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_hash(PyObject *me, PyObject *arg)
 774 {
 775   char *p;
 776   Py_ssize_t sz;
 777   if (!PyArg_ParseTuple(arg, "s#:hash", &p, &sz)) return (0);
 778   GH_HASH(GHASH_H(me), p, sz);
 779   RETURN_ME;
 780 }
 781
 782 #define GHMETH_HASHU_(n, W, w)                                          \
 783   static PyObject *ghmeth_hashu##w(PyObject *me, PyObject *arg)         \
 784   {                                                                     \
 785     uint##n x;                                                          \
 786     if (!PyArg_ParseTuple(arg, "O&:hashu" #w, convu##n, &x)) return (0); \
 787     GH_HASHU##W(GHASH_H(me), x);                                        \
 788     RETURN_ME;                                                          \
 789   }
 790 DOUINTCONV(GHMETH_HASHU_)
 791
 792 #define GHMETH_HASHBUF_(n, W, w)                                        \
 793   static PyObject *ghmeth_hashbuf##w(PyObject *me, PyObject *arg)       \
 794   {                                                                     \
 795     char *p;                                                            \
 796     Py_ssize_t sz;                                                      \
 797     if (!PyArg_ParseTuple(arg, "s#:hashbuf" #w, &p, &sz)) goto end;     \
 798     if (sz > MASK##n) TYERR("string too long");                         \
 799     GH_HASHBUF##W(GHASH_H(me), p, sz);                                  \
 800     RETURN_ME;                                                          \
 801   end:                                                                  \
 802     return (0);                                                         \
 803   }
 804 DOUINTCONV(GHMETH_HASHBUF_)
 805
 806 static PyObject *ghmeth_hashstrz(PyObject *me, PyObject *arg)
 807 {
 808   char *p;
 809   if (!PyArg_ParseTuple(arg, "s:hashstrz", &p)) return (0);
 810   GH_HASHSTRZ(GHASH_H(me), p);
 811   RETURN_ME;
 812 }
 813
 814 static PyObject *ghmeth_done(PyObject *me, PyObject *arg)
 815 {
 816   ghash *g;
 817   PyObject *rc;
 818   if (!PyArg_ParseTuple(arg, ":done")) return (0);
 819   g = GH_COPY(GHASH_H(me));
 820   rc = bytestring_pywrap(0, g->ops->c->hashsz);
 821   GH_DONE(g, PyString_AS_STRING(rc));
 822   GH_DESTROY(g);
 823   return (rc);
 824 }
 825
 826 static PyGetSetDef gchash_pygetset[] = {
 827 #define GETSETNAME(op, name) gch##op##_##name
 828   GET   (bufsz,                 "CH.bufsz -> hash buffer size, or zero")
 829   GET   (hashsz,                "CH.hashsz -> hash output size")
 830   GET   (name,                  "CH.name -> name of this kind of hash")
 831 #undef GETSETNAME
 832   { 0 }
 833 };
 834
 835 static PyMethodDef ghash_pymethods[] = {
 836 #define METHNAME(name) ghmeth_##name
 837   METH  (hash,                  "H.hash(M)")
 838 #define METHU_(n, W, w) METH(hashu##w, "H.hashu" #w "(WORD)")
 839   DOUINTCONV(METHU_)
 840 #undef METHU_
 841 #define METHBUF_(n, W, w) METH(hashbuf##w, "H.hashbuf" #w "(BYTES)")
 842   DOUINTCONV(METHBUF_)
 843 #undef METHBUF_
 844   METH  (hashstrz,              "H.hashstrz(STRING)")
 845   METH  (done,                  "H.done() -> HASH")
 846 #undef METHNAME
 847   { 0 }
 848 };
 849
 850 static PyTypeObject gchash_pytype_skel = {
 851   PyObject_HEAD_INIT(0) 0,              /* Header */
 852   "GCHash",                             /* @tp_name@ */
 853   sizeof(gchash_pyobj),                 /* @tp_basicsize@ */
 854   0,                                    /* @tp_itemsize@ */
 855
 856   0,                                    /* @tp_dealloc@ */
 857   0,                                    /* @tp_print@ */
 858   0,                                    /* @tp_getattr@ */
 859   0,                                    /* @tp_setattr@ */
 860   0,                                    /* @tp_compare@ */
 861   0,                                    /* @tp_repr@ */
 862   0,                                    /* @tp_as_number@ */
 863   0,                                    /* @tp_as_sequence@ */
 864   0,                                    /* @tp_as_mapping@ */
 865   0,                                    /* @tp_hash@ */
 866   0,                                    /* @tp_call@ */
 867   0,                                    /* @tp_str@ */
 868   0,                                    /* @tp_getattro@ */
 869   0,                                    /* @tp_setattro@ */
 870   0,                                    /* @tp_as_buffer@ */
 871   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 872     Py_TPFLAGS_BASETYPE,
 873
 874   /* @tp_doc@ */
 875 "Hash function metaclass.",
 876
 877   0,                                    /* @tp_traverse@ */
 878   0,                                    /* @tp_clear@ */
 879   0,                                    /* @tp_richcompare@ */
 880   0,                                    /* @tp_weaklistoffset@ */
 881   0,                                    /* @tp_iter@ */
 882   0,                                    /* @tp_iternext@ */
 883   0,                                    /* @tp_methods@ */
 884   0,                                    /* @tp_members@ */
 885   gchash_pygetset,                      /* @tp_getset@ */
 886   0,                                    /* @tp_base@ */
 887   0,                                    /* @tp_dict@ */
 888   0,                                    /* @tp_descr_get@ */
 889   0,                                    /* @tp_descr_set@ */
 890   0,                                    /* @tp_dictoffset@ */
 891   0,                                    /* @tp_init@ */
 892   PyType_GenericAlloc,                  /* @tp_alloc@ */
 893   abstract_pynew,                       /* @tp_new@ */
 894   0,                                    /* @tp_free@ */
 895   0                                     /* @tp_is_gc@ */
 896 };
 897
 898 static PyTypeObject ghash_pytype_skel = {
 899   PyObject_HEAD_INIT(0) 0,              /* Header */
 900   "GHash",                              /* @tp_name@ */
 901   sizeof(ghash_pyobj),                  /* @tp_basicsize@ */
 902   0,                                    /* @tp_itemsize@ */
 903
 904   ghash_pydealloc,                      /* @tp_dealloc@ */
 905   0,                                    /* @tp_print@ */
 906   0,                                    /* @tp_getattr@ */
 907   0,                                    /* @tp_setattr@ */
 908   0,                                    /* @tp_compare@ */
 909   0,                                    /* @tp_repr@ */
 910   0,                                    /* @tp_as_number@ */
 911   0,                                    /* @tp_as_sequence@ */
 912   0,                                    /* @tp_as_mapping@ */
 913   0,                                    /* @tp_hash@ */
 914   0,                                    /* @tp_call@ */
 915   0,                                    /* @tp_str@ */
 916   0,                                    /* @tp_getattro@ */
 917   0,                                    /* @tp_setattro@ */
 918   0,                                    /* @tp_as_buffer@ */
 919   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 920     Py_TPFLAGS_BASETYPE,
 921
 922   /* @tp_doc@ */
 923 "Hash function, abstract base class.",
 924
 925   0,                                    /* @tp_traverse@ */
 926   0,                                    /* @tp_clear@ */
 927   0,                                    /* @tp_richcompare@ */
 928   0,                                    /* @tp_weaklistoffset@ */
 929   0,                                    /* @tp_iter@ */
 930   0,                                    /* @tp_iternext@ */
