrap(0, POLY1305_TAGSZ);
2611   poly1305_done(P1305_CTX(me), PyString_AS_STRING(rc));
2612   return (rc);
2613 end:
2614   return (0);
2615 }
2616
2617 static PyGetSetDef poly1305cls_pygetset[] = {
2618 #define GETSETNAME(op, name) poly1305cls##op##_##name
2619   GET   (keysz,         "PC.keysz -> acceptable key sizes")
2620   GET   (masksz,        "PC.masksz -> mask size")
2621   GET   (tagsz,         "PC.tagsz -> MAC output size")
2622   GET   (name,          "PC.name -> name of this kind of MAC")
2623 #undef GETSETNAME
2624   { 0 }
2625 };
2626
2627 static PyMethodDef poly1305hash_pymethods[] = {
2628 #define METHNAME(name) polymeth_##name
2629   METH  (copy,          "P.copy() -> PP")
2630   METH  (hash,          "P.hash(M)")
2631 #define METHU_(n, W, w) METH(hashu##w, "P.hashu" #w "(WORD)")
2632   DOUINTCONV(METHU_)
2633 #undef METHU_
2634 #define METHBUF_(n, W, w) METH(hashbuf##w, "P.hashbuf" #w "(BYTES)")
2635   DOUINTCONV(METHBUF_)
2636 #undef METHBUF_
2637   METH  (hashstrz,      "P.hashstrz(STRING)")
2638   METH  (flush,         "P.flush()")
2639   METH  (flushzero,     "P.flushzero()")
2640   METH  (concat,        "P.concat(PREFIX, SUFFIX)")
2641   METH  (done,          "P.done() -> TAG")
2642 #undef METHNAME
2643   { 0 }
2644 };
2645
2646 static PyTypeObject poly1305cls_pytype_skel = {
2647   PyObject_HEAD_INIT(0) 0,              /* Header */
2648   "Poly1305Class",                      /* @tp_name@ */
2649   sizeof(PyHeapTypeObject),             /* @tp_basicsize@ */
2650   0,                                    /* @tp_itemsize@ */
2651
2652   0,                                    /* @tp_dealloc@ */
2653   0,                                    /* @tp_print@ */
2654   0,                                    /* @tp_getattr@ */
2655   0,                                    /* @tp_setattr@ */
2656   0,                                    /* @tp_compare@ */
2657   0,                                    /* @tp_repr@ */
2658   0,                                    /* @tp_as_number@ */
2659   0,                                    /* @tp_as_sequence@ */
2660   0,                                    /* @tp_as_mapping@ */
2661   0,                                    /* @tp_hash@ */
2662   0,                                    /* @tp_call@ */
2663   0,                                    /* @tp_str@ */
2664   0,                                    /* @tp_getattro@ */
2665   0,                                    /* @tp_setattro@ */
2666   0,                                    /* @tp_as_buffer@ */
2667   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2668     Py_TPFLAGS_BASETYPE,
2669
2670   /* @tp_doc@ */
2671   "Poly1305 metametaclass.  Best not to ask.",
2672
2673   0,                                    /* @tp_traverse@ */
2674   0,                                    /* @tp_clear@ */
2675   0,                                    /* @tp_richcompare@ */
2676   0,                                    /* @tp_weaklistoffset@ */
2677   0,                                    /* @tp_iter@ */
2678   0,                                    /* @tp_iternext@ */
2679   0,                                    /* @tp_methods@ */
2680   0,                                    /* @tp_members@ */
2681   poly1305cls_pygetset,                 /* @tp_getset@ */
2682   0,                                    /* @tp_base@ */
2683   0,                                    /* @tp_dict@ */
2684   0,                                    /* @tp_descr_get@ */
2685   0,                                    /* @tp_descr_set@ */
2686   0,                                    /* @tp_dictoffset@ */
2687   0,                                    /* @tp_init@ */
2688   PyType_GenericAlloc,                  /* @tp_alloc@ */
2689   abstract_pynew,                       /* @tp_new@ */
2690   0,                                    /* @tp_free@ */
2691   0                                     /* @tp_is_gc@ */
2692 };
2693
2694 static PyTypeObject poly1305key_pytype_skel = {
2695   PyObject_HEAD_INIT(0) 0,              /* Header */
2696   "poly1305",                           /* @tp_name@ */
2697   sizeof(poly1305key_pyobj),            /* @tp_basicsize@ */
2698   0,                                    /* @tp_itemsize@ */
2699
2700   0,                                    /* @tp_dealloc@ */
2701   0,                                    /* @tp_print@ */
2702   0,                                    /* @tp_getattr@ */
2703   0,                                    /* @tp_setattr@ */
2704   0,                                    /* @tp_compare@ */
2705   0,                                    /* @tp_repr@ */
2706   0,                                    /* @tp_as_number@ */
2707   0,                                    /* @tp_as_sequence@ */
2708   0,                                    /* @tp_as_mapping@ */
2709   0,                                    /* @tp_hash@ */
2710   0,                                    /* @tp_call@ */
2711   0,                                    /* @tp_str@ */
2712   0,                                    /* @tp_getattro@ */
2713   0,                                    /* @tp_setattro@ */
2714   0,                                    /* @tp_as_buffer@ */
2715   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2716     Py_TPFLAGS_BASETYPE,
2717
2718   /* @tp_doc@ */
2719   "poly1305(K): Poly1305 key.",
2720
2721   0,                                    /* @tp_traverse@ */
2722   0,                                    /* @tp_clear@ */
2723   0,                                    /* @tp_richcompare@ */
2724   0,                                    /* @tp_weaklistoffset@ */
2725   0,                                    /* @tp_iter@ */
2726   0,                                    /* @tp_iternext@ */
2727   0,                                    /* @tp_methods@ */
2728   0,                                    /* @tp_members@ */
2729   0,                                    /* @tp_getset@ */
2730   0,                                    /* @tp_base@ */
2731   0,                                    /* @tp_dict@ */
