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 #include "algorithms.h"
  31
  32 /*----- Key sizes ---------------------------------------------------------*/
  33
  34 PyTypeObject *keysz_pytype;
  35 PyTypeObject *keyszany_pytype, *keyszrange_pytype, *keyszset_pytype;
  36 PyObject *sha_pyobj, *has160_pyobj;
  37
  38 #ifndef KSZ_OPMASK
  39 #  define KSZ_OPMASK 0x1f
  40 #endif
  41
  42 #ifndef KSZ_16BIT
  43 #  define KSZ_16BIT 0x20
  44 #endif
  45
  46 PyObject *keysz_pywrap(const octet *k)
  47 {
  48   unsigned op = *k++;
  49 #define ARG(i) (op&KSZ_16BIT ? LOAD16(k + 2*(i)) : k[i])
  50   switch (op&KSZ_OPMASK) {
  51     case KSZ_ANY: {
  52       keysz_pyobj *o = PyObject_New(keysz_pyobj, keyszany_pytype);
  53       o->dfl = ARG(0);
  54       return ((PyObject *)o);
  55     } break;
  56     case KSZ_RANGE: {
  57       keyszrange_pyobj *o =
  58         PyObject_New(keyszrange_pyobj, keyszrange_pytype);
  59       o->dfl = ARG(0);
  60       o->min = ARG(1);
  61       o->max = ARG(2);
  62       o->mod = ARG(3);
  63       if (!o->mod) o->mod = 1;
  64       return ((PyObject *)o);
  65     } break;
  66     case KSZ_SET: {
  67       keyszset_pyobj *o =
  68         PyObject_New(keyszset_pyobj, keyszset_pytype);
  69       int i, n;
  70       o->dfl = ARG(0);
  71       for (i = 0; ARG(i); i++) ;
  72       n = i; o->set = PyTuple_New(n);
  73       for (i = 0; i < n; i++)
  74         PyTuple_SET_ITEM(o->set, i, PyInt_FromLong(ARG(i)));
  75       return ((PyObject *)o);
  76     } break;
  77     default:
  78       abort();
  79   }
  80 #undef ARG
  81 }
  82
  83 static PyObject *keyszany_pynew(PyTypeObject *ty,
  84                                 PyObject *arg, PyObject *kw)
  85 {
  86   static const char *const kwlist[] = { "default", 0 };
  87   int dfl;
  88   keysz_pyobj *o;
  89
  90   if (!PyArg_ParseTupleAndKeywords(arg, kw, "i:new", KWLIST, &dfl))
  91     goto end;
  92   if (dfl < 0) VALERR("key size cannot be negative");
  93   o = (keysz_pyobj *)ty->tp_alloc(ty, 0);
  94   o->dfl = dfl;
  95   return ((PyObject *)o);
  96 end:
  97   return (0);
  98 }
  99
 100 static PyObject *keyszrange_pynew(PyTypeObject *ty,
 101                                   PyObject *arg, PyObject *kw)
 102 {
 103   static const char *const kwlist[] = { "default", "min", "max", "mod", 0 };
 104   int dfl, min = 0, max = 0, mod = 1;
 105   keyszrange_pyobj *o;
 106
 107   if (!PyArg_ParseTupleAndKeywords(arg, kw, "i|iii:new", KWLIST,
 108                                    &dfl, &min, &max, &mod))
 109     goto end;
 110   if (dfl < 0 || min < 0) VALERR("key size cannot be negative");
 111   if (min > dfl || (max && dfl > max)) VALERR("bad key size bounds");
 112   if (mod <= 0 || dfl%mod || min%mod || max%mod)
 113     VALERR("bad key size modulus");
 114   o = (keyszrange_pyobj *)ty->tp_alloc(ty, 0);
 115   o->dfl = dfl;
 116   o->min = min;
 117   o->max = max;
 118   o->mod = mod;
 119   return ((PyObject *)o);
 120 end:
 121   return (0);
 122 }
 123
 124 static PyObject *keyszset_pynew(PyTypeObject *ty,
 125                                 PyObject *arg, PyObject *kw)
 126 {
 127   static const char *const kwlist[] = { "default", "set", 0 };
 128   int dfl, i, n, xx;
 129   PyObject *set = 0;
 130   PyObject *x = 0, *l = 0;
 131   keyszset_pyobj *o = 0;
 132
 133   if (!PyArg_ParseTupleAndKeywords(arg, kw, "i|O:new", KWLIST, &dfl, &set))
 134     goto end;
 135   if (!set) set = PyTuple_New(0);
 136   else Py_INCREF(set);
 137   if (!PySequence_Check(set)) TYERR("want a sequence");
 138   n = PySequence_Size(set);
 139   l = PyList_New(0);
 140   if (PyErr_Occurred()) goto end;
 141   if (dfl < 0) VALERR("key size cannot be negative");
 142   x = PyInt_FromLong(dfl);
 143   PyList_Append(l, x);
 144   Py_DECREF(x);
 145   x = 0;
 146   for (i = 0; i < n; i++) {
 147     if ((x = PySequence_GetItem(set, i)) == 0) goto end;
 148     xx = PyInt_AsLong(x);
 149     if (PyErr_Occurred()) goto end;
 150     if (xx == dfl) continue;
 151     if (xx < 0) VALERR("key size cannot be negative");
 152     PyList_Append(l, x);
 153     Py_DECREF(x);
 154     x = 0;
 155   }
 156   Py_DECREF(set);
 157   if ((set = PySequence_Tuple(l)) == 0) goto end;
 158   o = (keyszset_pyobj *)ty->tp_alloc(ty, 0);
 159   o->dfl = dfl;
 160   o->set = set;
 161   Py_INCREF(set);
 162 end:
 163   Py_XDECREF(set);
 164   Py_XDECREF(l);
 165   Py_XDECREF(x);
 166   return ((PyObject *)o);
 167 }
 168
 169 static PyObject *kaget_min(PyObject *me, void *hunoz)
 170   { return (PyInt_FromLong(0)); }
 171 #define kaget_max kaget_min
 172
 173 static PyObject *ksget_min(PyObject *me, void *hunoz)
 174 {
 175   PyObject *set = ((keyszset_pyobj *)me)->set;
 176   int i, n, y, x = -1;
 177   n = PyTuple_Size(set);
 178   for (i = 0; i < n; i++) {
 179     y = PyInt_AsLong(PyTuple_GetItem(set, i));
 180     if (x == -1 || y < x) x = y;
 181   }
 182   return (PyInt_FromLong(x));
 183 }
 184
 185 static PyObject *ksget_max(PyObject *me, void *hunoz)
 186 {
 187   PyObject *set = ((keyszset_pyobj *)me)->set;
 188   int i, n, y, x = -1;
 189   n = PyTuple_Size(set);
 190   for (i = 0; i < n; i++) {
 191     y = PyInt_AsLong(PyTuple_GetItem(set, i));
 192     if (y > x) x = y;
 193   }
 194   return (PyInt_FromLong(x));
 195 }
 196
 197 static PyMemberDef keysz_pymembers[] = {
 198 #define MEMBERSTRUCT keysz_pyobj
 199 #define default dfl /* ugh! */
 200   MEMBER(default, T_INT, READONLY, "KSZ.default -> default key size")
 201 #undef default
 202 #undef MEMBERSTRUCT
 203   { 0 }
 204 };
 205
 206 static PyGetSetDef keyszany_pygetset[] = {
 207 #define GETSETNAME(op, name) ka##op##_##name
 208   GET   (min,                   "KSZ.min -> smallest allowed key size")
 209   GET   (max,                   "KSZ.min -> largest allowed key size")
 210 #undef GETSETNAME
 211   { 0 }
 212 };
 213
 214 static PyMemberDef keyszrange_pymembers[] = {
 215 #define MEMBERSTRUCT keyszrange_pyobj
 216   MEMBER(min, T_INT, READONLY,  "KSZ.min -> smallest allowed key size")
 217   MEMBER(max, T_INT, READONLY,  "KSZ.min -> largest allowed key size")
 218   MEMBER(mod, T_INT, READONLY,
 219          "KSZ.mod -> key size must be a multiple of this")
 220 #undef MEMBERSTRUCT
 221   { 0 }
 222 };
 223
 224 static PyGetSetDef keyszset_pygetset[] = {
 225 #define GETSETNAME(op, name) ks##op##_##name
 226   GET   (min,                   "KSZ.min -> smallest allowed key size")
 227   GET   (max,                   "KSZ.min -> largest allowed key size")
 228 #undef GETSETNAME
 229   { 0 }
 230 };
 231
 232 static PyMemberDef keyszset_pymembers[] = {
 233 #define MEMBERSTRUCT keyszset_pyobj
 234   MEMBER(set, T_OBJECT, READONLY,       "KSZ.set -> allowed key sizes")
 235 #undef MEMBERSTRUCT
 236   { 0 }
 237 };
 238
 239 static PyTypeObject keysz_pytype_skel = {
 240   PyObject_HEAD_INIT(0) 0,              /* Header */
 241   "KeySZ",                              /* @tp_name@ */
 242   sizeof(keysz_pyobj),                  /* @tp_basicsize@ */
 243   0,                                    /* @tp_itemsize@ */
 244
 245   0,                                    /* @tp_dealloc@ */
 246   0,                                    /* @tp_print@ */
 247   0,                                    /* @tp_getattr@ */
 248   0,                                    /* @tp_setattr@ */
 249   0,                                    /* @tp_compare@ */
 250   0,                                    /* @tp_repr@ */
 251   0,                                    /* @tp_as_number@ */
 252   0,                                    /* @tp_as_sequence@ */
 253   0,                                    /* @tp_as_mapping@ */
 254   0,                                    /* @tp_hash@ */
 255   0,                                    /* @tp_call@ */
 256   0,                                    /* @tp_str@ */
 257   0,                                    /* @tp_getattro@ */
 258   0,                                    /* @tp_setattro@ */
 259   0,                                    /* @tp_as_buffer@ */
 260   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 261     Py_TPFLAGS_BASETYPE,
 262
 263   /* @tp_doc@ */
 264 "Key size constraints.  Abstract.",
 265
 266   0,                                    /* @tp_traverse@ */
 267   0,                                    /* @tp_clear@ */
 268   0,                                    /* @tp_richcompare@ */
 269   0,                                    /* @tp_weaklistoffset@ */
 270   0,                                    /* @tp_iter@ */
 271   0,                                    /* @tp_iternext@ */
 272   0,                                    /* @tp_methods@ */
 273   keysz_pymembers,                      /* @tp_members@ */
 274   0,                                    /* @tp_getset@ */
 275   0,                                    /* @tp_base@ */
 276   0,                                    /* @tp_dict@ */
 277   0,                                    /* @tp_descr_get@ */
 278   0,                                    /* @tp_descr_set@ */
 279   0,                                    /* @tp_dictoffset@ */
 280   0,                                    /* @tp_init@ */
 281   PyType_GenericAlloc,                  /* @tp_alloc@ */
 282   abstract_pynew,                       /* @tp_new@ */
 283   0,                                    /* @tp_free@ */
 284   0                                     /* @tp_is_gc@ */
 285 };
 286
 287 static PyTypeObject keyszany_pytype_skel = {
 288   PyObject_HEAD_INIT(0) 0,              /* Header */
 289   "KeySZAny",                           /* @tp_name@ */
 290   sizeof(keysz_pyobj),                  /* @tp_basicsize@ */
 291   0,                                    /* @tp_itemsize@ */
 292
 293   0,                                    /* @tp_dealloc@ */
 294   0,                                    /* @tp_print@ */
 295   0,                                    /* @tp_getattr@ */
 296   0,                                    /* @tp_setattr@ */
 297   0,                                    /* @tp_compare@ */
 298   0,                                    /* @tp_repr@ */
 299   0,                                    /* @tp_as_number@ */
 300   0,                                    /* @tp_as_sequence@ */
 301   0,                                    /* @tp_as_mapping@ */
 302   0,                                    /* @tp_hash@ */
 303   0,                                    /* @tp_call@ */
 304   0,                                    /* @tp_str@ */
 305   0,                                    /* @tp_getattro@ */
 306   0,                                    /* @tp_setattro@ */
 307   0,                                    /* @tp_as_buffer@ */
 308   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 309     Py_TPFLAGS_BASETYPE,
 310
 311   /* @tp_doc@ */
 312 "KeySZAny(DEFAULT)\n\
 313   Key size constraints.  This object imposes no constraints on size.",
 314
 315   0,                                    /* @tp_traverse@ */
 316   0,                                    /* @tp_clear@ */
 317   0,                                    /* @tp_richcompare@ */
 318   0,                                    /* @tp_weaklistoffset@ */
 319   0,                                    /* @tp_iter@ */
 320   0,                                    /* @tp_iternext@ */
 321   0,                                    /* @tp_methods@ */
 322   0,                                    /* @tp_members@ */
 323   keyszany_pygetset,                    /* @tp_getset@ */
 324   0,                                    /* @tp_base@ */
 325   0,                                    /* @tp_dict@ */
 326   0,                                    /* @tp_descr_get@ */
 327   0,                                    /* @tp_descr_set@ */
 328   0,                                    /* @tp_dictoffset@ */
 329   0,                                    /* @tp_init@ */
 330   PyType_GenericAlloc,                  /* @tp_alloc@ */
 331   keyszany_pynew,                       /* @tp_new@ */
 332   0,                                    /* @tp_free@ */
 333   0                                     /* @tp_is_gc@ */
 334 };
 335
 336 static PyTypeObject keyszrange_pytype_skel = {
 337   PyObject_HEAD_INIT(0) 0,              /* Header */
 338   "KeySZRange",                         /* @tp_name@ */
 339   sizeof(keyszrange_pyobj),             /* @tp_basicsize@ */
 340   0,                                    /* @tp_itemsize@ */
 341
 342   0,                                    /* @tp_dealloc@ */
 343   0,                                    /* @tp_print@ */
 344   0,                                    /* @tp_getattr@ */
 345   0,                                    /* @tp_setattr@ */
 346   0,                                    /* @tp_compare@ */
 347   0,                                    /* @tp_repr@ */
 348   0,                                    /* @tp_as_number@ */
 349   0,                                    /* @tp_as_sequence@ */
 350   0,                                    /* @tp_as_mapping@ */
 351   0,                                    /* @tp_hash@ */
 352   0,                                    /* @tp_call@ */
 353   0,                                    /* @tp_str@ */
 354   0,                                    /* @tp_getattro@ */