 931   ghash_pymethods,                      /* @tp_methods@ */
 932   0,                                    /* @tp_members@ */
 933   0,                                    /* @tp_getset@ */
 934   0,                                    /* @tp_base@ */
 935   0,                                    /* @tp_dict@ */
 936   0,                                    /* @tp_descr_get@ */
 937   0,                                    /* @tp_descr_set@ */
 938   0,                                    /* @tp_dictoffset@ */
 939   0,                                    /* @tp_init@ */
 940   PyType_GenericAlloc,                  /* @tp_alloc@ */
 941   abstract_pynew,                       /* @tp_new@ */
 942   0,                                    /* @tp_free@ */
 943   0                                     /* @tp_is_gc@ */
 944 };
 945
 946 /*----- Message authentication --------------------------------------------*/
 947
 948 PyTypeObject *gcmac_pytype, *gmac_pytype, *gmhash_pytype;
 949
 950 CONVFUNC(gcmac, gcmac *, GCMAC_CM)
 951 CONVFUNC(gmac, gmac *, GMAC_M)
 952 CONVFUNC(gmhash, ghash *, GHASH_H)
 953
 954 static PyObject *gmac_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
 955 {
 956   static const char *const kwlist[] = { "k", 0 };
 957   char *k;
 958   Py_ssize_t sz;
 959
 960   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &k, &sz))
 961     goto end;
 962   if (keysz(sz, GCMAC_CM(ty)->keysz) != sz) VALERR("bad key length");
 963   return (gmac_pywrap((PyObject *)ty,
 964                       GM_KEY(GCMAC_CM(ty), k, sz)));
 965 end:
 966   return (0);
 967 }
 968
 969 static PyObject *gmhash_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
 970 {
 971   static const char *const kwlist[] = { 0 };
 972   ghash_pyobj *g;
 973
 974   if (!PyArg_ParseTupleAndKeywords(arg, kw, ":new", KWLIST)) return (0);
 975   g = PyObject_NEW(ghash_pyobj, ty);
 976   g->h = GM_INIT(GMAC_M(ty));
 977   Py_INCREF(ty);
 978   return ((PyObject *)g);
 979 }
 980
 981 PyObject *gcmac_pywrap(gcmac *cm)
 982 {
 983   gcmac_pyobj *g = newtype(gcmac_pytype, 0, cm->name);
 984   g->cm = cm;
 985   g->ty.ht_type.tp_basicsize = sizeof(gmac_pyobj);
 986   g->ty.ht_type.tp_base = gmac_pytype;
 987   Py_INCREF(gmac_pytype);
 988   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
 989                             Py_TPFLAGS_BASETYPE |
 990                             Py_TPFLAGS_HEAPTYPE);
 991   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
 992   g->ty.ht_type.tp_free = 0;
 993   g->ty.ht_type.tp_new = gmac_pynew;
 994   typeready(&g->ty.ht_type);
 995   return ((PyObject *)g);
 996 }
 997
 998 PyObject *gmac_pywrap(PyObject *cobj, gmac *m)
 999 {
1000   gmac_pyobj *g;
1001   if (!cobj) cobj = gcmac_pywrap((/*unconst*/ gcmac *)GM_CLASS(m));
1002   else Py_INCREF(cobj);
1003   g = newtype((PyTypeObject *)cobj, 0, 0);
1004   g->ty.ht_type.tp_basicsize = sizeof(ghash_pyobj);
1005   g->ty.ht_name = PyString_FromFormat("%s(keyed)", m->ops->c->name);
1006   g->ty.ht_type.tp_name = PyString_AS_STRING(g->ty.ht_name);
1007   g->ty.ht_type.tp_base = gmhash_pytype;
1008   Py_INCREF(gmac_pytype);
1009   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
1010                             Py_TPFLAGS_BASETYPE |
1011                             Py_TPFLAGS_HEAPTYPE);
1012   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
1013   g->ty.ht_type.tp_free = 0;
1014   g->ty.ht_type.tp_new = gmhash_pynew;
1015   typeready(&g->ty.ht_type);
1016   g->m = m;
1017   return ((PyObject *)g);
1018 }
1019
1020 static void gmac_pydealloc(PyObject *me)
1021 {
1022   GM_DESTROY(GMAC_M(me));
1023   Py_DECREF(me->ob_type);
1024   PyType_Type.tp_dealloc(me);
1025 }
1026
1027 static PyObject *gcmget_name(PyObject *me, void *hunoz)
1028   { return (PyString_FromString(GCMAC_CM(me)->name)); }
1029
1030 static PyObject *gcmget_keysz(PyObject *me, void *hunoz)
1031   { return (keysz_pywrap(GCMAC_CM(me)->keysz)); }
1032
1033 static PyObject *gcmget_tagsz(PyObject *me, void *hunoz)
1034   { return (PyInt_FromLong(GCMAC_CM(me)->hashsz)); }
1035
1036 static PyGetSetDef gcmac_pygetset[] = {
1037 #define GETSETNAME(op, name) gcm##op##_##name
1038   GET   (keysz,                 "CM.keysz -> acceptable key sizes")
1039   GET   (tagsz,                 "CM.tagsz -> MAC output size")
1040   GET   (name,                  "CM.name -> name of this kind of MAC")
1041 #undef GETSETNAME
1042   { 0 }
1043 };
1044
1045 static PyTypeObject gcmac_pytype_skel = {
1046   PyObject_HEAD_INIT(0) 0,              /* Header */
1047   "GCMAC",                              /* @tp_name@ */
1048   sizeof(gchash_pyobj),                 /* @tp_basicsize@ */
1049   0,                                    /* @tp_itemsize@ */
1050
1051   0,                                    /* @tp_dealloc@ */
1052   0,                                    /* @tp_print@ */
1053   0,                                    /* @tp_getattr@ */
1054   0,                                    /* @tp_setattr@ */
1055   0,                                    /* @tp_compare@ */
1056   0,                                    /* @tp_repr@ */
1057   0,                                    /* @tp_as_number@ */
1058   0,                                    /* @tp_as_sequence@ */
1059   0,                                    /* @tp_as_mapping@ */
1060   0,                                    /* @tp_hash@ */
1061   0,                                    /* @tp_call@ */
1062   0,                                    /* @tp_str@ */
1063   0,                                    /* @tp_getattro@ */
1064   0,                                    /* @tp_setattro@ */
1065   0,                                    /* @tp_as_buffer@ */
1066   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1067     Py_TPFLAGS_BASETYPE,
1068
1069   /* @tp_doc@ */
1070 "Message authentication code metametaclass.",
1071
1072   0,                                    /* @tp_traverse@ */
1073   0,                                    /* @tp_clear@ */
1074   0,                                    /* @tp_richcompare@ */
1075   0,                                    /* @tp_weaklistoffset@ */
1076   0,                                    /* @tp_iter@ */
1077   0,                                    /* @tp_iternext@ */
1078   0,                                    /* @tp_methods@ */
1079   0,                                    /* @tp_members@ */
1080   gcmac_pygetset,                       /* @tp_getset@ */
1081   0,                                    /* @tp_base@ */
1082   0,                                    /* @tp_dict@ */
1083   0,                                    /* @tp_descr_get@ */
1084   0,                                    /* @tp_descr_set@ */
1085   0,                                    /* @tp_dictoffset@ */
1086   0,                                    /* @tp_init@ */
1087   PyType_GenericAlloc,                  /* @tp_alloc@ */
1088   abstract_pynew,                       /* @tp_new@ */
1089   0,                                    /* @tp_free@ */
1090   0                                     /* @tp_is_gc@ */
1091 };
1092
1093 static PyTypeObject gmac_pytype_skel = {
1094   PyObject_HEAD_INIT(0) 0,              /* Header */
1095   "GMAC",                               /* @tp_name@ */
1096   sizeof(gmac_pyobj),                   /* @tp_basicsize@ */
1097   0,                                    /* @tp_itemsize@ */
1098
1099   gmac_pydealloc,                       /* @tp_dealloc@ */
1100   0,                                    /* @tp_print@ */
1101   0,                                    /* @tp_getattr@ */
1102   0,                                    /* @tp_setattr@ */