2732   0,                                    /* @tp_descr_get@ */
2733   0,                                    /* @tp_descr_set@ */
2734   0,                                    /* @tp_dictoffset@ */
2735   0,                                    /* @tp_init@ */
2736   PyType_GenericAlloc,                  /* @tp_alloc@ */
2737   poly1305key_pynew,                    /* @tp_new@ */
2738   0,                                    /* @tp_free@ */
2739   0                                     /* @tp_is_gc@ */
2740 };
2741
2742 static PyTypeObject poly1305hash_pytype_skel = {
2743   PyObject_HEAD_INIT(0) 0,              /* Header */
2744   "Poly1305Hash",                       /* @tp_name@ */
2745   sizeof(poly1305hash_pyobj),           /* @tp_basicsize@ */
2746   0,                                    /* @tp_itemsize@ */
2747
2748   0,                                    /* @tp_dealloc@ */
2749   0,                                    /* @tp_print@ */
2750   0,                                    /* @tp_getattr@ */
2751   0,                                    /* @tp_setattr@ */
2752   0,                                    /* @tp_compare@ */
2753   0,                                    /* @tp_repr@ */
2754   0,                                    /* @tp_as_number@ */
2755   0,                                    /* @tp_as_sequence@ */
2756   0,                                    /* @tp_as_mapping@ */
2757   0,                                    /* @tp_hash@ */
2758   0,                                    /* @tp_call@ */
2759   0,                                    /* @tp_str@ */
2760   0,                                    /* @tp_getattro@ */
2761   0,                                    /* @tp_setattro@ */
2762   0,                                    /* @tp_as_buffer@ */
2763   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2764     Py_TPFLAGS_BASETYPE,
2765
2766   /* @tp_doc@ */
2767   "Poly1305 MAC context base class.",
2768
2769   0,                                    /* @tp_traverse@ */
2770   0,                                    /* @tp_clear@ */
2771   0,                                    /* @tp_richcompare@ */
2772   0,                                    /* @tp_weaklistoffset@ */
2773   0,                                    /* @tp_iter@ */
2774   0,                                    /* @tp_iternext@ */
2775   poly1305hash_pymethods,               /* @tp_methods@ */
2776   0,                                    /* @tp_members@ */
2777   0,                                    /* @tp_getset@ */
2778   0,                                    /* @tp_base@ */
2779   0,                                    /* @tp_dict@ */
2780   0,                                    /* @tp_descr_get@ */
2781   0,                                    /* @tp_descr_set@ */
2782   0,                                    /* @tp_dictoffset@ */
2783   0,                                    /* @tp_init@ */
2784   PyType_GenericAlloc,                  /* @tp_alloc@ */
2785   abstract_pynew,                       /* @tp_new@ */
2786   0,                                    /* @tp_free@ */
2787   0                                     /* @tp_is_gc@ */
2788 };
2789
2790 /*----- Special snowflake for HSalsa and HChaCha --------------------------*/
2791
2792 #define DEF_HDANCE(DANCE, HDANCE, dance, hdance)                        \
2793   static PyObject *meth_##hdance##_prf(PyObject *me, PyObject *arg)     \
2794   {                                                                     \
2795     dance##_ctx dance;                                                  \
2796     char *k, *n;                                                        \
2797     Py_ssize_t ksz, nsz;                                                \
2798     PyObject *rc;                                                       \
2799     if (!PyArg_ParseTuple(arg, "s#s#:" #hdance "_prf",                  \
2800                           &k, &ksz, &n, &nsz))                          \
2801       goto end;                                                         \
2802     if (ksz != keysz(ksz, dance##_keysz)) VALERR("bad key length");     \
2803     if (nsz != HDANCE##_INSZ) VALERR("bad input length");               \
2804     rc = bytestring_pywrap(0, HSALSA20_OUTSZ);                          \
2805     dance##_init(&dance, k, ksz, 0);                                    \
2806     hdance##_prf(&dance, n, PyString_AS_STRING(rc));                    \
2807     return (rc);                                                        \
2808   end:                                                                  \
2809     return (0);                                                         \
2810   }
2811
2812 DEF_HDANCE(SALSA20, HSALSA20, salsa20, hsalsa20)
2813 DEF_HDANCE(SALSA20, HSALSA20, salsa20, hsalsa2012)
2814 DEF_HDANCE(SALSA20, HSALSA20, salsa20, hsalsa208)
2815
2816 DEF_HDANCE(CHACHA, HCHACHA, chacha, hchacha20)
2817 DEF_HDANCE(CHACHA, HCHACHA, chacha, hchacha12)
2818 DEF_HDANCE(CHACHA, HCHACHA, chacha, hchacha8)
2819
2820 /*----- Keccak-p[1600, n] -------------------------------------------------*/
2821
2822 static PyTypeObject *kxvik_pytype;
2823
2824 typedef struct kxvik_pyobj {
2825   PyObject_HEAD
2826   keccak1600_state s;
2827   unsigned n;
2828 } kxvik_pyobj;
2829
2830 static PyObject *kxvik_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
2831 {
2832   unsigned n = 24;
2833   kxvik_pyobj *rc = 0;
2834   static const char *const kwlist[] = { "nround", 0 };
2835   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:new", KWLIST,
2836                                    convuint, &n))
2837     goto end;
2838   rc = (kxvik_pyobj *)ty->tp_alloc(ty, 0);
2839   rc->n = n;
2840   keccak1600_init(&rc->s);
2841 end:
2842   return ((PyObject *)rc);
2843 }
2844
2845 static PyObject *kxvikmeth_copy(PyObject *me, PyObject *arg)
2846 {
2847   kxvik_pyobj *k = (kxvik_pyobj *)me, *rc = 0;
2848   if (!PyArg_ParseTuple(arg, ":copy")) goto end;
2849   rc = (kxvik_pyobj *)k->ob_type->tp_alloc(k->ob_type, 0);
2850   rc->s = k->s; rc->n = k->n;