 355   0,                                    /* @tp_setattro@ */
 356   0,                                    /* @tp_as_buffer@ */
 357   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 358     Py_TPFLAGS_BASETYPE,
 359
 360   /* @tp_doc@ */
 361 "KeySZRange(DEFAULT, [min = 0], [max = 0], [mod = 1])\n\
 362   Key size constraints.  Key size must be between MIN and MAX inclusive,\n\
 363   and be a multiple of MOD.",
 364
 365   0,                                    /* @tp_traverse@ */
 366   0,                                    /* @tp_clear@ */
 367   0,                                    /* @tp_richcompare@ */
 368   0,                                    /* @tp_weaklistoffset@ */
 369   0,                                    /* @tp_iter@ */
 370   0,                                    /* @tp_iternext@ */
 371   0,                                    /* @tp_methods@ */
 372   keyszrange_pymembers,                 /* @tp_members@ */
 373   0,                                    /* @tp_getset@ */
 374   0,                                    /* @tp_base@ */
 375   0,                                    /* @tp_dict@ */
 376   0,                                    /* @tp_descr_get@ */
 377   0,                                    /* @tp_descr_set@ */
 378   0,                                    /* @tp_dictoffset@ */
 379   0,                                    /* @tp_init@ */
 380   PyType_GenericAlloc,                  /* @tp_alloc@ */
 381   keyszrange_pynew,                     /* @tp_new@ */
 382   0,                                    /* @tp_free@ */
 383   0                                     /* @tp_is_gc@ */
 384 };
 385
 386 static PyTypeObject keyszset_pytype_skel = {
 387   PyObject_HEAD_INIT(0) 0,              /* Header */
 388   "KeySZSet",                           /* @tp_name@ */
 389   sizeof(keyszset_pyobj),               /* @tp_basicsize@ */
 390   0,                                    /* @tp_itemsize@ */
 391
 392   0,                                    /* @tp_dealloc@ */
 393   0,                                    /* @tp_print@ */
 394   0,                                    /* @tp_getattr@ */
 395   0,                                    /* @tp_setattr@ */
 396   0,                                    /* @tp_compare@ */
 397   0,                                    /* @tp_repr@ */
 398   0,                                    /* @tp_as_number@ */
 399   0,                                    /* @tp_as_sequence@ */
 400   0,                                    /* @tp_as_mapping@ */
 401   0,                                    /* @tp_hash@ */
 402   0,                                    /* @tp_call@ */
 403   0,                                    /* @tp_str@ */
 404   0,                                    /* @tp_getattro@ */
 405   0,                                    /* @tp_setattro@ */
 406   0,                                    /* @tp_as_buffer@ */
 407   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 408     Py_TPFLAGS_BASETYPE,
 409
 410   /* @tp_doc@ */
 411 "KeySZSet(DEFAULT, SEQ)\n\
 412   Key size constraints.  Key size must be DEFAULT or one in SEQ.",
 413
 414   0,                                    /* @tp_traverse@ */
 415   0,                                    /* @tp_clear@ */
 416   0,                                    /* @tp_richcompare@ */
 417   0,                                    /* @tp_weaklistoffset@ */
 418   0,                                    /* @tp_iter@ */
 419   0,                                    /* @tp_iternext@ */
 420   0,                                    /* @tp_methods@ */
 421   keyszset_pymembers,                   /* @tp_members@ */
 422   keyszset_pygetset,                    /* @tp_getset@ */
 423   0,                                    /* @tp_base@ */
 424   0,                                    /* @tp_dict@ */
 425   0,                                    /* @tp_descr_get@ */
 426   0,                                    /* @tp_descr_set@ */
 427   0,                                    /* @tp_dictoffset@ */
 428   0,                                    /* @tp_init@ */
 429   PyType_GenericAlloc,                  /* @tp_alloc@ */
 430   keyszset_pynew,                       /* @tp_new@ */
 431   0,                                    /* @tp_free@ */
 432   0                                     /* @tp_is_gc@ */
 433 };
 434
 435 #define KSZCONVOP(op)                                                   \
 436   static PyObject *meth__KeySZ_##op(PyObject *me, PyObject *arg)        \
 437   {                                                                     \
 438     double x, y;                                                        \
 439     if (!PyArg_ParseTuple(arg, "Od:" #op, &me, &x)) return (0);         \
 440     y = keysz_##op(x);                                                  \
 441     return (PyFloat_FromDouble(y));                                     \
 442   }
 443 KSZCONVOP(fromdl)
 444 KSZCONVOP(fromschnorr)
 445 KSZCONVOP(fromif)
 446 KSZCONVOP(fromec)
 447 KSZCONVOP(todl)
 448 KSZCONVOP(toschnorr)
 449 KSZCONVOP(toif)
 450 KSZCONVOP(toec)
 451 #undef KSZCONVOP
 452
 453 /*----- Symmetric encryption ----------------------------------------------*/
 454
 455 PyTypeObject *gccipher_pytype, *gcipher_pytype;
 456
 457 CONVFUNC(gccipher, gccipher *, GCCIPHER_CC)
 458 CONVFUNC(gcipher, gcipher *, GCIPHER_C)
 459
 460 PyObject *gcipher_pywrap(PyObject *cobj, gcipher *c)
 461 {
 462   gcipher_pyobj *g;
 463   if (!cobj) cobj = gccipher_pywrap((/*unconst*/ gccipher *)GC_CLASS(c));
 464   else Py_INCREF(cobj);
 465   g = PyObject_NEW(gcipher_pyobj, (PyTypeObject *)cobj);
 466   g->c = c;
 467   return ((PyObject *)g);
 468 }
 469
 470 static PyObject *gcipher_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
 471 {
 472   static const char *const kwlist[] = { "k", 0 };
 473   char *k;
 474   Py_ssize_t sz;
 475
 476   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &k, &sz))
 477     goto end;
 478   if (keysz(sz, GCCIPHER_CC(ty)->keysz) != sz) VALERR("bad key length");
 479   return (gcipher_pywrap((PyObject *)ty,
 480                          GC_INIT(GCCIPHER_CC(ty), k, sz)));
 481 end:
 482   return (0);
 483 }
 484
 485 PyObject *gccipher_pywrap(gccipher *cc)
 486 {
 487   gccipher_pyobj *g = newtype(gccipher_pytype, 0, cc->name);
 488   g->cc = cc;
 489   g->ty.ht_type.tp_basicsize = sizeof(gcipher_pyobj);
 490   g->ty.ht_type.tp_base = gcipher_pytype;
 491   Py_INCREF(gcipher_pytype);
 492   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
 493                             Py_TPFLAGS_BASETYPE |
 494                             Py_TPFLAGS_HEAPTYPE);
 495   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
 496   g->ty.ht_type.tp_free = 0;
 497   g->ty.ht_type.tp_new = gcipher_pynew;
 498   typeready(&g->ty.ht_type);
 499   return ((PyObject *)g);
 500 }
 501
 502 static void gcipher_pydealloc(PyObject *me)
 503 {
 504   GC_DESTROY(GCIPHER_C(me));
 505   Py_DECREF(me->ob_type);
 506   FREEOBJ(me);
 507 }
 508
 509 static PyObject *gccget_name(PyObject *me, void *hunoz)
 510   { return (PyString_FromString(GCCIPHER_CC(me)->name)); }
 511
 512 static PyObject *gccget_keysz(PyObject *me, void *hunoz)
 513   { return (keysz_pywrap(GCCIPHER_CC(me)->keysz)); }
 514
 515 static PyObject *gccget_blksz(PyObject *me, void *hunoz)
 516   { return (PyInt_FromLong(GCCIPHER_CC(me)->blksz)); }
 517
 518 static PyObject *gcmeth_encrypt(PyObject *me, PyObject *arg)
 519 {
 520   char *p;
 521   Py_ssize_t sz;
 522   PyObject *rc = 0;
 523
 524   if (!PyArg_ParseTuple(arg, "s#:encrypt", &p, &sz)) return (0);
 525   rc = bytestring_pywrap(0, sz);
 526   GC_ENCRYPT(GCIPHER_C(me), p, PyString_AS_STRING(rc), sz);
 527   return (rc);
 528 }
 529
 530 static PyObject *gcmeth_enczero(PyObject *me, PyObject *arg)
 531 {
 532   char *p;
 533   int sz;
 534   PyObject *rc = 0;
 535
 536   if (!PyArg_ParseTuple(arg, "i:enczero", &sz)) return (0);
 537   rc = bytestring_pywrap(0, sz);
 538   p = PyString_AS_STRING(rc);
 539   memset(p, 0, sz);
 540   GC_ENCRYPT(GCIPHER_C(me), p, p, sz);
 541   return (rc);
 542 }
 543
 544 static PyObject *gcmeth_decrypt(PyObject *me, PyObject *arg)
 545 {
 546   char *p;
 547   Py_ssize_t sz;
 548   PyObject *rc = 0;
 549
 550   if (!PyArg_ParseTuple(arg, "s#:decrypt", &p, &sz)) return (0);
 551   rc = bytestring_pywrap(0, sz);
 552   GC_DECRYPT(GCIPHER_C(me), p, PyString_AS_STRING(rc), sz);
 553   return (rc);
 554 }
 555
 556 static PyObject *gcmeth_deczero(PyObject *me, PyObject *arg)
 557 {
 558   char *p;
 559   int sz;
 560   PyObject *rc = 0;
 561
 562   if (!PyArg_ParseTuple(arg, "i:deczero", &sz)) return (0);
 563   rc = bytestring_pywrap(0, sz);
 564   p = PyString_AS_STRING(rc);
 565   memset(p, 0, sz);
 566   GC_DECRYPT(GCIPHER_C(me), p, p, sz);
 567   return (rc);
 568 }
 569
 570 static PyObject *gcmeth_setiv(PyObject *me, PyObject *arg)
 571 {
 572   char *p;
 573   Py_ssize_t sz;
 574
 575   if (!PyArg_ParseTuple(arg, "s#:setiv", &p, &sz)) goto end;
 576   if (!GCIPHER_C(me)->ops->setiv) VALERR("`setiv' not supported");
 577   if (!GC_CLASS(GCIPHER_C(me))->blksz) VALERR("not a block cipher mode");
 578   if (sz != GC_CLASS(GCIPHER_C(me))->blksz) VALERR("bad IV length");
 579   GC_SETIV(GCIPHER_C(me), p);
 580   RETURN_ME;
 581 end:
 582   return (0);
 583 }
 584
 585 static PyObject *gcmeth_bdry(PyObject *me, PyObject *arg)
 586 {
 587   if (!PyArg_ParseTuple(arg, ":bdry")) goto end;
 588   if (!GCIPHER_C(me)->ops->bdry) VALERR("`bdry' not supported");
 589   if (!GC_CLASS(GCIPHER_C(me))->blksz) VALERR("not a block cipher mode");
 590   GC_BDRY(GCIPHER_C(me));
 591   RETURN_ME;
 592 end:
 593   return (0);
 594 }
 595
 596 static PyGetSetDef gccipher_pygetset[] = {
 597 #define GETSETNAME(op, name) gcc##op##_##name
 598   GET   (keysz,                 "CC.keysz -> acceptable key sizes")
 599   GET   (blksz,                 "CC.blksz -> block size, or zero")
 600   GET   (name,                  "CC.name -> name of this kind of cipher")
 601 #undef GETSETNAME
 602   { 0 }
 603 };
 604
 605 static PyMethodDef gcipher_pymethods[] = {
 606 #define METHNAME(name) gcmeth_##name
 607   METH  (encrypt,               "C.encrypt(PT) -> CT")
 608   METH  (enczero,               "C.enczero(N) -> CT")
 609   METH  (decrypt,               "C.decrypt(CT) -> PT")
 610   METH  (deczero,               "C.deczero(N) -> PT")
 611   METH  (setiv,                 "C.setiv(IV)")
 612   METH  (bdry,                  "C.bdry()")
 613 #undef METHNAME
 614   { 0 }
 615 };
 616
 617 static PyTypeObject gccipher_pytype_skel = {
 618   PyObject_HEAD_INIT(0) 0,              /* Header */
 619   "GCCipher",                           /* @tp_name@ */
 620   sizeof(gccipher_pyobj),               /* @tp_basicsize@ */
 621   0,                                    /* @tp_itemsize@ */
 622
 623   0,                                    /* @tp_dealloc@ */
 624   0,                                    /* @tp_print@ */
 625   0,                                    /* @tp_getattr@ */
 626   0,                                    /* @tp_setattr@ */
 627   0,                                    /* @tp_compare@ */
 628   0,                                    /* @tp_repr@ */
 629   0,                                    /* @tp_as_number@ */
 630   0,                                    /* @tp_as_sequence@ */
 631   0,                                    /* @tp_as_mapping@ */
 632   0,                                    /* @tp_hash@ */
 633   0,                                    /* @tp_call@ */
 634   0,                                    /* @tp_str@ */
 635   0,                                    /* @tp_getattro@ */
 636   0,                                    /* @tp_setattro@ */
 637   0,                                    /* @tp_as_buffer@ */
 638   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 639     Py_TPFLAGS_BASETYPE,
 640
 641   /* @tp_doc@ */
 642 "Symmetric cipher metaclass.",
 643
 644   0,                                    /* @tp_traverse@ */
 645   0,                                    /* @tp_clear@ */
 646   0,                                    /* @tp_richcompare@ */
 647   0,                                    /* @tp_weaklistoffset@ */
 648   0,                                    /* @tp_iter@ */
 649   0,                                    /* @tp_iternext@ */
 650   0,                                    /* @tp_methods@ */
 651   0,                                    /* @tp_members@ */
 652   gccipher_pygetset,                    /* @tp_getset@ */
 653   0,                                    /* @tp_base@ */
 654   0,                                    /* @tp_dict@ */
 655   0,                                    /* @tp_descr_get@ */
 656   0,                                    /* @tp_descr_set@ */
 657   0,                                    /* @tp_dictoffset@ */
 658   0,                                    /* @tp_init@ */
 659   PyType_GenericAlloc,                  /* @tp_alloc@ */
 660   abstract_pynew,                       /* @tp_new@ */
 661   0,                                    /* @tp_free@ */
 662   0                                     /* @tp_is_gc@ */
 663 };
 664
 665 static PyTypeObject gcipher_pytype_skel = {
 666   PyObject_HEAD_INIT(0) 0,              /* Header */