1103   0,                                    /* @tp_compare@ */
1104   0,                                    /* @tp_repr@ */
1105   0,                                    /* @tp_as_number@ */
1106   0,                                    /* @tp_as_sequence@ */
1107   0,                                    /* @tp_as_mapping@ */
1108   0,                                    /* @tp_hash@ */
1109   0,                                    /* @tp_call@ */
1110   0,                                    /* @tp_str@ */
1111   0,                                    /* @tp_getattro@ */
1112   0,                                    /* @tp_setattro@ */
1113   0,                                    /* @tp_as_buffer@ */
1114   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1115     Py_TPFLAGS_BASETYPE,
1116
1117   /* @tp_doc@ */
1118 "Message authentication code metaclass, abstract base class.",
1119
1120   0,                                    /* @tp_traverse@ */
1121   0,                                    /* @tp_clear@ */
1122   0,                                    /* @tp_richcompare@ */
1123   0,                                    /* @tp_weaklistoffset@ */
1124   0,                                    /* @tp_iter@ */
1125   0,                                    /* @tp_iternext@ */
1126   0,                                    /* @tp_methods@ */
1127   0,                                    /* @tp_members@ */
1128   0,                                    /* @tp_getset@ */
1129   0,                                    /* @tp_base@ */
1130   0,                                    /* @tp_dict@ */
1131   0,                                    /* @tp_descr_get@ */
1132   0,                                    /* @tp_descr_set@ */
1133   0,                                    /* @tp_dictoffset@ */
1134   0,                                    /* @tp_init@ */
1135   PyType_GenericAlloc,                  /* @tp_alloc@ */
1136   abstract_pynew,                       /* @tp_new@ */
1137   0,                                    /* @tp_free@ */
1138   0                                     /* @tp_is_gc@ */
1139 };
1140
1141 static PyTypeObject gmhash_pytype_skel = {
1142   PyObject_HEAD_INIT(0) 0,              /* Header */
1143   "GMACHash",                           /* @tp_name@ */
1144   sizeof(ghash_pyobj),                  /* @tp_basicsize@ */
1145   0,                                    /* @tp_itemsize@ */
1146
1147   ghash_pydealloc,                      /* @tp_dealloc@ */
1148   0,                                    /* @tp_print@ */
1149   0,                                    /* @tp_getattr@ */
1150   0,                                    /* @tp_setattr@ */
1151   0,                                    /* @tp_compare@ */
1152   0,                                    /* @tp_repr@ */
1153   0,                                    /* @tp_as_number@ */
1154   0,                                    /* @tp_as_sequence@ */
1155   0,                                    /* @tp_as_mapping@ */
1156   0,                                    /* @tp_hash@ */
1157   0,                                    /* @tp_call@ */
1158   0,                                    /* @tp_str@ */
1159   0,                                    /* @tp_getattro@ */
1160   0,                                    /* @tp_setattro@ */
1161   0,                                    /* @tp_as_buffer@ */
1162   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1163     Py_TPFLAGS_BASETYPE,
1164
1165   /* @tp_doc@ */
1166 "Message authentication code, abstract base class.",
1167
1168   0,                                    /* @tp_traverse@ */
1169   0,                                    /* @tp_clear@ */
1170   0,                                    /* @tp_richcompare@ */
1171   0,                                    /* @tp_weaklistoffset@ */
1172   0,                                    /* @tp_iter@ */
1173   0,                                    /* @tp_iternext@ */
1174   0,                                    /* @tp_methods@ */
1175   0,                                    /* @tp_members@ */
1176   0,                                    /* @tp_getset@ */
1177   0,                                    /* @tp_base@ */
1178   0,                                    /* @tp_dict@ */
1179   0,                                    /* @tp_descr_get@ */
1180   0,                                    /* @tp_descr_set@ */
1181   0,                                    /* @tp_dictoffset@ */
1182   0,                                    /* @tp_init@ */
1183   PyType_GenericAlloc,                  /* @tp_alloc@ */
1184   abstract_pynew,                       /* @tp_new@ */
1185   0,                                    /* @tp_free@ */
1186   0                                     /* @tp_is_gc@ */
1187 };
1188
1189 /*----- Special snowflake for Poly1305 ------------------------------------*/
1190
1191 PyTypeObject *poly1305cls_pytype, *poly1305key_pytype, *poly1305hash_pytype;
1192
1193 typedef struct poly1305key_pyobj {
1194   PyHeapTypeObject ty;
1195   poly1305_key k;
1196 } poly1305key_pyobj;
1197
1198 typedef struct poly1305hash_pyobj {
1199   PyObject_HEAD
1200   unsigned f;
1201 #define f_mask 1u
1202   poly1305_ctx ctx;
1203 } poly1305hash_pyobj;
1204
1205 #define P1305_F(o) (((poly1305hash_pyobj *)(o))->f)
1206 #define P1305_CTX(o) (&((poly1305hash_pyobj *)(o))->ctx)
1207 CONVFUNC(poly1305hash, poly1305_ctx *, P1305_CTX)
1208
1209 static PyObject *poly1305hash_pynew(PyTypeObject *ty,
1210                                     PyObject *arg, PyObject *kw)
1211 {
1212   static const char *const kwlist[] = { "mask", 0 };
1213   poly1305key_pyobj *pk = (poly1305key_pyobj *)ty;
1214   poly1305hash_pyobj *ph;
1215   char *m = 0;
1216   Py_ssize_t sz;
1217
1218   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|s#:new", KWLIST, &m, &sz))
1219     return (0);
1220   if (m && sz != POLY1305_MASKSZ) VALERR("bad mask length");
1221   ph = PyObject_NEW(poly1305hash_pyobj, ty);
1222   ph->f = 0;
1223   if (m) ph->f |= f_mask;
1224   poly1305_macinit(&ph->ctx, &pk->k, m);
1225   Py_INCREF(ty);
1226   return ((PyObject *)ph);
1227 end:
1228   return (0);
1229 }
1230
1231 static PyObject *poly1305key_pynew(PyTypeObject *ty,
1232                                    PyObject *arg, PyObject *kw)
1233 {
1234   static const char *const kwlist[] = { "k", 0 };
1235   poly1305key_pyobj *pk;
1236   char *k;
1237   Py_ssize_t sz;
1238
1239   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &k, &sz))
1240     goto end;
1241   if (keysz(sz, poly1305_keysz) != sz) VALERR("bad key length");
1242
1243   pk = newtype(ty, 0, 0);
1244   pk->ty.ht_name = PyString_FromString("poly1305(keyed)");
1245   pk->ty.ht_type.tp_basicsize = sizeof(poly1305hash_pyobj);
1246   pk->ty.ht_type.tp_name = PyString_AS_STRING(pk->ty.ht_name);
1247   pk->ty.ht_type.tp_base = poly1305hash_pytype;
1248   Py_INCREF(poly1305key_pytype);
1249   pk->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
1250                              Py_TPFLAGS_BASETYPE |
1251                              Py_TPFLAGS_HEAPTYPE);
1252   pk->ty.ht_type.tp_alloc = PyType_GenericAlloc;
1253   pk->ty.ht_type.tp_free = 0;
1254   pk->ty.ht_type.tp_new = poly1305hash_pynew;
1255   typeready(&pk->ty.ht_type);
1256
1257   poly1305_keyinit(&pk->k, k, sz);
1258   return ((PyObject *)pk);
1259
1260 end:
1261   return (0);
1262 }
1263
1264 static PyObject *poly1305clsget_name(PyObject *me, void *hunoz)
1265   { return (PyString_FromString("poly1305")); }
1266
1267 static PyObject *poly1305clsget_keysz(PyObject *me, void *hunoz)
1268   { return (keysz_pywrap(poly1305_keysz)); }
1269
1270 static PyObject *poly1305clsget_masksz(PyObject *me, void *hunoz)