2851 end:
2852   return ((PyObject *)rc);
2853 }
2854
2855 static PyObject *kxvikmeth_mix(PyObject *me, PyObject *arg)
2856 {
2857   kxvik_pyobj *k = (kxvik_pyobj *)me;
2858   kludge64 t[25];
2859   const octet *q;
2860   octet buf[8];
2861   unsigned i;
2862   char *p; Py_ssize_t n;
2863
2864   if (!PyArg_ParseTuple(arg, "s#:mix", &p, &n)) goto end;
2865   if (n > 200) VALERR("out of range");
2866   q = (const octet *)p;
2867   i = 0;
2868   while (n > 8) { LOAD64_L_(t[i], q); i++; q += 8; n -= 8; }
2869   if (n) {
2870     memcpy(buf, q, n); memset(buf + n, 0, 8 - n);
2871     LOAD64_L_(t[i], buf); i++;
2872   }
2873   keccak1600_mix(&k->s, t, i);
2874   RETURN_ME;
2875 end:
2876   return (0);
2877 }
2878
2879 static PyObject *kxvikmeth_extract(PyObject *me, PyObject *arg)
2880 {
2881   kxvik_pyobj *k = (kxvik_pyobj *)me;
2882   PyObject *rc = 0;
2883   kludge64 t[25];
2884   octet *q, buf[8];
2885   unsigned i;
2886   unsigned n;
2887
2888   if (!PyArg_ParseTuple(arg, "O&:extract", convuint, &n)) goto end;
2889   if (n > 200) VALERR("out of range");
2890   rc = bytestring_pywrap(0, n);
2891   q = (octet *)PyString_AS_STRING(rc);
2892   keccak1600_extract(&k->s, t, (n + 7)/8);
2893   i = 0;
2894   while (n > 8) { STORE64_L_(q, t[i]); i++; q += 8; n -= 8; }
2895   if (n) { STORE64_L_(buf, t[i]); memcpy(q, buf, n); }
2896 end:
2897   return (rc);
2898 }
2899
2900 static PyObject *kxvikmeth_step(PyObject *me, PyObject *arg)
2901 {
2902   kxvik_pyobj *k = (kxvik_pyobj *)me;
2903   if (!PyArg_ParseTuple(arg, ":step")) return (0);
2904   keccak1600_p(&k->s, &k->s, k->n);
2905   RETURN_ME;
2906 }
2907
2908 static PyObject *kxvikget_nround(PyObject *me, void *hunoz)
2909 {
2910   kxvik_pyobj *k = (kxvik_pyobj *)me;
2911   return (PyInt_FromLong(k->n));
2912 }
2913
2914 static int kxvikset_nround(PyObject *me, PyObject *val, void *hunoz)
2915 {
2916   kxvik_pyobj *k = (kxvik_pyobj *)me;
2917   unsigned n;
2918   int rc = -1;
2919
2920   if (!val) NIERR("__del__");
2921   if (!convuint(val, &n)) goto end;
2922   k->n = n;
2923   rc = 0;
2924 end:
2925   return (rc);
2926 }
2927
2928 static PyGetSetDef kxvik_pygetset[] = {
2929 #define GETSETNAME(op, name) kxvik##op##_##name
2930   GETSET(nround,        "KECCAK.nround -> number of rounds")
2931 #undef GETSETNAME
2932   { 0 }
2933 };
2934
2935 static PyMethodDef kxvik_pymethods[] = {
2936 #define METHNAME(func) kxvikmeth_##func
2937   METH  (copy,          "KECCAK.copy() -> KECCAK'")
2938   METH  (mix,           "KECCAK.mix(DATA)")
2939   METH  (extract,       "KECCAK.extract(NOCTETS)")
2940   METH  (step,          "KECCAK.step()")
2941 #undef METHNAME
2942   { 0 }
2943 };
2944
2945 static PyTypeObject kxvik_pytype_skel = {
2946   PyObject_HEAD_INIT(0) 0,              /* Header */
2947   "Keccak1600",                         /* @tp_name@ */
2948   sizeof(kxvik_pyobj),                  /* @tp_basicsize@ */
2949   0,                                    /* @tp_itemsize@ */
2950
2951   0,                                    /* @tp_dealloc@ */
2952   0,                                    /* @tp_print@ */
2953   0,                                    /* @tp_getattr@ */
2954   0,                                    /* @tp_setattr@ */
2955   0,                                    /* @tp_compare@ */
2956   0,                                    /* @tp_repr@ */
2957   0,                                    /* @tp_as_number@ */
2958   0,                                    /* @tp_as_sequence@ */
2959   0,                                    /* @tp_as_mapping@ */
2960   0,                                    /* @tp_hash@ */
2961   0,                                    /* @tp_call@ */
2962   0,                                    /* @tp_str@ */
2963   0,                                    /* @tp_getattro@ */
2964   0,                                    /* @tp_setattro@ */
2965   0,                                    /* @tp_as_buffer@ */
2966   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2967     Py_TPFLAGS_BASETYPE,
2968
2969   /* @tp_doc@ */
2970   "Keccak1600([nround = 24]): Keccak-p[1600, n] state.",
2971
2972   0,                                    /* @tp_traverse@ */
2973   0,                                    /* @tp_clear@ */
2974   0,                                    /* @tp_richcompare@ */
2975   0,                                    /* @tp_weaklistoffset@ */
2976   0,                                    /* @tp_iter@ */
2977   0,                                    /* @tp_iternext@ */
2978   kxvik_pymethods,                      /* @tp_methods@ */
2979   0,                                    /* @tp_members@ */
2980   kxvik_pygetset,                       /* @tp_getset@ */
2981   0,                                    /* @tp_base@ */
2982   0,                                    /* @tp_dict@ */
2983   0,                                    /* @tp_descr_get@ */
2984   0,                                    /* @tp_descr_set@ */
2985   0,                                    /* @tp_dictoffset@ */
2986   0,                                    /* @tp_init@ */
2987   PyType_GenericAlloc,                  /* @tp_alloc@ */
2988   kxvik_pynew,                          /* @tp_new@ */
2989   0,                                    /* @tp_free@ */
2990   0                                     /* @tp_is_gc@ */
2991 };
2992
2993 static PyTypeObject *shake_pytype, *shake128_pytype, *shake256_pytype;
2994
2995 typedef struct shake_pyobj {
2996   PyObject_HEAD
2997   int st;
2998   shake_ctx h;
2999 } shake_pyobj;
3000
3001 #define SHAKE_H(o) (&((shake_pyobj *)(o))->h)
3002 #define SHAKE_ST(o) (((shake_pyobj *)(o))->st)
3003
3004 static PyObject *shake_dopynew(void (*initfn)(shake_ctx *,
3005                                               const void *, size_t,
3006                                               const void *, size_t),
3007                                PyTypeObject *ty,
3008                                PyObject *arg, PyObject *kw)
3009 {
3010   shake_pyobj *rc = 0;
3011   char *p = 0, *f = 0;