 667   "GCipher",                            /* @tp_name@ */
 668   sizeof(gcipher_pyobj),                /* @tp_basicsize@ */
 669   0,                                    /* @tp_itemsize@ */
 670
 671   gcipher_pydealloc,                    /* @tp_dealloc@ */
 672   0,                                    /* @tp_print@ */
 673   0,                                    /* @tp_getattr@ */
 674   0,                                    /* @tp_setattr@ */
 675   0,                                    /* @tp_compare@ */
 676   0,                                    /* @tp_repr@ */
 677   0,                                    /* @tp_as_number@ */
 678   0,                                    /* @tp_as_sequence@ */
 679   0,                                    /* @tp_as_mapping@ */
 680   0,                                    /* @tp_hash@ */
 681   0,                                    /* @tp_call@ */
 682   0,                                    /* @tp_str@ */
 683   0,                                    /* @tp_getattro@ */
 684   0,                                    /* @tp_setattro@ */
 685   0,                                    /* @tp_as_buffer@ */
 686   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 687     Py_TPFLAGS_BASETYPE,
 688
 689   /* @tp_doc@ */
 690 "Symmetric cipher, abstract base class.",
 691
 692   0,                                    /* @tp_traverse@ */
 693   0,                                    /* @tp_clear@ */
 694   0,                                    /* @tp_richcompare@ */
 695   0,                                    /* @tp_weaklistoffset@ */
 696   0,                                    /* @tp_iter@ */
 697   0,                                    /* @tp_iternext@ */
 698   gcipher_pymethods,                    /* @tp_methods@ */
 699   0,                                    /* @tp_members@ */
 700   0,                                    /* @tp_getset@ */
 701   0,                                    /* @tp_base@ */
 702   0,                                    /* @tp_dict@ */
 703   0,                                    /* @tp_descr_get@ */
 704   0,                                    /* @tp_descr_set@ */
 705   0,                                    /* @tp_dictoffset@ */
 706   0,                                    /* @tp_init@ */
 707   PyType_GenericAlloc,                  /* @tp_alloc@ */
 708   abstract_pynew,                       /* @tp_new@ */
 709   0,                                    /* @tp_free@ */
 710   0                                     /* @tp_is_gc@ */
 711 };
 712
 713 /*----- Hash functions ----------------------------------------------------*/
 714
 715 PyTypeObject *gchash_pytype, *ghash_pytype;
 716
 717 CONVFUNC(gchash, gchash *, GCHASH_CH)
 718 CONVFUNC(ghash, ghash *, GHASH_H)
 719
 720 static PyObject *ghash_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
 721 {
 722   static const char *const kwlist[] = { 0 };
 723   if (!PyArg_ParseTupleAndKeywords(arg, kw, ":new", KWLIST))
 724     goto end;
 725   return (ghash_pywrap((PyObject *)ty, GH_INIT(GCHASH_CH(ty))));
 726 end:
 727   return (0);
 728 }
 729
 730 PyObject *gchash_pywrap(gchash *ch)
 731 {
 732   gchash_pyobj *g = newtype(gchash_pytype, 0, ch->name);
 733   g->ch = ch;
 734   g->ty.ht_type.tp_basicsize = sizeof(ghash_pyobj);
 735   g->ty.ht_type.tp_base = ghash_pytype;
 736   Py_INCREF(ghash_pytype);
 737   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
 738                             Py_TPFLAGS_BASETYPE |
 739                             Py_TPFLAGS_HEAPTYPE);
 740   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
 741   g->ty.ht_type.tp_free = 0;
 742   g->ty.ht_type.tp_new = ghash_pynew;
 743   typeready(&g->ty.ht_type);
 744   return ((PyObject *)g);
 745 }
 746
 747 PyObject *ghash_pywrap(PyObject *cobj, ghash *h)
 748 {
 749   ghash_pyobj *g;
 750   if (!cobj) cobj = gchash_pywrap((/*unconst*/ gchash *)GH_CLASS(h));
 751   else Py_INCREF(cobj);
 752   g = PyObject_NEW(ghash_pyobj, (PyTypeObject *)cobj);
 753   g->h = h;
 754   return ((PyObject *)g);
 755 }
 756
 757 static void ghash_pydealloc(PyObject *me)
 758 {
 759   GH_DESTROY(GHASH_H(me));
 760   Py_DECREF(me->ob_type);
 761   FREEOBJ(me);
 762 }
 763
 764 static PyObject *gchget_name(PyObject *me, void *hunoz)
 765   { return (PyString_FromString(GCHASH_CH(me)->name)); }
 766
 767 static PyObject *gchget_hashsz(PyObject *me, void *hunoz)
 768   { return (PyInt_FromLong(GCHASH_CH(me)->hashsz)); }
 769
 770 static PyObject *gchget_bufsz(PyObject *me, void *hunoz)
 771   { return (PyInt_FromLong(GCHASH_CH(me)->bufsz)); }
 772
 773 static PyObject *ghmeth_copy(PyObject *me, PyObject *arg)
 774 {
 775   if (!PyArg_ParseTuple(arg, ":copy")) return (0);
 776   return (ghash_pywrap((PyObject *)me->ob_type, GH_COPY(GHASH_H(me))));
 777 }
 778
 779 static PyObject *ghmeth_hash(PyObject *me, PyObject *arg)
 780 {
 781   char *p;
 782   Py_ssize_t sz;
 783   if (!PyArg_ParseTuple(arg, "s#:hash", &p, &sz)) return (0);
 784   GH_HASH(GHASH_H(me), p, sz);
 785   RETURN_ME;
 786 }
 787
 788 #define GHMETH_HASHU_(n, W, w)                                          \
 789   static PyObject *ghmeth_hashu##w(PyObject *me, PyObject *arg)         \
 790   {                                                                     \
 791     uint##n x;                                                          \
 792     if (!PyArg_ParseTuple(arg, "O&:hashu" #w, convu##n, &x)) return (0); \
 793     GH_HASHU##W(GHASH_H(me), x);                                        \
 794     RETURN_ME;                                                          \
 795   }
 796 DOUINTCONV(GHMETH_HASHU_)
 797
 798 #define GHMETH_HASHBUF_(n, W, w)                                        \
 799   static PyObject *ghmeth_hashbuf##w(PyObject *me, PyObject *arg)       \
 800   {                                                                     \
 801     char *p;                                                            \
 802     Py_ssize_t sz;                                                      \
 803     if (!PyArg_ParseTuple(arg, "s#:hashbuf" #w, &p, &sz)) goto end;     \
 804     if (sz > MASK##n) TYERR("string too long");                         \
 805     GH_HASHBUF##W(GHASH_H(me), p, sz);                                  \
 806     RETURN_ME;                                                          \
 807   end:                                                                  \
 808     return (0);                                                         \
 809   }
 810 DOUINTCONV(GHMETH_HASHBUF_)
 811
 812 static PyObject *ghmeth_hashstrz(PyObject *me, PyObject *arg)
 813 {
 814   char *p;
 815   if (!PyArg_ParseTuple(arg, "s:hashstrz", &p)) return (0);
 816   GH_HASHSTRZ(GHASH_H(me), p);
 817   RETURN_ME;
 818 }
 819
 820 static PyObject *ghmeth_done(PyObject *me, PyObject *arg)
 821 {
 822   ghash *g;
 823   PyObject *rc;
 824   if (!PyArg_ParseTuple(arg, ":done")) return (0);
 825   g = GH_COPY(GHASH_H(me));
 826   rc = bytestring_pywrap(0, g->ops->c->hashsz);
 827   GH_DONE(g, PyString_AS_STRING(rc));
 828   GH_DESTROY(g);
 829   return (rc);
 830 }
 831
 832 static PyGetSetDef gchash_pygetset[] = {
 833 #define GETSETNAME(op, name) gch##op##_##name
 834   GET   (bufsz,                 "CH.bufsz -> hash buffer size, or zero")
 835   GET   (hashsz,                "CH.hashsz -> hash output size")
 836   GET   (name,                  "CH.name -> name of this kind of hash")
 837 #undef GETSETNAME
 838   { 0 }
 839 };
 840
 841 static PyMethodDef ghash_pymethods[] = {
 842 #define METHNAME(name) ghmeth_##name
 843   METH  (copy,                  "H.copy() -> HH")
 844   METH  (hash,                  "H.hash(M)")
 845 #define METHU_(n, W, w) METH(hashu##w, "H.hashu" #w "(WORD)")
 846   DOUINTCONV(METHU_)
 847 #undef METHU_
 848 #define METHBUF_(n, W, w) METH(hashbuf##w, "H.hashbuf" #w "(BYTES)")
 849   DOUINTCONV(METHBUF_)
 850 #undef METHBUF_
 851   METH  (hashstrz,              "H.hashstrz(STRING)")
 852   METH  (done,                  "H.done() -> HASH")
 853 #undef METHNAME
 854   { 0 }
 855 };
 856
 857 static PyTypeObject gchash_pytype_skel = {
 858   PyObject_HEAD_INIT(0) 0,              /* Header */
 859   "GCHash",                             /* @tp_name@ */
 860   sizeof(gchash_pyobj),                 /* @tp_basicsize@ */
 861   0,                                    /* @tp_itemsize@ */
 862
 863   0,                                    /* @tp_dealloc@ */
 864   0,                                    /* @tp_print@ */
 865   0,                                    /* @tp_getattr@ */
 866   0,                                    /* @tp_setattr@ */
 867   0,                                    /* @tp_compare@ */
 868   0,                                    /* @tp_repr@ */
 869   0,                                    /* @tp_as_number@ */
 870   0,                                    /* @tp_as_sequence@ */
 871   0,                                    /* @tp_as_mapping@ */
 872   0,                                    /* @tp_hash@ */
 873   0,                                    /* @tp_call@ */
 874   0,                                    /* @tp_str@ */
 875   0,                                    /* @tp_getattro@ */
 876   0,                                    /* @tp_setattro@ */
 877   0,                                    /* @tp_as_buffer@ */
 878   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 879     Py_TPFLAGS_BASETYPE,
 880
 881   /* @tp_doc@ */
 882 "Hash function metaclass.",
 883
 884   0,                                    /* @tp_traverse@ */
 885   0,                                    /* @tp_clear@ */
 886   0,                                    /* @tp_richcompare@ */
 887   0,                                    /* @tp_weaklistoffset@ */
 888   0,                                    /* @tp_iter@ */
 889   0,                                    /* @tp_iternext@ */
 890   0,                                    /* @tp_methods@ */
 891   0,                                    /* @tp_members@ */
 892   gchash_pygetset,                      /* @tp_getset@ */
 893   0,                                    /* @tp_base@ */
 894   0,                                    /* @tp_dict@ */
 895   0,                                    /* @tp_descr_get@ */
 896   0,                                    /* @tp_descr_set@ */
 897   0,                                    /* @tp_dictoffset@ */
 898   0,                                    /* @tp_init@ */
 899   PyType_GenericAlloc,                  /* @tp_alloc@ */
 900   abstract_pynew,                       /* @tp_new@ */
 901   0,                                    /* @tp_free@ */
 902   0                                     /* @tp_is_gc@ */
 903 };
 904
 905 static PyTypeObject ghash_pytype_skel = {
 906   PyObject_HEAD_INIT(0) 0,              /* Header */
 907   "GHash",                              /* @tp_name@ */
 908   sizeof(ghash_pyobj),                  /* @tp_basicsize@ */
 909   0,                                    /* @tp_itemsize@ */
 910
 911   ghash_pydealloc,                      /* @tp_dealloc@ */
 912   0,                                    /* @tp_print@ */
 913   0,                                    /* @tp_getattr@ */
 914   0,                                    /* @tp_setattr@ */
 915   0,                                    /* @tp_compare@ */
 916   0,                                    /* @tp_repr@ */
 917   0,                                    /* @tp_as_number@ */
 918   0,                                    /* @tp_as_sequence@ */
 919   0,                                    /* @tp_as_mapping@ */
 920   0,                                    /* @tp_hash@ */
 921   0,                                    /* @tp_call@ */
 922   0,                                    /* @tp_str@ */
 923   0,                                    /* @tp_getattro@ */
 924   0,                                    /* @tp_setattro@ */
 925   0,                                    /* @tp_as_buffer@ */
 926   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 927     Py_TPFLAGS_BASETYPE,
 928
 929   /* @tp_doc@ */
 930 "Hash function, abstract base class.",
 931
 932   0,                                    /* @tp_traverse@ */
 933   0,                                    /* @tp_clear@ */
 934   0,                                    /* @tp_richcompare@ */
 935   0,                                    /* @tp_weaklistoffset@ */
 936   0,                                    /* @tp_iter@ */
 937   0,                                    /* @tp_iternext@ */
 938   ghash_pymethods,                      /* @tp_methods@ */
 939   0,                                    /* @tp_members@ */
 940   0,                                    /* @tp_getset@ */
 941   0,                                    /* @tp_base@ */
 942   0,                                    /* @tp_dict@ */
 943   0,                                    /* @tp_descr_get@ */
 944   0,                                    /* @tp_descr_set@ */
 945   0,                                    /* @tp_dictoffset@ */
 946   0,                                    /* @tp_init@ */
 947   PyType_GenericAlloc,                  /* @tp_alloc@ */
 948   abstract_pynew,                       /* @tp_new@ */