1271   { return (PyInt_FromLong(POLY1305_MASKSZ)); }
1272
1273 static PyObject *poly1305clsget_tagsz(PyObject *me, void *hunoz)
1274   { return (PyInt_FromLong(POLY1305_TAGSZ)); }
1275
1276 static PyObject *polymeth_copy(PyObject *me, PyObject *arg)
1277 {
1278   poly1305hash_pyobj *ph;
1279   if (!PyArg_ParseTuple(arg, ":copy")) return (0);
1280   ph = PyObject_NEW(poly1305hash_pyobj, me->ob_type);
1281   poly1305_copy(&ph->ctx, P1305_CTX(me));
1282   Py_INCREF(me->ob_type);
1283   return ((PyObject *)ph);
1284 }
1285
1286 static PyObject *polymeth_hash(PyObject *me, PyObject *arg)
1287 {
1288   char *p;
1289   Py_ssize_t sz;
1290   if (!PyArg_ParseTuple(arg, "s#:hash", &p, &sz)) return (0);
1291   poly1305_hash(P1305_CTX(me), p, sz);
1292   RETURN_ME;
1293 }
1294
1295 #define POLYMETH_HASHU_(n, W, w)                                        \
1296   static PyObject *polymeth_hashu##w(PyObject *me, PyObject *arg)       \
1297   {                                                                     \
1298     uint##n x;                                                          \
1299     octet b[SZ_##W];                                                    \
1300     if (!PyArg_ParseTuple(arg, "O&:hashu" #w, convu##n, &x)) return (0); \
1301     STORE##W(b, x); poly1305_hash(P1305_CTX(me), b, sizeof(b));         \
1302     RETURN_ME;                                                          \
1303   }
1304 DOUINTCONV(POLYMETH_HASHU_)
1305
1306 #define POLYMETH_HASHBUF_(n, W, w)                                      \
1307   static PyObject *polymeth_hashbuf##w(PyObject *me, PyObject *arg)     \
1308   {                                                                     \
1309     char *p;                                                            \
1310     Py_ssize_t sz;                                                      \
1311     octet b[SZ_##W];                                                    \
1312     if (!PyArg_ParseTuple(arg, "s#:hashbuf" #w, &p, &sz)) goto end;     \
1313     if (sz > MASK##n) TYERR("string too long");                         \
1314     STORE##W(b, sz); poly1305_hash(P1305_CTX(me), b, sizeof(b));        \
1315     poly1305_hash(P1305_CTX(me), p, sz);                                \
1316     RETURN_ME;                                                          \
1317   end:                                                                  \
1318     return (0);                                                         \
1319   }
1320 DOUINTCONV(POLYMETH_HASHBUF_)
1321
1322 static PyObject *polymeth_hashstrz(PyObject *me, PyObject *arg)
1323 {
1324   char *p;
1325   if (!PyArg_ParseTuple(arg, "s:hashstrz", &p)) return (0);
1326   poly1305_hash(P1305_CTX(me), p, strlen(p) + 1);
1327   RETURN_ME;
1328 }
1329
1330 static PyObject *polymeth_flush(PyObject *me, PyObject *arg)
1331 {
1332   if (!PyArg_ParseTuple(arg, ":flush")) return (0);
1333   poly1305_flush(P1305_CTX(me));
1334   RETURN_ME;
1335 }
1336
1337 static PyObject *polymeth_flushzero(PyObject *me, PyObject *arg)
1338 {
1339   if (!PyArg_ParseTuple(arg, ":flushzero")) return (0);
1340   poly1305_flushzero(P1305_CTX(me));
1341   RETURN_ME;
1342 }
1343
1344 static PyObject *polymeth_concat(PyObject *me, PyObject *arg)
1345 {
1346   PyObject *pre, *suff;
1347   if (!PyArg_ParseTuple(arg, "OO:concat", &pre, &suff)) return (0);
1348   if (!PyObject_TypeCheck(pre, poly1305hash_pytype) ||
1349       !PyObject_TypeCheck(suff, poly1305hash_pytype))
1350     TYERR("wanted a poly1305hash");
1351   if (me->ob_type != pre->ob_type || me->ob_type != suff->ob_type)
1352     TYERR("key mismatch");
1353   if (P1305_CTX(pre)->nbuf) VALERR("prefix is not block-aligned");
1354   poly1305_concat(P1305_CTX(me), P1305_CTX(pre), P1305_CTX(suff));
1355   RETURN_ME;
1356 end:
1357   return (0);
1358 }
1359
1360 static PyObject *polymeth_done(PyObject *me, PyObject *arg)
1361 {
1362   PyObject *rc;
1363   if (!PyArg_ParseTuple(arg, ":done")) return (0);
1364   if (!(P1305_F(me) & f_mask)) VALERR("no mask");
1365   rc = bytestring_pywrap(0, POLY1305_TAGSZ);
1366   poly1305_done(P1305_CTX(me), PyString_AS_STRING(rc));
1367   return (rc);
1368 end:
1369   return (0);
1370 }
1371
1372 static PyGetSetDef poly1305cls_pygetset[] = {
1373 #define GETSETNAME(op, name) poly1305cls##op##_##name
1374   GET   (keysz,                 "PC.keysz -> acceptable key sizes")
1375   GET   (masksz,                "PC.masksz -> mask size")
1376   GET   (tagsz,                 "PC.tagsz -> MAC output size")
1377   GET   (name,                  "PC.name -> name of this kind of MAC")
1378 #undef GETSETNAME
1379   { 0 }
1380 };
1381
1382 static PyMethodDef poly1305hash_pymethods[] = {
1383 #define METHNAME(name) polymeth_##name
1384   METH  (copy,                  "P.copy() -> PP")
1385   METH  (hash,                  "P.hash(M)")
1386 #define METHU_(n, W, w) METH(hashu##w, "P.hashu" #w "(WORD)")
1387   DOUINTCONV(METHU_)
1388 #undef METHU_
1389 #define METHBUF_(n, W, w) METH(hashbuf##w, "P.hashbuf" #w "(BYTES)")
1390   DOUINTCONV(METHBUF_)
1391 #undef METHBUF_
1392   METH  (hashstrz,              "P.hashstrz(STRING)")
1393   METH  (flush,                 "P.flush()")
1394   METH  (flushzero,             "P.flushzero()")
1395   METH  (concat,                "P.concat(PREFIX, SUFFIX)")
1396   METH  (done,                  "P.done() -> TAG")
1397 #undef METHNAME
1398   { 0 }
1399 };
1400
1401 static PyTypeObject poly1305cls_pytype_skel = {
1402   PyObject_HEAD_INIT(0) 0,              /* Header */
1403   "Poly1305Class",                      /* @tp_name@ */
1404   sizeof(PyHeapTypeObject),             /* @tp_basicsize@ */
1405   0,                                    /* @tp_itemsize@ */
1406
1407   0,                                    /* @tp_dealloc@ */
1408   0,                                    /* @tp_print@ */
1409   0,                                    /* @tp_getattr@ */
1410   0,                                    /* @tp_setattr@ */
1411   0,                                    /* @tp_compare@ */
1412   0,                                    /* @tp_repr@ */
1413   0,                                    /* @tp_as_number@ */
1414   0,                                    /* @tp_as_sequence@ */
1415   0,                                    /* @tp_as_mapping@ */
1416   0,                                    /* @tp_hash@ */
1417   0,                                    /* @tp_call@ */
1418   0,                                    /* @tp_str@ */
1419   0,                                    /* @tp_getattro@ */
1420   0,                                    /* @tp_setattro@ */
1421   0,                                    /* @tp_as_buffer@ */
1422   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1423     Py_TPFLAGS_BASETYPE,
1424
1425   /* @tp_doc@ */
1426 "Poly1305 metametaclass.  Best not to ask.",
1427
1428   0,                                    /* @tp_traverse@ */
1429   0,                                    /* @tp_clear@ */
1430   0,                                    /* @tp_richcompare@ */
1431   0,                                    /* @tp_weaklistoffset@ */
1432   0,                                    /* @tp_iter@ */
1433   0,                                    /* @tp_iternext@ */
1434   0,                                    /* @tp_methods@ */
1435   0,                                    /* @tp_members@ */
1436   poly1305cls_pygetset,                 /* @tp_getset@ */
1437   0,                                    /* @tp_base@ */
1438   0,                                    /* @tp_dict@ */
1439   0,                                    /* @tp_descr_get@ */
1440   0,                                    /* @tp_descr_set@ */