3012   Py_ssize_t psz = 0, fsz = 0;
3013   static const char *const kwlist[] = { "perso", "func", 0 };
3014
3015   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|s#s#:new", KWLIST,
3016                                    &p, &psz, &f, &fsz))
3017     goto end;
3018   rc = (shake_pyobj *)ty->tp_alloc(ty, 0);
3019   initfn(&rc->h, f, fsz, p, psz);
3020   rc->st = 0;
3021 end:
3022   return ((PyObject *)rc);
3023 }
3024
3025 static PyObject *shake128_pynew(PyTypeObject *ty,
3026                                 PyObject *arg, PyObject *kw)
3027   { return (shake_dopynew(cshake128_init, ty, arg, kw)); }
3028
3029 static PyObject *shake256_pynew(PyTypeObject *ty,
3030                                 PyObject *arg, PyObject *kw)
3031   { return (shake_dopynew(cshake256_init, ty, arg, kw)); }
3032
3033 static int shake_check(PyObject *me, int st)
3034 {
3035   if (SHAKE_ST(me) != st) VALERR("wrong state");
3036   return (0);
3037 end:
3038   return (-1);
3039 }
3040
3041 static PyObject *shakemeth_hash(PyObject *me, PyObject *arg)
3042 {
3043   char *p;
3044   Py_ssize_t sz;
3045   if (!PyArg_ParseTuple(arg, "s#:hash", &p, &sz)) return (0);
3046   if (shake_check(me, 0)) return (0);
3047   shake_hash(SHAKE_H(me), p, sz);
3048   RETURN_ME;
3049 }
3050
3051 #define SHAKEMETH_HASHU_(n, W, w)                                       \
3052   static PyObject *shakemeth_hashu##w(PyObject *me, PyObject *arg)      \
3053   {                                                                     \
3054     uint##n x;                                                          \
3055     octet b[SZ_##W];                                                    \
3056     if (!PyArg_ParseTuple(arg, "O&:hashu" #w, convu##n, &x)) return (0); \
3057     if (shake_check(me, 0)) return (0);                                 \
3058     STORE##W(b, x); shake_hash(SHAKE_H(me), b, sizeof(b));              \
3059     RETURN_ME;                                                          \
3060   }
3061 DOUINTCONV(SHAKEMETH_HASHU_)
3062
3063 #define SHAKEMETH_HASHBUF_(n, W, w)                                     \
3064   static PyObject *shakemeth_hashbuf##w(PyObject *me, PyObject *arg)    \
3065   {                                                                     \
3066     char *p;                                                            \
3067     Py_ssize_t sz;                                                      \
3068     octet b[SZ_##W];                                                    \
3069     if (!PyArg_ParseTuple(arg, "s#:hashbuf" #w, &p, &sz)) goto end;     \
3070     if (sz > MASK##n) TYERR("string too long");                         \
3071     if (shake_check(me, 0)) goto end;                                   \
3072     STORE##W(b, sz); shake_hash(SHAKE_H(me), b, sizeof(b));             \
3073     shake_hash(SHAKE_H(me), p, sz);                                     \
3074     RETURN_ME;                                                          \
3075   end:                                                                  \
3076     return (0);                                                         \
3077   }
3078 DOUINTCONV(SHAKEMETH_HASHBUF_)
3079
3080 static PyObject *shakemeth_hashstrz(PyObject *me, PyObject *arg)
3081 {
3082   char *p;
3083   if (!PyArg_ParseTuple(arg, "s:hashstrz", &p)) return (0);
3084   if (shake_check(me, 0)) return (0);
3085   shake_hash(SHAKE_H(me), p, strlen(p) + 1);
3086   RETURN_ME;
3087 }
3088
3089 static PyObject *shakemeth_xof(PyObject *me, PyObject *arg)
3090 {
3091   if (!PyArg_ParseTuple(arg, ":xof")) goto end;
3092   if (shake_check(me, 0)) goto end;
3093   shake_xof(SHAKE_H(me));
3094   SHAKE_ST(me) = 1;
3095   RETURN_ME;
3096 end:
3097   return (0);
3098 }
3099
3100 static PyObject *shakemeth_done(PyObject *me, PyObject *arg)
3101 {
3102   PyObject *rc = 0;
3103   size_t n;
3104   if (!PyArg_ParseTuple(arg, "O&:done", convszt, &n)) goto end;
3105   if (shake_check(me, 0)) goto end;
3106   rc = bytestring_pywrap(0, n);
3107   shake_done(SHAKE_H(me), PyString_AS_STRING(rc), n);
3108   SHAKE_ST(me) = -1;
3109 end:
3110   return (rc);
3111 }
3112
3113 static PyObject *shakemeth_copy(PyObject *me, PyObject *arg)
3114 {
3115   shake_pyobj *rc = 0;
3116
3117   if (!PyArg_ParseTuple(arg, ":copy")) goto end;
3118   rc = PyObject_NEW(shake_pyobj, me->ob_type);
3119   rc->h = *SHAKE_H(me);
3120   rc->st = SHAKE_ST(me);
3121 end:
3122   return ((PyObject *)rc);
3123 }
3124
3125 static PyObject *shakemeth_get(PyObject *me, PyObject *arg)
3126 {
3127   PyObject *rc = 0;
3128   size_t sz;
3129
3130   if (!PyArg_ParseTuple(arg, "O&:get", convszt, &sz)) goto end;
3131   if (shake_check(me, 1)) goto end;
3132   rc = bytestring_pywrap(0, sz);
3133   shake_get(SHAKE_H(me), PyString_AS_STRING(rc), sz);
3134 end:
3135   return (rc);
3136 }
3137
3138 static PyObject *shakemeth_mask(PyObject *me, PyObject *arg)
3139 {
3140   PyObject *rc = 0;
3141   char *p; Py_ssize_t sz;
3142
3143   if (!PyArg_ParseTuple(arg, "s#:mask", &p, &sz)) goto end;
3144   if (shake_check(me, 1)) goto end;
3145   rc = bytestring_pywrap(0, sz);
3146   shake_mask(SHAKE_H(me), p, PyString_AS_STRING(rc), sz);
3147 end:
3148   return (rc);
3149 }
3150
3151 static PyObject *shakeget_rate(PyObject *me, void *hunoz)
3152   { return (PyInt_FromLong(SHAKE_H(me)->h.r)); }
3153
3154 static PyObject *shakeget_buffered(PyObject *me, void *hunoz)
3155   { return (PyInt_FromLong(SHAKE_H(me)->h.n)); }
3156
3157 static PyObject *shakeget_state(PyObject *me, void *hunoz)
3158 {
3159   int st = SHAKE_ST(me);
3160   return (PyString_FromString(st == 0 ? "absorb" :
3161                               st == 1 ? "squeeze" : "dead"));
3162 }
3163
3164 static PyGetSetDef shake_pygetset[] = {
3165 #define GETSETNAME(op, name) shake##op##_##name
3166   GET   (rate,          "S.rate -> rate, in bytes")
3167   GET   (buffered,      "S.buffered -> amount currently buffered")
3168   GET   (state,         "S.state -> `absorb', `squeeze', `dead'")
3169 #undef GETSETNAME
3170   { 0 }
3171 };
3172
3173 static PyMethodDef shake_pymethods[] = {