 949   0,                                    /* @tp_free@ */
 950   0                                     /* @tp_is_gc@ */
 951 };
 952
 953 /*----- Message authentication --------------------------------------------*/
 954
 955 PyTypeObject *gcmac_pytype, *gmac_pytype, *gmhash_pytype;
 956
 957 CONVFUNC(gcmac, gcmac *, GCMAC_CM)
 958 CONVFUNC(gmac, gmac *, GMAC_M)
 959 CONVFUNC(gmhash, ghash *, GHASH_H)
 960
 961 static PyObject *gmac_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
 962 {
 963   static const char *const kwlist[] = { "k", 0 };
 964   char *k;
 965   Py_ssize_t sz;
 966
 967   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &k, &sz))
 968     goto end;
 969   if (keysz(sz, GCMAC_CM(ty)->keysz) != sz) VALERR("bad key length");
 970   return (gmac_pywrap((PyObject *)ty,
 971                       GM_KEY(GCMAC_CM(ty), k, sz)));
 972 end:
 973   return (0);
 974 }
 975
 976 static PyObject *gmhash_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
 977 {
 978   static const char *const kwlist[] = { 0 };
 979   ghash_pyobj *g;
 980
 981   if (!PyArg_ParseTupleAndKeywords(arg, kw, ":new", KWLIST)) return (0);
 982   g = PyObject_NEW(ghash_pyobj, ty);
 983   g->h = GM_INIT(GMAC_M(ty));
 984   Py_INCREF(ty);
 985   return ((PyObject *)g);
 986 }
 987
 988 PyObject *gcmac_pywrap(gcmac *cm)
 989 {
 990   gcmac_pyobj *g = newtype(gcmac_pytype, 0, cm->name);
 991   g->cm = cm;
 992   g->ty.ht_type.tp_basicsize = sizeof(gmac_pyobj);
 993   g->ty.ht_type.tp_base = gmac_pytype;
 994   Py_INCREF(gmac_pytype);
 995   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
 996                             Py_TPFLAGS_BASETYPE |
 997                             Py_TPFLAGS_HEAPTYPE);
 998   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
 999   g->ty.ht_type.tp_free = 0;
1000   g->ty.ht_type.tp_new = gmac_pynew;
1001   typeready(&g->ty.ht_type);
1002   return ((PyObject *)g);
1003 }
1004
1005 PyObject *gmac_pywrap(PyObject *cobj, gmac *m)
1006 {
1007   gmac_pyobj *g;
1008   if (!cobj) cobj = gcmac_pywrap((/*unconst*/ gcmac *)GM_CLASS(m));
1009   else Py_INCREF(cobj);
1010   g = newtype((PyTypeObject *)cobj, 0, 0);
1011   g->ty.ht_type.tp_basicsize = sizeof(ghash_pyobj);
1012   g->ty.ht_name = PyString_FromFormat("%s(keyed)", m->ops->c->name);
1013   g->ty.ht_type.tp_name = PyString_AS_STRING(g->ty.ht_name);
1014   g->ty.ht_type.tp_base = gmhash_pytype;
1015   Py_INCREF(gmac_pytype);
1016   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
1017                             Py_TPFLAGS_BASETYPE |
1018                             Py_TPFLAGS_HEAPTYPE);
1019   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
1020   g->ty.ht_type.tp_free = 0;
1021   g->ty.ht_type.tp_new = gmhash_pynew;
1022   typeready(&g->ty.ht_type);
1023   g->m = m;
1024   return ((PyObject *)g);
1025 }
1026
1027 static void gmac_pydealloc(PyObject *me)
1028 {
1029   GM_DESTROY(GMAC_M(me));
1030   Py_DECREF(me->ob_type);
1031   PyType_Type.tp_dealloc(me);
1032 }
1033
1034 static PyObject *gcmget_name(PyObject *me, void *hunoz)
1035   { return (PyString_FromString(GCMAC_CM(me)->name)); }
1036
1037 static PyObject *gcmget_keysz(PyObject *me, void *hunoz)
1038   { return (keysz_pywrap(GCMAC_CM(me)->keysz)); }
1039
1040 static PyObject *gcmget_tagsz(PyObject *me, void *hunoz)
1041   { return (PyInt_FromLong(GCMAC_CM(me)->hashsz)); }
1042
1043 static PyGetSetDef gcmac_pygetset[] = {
1044 #define GETSETNAME(op, name) gcm##op##_##name
1045   GET   (keysz,                 "CM.keysz -> acceptable key sizes")
1046   GET   (tagsz,                 "CM.tagsz -> MAC output size")
1047   GET   (name,                  "CM.name -> name of this kind of MAC")
1048 #undef GETSETNAME
1049   { 0 }
1050 };
1051
1052 static PyTypeObject gcmac_pytype_skel = {
1053   PyObject_HEAD_INIT(0) 0,              /* Header */
1054   "GCMAC",                              /* @tp_name@ */
1055   sizeof(gchash_pyobj),                 /* @tp_basicsize@ */
1056   0,                                    /* @tp_itemsize@ */
1057
1058   0,                                    /* @tp_dealloc@ */
1059   0,                                    /* @tp_print@ */
1060   0,                                    /* @tp_getattr@ */
1061   0,                                    /* @tp_setattr@ */
1062   0,                                    /* @tp_compare@ */
1063   0,                                    /* @tp_repr@ */
1064   0,                                    /* @tp_as_number@ */
1065   0,                                    /* @tp_as_sequence@ */
1066   0,                                    /* @tp_as_mapping@ */
1067   0,                                    /* @tp_hash@ */
1068   0,                                    /* @tp_call@ */
1069   0,                                    /* @tp_str@ */
1070   0,                                    /* @tp_getattro@ */
1071   0,                                    /* @tp_setattro@ */
1072   0,                                    /* @tp_as_buffer@ */
1073   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1074     Py_TPFLAGS_BASETYPE,
1075
1076   /* @tp_doc@ */
1077 "Message authentication code metametaclass.",
1078
1079   0,                                    /* @tp_traverse@ */
1080   0,                                    /* @tp_clear@ */
1081   0,                                    /* @tp_richcompare@ */
1082   0,                                    /* @tp_weaklistoffset@ */
1083   0,                                    /* @tp_iter@ */
1084   0,                                    /* @tp_iternext@ */
1085   0,                                    /* @tp_methods@ */
1086   0,                                    /* @tp_members@ */
1087   gcmac_pygetset,                       /* @tp_getset@ */
1088   0,                                    /* @tp_base@ */
1089   0,                                    /* @tp_dict@ */
1090   0,                                    /* @tp_descr_get@ */
1091   0,                                    /* @tp_descr_set@ */
1092   0,                                    /* @tp_dictoffset@ */
1093   0,                                    /* @tp_init@ */
1094   PyType_GenericAlloc,                  /* @tp_alloc@ */
1095   abstract_pynew,                       /* @tp_new@ */
1096   0,                                    /* @tp_free@ */
1097   0                                     /* @tp_is_gc@ */
1098 };
1099
1100 static PyTypeObject gmac_pytype_skel = {
1101   PyObject_HEAD_INIT(0) 0,              /* Header */
1102   "GMAC",                               /* @tp_name@ */
1103   sizeof(gmac_pyobj),                   /* @tp_basicsize@ */
1104   0,                                    /* @tp_itemsize@ */
1105
1106   gmac_pydealloc,                       /* @tp_dealloc@ */
1107   0,                                    /* @tp_print@ */
1108   0,                                    /* @tp_getattr@ */
1109   0,                                    /* @tp_setattr@ */
1110   0,                                    /* @tp_compare@ */
1111   0,                                    /* @tp_repr@ */
1112   0,                                    /* @tp_as_number@ */
1113   0,                                    /* @tp_as_sequence@ */
1114   0,                                    /* @tp_as_mapping@ */
1115   0,                                    /* @tp_hash@ */
1116   0,                                    /* @tp_call@ */
1117   0,                                    /* @tp_str@ */
1118   0,                                    /* @tp_getattro@ */
1119   0,                                    /* @tp_setattro@ */
1120   0,                                    /* @tp_as_buffer@ */
1121   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1122     Py_TPFLAGS_BASETYPE,
1123
1124   /* @tp_doc@ */
1125 "Message authentication code metaclass, abstract base class.",
1126
1127   0,                                    /* @tp_traverse@ */
1128   0,                                    /* @tp_clear@ */
1129   0,                                    /* @tp_richcompare@ */
1130   0,                                    /* @tp_weaklistoffset@ */
1131   0,                                    /* @tp_iter@ */
1132   0,                                    /* @tp_iternext@ */
1133   0,                                    /* @tp_methods@ */
1134   0,                                    /* @tp_members@ */
1135   0,                                    /* @tp_getset@ */
1136   0,                                    /* @tp_base@ */
1137   0,                                    /* @tp_dict@ */
1138   0,                                    /* @tp_descr_get@ */
1139   0,                                    /* @tp_descr_set@ */
1140   0,                                    /* @tp_dictoffset@ */
1141   0,                                    /* @tp_init@ */
1142   PyType_GenericAlloc,                  /* @tp_alloc@ */
1143   abstract_pynew,                       /* @tp_new@ */
1144   0,                                    /* @tp_free@ */
1145   0                                     /* @tp_is_gc@ */
1146 };
1147
1148 static PyTypeObject gmhash_pytype_skel = {
1149   PyObject_HEAD_INIT(0) 0,              /* Header */
1150   "GMACHash",                           /* @tp_name@ */
1151   sizeof(ghash_pyobj),                  /* @tp_basicsize@ */
1152   0,                                    /* @tp_itemsize@ */
1153
1154   ghash_pydealloc,                      /* @tp_dealloc@ */
1155   0,                                    /* @tp_print@ */
1156   0,                                    /* @tp_getattr@ */
1157   0,                                    /* @tp_setattr@ */
1158   0,                                    /* @tp_compare@ */
1159   0,                                    /* @tp_repr@ */
1160   0,                                    /* @tp_as_number@ */
1161   0,                                    /* @tp_as_sequence@ */
1162   0,                                    /* @tp_as_mapping@ */
1163   0,                                    /* @tp_hash@ */
1164   0,                                    /* @tp_call@ */
1165   0,                                    /* @tp_str@ */
1166   0,                                    /* @tp_getattro@ */
1167   0,                                    /* @tp_setattro@ */
1168   0,                                    /* @tp_as_buffer@ */
1169   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1170     Py_TPFLAGS_BASETYPE,
1171
1172   /* @tp_doc@ */
1173 "Message authentication code, abstract base class.",
1174
1175   0,                                    /* @tp_traverse@ */
1176   0,                                    /* @tp_clear@ */
1177   0,                                    /* @tp_richcompare@ */
1178   0,                                    /* @tp_weaklistoffset@ */
1179   0,                                    /* @tp_iter@ */
1180   0,                                    /* @tp_iternext@ */
1181   0,                                    /* @tp_methods@ */
1182   0,                                    /* @tp_members@ */
1183   0,                                    /* @tp_getset@ */
1184   0,                                    /* @tp_base@ */
1185   0,                                    /* @tp_dict@ */
1186   0,                                    /* @tp_descr_get@ */
1187   0,                                    /* @tp_descr_set@ */
1188   0,                                    /* @tp_dictoffset@ */
1189   0,                                    /* @tp_init@ */
1190   PyType_GenericAlloc,                  /* @tp_alloc@ */
1191   abstract_pynew,                       /* @tp_new@ */
1192   0,                                    /* @tp_free@ */
1193   0                                     /* @tp_is_gc@ */
1194 };
1195
1196 /*----- Special snowflake for Poly1305 ------------------------------------*/
1197
1198 PyTypeObject *poly1305cls_pytype, *poly1305key_pytype, *poly1305hash_pytype;
1199
1200 typedef struct poly1305key_pyobj {
1201   PyHeapTypeObject ty;
1202   poly1305_key k;
1203 } poly1305key_pyobj;
1204
1205 typedef struct poly1305hash_pyobj {
1206   PyObject_HEAD
1207   unsigned f;
1208 #define f_mask 1u
1209   poly1305_ctx ctx;
1210 } poly1305hash_pyobj;
1211
1212 #define P1305_F(o) (((poly1305hash_pyobj *)(o))->f)
1213 #define P1305_CTX(o) (&((poly1305hash_pyobj *)(o))->ctx)
1214 CONVFUNC(poly1305hash, poly1305_ctx *, P1305_CTX)
1215
1216 static PyObject *poly1305hash_pynew(PyTypeObject *ty,
1217                                     PyObject *arg, PyObject *kw)
1218 {
1219   static const char *const kwlist[] = { "mask", 0 };
1220   poly1305key_pyobj *pk = (poly1305key_pyobj *)ty;
1221   poly1305hash_pyobj *ph;
1222   char *m = 0;
1223   Py_ssize_t sz;
1224
1225   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|s#:new", KWLIST, &m, &sz))
1226     return (0);
1227   if (m && sz != POLY1305_MASKSZ) VALERR("bad mask length");
1228   ph = PyObject_NEW(poly1305hash_pyobj, ty);
1229   ph->f = 0;
1230   if (m) ph->f |= f_mask;
1231   poly1305_macinit(&ph->ctx, &pk->k, m);
1232   Py_INCREF(ty);
1233   return ((PyObject *)ph);
1234 end:
1235   return (0);
1236 }
1237
1238 static PyObject *poly1305key_pynew(PyTypeObject *ty,
1239                                    PyObject *arg, PyObject *kw)
1240 {
1241   static const char *const kwlist[] = { "k", 0 };