1441   0,                                    /* @tp_dictoffset@ */
1442   0,                                    /* @tp_init@ */
1443   PyType_GenericAlloc,                  /* @tp_alloc@ */
1444   abstract_pynew,                       /* @tp_new@ */
1445   0,                                    /* @tp_free@ */
1446   0                                     /* @tp_is_gc@ */
1447 };
1448
1449 static PyTypeObject poly1305key_pytype_skel = {
1450   PyObject_HEAD_INIT(0) 0,              /* Header */
1451   "poly1305",                           /* @tp_name@ */
1452   sizeof(poly1305key_pyobj),            /* @tp_basicsize@ */
1453   0,                                    /* @tp_itemsize@ */
1454
1455   0,                                    /* @tp_dealloc@ */
1456   0,                                    /* @tp_print@ */
1457   0,                                    /* @tp_getattr@ */
1458   0,                                    /* @tp_setattr@ */
1459   0,                                    /* @tp_compare@ */
1460   0,                                    /* @tp_repr@ */
1461   0,                                    /* @tp_as_number@ */
1462   0,                                    /* @tp_as_sequence@ */
1463   0,                                    /* @tp_as_mapping@ */
1464   0,                                    /* @tp_hash@ */
1465   0,                                    /* @tp_call@ */
1466   0,                                    /* @tp_str@ */
1467   0,                                    /* @tp_getattro@ */
1468   0,                                    /* @tp_setattro@ */
1469   0,                                    /* @tp_as_buffer@ */
1470   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1471     Py_TPFLAGS_BASETYPE,
1472
1473   /* @tp_doc@ */
1474 "poly1305(K): Poly1305 key.",
1475
1476   0,                                    /* @tp_traverse@ */
1477   0,                                    /* @tp_clear@ */
1478   0,                                    /* @tp_richcompare@ */
1479   0,                                    /* @tp_weaklistoffset@ */
1480   0,                                    /* @tp_iter@ */
1481   0,                                    /* @tp_iternext@ */
1482   0,                                    /* @tp_methods@ */
1483   0,                                    /* @tp_members@ */
1484   0,                                    /* @tp_getset@ */
1485   0,                                    /* @tp_base@ */
1486   0,                                    /* @tp_dict@ */
1487   0,                                    /* @tp_descr_get@ */
1488   0,                                    /* @tp_descr_set@ */
1489   0,                                    /* @tp_dictoffset@ */
1490   0,                                    /* @tp_init@ */
1491   PyType_GenericAlloc,                  /* @tp_alloc@ */
1492   poly1305key_pynew,                    /* @tp_new@ */
1493   0,                                    /* @tp_free@ */
1494   0                                     /* @tp_is_gc@ */
1495 };
1496
1497 static PyTypeObject poly1305hash_pytype_skel = {
1498   PyObject_HEAD_INIT(0) 0,              /* Header */
1499   "Poly1305Hash",                       /* @tp_name@ */
1500   sizeof(poly1305hash_pyobj),           /* @tp_basicsize@ */
1501   0,                                    /* @tp_itemsize@ */
1502
1503   0,                                    /* @tp_dealloc@ */
1504   0,                                    /* @tp_print@ */
1505   0,                                    /* @tp_getattr@ */
1506   0,                                    /* @tp_setattr@ */
1507   0,                                    /* @tp_compare@ */
1508   0,                                    /* @tp_repr@ */
1509   0,                                    /* @tp_as_number@ */
1510   0,                                    /* @tp_as_sequence@ */
1511   0,                                    /* @tp_as_mapping@ */
1512   0,                                    /* @tp_hash@ */
1513   0,                                    /* @tp_call@ */
1514   0,                                    /* @tp_str@ */
1515   0,                                    /* @tp_getattro@ */
1516   0,                                    /* @tp_setattro@ */
1517   0,                                    /* @tp_as_buffer@ */
1518   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1519     Py_TPFLAGS_BASETYPE,
1520
1521   /* @tp_doc@ */
1522 "Poly1305 MAC context base class.",
1523
1524   0,                                    /* @tp_traverse@ */
1525   0,                                    /* @tp_clear@ */
1526   0,                                    /* @tp_richcompare@ */
1527   0,                                    /* @tp_weaklistoffset@ */
1528   0,                                    /* @tp_iter@ */
1529   0,                                    /* @tp_iternext@ */
1530   poly1305hash_pymethods,               /* @tp_methods@ */
1531   0,                                    /* @tp_members@ */
1532   0,                                    /* @tp_getset@ */
1533   0,                                    /* @tp_base@ */
1534   0,                                    /* @tp_dict@ */
1535   0,                                    /* @tp_descr_get@ */
1536   0,                                    /* @tp_descr_set@ */
1537   0,                                    /* @tp_dictoffset@ */
1538   0,                                    /* @tp_init@ */
1539   PyType_GenericAlloc,                  /* @tp_alloc@ */
1540   abstract_pynew,                       /* @tp_new@ */
1541   0,                                    /* @tp_free@ */
1542   0                                     /* @tp_is_gc@ */
1543 };
1544
1545 /*----- Special snowflake for HSalsa and HChaCha --------------------------*/
1546
1547 #define DEF_HDANCE(DANCE, HDANCE, dance, hdance)                        \
1548   static PyObject *meth_##hdance##_prf(PyObject *me, PyObject *arg)     \
1549   {                                                                     \
1550     dance##_ctx dance;                                                  \
1551     char *k, *n;                                                        \
1552     Py_ssize_t ksz, nsz;                                                \
1553     PyObject *rc;                                                       \
1554     if (!PyArg_ParseTuple(arg, "s#s#:" #hdance "_prf",                  \
1555                           &k, &ksz, &n, &nsz))                          \
1556       goto end;                                                         \
1557     if (ksz != DANCE##_KEYSZ) VALERR("bad key length");                 \
1558     if (nsz != HDANCE##_INSZ) VALERR("bad input length");               \
1559     rc = bytestring_pywrap(0, HSALSA20_OUTSZ);                          \
1560     dance##_init(&dance, k, ksz, 0);                                    \
1561     hdance##_prf(&dance, n, PyString_AS_STRING(rc));                    \
1562     return (rc);                                                        \
1563   end:                                                                  \
1564     return (0);                                                         \
1565   }
1566
1567 DEF_HDANCE(SALSA20, HSALSA20, salsa20, hsalsa20)
1568 DEF_HDANCE(SALSA20, HSALSA20, salsa20, hsalsa2012)
1569 DEF_HDANCE(SALSA20, HSALSA20, salsa20, hsalsa208)
1570
1571 DEF_HDANCE(CHACHA, HCHACHA, chacha, hchacha20)
1572 DEF_HDANCE(CHACHA, HCHACHA, chacha, hchacha12)
1573 DEF_HDANCE(CHACHA, HCHACHA, chacha, hchacha8)
1574
1575 /*----- Keccak-p[1600, n] -------------------------------------------------*/
1576
1577 static PyTypeObject *kxvik_pytype;
1578