3174 #define METHNAME(func) shakemeth_##func
3175   METH  (copy,          "S.copy() -> SS")
3176   METH  (hash,          "S.hash(M)")
3177 #define METHU_(n, W, w) METH(hashu##w, "S.hashu" #w "(WORD)")
3178   DOUINTCONV(METHU_)
3179 #undef METHU_
3180 #define METHBUF_(n, W, w) METH(hashbuf##w, "S.hashbuf" #w "(BYTES)")
3181   DOUINTCONV(METHBUF_)
3182 #undef METHBUF_
3183   METH  (hashstrz,      "S.hashstrz(STRING)")
3184   METH  (xof,           "S.xof()")
3185   METH  (done,          "S.done(LEN) -> H")
3186   METH  (get,           "S.get(LEN) -> H")
3187   METH  (mask,          "S.mask(M) -> C")
3188 #undef METHNAME
3189   { 0 }
3190 };
3191
3192 static PyTypeObject shake_pytype_skel = {
3193   PyObject_HEAD_INIT(0) 0,              /* Header */
3194   "Shake",                              /* @tp_name@ */
3195   sizeof(shake_pyobj),                  /* @tp_basicsize@ */
3196   0,                                    /* @tp_itemsize@ */
3197
3198   0,                                    /* @tp_dealloc@ */
3199   0,                                    /* @tp_print@ */
3200   0,                                    /* @tp_getattr@ */
3201   0,                                    /* @tp_setattr@ */
3202   0,                                    /* @tp_compare@ */
3203   0,                                    /* @tp_repr@ */
3204   0,                                    /* @tp_as_number@ */
3205   0,                                    /* @tp_as_sequence@ */
3206   0,                                    /* @tp_as_mapping@ */
3207   0,                                    /* @tp_hash@ */
3208   0,                                    /* @tp_call@ */
3209   0,                                    /* @tp_str@ */
3210   0,                                    /* @tp_getattro@ */
3211   0,                                    /* @tp_setattro@ */
3212   0,                                    /* @tp_as_buffer@ */
3213   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
3214     Py_TPFLAGS_BASETYPE,
3215
3216   /* @tp_doc@ */
3217   "SHAKE/cSHAKE/KMAC base class.",
3218
3219   0,                                    /* @tp_traverse@ */
3220   0,                                    /* @tp_clear@ */
3221   0,                                    /* @tp_richcompare@ */
3222   0,                                    /* @tp_weaklistoffset@ */
3223   0,                                    /* @tp_iter@ */
3224   0,                                    /* @tp_iternext@ */
3225   shake_pymethods,                      /* @tp_methods@ */
3226   0,                                    /* @tp_members@ */
3227   shake_pygetset,                       /* @tp_getset@ */
3228   0,                                    /* @tp_base@ */
3229   0,                                    /* @tp_dict@ */
3230   0,                                    /* @tp_descr_get@ */
3231   0,                                    /* @tp_descr_set@ */
3232   0,                                    /* @tp_dictoffset@ */
3233   0,                                    /* @tp_init@ */
3234   PyType_GenericAlloc,                  /* @tp_alloc@ */
3235   abstract_pynew,                       /* @tp_new@ */
3236   0,                                    /* @tp_free@ */
3237   0                                     /* @tp_is_gc@ */
3238 };
3239
3240 static PyTypeObject shake128_pytype_skel = {
3241   PyObject_HEAD_INIT(0) 0,              /* Header */
3242   "Shake128",                           /* @tp_name@ */
3243   0,                                    /* @tp_basicsize@ */
3244   0,                                    /* @tp_itemsize@ */
3245
3246   0,                                    /* @tp_dealloc@ */
3247   0,                                    /* @tp_print@ */
3248   0,                                    /* @tp_getattr@ */
3249   0,                                    /* @tp_setattr@ */
3250   0,                                    /* @tp_compare@ */
3251   0,                                    /* @tp_repr@ */
3252   0,                                    /* @tp_as_number@ */
3253   0,                                    /* @tp_as_sequence@ */
3254   0,                                    /* @tp_as_mapping@ */
3255   0,                                    /* @tp_hash@ */
3256   0,                                    /* @tp_call@ */
3257   0,                                    /* @tp_str@ */
3258   0,                                    /* @tp_getattro@ */
3259   0,                                    /* @tp_setattro@ */
3260   0,                                    /* @tp_as_buffer@ */
3261   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
3262     Py_TPFLAGS_BASETYPE,
3263
3264   /* @tp_doc@ */
3265   "Shake128([perso = STR], [func = STR]): SHAKE128/cSHAKE128 XOF.",
3266
3267   0,                                    /* @tp_traverse@ */
3268   0,                                    /* @tp_clear@ */
3269   0,                                    /* @tp_richcompare@ */
3270   0,                                    /* @tp_weaklistoffset@ */
3271   0,                                    /* @tp_iter@ */
3272   0,                                    /* @tp_iternext@ */
3273   0,                                    /* @tp_methods@ */
3274   0,                                    /* @tp_members@ */
3275   0,                                    /* @tp_getset@ */
3276   0,                                    /* @tp_base@ */
3277   0,                                    /* @tp_dict@ */
3278   0,                                    /* @tp_descr_get@ */
3279   0,                                    /* @tp_descr_set@ */
3280   0,                                    /* @tp_dictoffset@ */
3281   0,                                    /* @tp_init@ */
3282   PyType_GenericAlloc,                  /* @tp_alloc@ */
3283   shake128_pynew,                       /* @tp_new@ */
3284   0,                                    /* @tp_free@ */
3285   0                                     /* @tp_is_gc@ */
3286 };
3287
3288 static PyTypeObject shake256_pytype_skel = {