1242   poly1305key_pyobj *pk;
1243   char *k;
1244   Py_ssize_t sz;
1245
1246   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &k, &sz))
1247     goto end;
1248   if (keysz(sz, poly1305_keysz) != sz) VALERR("bad key length");
1249
1250   pk = newtype(ty, 0, 0);
1251   pk->ty.ht_name = PyString_FromString("poly1305(keyed)");
1252   pk->ty.ht_type.tp_basicsize = sizeof(poly1305hash_pyobj);
1253   pk->ty.ht_type.tp_name = PyString_AS_STRING(pk->ty.ht_name);
1254   pk->ty.ht_type.tp_base = poly1305hash_pytype;
1255   Py_INCREF(poly1305key_pytype);
1256   pk->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
1257                              Py_TPFLAGS_BASETYPE |
1258                              Py_TPFLAGS_HEAPTYPE);
1259   pk->ty.ht_type.tp_alloc = PyType_GenericAlloc;
1260   pk->ty.ht_type.tp_free = 0;
1261   pk->ty.ht_type.tp_new = poly1305hash_pynew;
1262   typeready(&pk->ty.ht_type);
1263
1264   poly1305_keyinit(&pk->k, k, sz);
1265   return ((PyObject *)pk);
1266
1267 end:
1268   return (0);
1269 }
1270
1271 static PyObject *poly1305clsget_name(PyObject *me, void *hunoz)
1272   { return (PyString_FromString("poly1305")); }
1273
1274 static PyObject *poly1305clsget_keysz(PyObject *me, void *hunoz)
1275   { return (keysz_pywrap(poly1305_keysz)); }
1276
1277 static PyObject *poly1305clsget_masksz(PyObject *me, void *hunoz)
1278   { return (PyInt_FromLong(POLY1305_MASKSZ)); }
1279
1280 static PyObject *poly1305clsget_tagsz(PyObject *me, void *hunoz)
1281   { return (PyInt_FromLong(POLY1305_TAGSZ)); }
1282
1283 static PyObject *polymeth_copy(PyObject *me, PyObject *arg)
1284 {
1285   poly1305hash_pyobj *ph;
1286   if (!PyArg_ParseTuple(arg, ":copy")) return (0);
1287   ph = PyObject_NEW(poly1305hash_pyobj, me->ob_type);
1288   poly1305_copy(&ph->ctx, P1305_CTX(me));
1289   Py_INCREF(me->ob_type);
1290   return ((PyObject *)ph);
1291 }
1292
1293 static PyObject *polymeth_hash(PyObject *me, PyObject *arg)
1294 {
1295   char *p;
1296   Py_ssize_t sz;
1297   if (!PyArg_ParseTuple(arg, "s#:hash", &p, &sz)) return (0);
1298   poly1305_hash(P1305_CTX(me), p, sz);
1299   RETURN_ME;
1300 }
1301
1302 #define POLYMETH_HASHU_(n, W, w)                                        \
1303   static PyObject *polymeth_hashu##w(PyObject *me, PyObject *arg)       \
1304   {                                                                     \
1305     uint##n x;                                                          \
1306     octet b[SZ_##W];                                                    \
1307     if (!PyArg_ParseTuple(arg, "O&:hashu" #w, convu##n, &x)) return (0); \
1308     STORE##W(b, x); poly1305_hash(P1305_CTX(me), b, sizeof(b));         \
1309     RETURN_ME;                                                          \
1310   }
1311 DOUINTCONV(POLYMETH_HASHU_)
1312
1313 #define POLYMETH_HASHBUF_(n, W, w)                                      \
1314   static PyObject *polymeth_hashbuf##w(PyObject *me, PyObject *arg)     \
1315   {                                                                     \
1316     char *p;                                                            \
1317     Py_ssize_t sz;                                                      \
1318     octet b[SZ_##W];                                                    \
1319     if (!PyArg_ParseTuple(arg, "s#:hashbuf" #w, &p, &sz)) goto end;     \
1320     if (sz > MASK##n) TYERR("string too long");                         \
1321     STORE##W(b, sz); poly1305_hash(P1305_CTX(me), b, sizeof(b));        \
1322     poly1305_hash(P1305_CTX(me), p, sz);                                \
1323     RETURN_ME;                                                          \
1324   end:                                                                  \
1325     return (0);                                                         \
1326   }
1327 DOUINTCONV(POLYMETH_HASHBUF_)
1328
1329 static PyObject *polymeth_hashstrz(PyObject *me, PyObject *arg)
1330 {
1331   char *p;
1332   if (!PyArg_ParseTuple(arg, "s:hashstrz", &p)) return (0);
1333   poly1305_hash(P1305_CTX(me), p, strlen(p) + 1);
1334   RETURN_ME;
1335 }
1336
1337 static PyObject *polymeth_flush(PyObject *me, PyObject *arg)
1338 {
1339   if (!PyArg_ParseTuple(arg, ":flush")) return (0);
1340   poly1305_flush(P1305_CTX(me));
1341   RETURN_ME;
1342 }
1343
1344 static PyObject *polymeth_flushzero(PyObject *me, PyObject *arg)
1345 {
1346   if (!PyArg_ParseTuple(arg, ":flushzero")) return (0);
1347   poly1305_flushzero(P1305_CTX(me));
1348   RETURN_ME;
1349 }
1350
1351 static PyObject *polymeth_concat(PyObject *me, PyObject *arg)
1352 {
1353   PyObject *pre, *suff;
1354   if (!PyArg_ParseTuple(arg, "OO:concat", &pre, &suff)) return (0);
1355   if (!PyObject_TypeCheck(pre, poly1305hash_pytype) ||
1356       !PyObject_TypeCheck(suff, poly1305hash_pytype))
1357     TYERR("wanted a poly1305hash");
1358   if (me->ob_type != pre->ob_type || me->ob_type != suff->ob_type)
1359     TYERR("key mismatch");
1360   if (P1305_CTX(pre)->nbuf) VALERR("prefix is not block-aligned");
1361   poly1305_concat(P1305_CTX(me), P1305_CTX(pre), P1305_CTX(suff));
1362   RETURN_ME;
1363 end:
1364   return (0);
1365 }
1366
1367 static PyObject *polymeth_done(PyObject *me, PyObject *arg)
1368 {
1369   PyObject *rc;
1370   if (!PyArg_ParseTuple(arg, ":done")) return (0);
1371   if (!(P1305_F(me) & f_mask)) VALERR("no mask");
1372   rc = bytestring_pywrap(0, POLY1305_TAGSZ);
1373   poly1305_done(P1305_CTX(me), PyString_AS_STRING(rc));
1374   return (rc);
1375 end:
1376   return (0);
1377 }
1378
1379 static PyGetSetDef poly1305cls_pygetset[] = {
1380 #define GETSETNAME(op, name) poly1305cls##op##_##name
1381   GET   (keysz,                 "PC.keysz -> acceptable key sizes")
1382   GET   (masksz,                "PC.masksz -> mask size")
1383   GET   (tagsz,                 "PC.tagsz -> MAC output size")
1384   GET   (name,                  "PC.name -> name of this kind of MAC")
1385 #undef GETSETNAME
1386   { 0 }
1387 };
1388
1389 static PyMethodDef poly1305hash_pymethods[] = {
1390 #define METHNAME(name) polymeth_##name
1391   METH  (copy,                  "P.copy() -> PP")
1392   METH  (hash,                  "P.hash(M)")
1393 #define METHU_(n, W, w) METH(hashu##w, "P.hashu" #w "(WORD)")
1394   DOUINTCONV(METHU_)
1395 #undef METHU_
1396 #define METHBUF_(n, W, w) METH(hashbuf##w, "P.hashbuf" #w "(BYTES)")
1397   DOUINTCONV(METHBUF_)
1398 #undef METHBUF_
1399   METH  (hashstrz,              "P.hashstrz(STRING)")
1400   METH  (flush,                 "P.flush()")
1401   METH  (flushzero,             "P.flushzero()")
1402   METH  (concat,                "P.concat(PREFIX, SUFFIX)")
1403   METH  (done,                  "P.done() -> TAG")
1404 #undef METHNAME
1405   { 0 }
1406 };
1407
1408 static PyTypeObject poly1305cls_pytype_skel = {
1409   PyObject_HEAD_INIT(0) 0,              /* Header */
1410   "Poly1305Class",                      /* @tp_name@ */
1411   sizeof(PyHeapTypeObject),             /* @tp_basicsize@ */
1412   0,                                    /* @tp_itemsize@ */
1413
1414   0,                                    /* @tp_dealloc@ */
1415   0,                                    /* @tp_print@ */
1416   0,                                    /* @tp_getattr@ */
1417   0,                                    /* @tp_setattr@ */
1418   0,                                    /* @tp_compare@ */
1419   0,                                    /* @tp_repr@ */
1420   0,                                    /* @tp_as_number@ */
1421   0,                                    /* @tp_as_sequence@ */
1422   0,                                    /* @tp_as_mapping@ */
1423   0,                                    /* @tp_hash@ */
1424   0,                                    /* @tp_call@ */
1425   0,                                    /* @tp_str@ */
1426   0,                                    /* @tp_getattro@ */
1427   0,                                    /* @tp_setattro@ */
1428   0,                                    /* @tp_as_buffer@ */
1429   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1430     Py_TPFLAGS_BASETYPE,
1431
1432   /* @tp_doc@ */
1433 "Poly1305 metametaclass.  Best not to ask.",
1434
1435   0,                                    /* @tp_traverse@ */
1436   0,                                    /* @tp_clear@ */
1437   0,                                    /* @tp_richcompare@ */
1438   0,                                    /* @tp_weaklistoffset@ */
1439   0,                                    /* @tp_iter@ */
1440   0,                                    /* @tp_iternext@ */
1441   0,                                    /* @tp_methods@ */
1442   0,                                    /* @tp_members@ */
1443   poly1305cls_pygetset,                 /* @tp_getset@ */
1444   0,                                    /* @tp_base@ */
1445   0,                                    /* @tp_dict@ */
1446   0,                                    /* @tp_descr_get@ */
1447   0,                                    /* @tp_descr_set@ */
1448   0,                                    /* @tp_dictoffset@ */
1449   0,                                    /* @tp_init@ */
1450   PyType_GenericAlloc,                  /* @tp_alloc@ */
1451   abstract_pynew,                       /* @tp_new@ */
1452   0,                                    /* @tp_free@ */
1453   0                                     /* @tp_is_gc@ */
1454 };
1455
1456 static PyTypeObject poly1305key_pytype_skel = {
1457   PyObject_HEAD_INIT(0) 0,              /* Header */
1458   "poly1305",                           /* @tp_name@ */
1459   sizeof(poly1305key_pyobj),            /* @tp_basicsize@ */
1460   0,                                    /* @tp_itemsize@ */
1461
1462   0,                                    /* @tp_dealloc@ */
1463   0,                                    /* @tp_print@ */
1464   0,                                    /* @tp_getattr@ */
1465   0,                                    /* @tp_setattr@ */
1466   0,                                    /* @tp_compare@ */
1467   0,                                    /* @tp_repr@ */
1468   0,                                    /* @tp_as_number@ */
1469   0,                                    /* @tp_as_sequence@ */
1470   0,                                    /* @tp_as_mapping@ */
1471   0,                                    /* @tp_hash@ */
1472   0,                                    /* @tp_call@ */
1473   0,                                    /* @tp_str@ */
1474   0,                                    /* @tp_getattro@ */
1475   0,                                    /* @tp_setattro@ */
1476   0,                                    /* @tp_as_buffer@ */
1477   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1478     Py_TPFLAGS_BASETYPE,
1479
1480   /* @tp_doc@ */
1481 "poly1305(K): Poly1305 key.",
1482
1483   0,                                    /* @tp_traverse@ */
1484   0,                                    /* @tp_clear@ */
1485   0,                                    /* @tp_richcompare@ */
1486   0,                                    /* @tp_weaklistoffset@ */
1487   0,                                    /* @tp_iter@ */
1488   0,                                    /* @tp_iternext@ */
1489   0,                                    /* @tp_methods@ */
1490   0,                                    /* @tp_members@ */
1491   0,                                    /* @tp_getset@ */
1492   0,                                    /* @tp_base@ */
1493   0,                                    /* @tp_dict@ */
1494   0,                                    /* @tp_descr_get@ */
1495   0,                                    /* @tp_descr_set@ */
1496   0,                                    /* @tp_dictoffset@ */
1497   0,                                    /* @tp_init@ */
1498   PyType_GenericAlloc,                  /* @tp_alloc@ */
1499   poly1305key_pynew,                    /* @tp_new@ */
1500   0,                                    /* @tp_free@ */
1501   0                                     /* @tp_is_gc@ */
1502 };
1503
1504 static PyTypeObject poly1305hash_pytype_skel = {
1505   PyObject_HEAD_INIT(0) 0,              /* Header */
1506   "Poly1305Hash",                       /* @tp_name@ */
1507   sizeof(poly1305hash_pyobj),           /* @tp_basicsize@ */
1508   0,                                    /* @tp_itemsize@ */
1509
1510   0,                                    /* @tp_dealloc@ */
1511   0,                                    /* @tp_print@ */
1512   0,                                    /* @tp_getattr@ */
1513   0,                                    /* @tp_setattr@ */
1514   0,                                    /* @tp_compare@ */
1515   0,                                    /* @tp_repr@ */
1516   0,                                    /* @tp_as_number@ */
1517   0,                                    /* @tp_as_sequence@ */
1518   0,                                    /* @tp_as_mapping@ */
1519   0,                                    /* @tp_hash@ */
1520   0,                                    /* @tp_call@ */
1521   0,                                    /* @tp_str@ */
1522   0,                                    /* @tp_getattro@ */
1523   0,                                    /* @tp_setattro@ */