1579 typedef struct kxvik_pyobj {
1580   PyObject_HEAD
1581   keccak1600_state s;
1582   unsigned n;
1583 } kxvik_pyobj;
1584
1585 static PyObject *kxvik_pynew(PyTypeObject *ty,
1586                                   PyObject *arg, PyObject *kw)
1587 {
1588   unsigned n = 24;
1589   kxvik_pyobj *rc = 0;
1590   static const char *const kwlist[] = { "nround", 0 };
1591   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:new", KWLIST,
1592                                    convuint, &n))
1593     goto end;
1594   rc = (kxvik_pyobj *)ty->tp_alloc(ty, 0);
1595   rc->n = n;
1596   keccak1600_init(&rc->s);
1597 end:
1598   return ((PyObject *)rc);
1599 }
1600
1601 static PyObject *kxvikmeth_mix(PyObject *me, PyObject *arg)
1602 {
1603   kxvik_pyobj *k = (kxvik_pyobj *)me;
1604   kludge64 t[25];
1605   const octet *q;
1606   octet buf[8];
1607   unsigned i;
1608   char *p; Py_ssize_t n;
1609
1610   if (!PyArg_ParseTuple(arg, "s#:mix", &p, &n)) goto end;
1611   if (n > 200) VALERR("out of range");
1612   q = (const octet *)p;
1613   i = 0;
1614   while (n > 8) { LOAD64_L_(t[i], q); i++; q += 8; n -= 8; }
1615   if (n) {
1616     memcpy(buf, q, n); memset(buf + n, 0, 8 - n);
1617     LOAD64_L_(t[i], buf); i++;
1618   }
1619   keccak1600_mix(&k->s, t, i);
1620   RETURN_ME;
1621 end:
1622   return (0);
1623 }
1624
1625 static PyObject *kxvikmeth_extract(PyObject *me, PyObject *arg)
1626 {
1627   kxvik_pyobj *k = (kxvik_pyobj *)me;
1628   PyObject *rc = 0;
1629   kludge64 t[25];
1630   octet *q, buf[8];
1631   unsigned i;
1632   unsigned n;
1633
1634   if (!PyArg_ParseTuple(arg, "O&:mix", convuint, &n)) goto end;
1635   if (n > 200) VALERR("out of range");
1636   rc = bytestring_pywrap(0, n);
1637   q = (octet *)PyString_AS_STRING(rc);
1638   keccak1600_extract(&k->s, t, (n + 7)/8);
1639   i = 0;
1640   while (n > 8) { STORE64_L_(q, t[i]); i++; q += 8; n -= 8; }
1641   if (n) { STORE64_L_(buf, t[i]); memcpy(q, buf, n); }
1642 end:
1643   return (rc);
1644 }
1645
1646 static PyObject *kxvikmeth_step(PyObject *me, PyObject *arg)
1647 {
1648   kxvik_pyobj *k = (kxvik_pyobj *)me;
1649   if (!PyArg_ParseTuple(arg, ":step")) return (0);
1650   keccak1600_p(&k->s, &k->s, k->n);
1651   RETURN_ME;
1652 }
1653
1654 static PyObject *kxvikget_nround(PyObject *me, void *hunoz)
1655 {
1656   kxvik_pyobj *k = (kxvik_pyobj *)me;
1657   return (PyInt_FromLong(k->n));
1658 }
1659
1660 static int kxvikset_nround(PyObject *me, PyObject *val, void *hunoz)
1661 {
1662   kxvik_pyobj *k = (kxvik_pyobj *)me;
1663   unsigned n;
1664
1665   if (!convuint(val, &n)) return (-1);
1666   k->n = n;
1667   return (0);
1668 }
1669
1670 static PyGetSetDef kxvik_pygetset[] = {
1671 #define GETSETNAME(op, name) kxvik##op##_##name
1672   GETSET(nround,                "KECCAK.nround -> number of rounds")
1673 #undef GETSETNAME
1674   { 0 }
1675 };
1676
1677 static PyMethodDef kxvik_pymethods[] = {
1678 #define METHNAME(func) kxvikmeth_##func
1679   METH  (mix,                   "KECCAK.mix(DATA)")
1680   METH  (extract,               "KECCAK.extract(NOCTETS)")
1681   METH  (step,                  "KECCAK.step()")
1682 #undef METHNAME
1683   { 0 }
1684 };
1685
1686 static PyTypeObject kxvik_pytype_skel = {
1687   PyObject_HEAD_INIT(0) 0,              /* Header */
1688   "Keccak1600",                         /* @tp_name@ */
1689   sizeof(kxvik_pyobj),                  /* @tp_basicsize@ */
1690   0,                                    /* @tp_itemsize@ */
1691
1692   0,                                    /* @tp_dealloc@ */
1693   0,                                    /* @tp_print@ */
1694   0,                                    /* @tp_getattr@ */
1695   0,                                    /* @tp_setattr@ */
1696   0,                                    /* @tp_compare@ */
1697   0,                                    /* @tp_repr@ */
1698   0,                                    /* @tp_as_number@ */
1699   0,                                    /* @tp_as_sequence@ */
1700   0,                                    /* @tp_as_mapping@ */
1701   0,                                    /* @tp_hash@ */
1702   0,                                    /* @tp_call@ */
1703   0,                                    /* @tp_str@ */
1704   0,                                    /* @tp_getattro@ */
1705   0,                                    /* @tp_setattro@ */
1706   0,                                    /* @tp_as_buffer@ */
1707   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1708     Py_TPFLAGS_BASETYPE,
1709
1710   /* @tp_doc@ */
1711 "Keccak1600([nround = 24]): Keccak-p[1600, n] state.",
1712
1713   0,                                    /* @tp_traverse@ */
1714   0,                                    /* @tp_clear@ */
1715   0,                                    /* @tp_richcompare@ */
1716   0,                                    /* @tp_weaklistoffset@ */
1717   0,                                    /* @tp_iter@ */
1718   0,                                    /* @tp_iternext@ */
1719   kxvik_pymethods,                      /* @tp_methods@ */
1720   0,                                    /* @tp_members@ */
1721   kxvik_pygetset,                       /* @tp_getset@ */
1722   0,                                    /* @tp_base@ */
1723   0,                                    /* @tp_dict@ */
1724   0,                                    /* @tp_descr_get@ */
1725   0,                                    /* @tp_descr_set@ */
1726   0,                                    /* @tp_dictoffset@ */
1727   0,                                    /* @tp_init@ */
1728   PyType_GenericAlloc,                  /* @tp_alloc@ */
1729   kxvik_pynew,                          /* @tp_new@ */
1730   0,                                    /* @tp_free@ */
1731   0                                     /* @tp_is_gc@ */
1732 };
1733
1734 static PyTypeObject *shake_pytype, *shake128_pytype, *shake256_pytype;
1735
1736 typedef struct shake_pyobj {
1737   PyObject_HEAD
1738   int st;
1739   shake_ctx h;
1740 } shake_pyobj;
1741
1742 #define SHAKE_H(o) (&((shake_pyobj *)(o))->h)
1743 #define SHAKE_ST(o) (((shake_pyobj *)(o))->st)
1744
1745 static PyObject *shake_dopynew(void (*initfn)(shake_ctx *,
1746                                               const void *, size_t,
1747                                               const void *, size_t),
1748                                PyTypeObject *ty,
1749                                PyObject *arg, PyObject *kw)
1750 {
1751   shake_pyobj *rc = 0;
1752   char *p = 0, *f = 0;
1753   Py_ssize_t psz = 0, fsz = 0;
1754   static const char *const kwlist[] = { "perso", "func", 0 };
1755
1756   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|s#s#:new", KWLIST,
1757                                    &p, &psz, &f, &fsz))
1758     goto end;
1759   rc = (shake_pyobj *)ty->tp_alloc(ty, 0);
1760   initfn(&rc->h, f, fsz, p, psz);
1761   rc->st = 0;
1762 end:
1763   return ((PyObject *)rc);
1764 }
1765
1766 static PyObject *shake128_pynew(PyTypeObject *ty,
1767                                 PyObject *arg, PyObject *kw)
1768   { return (shake_dopynew(cshake128_init, ty, arg, kw)); }
1769
1770 static PyObject *shake256_pynew(PyTypeObject *ty,
1771                                 PyObject *arg, PyObject *kw)
1772   { return (shake_dopynew(cshake256_init, ty, arg, kw)); }
1773
1774 static int shake_check(PyObject *me, int st)
1775 {
1776   if (SHAKE_ST(me) != st) VALERR("wrong state");
1777   return (0);
1778 end:
1779   return (-1);
1780 }
1781
1782 static PyObject *shakemeth_hash(PyObject *me, PyObject *arg)
1783 {
1784   char *p;
1785   Py_ssize_t sz;
1786   if (!PyArg_ParseTuple(arg, "s#:hash", &p, &sz)) return (0);