3289   PyObject_HEAD_INIT(0) 0,              /* Header */
3290   "Shake256",                           /* @tp_name@ */
3291   0,                                    /* @tp_basicsize@ */
3292   0,                                    /* @tp_itemsize@ */
3293
3294   0,                                    /* @tp_dealloc@ */
3295   0,                                    /* @tp_print@ */
3296   0,                                    /* @tp_getattr@ */
3297   0,                                    /* @tp_setattr@ */
3298   0,                                    /* @tp_compare@ */
3299   0,                                    /* @tp_repr@ */
3300   0,                                    /* @tp_as_number@ */
3301   0,                                    /* @tp_as_sequence@ */
3302   0,                                    /* @tp_as_mapping@ */
3303   0,                                    /* @tp_hash@ */
3304   0,                                    /* @tp_call@ */
3305   0,                                    /* @tp_str@ */
3306   0,                                    /* @tp_getattro@ */
3307   0,                                    /* @tp_setattro@ */
3308   0,                                    /* @tp_as_buffer@ */
3309   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
3310     Py_TPFLAGS_BASETYPE,
3311
3312   /* @tp_doc@ */
3313   "Shake256([perso = STR], [func = STR]): SHAKE256/cSHAKE256 XOF.",
3314
3315   0,                                    /* @tp_traverse@ */
3316   0,                                    /* @tp_clear@ */
3317   0,                                    /* @tp_richcompare@ */
3318   0,                                    /* @tp_weaklistoffset@ */
3319   0,                                    /* @tp_iter@ */
3320   0,                                    /* @tp_iternext@ */
3321   0,                                    /* @tp_methods@ */
3322   0,                                    /* @tp_members@ */
3323   0,                                    /* @tp_getset@ */
3324   0,                                    /* @tp_base@ */
3325   0,                                    /* @tp_dict@ */
3326   0,                                    /* @tp_descr_get@ */
3327   0,                                    /* @tp_descr_set@ */
3328   0,                                    /* @tp_dictoffset@ */
3329   0,                                    /* @tp_init@ */
3330   PyType_GenericAlloc,                  /* @tp_alloc@ */
3331   shake256_pynew,                       /* @tp_new@ */
3332   0,                                    /* @tp_free@ */
3333   0                                     /* @tp_is_gc@ */
3334 };
3335
3336 /*----- Pseudorandom permutations -----------------------------------------*/
3337
3338 static PyTypeObject *gcprp_pytype, *gprp_pytype;
3339
3340 typedef struct prpinfo {
3341   const char *name;
3342   const octet *keysz;
3343   size_t ctxsz;
3344   size_t blksz;
3345   void (*init)(void *, const void *, size_t);
3346   void (*eblk)(void *, const void *, void *);
3347   void (*dblk)(void *, const void *, void *);
3348 } prpinfo;
3349
3350 #define PRP_DEF(PRE, pre)                                               \
3351   static void pre##_prpinit(void *ctx, const void *k, size_t ksz)       \
3352     { pre##_init(ctx, k, ksz); }                                        \
3353   static void pre##_prpeblk(void *ctx, const void *in, void *out)       \
3354   {                                                                     \
3355     uint32 w[PRE##_BLKSZ/4]; BLKC_LOAD(PRE, w, in);                     \
3356     pre##_eblk(ctx, w, w); BLKC_STORE(PRE, out, w);                     \
3357   }                                                                     \
3358   static void pre##_prpdblk(void *ctx, const void *in, void *out)       \
3359   {                                                                     \
3360     uint32 w[PRE##_BLKSZ/4]; BLKC_LOAD(PRE, w, in);                     \
3361     pre##_dblk(ctx, w, w); BLKC_STORE(PRE, out, w);                     \
3362   }                                                                     \
3363   static const prpinfo pre##_prpinfo = {                                \
3364     #pre, pre##_keysz, sizeof(pre##_ctx), PRE##_BLKSZ,                  \
3365     pre##_prpinit, pre##_prpeblk, pre##_prpdblk                         \
3366   };
3367 PRPS(PRP_DEF)
3368
3369 static const struct prpinfo *const gprptab[] = {
3370 #define PRP_ENTRY(PRE, pre) &pre##_prpinfo,
3371   PRPS(PRP_ENTRY)
3372   0
3373 };
3374
3375 typedef struct gcprp_pyobj {
3376   PyHeapTypeObject ty;
3377   const prpinfo *prp;
3378 } gcprp_pyobj;
3379 #define GCPRP_PRP(o) (((gcprp_pyobj *)(o))->prp)
3380
3381 typedef struct gprp_pyobj {
3382   PyObject_HEAD
3383   const prpinfo *prp;
3384 } gprp_pyobj;
3385 #define GPRP_PRP(o) (((gprp_pyobj *)(o))->prp)
3386 #define GPRP_CTX(o) (((gprp_pyobj *)(o)) + 1)
3387
3388 typedef struct prp {
3389   const prpinfo *prp;
3390   void *ctx;
3391 } prp;
3392
3393 static PyObject *gprp_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
3394 {
3395   static const char *const kwlist[] = { "key", 0 };
3396   char *k;
3397   Py_ssize_t sz;
3398   const prpinfo *prp = GCPRP_PRP(ty);
3399   PyObject *me;
3400
3401   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &k, &sz))
3402     goto end;
3403   if (keysz(sz, prp->keysz) != sz) VALERR("bad key length");
3404   me = (PyObject *)ty->tp_alloc(ty, 0);
3405   GPRP_PRP(me) = prp;
3406   prp->init(GPRP_CTX(me), k, sz);
3407   Py_INCREF(me);
3408   return (me);
3409 end:
3410   return (0);
3411 }
3412
3413 static void gprp_pydealloc(PyObject *me)
3414   { Py_DECREF(me->ob_type); FREEOBJ(me); }
3415
3416 static PyObject *gcprp_pywrap(const prpinfo *prp)
3417 {
3418   gcprp_pyobj *g = newtype(gcprp_pytype, 0, prp->name);
3419   g->prp = prp;
3420   g->ty.ht_type.tp_basicsize = sizeof(gprp_pyobj) + prp->ctxsz;
3421   g->ty.ht_type.tp_base = gprp_pytype;
3422   Py_INCREF(gprp_pytype);
3423   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
3424                             Py_TPFLAGS_BASETYPE |