1524   0,                                    /* @tp_as_buffer@ */
1525   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1526     Py_TPFLAGS_BASETYPE,
1527
1528   /* @tp_doc@ */
1529 "Poly1305 MAC context base class.",
1530
1531   0,                                    /* @tp_traverse@ */
1532   0,                                    /* @tp_clear@ */
1533   0,                                    /* @tp_richcompare@ */
1534   0,                                    /* @tp_weaklistoffset@ */
1535   0,                                    /* @tp_iter@ */
1536   0,                                    /* @tp_iternext@ */
1537   poly1305hash_pymethods,               /* @tp_methods@ */
1538   0,                                    /* @tp_members@ */
1539   0,                                    /* @tp_getset@ */
1540   0,                                    /* @tp_base@ */
1541   0,                                    /* @tp_dict@ */
1542   0,                                    /* @tp_descr_get@ */
1543   0,                                    /* @tp_descr_set@ */
1544   0,                                    /* @tp_dictoffset@ */
1545   0,                                    /* @tp_init@ */
1546   PyType_GenericAlloc,                  /* @tp_alloc@ */
1547   abstract_pynew,                       /* @tp_new@ */
1548   0,                                    /* @tp_free@ */
1549   0                                     /* @tp_is_gc@ */
1550 };
1551
1552 /*----- Special snowflake for HSalsa and HChaCha --------------------------*/
1553
1554 #define DEF_HDANCE(DANCE, HDANCE, dance, hdance)                        \
1555   static PyObject *meth_##hdance##_prf(PyObject *me, PyObject *arg)     \
1556   {                                                                     \
1557     dance##_ctx dance;                                                  \
1558     char *k, *n;                                                        \
1559     Py_ssize_t ksz, nsz;                                                \
1560     PyObject *rc;                                                       \
1561     if (!PyArg_ParseTuple(arg, "s#s#:" #hdance "_prf",                  \
1562                           &k, &ksz, &n, &nsz))                          \
1563       goto end;                                                         \
1564     if (ksz != DANCE##_KEYSZ) VALERR("bad key length");                 \
1565     if (nsz != HDANCE##_INSZ) VALERR("bad input length");               \
1566     rc = bytestring_pywrap(0, HSALSA20_OUTSZ);                          \
1567     dance##_init(&dance, k, ksz, 0);                                    \
1568     hdance##_prf(&dance, n, PyString_AS_STRING(rc));                    \
1569     return (rc);                                                        \
1570   end:                                                                  \
1571     return (0);                                                         \
1572   }
1573
1574 DEF_HDANCE(SALSA20, HSALSA20, salsa20, hsalsa20)
1575 DEF_HDANCE(SALSA20, HSALSA20, salsa20, hsalsa2012)
1576 DEF_HDANCE(SALSA20, HSALSA20, salsa20, hsalsa208)
1577
1578 DEF_HDANCE(CHACHA, HCHACHA, chacha, hchacha20)
1579 DEF_HDANCE(CHACHA, HCHACHA, chacha, hchacha12)
1580 DEF_HDANCE(CHACHA, HCHACHA, chacha, hchacha8)
1581
1582 /*----- Keccak-p[1600, n] -------------------------------------------------*/
1583
1584 static PyTypeObject *kxvik_pytype;
1585
1586 typedef struct kxvik_pyobj {
1587   PyObject_HEAD
1588   keccak1600_state s;
1589   unsigned n;
1590 } kxvik_pyobj;
1591
1592 static PyObject *kxvik_pynew(PyTypeObject *ty,
1593                                   PyObject *arg, PyObject *kw)
1594 {
1595   unsigned n = 24;
1596   kxvik_pyobj *rc = 0;
1597   static const char *const kwlist[] = { "nround", 0 };
1598   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:new", KWLIST,
1599                                    convuint, &n))
1600     goto end;
1601   rc = (kxvik_pyobj *)ty->tp_alloc(ty, 0);
1602   rc->n = n;
1603   keccak1600_init(&rc->s);
1604 end:
1605   return ((PyObject *)rc);
1606 }
1607
1608 static PyObject *kxvikmeth_copy(PyObject *me, PyObject *arg)
1609 {
1610   kxvik_pyobj *k = (kxvik_pyobj *)me, *rc = 0;
1611   if (!PyArg_ParseTuple(arg, ":copy")) goto end;
1612   rc = (kxvik_pyobj *)k->ob_type->tp_alloc(k->ob_type, 0);
1613   rc->s = k->s; rc->n = k->n;
1614 end:
1615   return ((PyObject *)rc);
1616 }
1617
1618 static PyObject *kxvikmeth_mix(PyObject *me, PyObject *arg)
1619 {
1620   kxvik_pyobj *k = (kxvik_pyobj *)me;
1621   kludge64 t[25];
1622   const octet *q;
1623   octet buf[8];
1624   unsigned i;
1625   char *p; Py_ssize_t n;
1626
1627   if (!PyArg_ParseTuple(arg, "s#:mix", &p, &n)) goto end;
1628   if (n > 200) VALERR("out of range");
1629   q = (const octet *)p;
1630   i = 0;
1631   while (n > 8) { LOAD64_L_(t[i], q); i++; q += 8; n -= 8; }
1632   if (n) {
1633     memcpy(buf, q, n); memset(buf + n, 0, 8 - n);
1634     LOAD64_L_(t[i], buf); i++;
1635   }
1636   keccak1600_mix(&k->s, t, i);
1637   RETURN_ME;
1638 end:
1639   return (0);
1640 }
1641
1642 static PyObject *kxvikmeth_extract(PyObject *me, PyObject *arg)
1643 {
1644   kxvik_pyobj *k = (kxvik_pyobj *)me;
1645   PyObject *rc = 0;
1646   kludge64 t[25];
1647   octet *q, buf[8];
1648   unsigned i;
1649   unsigned n;
1650
1651   if (!PyArg_ParseTuple(arg, "O&:mix", convuint, &n)) goto end;
1652   if (n > 200) VALERR("out of range");
1653   rc = bytestring_pywrap(0, n);
1654   q = (octet *)PyString_AS_STRING(rc);
1655   keccak1600_extract(&k->s, t, (n + 7)/8);
1656   i = 0;
1657   while (n > 8) { STORE64_L_(q, t[i]); i++; q += 8; n -= 8; }
1658   if (n) { STORE64_L_(buf, t[i]); memcpy(q, buf, n); }
1659 end:
1660   return (rc);
1661 }
1662
1663 static PyObject *kxvikmeth_step(PyObject *me, PyObject *arg)
1664 {
1665   kxvik_pyobj *k = (kxvik_pyobj *)me;
1666   if (!PyArg_ParseTuple(arg, ":step")) return (0);
1667   keccak1600_p(&k->s, &k->s, k->n);
1668   RETURN_ME;
1669 }
1670
1671 static PyObject *kxvikget_nround(PyObject *me, void *hunoz)
1672 {
1673   kxvik_pyobj *k = (kxvik_pyobj *)me;
1674   return (PyInt_FromLong(k->n));
1675 }
1676
1677 static int kxvikset_nround(PyObject *me, PyObject *val, void *hunoz)
1678 {
1679   kxvik_pyobj *k = (kxvik_pyobj *)me;
1680   unsigned n;
1681
1682   if (!convuint(val, &n)) return (-1);
1683   k->n = n;
1684   return (0);
1685 }
1686
1687 static PyGetSetDef kxvik_pygetset[] = {
1688 #define GETSETNAME(op, name) kxvik##op##_##name
1689   GETSET(nround,                "KECCAK.nround -> number of rounds")
1690 #undef GETSETNAME
1691   { 0 }
1692 };
1693
1694 static PyMethodDef kxvik_pymethods[] = {
1695 #define METHNAME(func) kxvikmeth_##func
1696   METH  (copy,                  "KECCAK.copy() -> KECCAK'")
1697   METH  (mix,                   "KECCAK.mix(DATA)")
1698   METH  (extract,               "KECCAK.extract(NOCTETS)")
1699   METH  (step,                  "KECCAK.step()")
1700 #undef METHNAME
1701   { 0 }
1702 };
1703
1704 static PyTypeObject kxvik_pytype_skel = {
1705   PyObject_HEAD_INIT(0) 0,              /* Header */
1706   "Keccak1600",                         /* @tp_name@ */
1707   sizeof(kxvik_pyobj),                  /* @tp_basicsize@ */
1708   0,                                    /* @tp_itemsize@ */
1709
1710   0,                                    /* @tp_dealloc@ */
1711   0,                                    /* @tp_print@ */
1712   0,                                    /* @tp_getattr@ */
1713   0,                                    /* @tp_setattr@ */
1714   0,                                    /* @tp_compare@ */
1715   0,                                    /* @tp_repr@ */
1716   0,                                    /* @tp_as_number@ */
1717   0,                                    /* @tp_as_sequence@ */
1718   0,                                    /* @tp_as_mapping@ */
1719   0,                                    /* @tp_hash@ */
1720   0,                                    /* @tp_call@ */
1721   0,                                    /* @tp_str@ */
1722   0,                                    /* @tp_getattro@ */
1723   0,                                    /* @tp_setattro@ */
1724   0,                                    /* @tp_as_buffer@ */
1725   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1726     Py_TPFLAGS_BASETYPE,
1727
1728   /* @tp_doc@ */
1729 "Keccak1600([nround = 24]): Keccak-p[1600, n] state.",
1730
1731   0,                                    /* @tp_traverse@ */
1732   0,                                    /* @tp_clear@ */
1733   0,                                    /* @tp_richcompare@ */
1734   0,                                    /* @tp_weaklistoffset@ */
1735   0,                                    /* @tp_iter@ */
1736   0,                                    /* @tp_iternext@ */
1737   kxvik_pymethods,                      /* @tp_methods@ */
1738   0,                                    /* @tp_members@ */
1739   kxvik_pygetset,                       /* @tp_getset@ */
1740   0,                                    /* @tp_base@ */
1741   0,                                    /* @tp_dict@ */
1742   0,                                    /* @tp_descr_get@ */
1743   0,                                    /* @tp_descr_set@ */
1744   0,                                    /* @tp_dictoffset@ */
1745   0,                                    /* @tp_init@ */
1746   PyType_GenericAlloc,                  /* @tp_alloc@ */
1747   kxvik_pynew,                          /* @tp_new@ */
1748   0,                                    /* @tp_free@ */
1749   0                                     /* @tp_is_gc@ */
1750 };
1751
1752 static PyTypeObject *shake_pytype, *shake128_pytype, *shake256_pytype;
1753
1754 typedef struct shake_pyobj {
1755   PyObject_HEAD
1756   int st;
1757   shake_ctx h;
1758 } shake_pyobj;
1759
1760 #define SHAKE_H(o) (&((shake_pyobj *)(o))->h)
1761 #define SHAKE_ST(o) (((shake_pyobj *)(o))->st)
1762
1763 static PyObject *shake_dopynew(void (*initfn)(shake_ctx *,
1764                                               const void *, size_t,
1765                                               const void *, size_t),
1766                                PyTypeObject *ty,
1767                                PyObject *arg, PyObject *kw)
1768 {
1769   shake_pyobj *rc = 0;
1770   char *p = 0, *f = 0;
1771   Py_ssize_t psz = 0, fsz = 0;
1772   static const char *const kwlist[] = { "perso", "func", 0 };
1773
1774   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|s#s#:new", KWLIST,
1775                                    &p, &psz, &f, &fsz))
1776     goto end;
1777   rc = (shake_pyobj *)ty->tp_alloc(ty, 0);
1778   initfn(&rc->h, f, fsz, p, psz);
1779   rc->st = 0;
1780 end:
1781   return ((PyObject *)rc);
1782 }
1783
1784 static PyObject *shake128_pynew(PyTypeObject *ty,
1785                                 PyObject *arg, PyObject *kw)
1786   { return (shake_dopynew(cshake128_init, ty, arg, kw)); }
1787
1788 static PyObject *shake256_pynew(PyTypeObject *ty,
1789                                 PyObject *arg, PyObject *kw)
1790   { return (shake_dopynew(cshake256_init, ty, arg, kw)); }
1791
1792 static int shake_check(PyObject *me, int st)
1793 {
1794   if (SHAKE_ST(me) != st) VALERR("wrong state");
1795   return (0);
1796 end:
1797   return (-1);
1798 }
1799
1800 static PyObject *shakemeth_hash(PyObject *me, PyObject *arg)
1801 {
1802   char *p;
1803   Py_ssize_t sz;
1804   if (!PyArg_ParseTuple(arg, "s#:hash", &p, &sz)) return (0);
1805   if (shake_check(me, 0)) return (0);
1806   shake_hash(SHAKE_H(me), p, sz);
1807   RETURN_ME;
1808 }
1809
1810 #define SHAKEMETH_HASHU_(n, W, w)                                       \
1811   static PyObject *shakemeth_hashu##w(PyObject *me, PyObject *arg)      \
1812   {                                                                     \
1813     uint##n x;                                                          \
1814     octet b[SZ_##W];                                                    \
1815     if (!PyArg_ParseTuple(arg, "O&:hashu" #w, convu##n, &x)) return (0); \
1816     if (shake_check(me, 0)) return (0);                                 \
1817     STORE##W(b, x); shake_hash(SHAKE_H(me), b, sizeof(b));              \
1818     RETURN_ME;                                                          \
1819   }
1820 DOUINTCONV(SHAKEMETH_HASHU_)
1821
1822 #define SHAKEMETH_HASHBUF_(n, W, w)                                     \
1823   static PyObject *shakemeth_hashbuf##w(PyObject *me, PyObject *arg)    \
1824   {                                                                     \
1825     char *p;                                                            \
1826     Py_ssize_t sz;                                                      \
1827     octet b[SZ_##W];                                                    \
1828     if (!PyArg_ParseTuple(arg, "s#:hashbuf" #w, &p, &sz)) goto end;     \
1829     if (sz > MASK##n) TYERR("string too long");                         \
1830     if (shake_check(me, 0)) goto end;                                   \
1831     STORE##W(b, sz); shake_hash(SHAKE_H(me), b, sizeof(b));             \
1832     shake_hash(SHAKE_H(me), p, sz);                                     \
1833     RETURN_ME;                                                          \