1787   if (shake_check(me, 0)) return (0);
1788   shake_hash(SHAKE_H(me), p, sz);
1789   RETURN_ME;
1790 }
1791
1792 #define SHAKEMETH_HASHU_(n, W, w)                                       \
1793   static PyObject *shakemeth_hashu##w(PyObject *me, PyObject *arg)      \
1794   {                                                                     \
1795     uint##n x;                                                          \
1796     octet b[SZ_##W];                                                    \
1797     if (!PyArg_ParseTuple(arg, "O&:hashu" #w, convu##n, &x)) return (0); \
1798     if (shake_check(me, 0)) return (0);                                 \
1799     STORE##W(b, x); shake_hash(SHAKE_H(me), b, sizeof(b));              \
1800     RETURN_ME;                                                          \
1801   }
1802 DOUINTCONV(SHAKEMETH_HASHU_)
1803
1804 #define SHAKEMETH_HASHBUF_(n, W, w)                                     \
1805   static PyObject *shakemeth_hashbuf##w(PyObject *me, PyObject *arg)    \
1806   {                                                                     \
1807     char *p;                                                            \
1808     Py_ssize_t sz;                                                      \
1809     octet b[SZ_##W];                                                    \
1810     if (!PyArg_ParseTuple(arg, "s#:hashbuf" #w, &p, &sz)) goto end;     \
1811     if (sz > MASK##n) TYERR("string too long");                         \
1812     if (shake_check(me, 0)) goto end;                                   \
1813     STORE##W(b, sz); shake_hash(SHAKE_H(me), b, sizeof(b));             \
1814     shake_hash(SHAKE_H(me), p, sz);                                     \
1815     RETURN_ME;                                                          \
1816   end:                                                                  \
1817     return (0);                                                         \
1818   }
1819 DOUINTCONV(SHAKEMETH_HASHBUF_)
1820
1821 static PyObject *shakemeth_hashstrz(PyObject *me, PyObject *arg)
1822 {
1823   char *p;
1824   if (!PyArg_ParseTuple(arg, "s:hashstrz", &p)) return (0);
1825   if (shake_check(me, 0)) return (0);
1826   shake_hash(SHAKE_H(me), p, strlen(p) + 1);
1827   RETURN_ME;
1828 }
1829
1830 static PyObject *shakemeth_xof(PyObject *me, PyObject *arg)
1831 {
1832   if (!PyArg_ParseTuple(arg, ":xof")) goto end;
1833   if (shake_check(me, 0)) goto end;
1834   shake_xof(SHAKE_H(me));
1835   SHAKE_ST(me) = 1;
1836   RETURN_ME;
1837 end:
1838   return (0);
1839 }
1840
1841 static PyObject *shakemeth_done(PyObject *me, PyObject *arg)
1842 {
1843   PyObject *rc = 0;
1844   size_t n;
1845   if (!PyArg_ParseTuple(arg, "O&:done", convszt, &n)) goto end;
1846   if (shake_check(me, 0)) goto end;
1847   rc = bytestring_pywrap(0, n);
1848   shake_done(SHAKE_H(me), PyString_AS_STRING(rc), n);
1849   SHAKE_ST(me) = -1;
1850 end:
1851   return (rc);
1852 }
1853
1854 static PyObject *shakemeth_copy(PyObject *me, PyObject *arg)
1855 {
1856   shake_pyobj *rc = 0;
1857
1858   if (!PyArg_ParseTuple(arg, ":copy")) goto end;
1859   rc = PyObject_NEW(shake_pyobj, me->ob_type);
1860   rc->h = *SHAKE_H(me);
1861   rc->st = SHAKE_ST(me);
1862 end:
1863   return ((PyObject *)me);
1864 }
1865
1866 static PyObject *shakemeth_get(PyObject *me, PyObject *arg)
1867 {
1868   PyObject *rc = 0;
1869   size_t sz;
1870
1871   if (!PyArg_ParseTuple(arg, "O&:get", convszt, &sz)) goto end;
1872   if (shake_check(me, 1)) goto end;
1873   rc = bytestring_pywrap(0, sz);
1874   shake_get(SHAKE_H(me), PyString_AS_STRING(rc), sz);
1875 end:
1876   return (rc);
1877 }
1878
1879 static PyObject *shakemeth_mask(PyObject *me, PyObject *arg)
1880 {
1881   PyObject *rc = 0;
1882   char *p; Py_ssize_t sz;
1883
1884   if (!PyArg_ParseTuple(arg, "s#:mask", &p, &sz)) goto end;
1885   if (shake_check(me, 1)) goto end;
1886   rc = bytestring_pywrap(0, sz);
1887   shake_mask(SHAKE_H(me), p, PyString_AS_STRING(rc), sz);
1888 end:
1889   return (rc);
1890 }
1891
1892 static PyObject *shakeget_rate(PyObject *me, void *hunoz)
1893   { return (PyInt_FromLong(SHAKE_H(me)->h.r)); }
1894
1895 static PyObject *shakeget_buffered(PyObject *me, void *hunoz)
1896   { return (PyInt_FromLong(SHAKE_H(me)->h.n)); }
1897
1898 static PyObject *shakeget_state(PyObject *me, void *hunoz)
1899 {
1900   int st = SHAKE_ST(me);
1901   return (PyString_FromString(st == 0 ? "absorb" :
1902                               st == 1 ? "squeeze" : "dead"));
1903 }
1904
1905 static PyGetSetDef shake_pygetset[] = {
1906 #define GETSETNAME(op, name) shake##op##_##name
1907   GET   (rate,                  "S.rate -> rate, in bytes")
1908   GET   (buffered,              "S.buffered -> amount currently buffered")
1909   GET   (state,                 "S.state -> `absorb', `squeeze', `dead'")
1910 #undef GETSETNAME
1911   { 0 }
1912 };
1913
1914 static PyMethodDef shake_pymethods[] = {
1915 #define METHNAME(func) shakemeth_##func
1916   METH  (copy,                  "S.copy() -> SS")
1917   METH  (hash,                  "S.hash(M)")
1918 #define METHU_(n, W, w) METH(hashu##w, "S.hashu" #w "(WORD)")
1919   DOUINTCONV(METHU_)
1920 #undef METHU_
1921 #define METHBUF_(n, W, w) METH(hashbuf##w, "S.hashbuf" #w "(BYTES)")
1922   DOUINTCONV(METHBUF_)
1923 #undef METHBUF_
1924   METH  (hashstrz,              "S.hashstrz(STRING)")
1925   METH  (xof,                   "S.xof()")
1926   METH  (done,                  "S.done(LEN) ->H")
1927   METH  (get,                   "S.get(LEN) -> H")
1928   METH  (mask,                  "S.mask(M) -> C")
1929 #undef METHNAME
1930   { 0 }
1931 };
1932
1933 static PyTypeObject shake_pytype_skel = {
1934   PyObject_HEAD_INIT(0) 0,              /* Header */
1935   "Shake",                              /* @tp_name@ */
1936   sizeof(shake_pyobj),                  /* @tp_basicsize@ */
1937   0,                                    /* @tp_itemsize@ */
1938
1939   0,                                    /* @tp_dealloc@ */
1940   0,                                    /* @tp_print@ */
1941   0,                                    /* @tp_getattr@ */
1942   0,                                    /* @tp_setattr@ */
1943   0,                                    /* @tp_compare@ */
1944   0,                                    /* @tp_repr@ */
1945   0,                                    /* @tp_as_number@ */
1946   0,                                    /* @tp_as_sequence@ */
1947   0,                                    /* @tp_as_mapping@ */
1948   0,                                    /* @tp_hash@ */
1949   0,                                    /* @tp_call@ */
1950   0,                                    /* @tp_str@ */
1951   0,                                    /* @tp_getattro@ */
1952   0,                                    /* @tp_setattro@ */
1953   0,                                    /* @tp_as_buffer@ */
1954   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1955     Py_TPFLAGS_BASETYPE,
1956
1957   /* @tp_doc@ */
1958 "SHAKE/cSHAKE base class.",
1959
1960   0,                                    /* @tp_traverse@ */
1961   0,                                    /* @tp_clear@ */
1962   0,                                    /* @tp_richcompare@ */
1963   0,                                    /* @tp_weaklistoffset@ */
1964   0,                                    /* @tp_iter@ */
1965   0,                                    /* @tp_iternext@ */
1966   shake_pymethods,                      /* @tp_methods@ */
1967   0,                                    /* @tp_members@ */
1968   shake_pygetset,                       /* @tp_getset@ */