3425                             Py_TPFLAGS_HEAPTYPE);
3426   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
3427   g->ty.ht_type.tp_free = 0;
3428   g->ty.ht_type.tp_new = gprp_pynew;
3429   typeready(&g->ty.ht_type);
3430   return ((PyObject *)g);
3431 }
3432
3433 static PyObject *gcpget_name(PyObject *me, void *hunoz)
3434   { return (PyString_FromString(GCPRP_PRP(me)->name)); }
3435 static PyObject *gcpget_keysz(PyObject *me, void *hunoz)
3436   { return (keysz_pywrap(GCPRP_PRP(me)->keysz)); }
3437 static PyObject *gcpget_blksz(PyObject *me, void *hunoz)
3438   { return (PyInt_FromLong(GCPRP_PRP(me)->blksz)); }
3439
3440 static PyObject *gpmeth_encrypt(PyObject *me, PyObject *arg)
3441 {
3442   char *p;
3443   Py_ssize_t n;
3444   PyObject *rc = 0;
3445
3446   if (!PyArg_ParseTuple(arg, "s#:encrypt", &p, &n)) goto end;
3447   if (n != GPRP_PRP(me)->blksz) VALERR("incorrect block length");
3448   rc = bytestring_pywrap(0, n);
3449   GPRP_PRP(me)->eblk(GPRP_CTX(me), p, PyString_AS_STRING(rc));
3450 end:
3451   return (rc);
3452 }
3453
3454 static PyObject *gpmeth_decrypt(PyObject *me, PyObject *arg)
3455 {
3456   char *p;
3457   Py_ssize_t n;
3458   PyObject *rc = 0;
3459
3460   if (!PyArg_ParseTuple(arg, "s#:decrypt", &p, &n)) goto end;
3461   if (n != GPRP_PRP(me)->blksz) VALERR("incorrect block length");
3462   rc = bytestring_pywrap(0, n);
3463   GPRP_PRP(me)->dblk(GPRP_CTX(me), p, PyString_AS_STRING(rc));
3464 end:
3465   return (rc);
3466 }
3467
3468 static PyGetSetDef gcprp_pygetset[] = {
3469 #define GETSETNAME(op, name) gcp##op##_##name
3470   GET   (keysz,         "CP.keysz -> acceptable key sizes")
3471   GET   (blksz,         "CP.blksz -> block size")
3472   GET   (name,          "CP.name -> name of this kind of PRP")
3473 #undef GETSETNAME
3474   { 0 }
3475 };
3476
3477 static PyMethodDef gprp_pymethods[] = {
3478 #define METHNAME(name) gpmeth_##name
3479   METH  (encrypt,       "P.encrypt(PT) -> CT")
3480   METH  (decrypt,       "P.decrypt(CT) -> PT")
3481 #undef METHNAME
3482   { 0 }
3483 };
3484
3485 static PyTypeObject gcprp_pytype_skel = {
3486   PyObject_HEAD_INIT(0) 0,              /* Header */
3487   "GCPRP",                              /* @tp_name@ */
3488   sizeof(gcprp_pyobj),                  /* @tp_basicsize@ */
3489   0,                                    /* @tp_itemsize@ */
3490
3491   0,                                    /* @tp_dealloc@ */
3492   0,                                    /* @tp_print@ */
3493   0,                                    /* @tp_getattr@ */
3494   0,                                    /* @tp_setattr@ */
3495   0,                                    /* @tp_compare@ */
3496   0,                                    /* @tp_repr@ */
3497   0,                                    /* @tp_as_number@ */
3498   0,                                    /* @tp_as_sequence@ */
3499   0,                                    /* @tp_as_mapping@ */
3500   0,                                    /* @tp_hash@ */
3501   0,                                    /* @tp_call@ */
3502   0,                                    /* @tp_str@ */
3503   0,                                    /* @tp_getattro@ */
3504   0,                                    /* @tp_setattro@ */
3505   0,                                    /* @tp_as_buffer@ */
3506   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
3507     Py_TPFLAGS_BASETYPE,
3508
3509   /* @tp_doc@ */
3510   "Pseudorandom permutation metaclass.",
3511
3512   0,                                    /* @tp_traverse@ */
3513   0,                                    /* @tp_clear@ */
3514   0,                                    /* @tp_richcompare@ */
3515   0,                                    /* @tp_weaklistoffset@ */
3516   0,                                    /* @tp_iter@ */
3517   0,                                    /* @tp_iternext@ */
3518   0,                                    /* @tp_methods@ */
3519   0,                                    /* @tp_members@ */
3520   gcprp_pygetset,                       /* @tp_getset@ */
3521   0,                                    /* @tp_base@ */
3522   0,                                    /* @tp_dict@ */
3523   0,                                    /* @tp_descr_get@ */
3524   0,                                    /* @tp_descr_set@ */
3525   0,                                    /* @tp_dictoffset@ */
3526   0,                                    /* @tp_init@ */
3527   PyType_GenericAlloc,                  /* @tp_alloc@ */
3528   abstract_pynew,                       /* @tp_new@ */
3529   0,                                    /* @tp_free@ */
3530   0                                     /* @tp_is_gc@ */
3531 };
3532
3533 static PyTypeObject gprp_pytype_skel = {
3534   PyObject_HEAD_INIT(0) 0,              /* Header */
3535   "GPRP",                               /* @tp_name@ */
3536   sizeof(gprp_pyobj),                   /* @tp_basicsize@ */
3537   0,                                    /* @tp_itemsize@ */
3538
3539   gprp_pydealloc,                       /* @tp_dealloc@ */
3540   0,                                    /* @tp_print@ */
3541   0,                                    /* @tp_getattr@ */
3542   0,                                    /* @tp_setattr@ */
3543   0,                                    /* @tp_compare@ */
3544   0,                                    /* @tp_repr@ */
3545   0,                                    /* @tp_as_number@ */
3546   0,                                    /* @tp_as_sequence@ */
3547   0,                                    /* @tp_as_mapping@ */
3548   0,                                    /* @tp_hash@ */
3549   0,                                    /* @tp_call@ */
3550   0,                                    /* @tp_str@ */
3551   0,                                    /* @tp_getattro@ */
3552   0,                                    /* @tp_setattro@ */
3553   0,                                    /* @tp_as_buffer@ */
3554   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