1834   end:                                                                  \
1835     return (0);                                                         \
1836   }
1837 DOUINTCONV(SHAKEMETH_HASHBUF_)
1838
1839 static PyObject *shakemeth_hashstrz(PyObject *me, PyObject *arg)
1840 {
1841   char *p;
1842   if (!PyArg_ParseTuple(arg, "s:hashstrz", &p)) return (0);
1843   if (shake_check(me, 0)) return (0);
1844   shake_hash(SHAKE_H(me), p, strlen(p) + 1);
1845   RETURN_ME;
1846 }
1847
1848 static PyObject *shakemeth_xof(PyObject *me, PyObject *arg)
1849 {
1850   if (!PyArg_ParseTuple(arg, ":xof")) goto end;
1851   if (shake_check(me, 0)) goto end;
1852   shake_xof(SHAKE_H(me));
1853   SHAKE_ST(me) = 1;
1854   RETURN_ME;
1855 end:
1856   return (0);
1857 }
1858
1859 static PyObject *shakemeth_done(PyObject *me, PyObject *arg)
1860 {
1861   PyObject *rc = 0;
1862   size_t n;
1863   if (!PyArg_ParseTuple(arg, "O&:done", convszt, &n)) goto end;
1864   if (shake_check(me, 0)) goto end;
1865   rc = bytestring_pywrap(0, n);
1866   shake_done(SHAKE_H(me), PyString_AS_STRING(rc), n);
1867   SHAKE_ST(me) = -1;
1868 end:
1869   return (rc);
1870 }
1871
1872 static PyObject *shakemeth_copy(PyObject *me, PyObject *arg)
1873 {
1874   shake_pyobj *rc = 0;
1875
1876   if (!PyArg_ParseTuple(arg, ":copy")) goto end;
1877   rc = PyObject_NEW(shake_pyobj, me->ob_type);
1878   rc->h = *SHAKE_H(me);
1879   rc->st = SHAKE_ST(me);
1880 end:
1881   return ((PyObject *)me);
1882 }
1883
1884 static PyObject *shakemeth_get(PyObject *me, PyObject *arg)
1885 {
1886   PyObject *rc = 0;
1887   size_t sz;
1888
1889   if (!PyArg_ParseTuple(arg, "O&:get", convszt, &sz)) goto end;
1890   if (shake_check(me, 1)) goto end;
1891   rc = bytestring_pywrap(0, sz);
1892   shake_get(SHAKE_H(me), PyString_AS_STRING(rc), sz);
1893 end:
1894   return (rc);
1895 }
1896
1897 static PyObject *shakemeth_mask(PyObject *me, PyObject *arg)
1898 {
1899   PyObject *rc = 0;
1900   char *p; Py_ssize_t sz;
1901
1902   if (!PyArg_ParseTuple(arg, "s#:mask", &p, &sz)) goto end;
1903   if (shake_check(me, 1)) goto end;
1904   rc = bytestring_pywrap(0, sz);
1905   shake_mask(SHAKE_H(me), p, PyString_AS_STRING(rc), sz);
1906 end:
1907   return (rc);
1908 }
1909
1910 static PyObject *shakeget_rate(PyObject *me, void *hunoz)
1911   { return (PyInt_FromLong(SHAKE_H(me)->h.r)); }
1912
1913 static PyObject *shakeget_buffered(PyObject *me, void *hunoz)
1914   { return (PyInt_FromLong(SHAKE_H(me)->h.n)); }
1915
1916 static PyObject *shakeget_state(PyObject *me, void *hunoz)
1917 {
1918   int st = SHAKE_ST(me);
1919   return (PyString_FromString(st == 0 ? "absorb" :
1920                               st == 1 ? "squeeze" : "dead"));
1921 }
1922
1923 static PyGetSetDef shake_pygetset[] = {
1924 #define GETSETNAME(op, name) shake##op##_##name
1925   GET   (rate,                  "S.rate -> rate, in bytes")
1926   GET   (buffered,              "S.buffered -> amount currently buffered")
1927   GET   (state,                 "S.state -> `absorb', `squeeze', `dead'")
1928 #undef GETSETNAME
1929   { 0 }
1930 };
1931
1932 static PyMethodDef shake_pymethods[] = {
1933 #define METHNAME(func) shakemeth_##func
1934   METH  (copy,                  "S.copy() -> SS")
1935   METH  (hash,                  "S.hash(M)")
1936 #define METHU_(n, W, w) METH(hashu##w, "S.hashu" #w "(WORD)")
1937   DOUINTCONV(METHU_)
1938 #undef METHU_
1939 #define METHBUF_(n, W, w) METH(hashbuf##w, "S.hashbuf" #w "(BYTES)")
1940   DOUINTCONV(METHBUF_)
1941 #undef METHBUF_
1942   METH  (hashstrz,              "S.hashstrz(STRING)")
1943   METH  (xof,                   "S.xof()")
1944   METH  (done,                  "S.done(LEN) ->H")
1945   METH  (get,                   "S.get(LEN) -> H")
1946   METH  (mask,                  "S.mask(M) -> C")
1947 #undef METHNAME
1948   { 0 }
1949 };
1950
1951 static PyTypeObject shake_pytype_skel = {
1952   PyObject_HEAD_INIT(0) 0,              /* Header */
1953   "Shake",                              /* @tp_name@ */
1954   sizeof(shake_pyobj),                  /* @tp_basicsize@ */
1955   0,                                    /* @tp_itemsize@ */
1956
1957   0,                                    /* @tp_dealloc@ */
1958   0,                                    /* @tp_print@ */
1959   0,                                    /* @tp_getattr@ */
1960   0,                                    /* @tp_setattr@ */
1961   0,                                    /* @tp_compare@ */
1962   0,                                    /* @tp_repr@ */
1963   0,                                    /* @tp_as_number@ */
1964   0,                                    /* @tp_as_sequence@ */
1965   0,                                    /* @tp_as_mapping@ */
1966   0,                                    /* @tp_hash@ */
1967   0,                                    /* @tp_call@ */
1968   0,                                    /* @tp_str@ */
1969   0,                                    /* @tp_getattro@ */
1970   0,                                    /* @tp_setattro@ */
1971   0,                                    /* @tp_as_buffer@ */
1972   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1973     Py_TPFLAGS_BASETYPE,
1974
1975   /* @tp_doc@ */
1976 "SHAKE/cSHAKE base class.",
1977
1978   0,                                    /* @tp_traverse@ */
1979   0,                                    /* @tp_clear@ */
1980   0,                                    /* @tp_richcompare@ */
1981   0,                                    /* @tp_weaklistoffset@ */
1982   0,                                    /* @tp_iter@ */
1983   0,                                    /* @tp_iternext@ */
1984   shake_pymethods,                      /* @tp_methods@ */
1985   0,                                    /* @tp_members@ */
1986   shake_pygetset,                       /* @tp_getset@ */
1987   0,                                    /* @tp_base@ */
1988   0,                                    /* @tp_dict@ */
1989   0,                                    /* @tp_descr_get@ */
1990   0,                                    /* @tp_descr_set@ */
1991   0,                                    /* @tp_dictoffset@ */
1992   0,                                    /* @tp_init@ */
1993   PyType_GenericAlloc,                  /* @tp_alloc@ */
1994   abstract_pynew,                       /* @tp_new@ */
1995   0,                                    /* @tp_free@ */
1996   0                                     /* @tp_is_gc@ */
1997 };
1998
1999 static PyTypeObject shake128_pytype_skel = {
2000   PyObject_HEAD_INIT(0) 0,              /* Header */
2001   "Shake128",                           /* @tp_name@ */
2002   0,                                    /* @tp_basicsize@ */
2003   0,                                    /* @tp_itemsize@ */
2004
2005   0,                                    /* @tp_dealloc@ */
2006   0,                                    /* @tp_print@ */
2007   0,                                    /* @tp_getattr@ */
2008   0,                                    /* @tp_setattr@ */
2009   0,                                    /* @tp_compare@ */
2010   0,                                    /* @tp_repr@ */
2011   0,                                    /* @tp_as_number@ */
2012   0,                                    /* @tp_as_sequence@ */
2013   0,                                    /* @tp_as_mapping@ */
2014   0,                                    /* @tp_hash@ */
2015   0,                                    /* @tp_call@ */
2016   0,                                    /* @tp_str@ */
2017   0,                                    /* @tp_getattro@ */
2018   0,                                    /* @tp_setattro@ */
2019   0,                                    /* @tp_as_buffer@ */
2020   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2021     Py_TPFLAGS_BASETYPE,
2022
2023   /* @tp_doc@ */
2024 "Shake128([perso = STR], [func = STR]): SHAKE128/cSHAKE128 XOF.",
2025
2026   0,                                    /* @tp_traverse@ */
2027   0,                                    /* @tp_clear@ */
2028   0,                                    /* @tp_richcompare@ */
2029   0,                                    /* @tp_weaklistoffset@ */
2030   0,                                    /* @tp_iter@ */
2031   0,                                    /* @tp_iternext@ */
2032   0,                                    /* @tp_methods@ */
2033   0,                                    /* @tp_members@ */
2034   0,                                    /* @tp_getset@ */
2035   0,                                    /* @tp_base@ */
2036   0,                                    /* @tp_dict@ */
2037   0,                                    /* @tp_descr_get@ */
2038   0,                                    /* @tp_descr_set@ */
2039   0,                                    /* @tp_dictoffset@ */
2040   0,                                    /* @tp_init@ */
2041   PyType_GenericAlloc,                  /* @tp_alloc@ */
2042   shake128_pynew,                       /* @tp_new@ */
2043   0,                                    /* @tp_free@ */
2044   0                                     /* @tp_is_gc@ */
2045 };
2046
2047 static PyTypeObject shake256_pytype_skel = {
2048   PyObject_HEAD_INIT(0) 0,              /* Header */
2049   "Shake256",                           /* @tp_name@ */
2050   0,                                    /* @tp_basicsize@ */
2051   0,                                    /* @tp_itemsize@ */
2052
2053   0,                                    /* @tp_dealloc@ */
2054   0,                                    /* @tp_print@ */
2055   0,                                    /* @tp_getattr@ */
2056   0,                                    /* @tp_setattr@ */
2057   0,                                    /* @tp_compare@ */
2058   0,                                    /* @tp_repr@ */
2059   0,                                    /* @tp_as_number@ */
2060   0,                                    /* @tp_as_sequence@ */
2061   0,                                    /* @tp_as_mapping@ */
2062   0,                                    /* @tp_hash@ */
2063   0,                                    /* @tp_call@ */
2064   0,                                    /* @tp_str@ */
2065   0,                                    /* @tp_getattro@ */
2066   0,                                    /* @tp_setattro@ */
2067   0,                                    /* @tp_as_buffer@ */
2068   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2069     Py_TPFLAGS_BASETYPE,
2070
2071   /* @tp_doc@ */
2072 "Shake256([perso = STR], [func = STR]): SHAKE256/cSHAKE256 XOF.",
2073
2074   0,                                    /* @tp_traverse@ */
2075   0,                                    /* @tp_clear@ */
2076   0,                                    /* @tp_richcompare@ */
2077   0,                                    /* @tp_weaklistoffset@ */
2078   0,                                    /* @tp_iter@ */
2079   0,                                    /* @tp_iternext@ */
2080   0,                                    /* @tp_methods@ */
2081   0,                                    /* @tp_members@ */
2082   0,                                    /* @tp_getset@ */
2083   0,                                    /* @tp_base@ */
2084   0,                                    /* @tp_dict@ */
2085   0,                                    /* @tp_descr_get@ */
2086   0,                                    /* @tp_descr_set@ */
2087   0,                                    /* @tp_dictoffset@ */
2088   0,                                    /* @tp_init@ */
2089   PyType_GenericAlloc,                  /* @tp_alloc@ */
2090   shake256_pynew,                       /* @tp_new@ */
2091   0,                                    /* @tp_free@ */
2092   0                                     /* @tp_is_gc@ */
2093 };
2094
2095 /*----- Pseudorandom permutations -----------------------------------------*/
2096
2097 static PyTypeObject *gcprp_pytype, *gprp_pytype;
2098
2099 typedef struct prpinfo {
2100   const char *name;
2101   const octet *keysz;
2102   size_t ctxsz;
2103   size_t blksz;
2104   void (*init)(void *, const void *, size_t);
2105   void (*eblk)(void *, const void *, void *);
2106   void (*dblk)(void *, const void *, void *);
2107 } prpinfo;
2108
2109 #define PRP_DEF(PRE, pre)                                               \
2110   static void pre##_prpinit(void *ctx, const void *k, size_t ksz)       \
2111     { pre##_init(ctx, k, ksz); }                                        \
2112   static void pre##_prpeblk(void *ctx, const void *in, void *out)       \
2113   {                                                                     \
2114     uint32 w[PRE##_BLKSZ/4]; BLKC_LOAD(PRE, w, in);                     \
2115     pre##_eblk(ctx, w, w); BLKC_STORE(PRE, out, w);                     \
2116   }                                                                     \
2117   static void pre##_prpdblk(void *ctx, const void *in, void *out)       \
2118   {                                                                     \
2119     uint32 w[PRE##_BLKSZ/4]; BLKC_LOAD(PRE, w, in);                     \
2120     pre##_dblk(ctx, w, w); BLKC_STORE(PRE, out, w);                     \