3555     Py_TPFLAGS_BASETYPE,
3556
3557   /* @tp_doc@ */
3558   "Pseudorandom permutation, abstract base class.",
3559
3560   0,                                    /* @tp_traverse@ */
3561   0,                                    /* @tp_clear@ */
3562   0,                                    /* @tp_richcompare@ */
3563   0,                                    /* @tp_weaklistoffset@ */
3564   0,                                    /* @tp_iter@ */
3565   0,                                    /* @tp_iternext@ */
3566   gprp_pymethods,                       /* @tp_methods@ */
3567   0,                                    /* @tp_members@ */
3568   0,                                    /* @tp_getset@ */
3569   0,                                    /* @tp_base@ */
3570   0,                                    /* @tp_dict@ */
3571   0,                                    /* @tp_descr_get@ */
3572   0,                                    /* @tp_descr_set@ */
3573   0,                                    /* @tp_dictoffset@ */
3574   0,                                    /* @tp_init@ */
3575   PyType_GenericAlloc,                  /* @tp_alloc@ */
3576   abstract_pynew,                       /* @tp_new@ */
3577   0,                                    /* @tp_free@ */
3578   0                                     /* @tp_is_gc@ */
3579 };
3580
3581 /*----- Main code ---------------------------------------------------------*/
3582
3583 static PyMethodDef methods[] = {
3584 #define METHNAME(func) meth_##func
3585   METH  (_KeySZ_fromdl, "fromdl(N) -> M: "
3586                     "convert integer discrete log field size to work factor")
3587   METH  (_KeySZ_fromschnorr, "fromschnorr(N) -> M: "
3588                                 "convert Schnorr group order to work factor")
3589   METH  (_KeySZ_fromif, "fromif(N) -> M: "
3590                  "convert integer factorization problem size to work factor")
3591   METH  (_KeySZ_fromec, "fromec(N) -> M: "
3592                          "convert elliptic curve group order to work factor")
3593   METH  (_KeySZ_todl,   "todl(N) -> M: "
3594                     "convert work factor to integer discrete log field size")
3595   METH  (_KeySZ_toschnorr, "toschnorr(N) -> M: "
3596                                 "convert work factor to Schnorr group order")
3597   METH  (_KeySZ_toif,   "toif(N) -> M: "
3598                  "convert work factor to integer factorization problem size")
3599   METH  (_KeySZ_toec,   "toec(N) -> M: "
3600                          "convert work factor to elliptic curve group order")
3601   METH  (_KeySZ_toec,   "toec(N) -> M: "
3602                          "convert work factor to elliptic curve group order")
3603 #define METH_HDANCE(hdance, HDance) METH(hdance##_prf,                  \
3604          "" #hdance "_prf(K, N) -> H: calculate " HDance " hash of N with K")
3605   METH_HDANCE(hsalsa20, "HSalsa20")
3606   METH_HDANCE(hsalsa2012, "HSalsa20/12")
3607   METH_HDANCE(hsalsa208, "HSalsa20/8")
3608   METH_HDANCE(hchacha20, "HChaCha20")
3609   METH_HDANCE(hchacha12, "HChaCha12")
3610   METH_HDANCE(hchacha8, "HChaCha8")
3611 #undef METH_DANCE
3612 #undef METHNAME
3613   { 0 }
3614 };
3615
3616 void algorithms_pyinit(void)
3617 {
3618   INITTYPE(keysz, root);
3619   INITTYPE(keyszany, keysz);
3620   INITTYPE(keyszrange, keysz);
3621   INITTYPE(keyszset, keysz);
3622   INITTYPE(gccipher, type);
3623   INITTYPE(gcipher, root);
3624   INITTYPE(gcaead, type);
3625   INITTYPE(gaeadkey, root);
3626   INITTYPE(gcaeadaad, type);
3627   INITTYPE(gaeadaad, root);
3628   INITTYPE(gcaeadenc, type);
3629   INITTYPE(gaeadenc, root);
3630   INITTYPE(gcaeaddec, type);
3631   INITTYPE(gaeaddec, root);
3632   INITTYPE(gchash, type);
3633   INITTYPE(ghash, root);
3634   INITTYPE(gcmac, type);
3635   INITTYPE(gmac, type);
3636   INITTYPE(gmhash, ghash);
3637   INITTYPE(poly1305cls, type);
3638   INITTYPE_META(poly1305key, type, poly1305cls);
3639   INITTYPE(poly1305hash, root);
3640   INITTYPE(kxvik, root);
3641   INITTYPE(shake, root);
3642   INITTYPE(shake128, shake);
3643   INITTYPE(shake256, shake);
3644   INITTYPE(gcprp, type);
3645   INITTYPE(gprp, root);
3646   addmethods(methods);
3647 }
3648
3649 GEN(gcciphers, cipher)
3650 GEN(gcaeads, aead)
3651 GEN(gchashes, hash)
3652 GEN(gcmacs, mac)
3653 #define gcprp prpinfo
3654 GEN(gcprps, prp)
3655
3656 void algorithms_pyinsert(PyObject *mod)
3657 {
3658   PyObject *d;
3659   INSERT("KeySZ", keysz_pytype);
3660   INSERT("KeySZAny", keyszany_pytype);
3661   INSERT("KeySZRange", keyszrange_pytype);
3662   INSERT("KeySZSet", keyszset_pytype);
3663   INSERT("GCCipher", gccipher_pytype);
3664   INSERT("GCipher", gcipher_pytype);
3665   INSERT("gcciphers", gcciphers());
3666   INSERT("GCAEAD", gcaead_pytype);
3667   INSERT("GAEKey", gaeadkey_pytype);
3668   INSERT("GAEAADClass", gcaeadaad_pytype);
3669   INSERT("GAEAAD", gaeadaad_pytype);
3670   INSERT("GAEEncClass", gcaeadenc_pytype);
3671   INSERT("GAEEnc", gaeadenc_pytype);
3672   INSERT("GAEDecClass", gcaeaddec_pytype);
3673   INSERT("GAEDec", gaeaddec_pytype);
3674   INSERT("gcaeads", gcaeads());
3675   INSERT("GCHash", gchash_pytype);
3676   INSERT("GHash", ghash_pytype);
3677   INSERT("gchashes", d = gchashes());
3678   sha_pyobj = PyDict_GetItemString(d, "sha"); Py_INCREF(sha_pyobj);
3679   has160_pyobj = PyDict_GetItemString(d, "has160"); Py_INCREF(has160_pyobj);
3680   INSERT("GCMAC", gcmac_pytype);
3681   INSERT("GMAC", gmac_pytype);
3682   INSERT("GMACHash", gmhash_pytype);
3683   INSERT("gcmacs", gcmacs());
3684   INSERT("Poly1305Class", poly1305cls_pytype);
3685   INSERT("poly1305", poly1305key_pytype);
3686   INSERT("Poly1305Hash", poly1305hash_pytype);
3687   INSERT("Keccak1600", kxvik_pytype);
3688   INSERT("Shake", shake_pytype);
3689   INSERT("Shake128", shake128_pytype);
3690   INSERT("Shake256", shake256_pytype);
3691   INSERT("GCPRP", gcprp_pytype);
3692   INSERT("GPRP", gprp_pytype);
3693   INSERT("gcprps", gcprps());
3694 }
3695
3696 /*----- That's all, folks -------------------------------------------------*/