2121   }                                                                     \
2122   static const prpinfo pre##_prpinfo = {                                \
2123     #pre, pre##_keysz, sizeof(pre##_ctx), PRE##_BLKSZ,                  \
2124     pre##_prpinit, pre##_prpeblk, pre##_prpdblk                         \
2125   };
2126 PRPS(PRP_DEF)
2127
2128 static const struct prpinfo *const gprptab[] = {
2129 #define PRP_ENTRY(PRE, pre) &pre##_prpinfo,
2130   PRPS(PRP_ENTRY)
2131   0
2132 };
2133
2134 typedef struct gcprp_pyobj {
2135   PyHeapTypeObject ty;
2136   const prpinfo *prp;
2137 } gcprp_pyobj;
2138 #define GCPRP_PRP(o) (((gcprp_pyobj *)(o))->prp)
2139
2140 typedef struct gprp_pyobj {
2141   PyObject_HEAD
2142   const prpinfo *prp;
2143 } gprp_pyobj;
2144 #define GPRP_PRP(o) (((gprp_pyobj *)(o))->prp)
2145 #define GPRP_CTX(o) (((gprp_pyobj *)(o)) + 1)
2146
2147 typedef struct prp {
2148   const prpinfo *prp;
2149   void *ctx;
2150 } prp;
2151
2152 static PyObject *gprp_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
2153 {
2154   static const char *const kwlist[] = { "key", 0 };
2155   char *k;
2156   Py_ssize_t sz;
2157   const prpinfo *prp = GCPRP_PRP(ty);
2158   PyObject *me;
2159
2160   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &k, &sz))
2161     goto end;
2162   if (keysz(sz, prp->keysz) != sz) VALERR("bad key length");
2163   me = (PyObject *)ty->tp_alloc(ty, 0);
2164   GPRP_PRP(me) = prp;
2165   prp->init(GPRP_CTX(me), k, sz);
2166   Py_INCREF(me);
2167   return (me);
2168 end:
2169   return (0);
2170 }
2171
2172 static void gprp_pydealloc(PyObject *me)
2173   { Py_DECREF(me->ob_type); FREEOBJ(me); }
2174
2175 static PyObject *gcprp_pywrap(const prpinfo *prp)
2176 {
2177   gcprp_pyobj *g = newtype(gcprp_pytype, 0, prp->name);
2178   g->prp = prp;
2179   g->ty.ht_type.tp_basicsize = sizeof(gprp_pyobj) + prp->ctxsz;
2180   g->ty.ht_type.tp_base = gprp_pytype;
2181   Py_INCREF(gprp_pytype);
2182   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
2183                             Py_TPFLAGS_BASETYPE |
2184                             Py_TPFLAGS_HEAPTYPE);
2185   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
2186   g->ty.ht_type.tp_free = 0;
2187   g->ty.ht_type.tp_new = gprp_pynew;
2188   typeready(&g->ty.ht_type);
2189   return ((PyObject *)g);
2190 }
2191
2192 static PyObject *gcpget_name(PyObject *me, void *hunoz)
2193   { return (PyString_FromString(GCPRP_PRP(me)->name)); }
2194 static PyObject *gcpget_keysz(PyObject *me, void *hunoz)
2195   { return (keysz_pywrap(GCPRP_PRP(me)->keysz)); }
2196 static PyObject *gcpget_blksz(PyObject *me, void *hunoz)
2197   { return (PyInt_FromLong(GCPRP_PRP(me)->blksz)); }
2198
2199 static PyObject *gpmeth_encrypt(PyObject *me, PyObject *arg)
2200 {
2201   char *p;
2202   Py_ssize_t n;
2203   PyObject *rc = 0;
2204
2205   if (!PyArg_ParseTuple(arg, "s#:encrypt", &p, &n)) goto end;
2206   if (n != GPRP_PRP(me)->blksz) VALERR("incorrect block length");
2207   rc = bytestring_pywrap(0, n);
2208   GPRP_PRP(me)->eblk(GPRP_CTX(me), p, PyString_AS_STRING(rc));
2209 end:
2210   return (rc);
2211 }
2212
2213 static PyObject *gpmeth_decrypt(PyObject *me, PyObject *arg)
2214 {
2215   char *p;
2216   Py_ssize_t n;
2217   PyObject *rc = 0;
2218
2219   if (!PyArg_ParseTuple(arg, "s#:decrypt", &p, &n)) goto end;
2220   if (n != GPRP_PRP(me)->blksz) VALERR("incorrect block length");
2221   rc = bytestring_pywrap(0, n);
2222   GPRP_PRP(me)->dblk(GPRP_CTX(me), p, PyString_AS_STRING(rc));
2223 end:
2224   return (rc);
2225 }
2226
2227 static PyGetSetDef gcprp_pygetset[] = {
2228 #define GETSETNAME(op, name) gcp##op##_##name
2229   GET   (keysz,                 "CP.keysz -> acceptable key sizes")
2230   GET   (blksz,                 "CP.blksz -> block size")
2231   GET   (name,                  "CP.name -> name of this kind of PRP")
2232 #undef GETSETNAME
2233   { 0 }
2234 };
2235
2236 static PyMethodDef gprp_pymethods[] = {
2237 #define METHNAME(name) gpmeth_##name
2238   METH  (encrypt,               "P.encrypt(PT) -> CT")
2239   METH  (decrypt,               "P.decrypt(CT) -> PT")
2240 #undef METHNAME
2241   { 0 }
2242 };
2243
2244 static PyTypeObject gcprp_pytype_skel = {
2245   PyObject_HEAD_INIT(0) 0,              /* Header */
2246   "GCPRP",                              /* @tp_name@ */
2247   sizeof(gcprp_pyobj),                  /* @tp_basicsize@ */
2248   0,                                    /* @tp_itemsize@ */
2249
2250   0,                                    /* @tp_dealloc@ */
2251   0,                                    /* @tp_print@ */
2252   0,                                    /* @tp_getattr@ */
2253   0,                                    /* @tp_setattr@ */
2254   0,                                    /* @tp_compare@ */
2255   0,                                    /* @tp_repr@ */
2256   0,                                    /* @tp_as_number@ */
2257   0,                                    /* @tp_as_sequence@ */
2258   0,                                    /* @tp_as_mapping@ */
2259   0,                                    /* @tp_hash@ */
2260   0,                                    /* @tp_call@ */
2261   0,                                    /* @tp_str@ */
2262   0,                                    /* @tp_getattro@ */
2263   0,                                    /* @tp_setattro@ */
2264   0,                                    /* @tp_as_buffer@ */
2265   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2266     Py_TPFLAGS_BASETYPE,
2267
2268   /* @tp_doc@ */
2269 "Pseudorandom permutation metaclass.",
2270
2271   0,                                    /* @tp_traverse@ */
2272   0,                                    /* @tp_clear@ */
2273   0,                                    /* @tp_richcompare@ */
2274   0,                                    /* @tp_weaklistoffset@ */
2275   0,                                    /* @tp_iter@ */
2276   0,                                    /* @tp_iternext@ */
2277   0,                                    /* @tp_methods@ */
2278   0,                                    /* @tp_members@ */
2279   gcprp_pygetset,                       /* @tp_getset@ */
2280   0,                                    /* @tp_base@ */
2281   0,                                    /* @tp_dict@ */
2282   0,                                    /* @tp_descr_get@ */
2283   0,                                    /* @tp_descr_set@ */
2284   0,                                    /* @tp_dictoffset@ */
2285   0,                                    /* @tp_init@ */
2286   PyType_GenericAlloc,                  /* @tp_alloc@ */
2287   abstract_pynew,                       /* @tp_new@ */
2288   0,                                    /* @tp_free@ */
2289   0                                     /* @tp_is_gc@ */
2290 };
2291
2292 static PyTypeObject gprp_pytype_skel = {
2293   PyObject_HEAD_INIT(0) 0,              /* Header */
2294   "GPRP",                               /* @tp_name@ */
2295   sizeof(gprp_pyobj),                   /* @tp_basicsize@ */
2296   0,                                    /* @tp_itemsize@ */
2297
2298   gprp_pydealloc,                       /* @tp_dealloc@ */
2299   0,                                    /* @tp_print@ */
2300   0,                                    /* @tp_getattr@ */
2301   0,                                    /* @tp_setattr@ */
2302   0,                                    /* @tp_compare@ */
2303   0,                                    /* @tp_repr@ */
2304   0,                                    /* @tp_as_number@ */
2305   0,                                    /* @tp_as_sequence@ */
2306   0,                                    /* @tp_as_mapping@ */
2307   0,                                    /* @tp_hash@ */
2308   0,                                    /* @tp_call@ */
2309   0,                                    /* @tp_str@ */
2310   0,                                    /* @tp_getattro@ */
2311   0,                                    /* @tp_setattro@ */
2312   0,                                    /* @tp_as_buffer@ */
2313   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2314     Py_TPFLAGS_BASETYPE,
2315
2316   /* @tp_doc@ */
2317 "Pseudorandom permutation, abstract base class.",
2318
2319   0,                                    /* @tp_traverse@ */
2320   0,                                    /* @tp_clear@ */
2321   0,                                    /* @tp_richcompare@ */
2322   0,                                    /* @tp_weaklistoffset@ */
2323   0,                                    /* @tp_iter@ */
2324   0,                                    /* @tp_iternext@ */
2325   gprp_pymethods,                       /* @tp_methods@ */
2326   0,                                    /* @tp_members@ */
2327   0,                                    /* @tp_getset@ */
2328   0,                                    /* @tp_base@ */
2329   0,                                    /* @tp_dict@ */
2330   0,                                    /* @tp_descr_get@ */
2331   0,                                    /* @tp_descr_set@ */
2332   0,                                    /* @tp_dictoffset@ */
2333   0,                                    /* @tp_init@ */
2334   PyType_GenericAlloc,                  /* @tp_alloc@ */
2335   abstract_pynew,                       /* @tp_new@ */
2336   0,                                    /* @tp_free@ */
2337   0                                     /* @tp_is_gc@ */
2338 };
2339
2340 /*----- Main code ---------------------------------------------------------*/
2341
2342 static PyMethodDef methods[] = {
2343 #define METHNAME(func) meth_##func
2344   METH  (_KeySZ_fromdl,         "\
2345 fromdl(N) -> M: convert integer discrete log field size to work factor")
2346   METH  (_KeySZ_fromschnorr,    "\
2347 fromschnorr(N) -> M: convert Schnorr group order to work factor")
2348   METH  (_KeySZ_fromif,         "\
2349 fromif(N) -> M: convert integer factorization problem size to work factor")
2350   METH  (_KeySZ_fromec,         "\
2351 fromec(N) -> M: convert elliptic curve group order to work factor")
2352   METH  (_KeySZ_todl,           "\
2353 todl(N) -> M: convert work factor to integer discrete log field size")
2354   METH  (_KeySZ_toschnorr,      "\
2355 toschnorr(N) -> M: convert work factor to Schnorr group order")
2356   METH  (_KeySZ_toif,           "\
2357 toif(N) -> M: convert work factor to integer factorization problem size")
2358   METH  (_KeySZ_toec,           "\
2359 toec(N) -> M: convert work factor to elliptic curve group order")
2360   METH  (_KeySZ_toec,           "\
2361 toec(N) -> M: convert work factor to elliptic curve group order")
2362 #define METH_HDANCE(hdance, HDance) METH(hdance##_prf, "\
2363 " #hdance "_prf(K, N) -> H: calculate " HDance " hash of N with K")
2364   METH_HDANCE(hsalsa20, "HSalsa20")
2365   METH_HDANCE(hsalsa2012, "HSalsa20/12")
2366   METH_HDANCE(hsalsa208, "HSalsa20/8")
2367   METH_HDANCE(hchacha20, "HChaCha20")
2368   METH_HDANCE(hchacha12, "HChaCha12")
2369   METH_HDANCE(hchacha8, "HChaCha8")
2370 #undef METH_DANCE
2371 #undef METHNAME
2372   { 0 }
2373 };
2374
2375 void algorithms_pyinit(void)
2376 {
2377   INITTYPE(keysz, root);
2378   INITTYPE(keyszany, keysz);
2379   INITTYPE(keyszrange, keysz);
2380   INITTYPE(keyszset, keysz);
2381   INITTYPE(gccipher, type);
2382   INITTYPE(gcipher, root);
2383   INITTYPE(gchash, type);
2384   INITTYPE(ghash, root);
2385   INITTYPE(gcmac, type);
2386   INITTYPE(gmac, type);
2387   INITTYPE(gmhash, ghash);
2388   INITTYPE(poly1305cls, type);
2389   INITTYPE_META(poly1305key, type, poly1305cls);
2390   INITTYPE(poly1305hash, root);
2391   INITTYPE(kxvik, root);
2392   INITTYPE(shake, root);
2393   INITTYPE(shake128, shake);
2394   INITTYPE(shake256, shake);
2395   INITTYPE(gcprp, type);
2396   INITTYPE(gprp, root);
2397   addmethods(methods);
2398 }
2399
2400 GEN(gcciphers, cipher)
2401 GEN(gchashes, hash)
2402 GEN(gcmacs, mac)
2403 #define gcprp prpinfo
2404 GEN(gcprps, prp)
2405
2406 void algorithms_pyinsert(PyObject *mod)
2407 {
2408   PyObject *d;
2409   INSERT("KeySZ", keysz_pytype);
2410   INSERT("KeySZAny", keyszany_pytype);
2411   INSERT("KeySZRange", keyszrange_pytype);
2412   INSERT("KeySZSet", keyszset_pytype);
2413   INSERT("GCCipher", gccipher_pytype);
2414   INSERT("GCipher", gcipher_pytype);
2415   INSERT("gcciphers", gcciphers());
2416   INSERT("GCHash", gchash_pytype);
2417   INSERT("GHash", ghash_pytype);
2418   INSERT("gchashes", d = gchashes());
2419   sha_pyobj = PyDict_GetItemString(d, "sha"); Py_INCREF(sha_pyobj);
2420   has160_pyobj = PyDict_GetItemString(d, "has160"); Py_INCREF(has160_pyobj);
2421   INSERT("GCMAC", gcmac_pytype);
2422   INSERT("GMAC", gmac_pytype);
2423   INSERT("GMACHash", gmhash_pytype);
2424   INSERT("gcmacs", gcmacs());
2425   INSERT("Poly1305Class", poly1305cls_pytype);
2426   INSERT("poly1305", poly1305key_pytype);
2427   INSERT("Poly1305Hash", poly1305hash_pytype);
2428   INSERT("Keccak1600", kxvik_pytype);
2429   INSERT("Shake", shake_pytype);
2430   INSERT("Shake128", shake128_pytype);
2431   INSERT("Shake256", shake256_pytype);
2432   INSERT("GCPRP", gcprp_pytype);
2433   INSERT("GPRP", gprp_pytype);
2434   INSERT("gcprps", gcprps());
2435 }
2436
2437 /*----- That's all, folks -------------------------------------------------*/