1969   0,                                    /* @tp_base@ */
1970   0,                                    /* @tp_dict@ */
1971   0,                                    /* @tp_descr_get@ */
1972   0,                                    /* @tp_descr_set@ */
1973   0,                                    /* @tp_dictoffset@ */
1974   0,                                    /* @tp_init@ */
1975   PyType_GenericAlloc,                  /* @tp_alloc@ */
1976   abstract_pynew,                       /* @tp_new@ */
1977   0,                                    /* @tp_free@ */
1978   0                                     /* @tp_is_gc@ */
1979 };
1980
1981 static PyTypeObject shake128_pytype_skel = {
1982   PyObject_HEAD_INIT(0) 0,              /* Header */
1983   "Shake128",                           /* @tp_name@ */
1984   0,                                    /* @tp_basicsize@ */
1985   0,                                    /* @tp_itemsize@ */
1986
1987   0,                                    /* @tp_dealloc@ */
1988   0,                                    /* @tp_print@ */
1989   0,                                    /* @tp_getattr@ */
1990   0,                                    /* @tp_setattr@ */
1991   0,                                    /* @tp_compare@ */
1992   0,                                    /* @tp_repr@ */
1993   0,                                    /* @tp_as_number@ */
1994   0,                                    /* @tp_as_sequence@ */
1995   0,                                    /* @tp_as_mapping@ */
1996   0,                                    /* @tp_hash@ */
1997   0,                                    /* @tp_call@ */
1998   0,                                    /* @tp_str@ */
1999   0,                                    /* @tp_getattro@ */
2000   0,                                    /* @tp_setattro@ */
2001   0,                                    /* @tp_as_buffer@ */
2002   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2003     Py_TPFLAGS_BASETYPE,
2004
2005   /* @tp_doc@ */
2006 "Shake128([perso = STR], [func = STR]): SHAKE128/cSHAKE128 XOF.",
2007
2008   0,                                    /* @tp_traverse@ */
2009   0,                                    /* @tp_clear@ */
2010   0,                                    /* @tp_richcompare@ */
2011   0,                                    /* @tp_weaklistoffset@ */
2012   0,                                    /* @tp_iter@ */
2013   0,                                    /* @tp_iternext@ */
2014   0,                                    /* @tp_methods@ */
2015   0,                                    /* @tp_members@ */
2016   0,                                    /* @tp_getset@ */
2017   0,                                    /* @tp_base@ */
2018   0,                                    /* @tp_dict@ */
2019   0,                                    /* @tp_descr_get@ */
2020   0,                                    /* @tp_descr_set@ */
2021   0,                                    /* @tp_dictoffset@ */
2022   0,                                    /* @tp_init@ */
2023   PyType_GenericAlloc,                  /* @tp_alloc@ */
2024   shake128_pynew,                       /* @tp_new@ */
2025   0,                                    /* @tp_free@ */
2026   0                                     /* @tp_is_gc@ */
2027 };
2028
2029 static PyTypeObject shake256_pytype_skel = {
2030   PyObject_HEAD_INIT(0) 0,              /* Header */
2031   "Shake256",                           /* @tp_name@ */
2032   0,                                    /* @tp_basicsize@ */
2033   0,                                    /* @tp_itemsize@ */
2034
2035   0,                                    /* @tp_dealloc@ */
2036   0,                                    /* @tp_print@ */
2037   0,                                    /* @tp_getattr@ */
2038   0,                                    /* @tp_setattr@ */
2039   0,                                    /* @tp_compare@ */
2040   0,                                    /* @tp_repr@ */
2041   0,                                    /* @tp_as_number@ */
2042   0,                                    /* @tp_as_sequence@ */
2043   0,                                    /* @tp_as_mapping@ */
2044   0,                                    /* @tp_hash@ */
2045   0,                                    /* @tp_call@ */
2046   0,                                    /* @tp_str@ */
2047   0,                                    /* @tp_getattro@ */
2048   0,                                    /* @tp_setattro@ */
2049   0,                                    /* @tp_as_buffer@ */
2050   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2051     Py_TPFLAGS_BASETYPE,
2052
2053   /* @tp_doc@ */
2054 "Shake256([perso = STR], [func = STR]): SHAKE256/cSHAKE256 XOF.",
2055
2056   0,                                    /* @tp_traverse@ */
2057   0,                                    /* @tp_clear@ */
2058   0,                                    /* @tp_richcompare@ */
2059   0,                                    /* @tp_weaklistoffset@ */
2060   0,                                    /* @tp_iter@ */
2061   0,                                    /* @tp_iternext@ */
2062   0,                                    /* @tp_methods@ */
2063   0,                                    /* @tp_members@ */
2064   0,                                    /* @tp_getset@ */
2065   0,                                    /* @tp_base@ */
2066   0,                                    /* @tp_dict@ */
2067   0,                                    /* @tp_descr_get@ */
2068   0,                                    /* @tp_descr_set@ */
2069   0,                                    /* @tp_dictoffset@ */
2070   0,                                    /* @tp_init@ */
2071   PyType_GenericAlloc,                  /* @tp_alloc@ */
2072   shake256_pynew,                       /* @tp_new@ */
2073   0,                                    /* @tp_free@ */
2074   0                                     /* @tp_is_gc@ */
2075 };
2076
2077 /*----- Pseudorandom permutations -----------------------------------------*/
2078
2079 static PyTypeObject *gcprp_pytype, *gprp_pytype;
2080
2081 typedef struct prpinfo {
2082   const char *name;
2083   const octet *keysz;
2084   size_t ctxsz;
2085   size_t blksz;
2086   void (*init)(void *, const void *, size_t);
2087   void (*eblk)(void *, const void *, void *);
2088   void (*dblk)(void *, const void *, void *);
2089 } prpinfo;
2090
2091 #define PRP_DEF(PRE, pre)                                               \
2092   static void pre##_prpinit(void *ctx, const void *k, size_t ksz)       \
2093     { pre##_init(ctx, k, ksz); }                                        \
2094   static void pre##_prpeblk(void *ctx, const void *in, void *out)       \
2095   {                                                                     \
2096     uint32 w[PRE##_BLKSZ/4]; BLKC_LOAD(PRE, w, in);                     \
2097     pre##_eblk(ctx, w, w); BLKC_STORE(PRE, out, w);                     \
2098   }                                                                     \
2099   static void pre##_prpdblk(void *ctx, const void *in, void *out)       \
2100   {                                                                     \
2101     uint32 w[PRE##_BLKSZ/4]; BLKC_LOAD(PRE, w, in);                     \
2102     pre##_dblk(ctx, w, w); BLKC_STORE(PRE, out, w);                     \
2103   }                                                                     \
2104   static const prpinfo pre##_prpinfo = {                                \
2105     #pre, pre##_keysz, sizeof(pre##_ctx), PRE##_BLKSZ,                  \
2106     pre##_prpinit, pre##_prpeblk, pre##_prpdblk                         \
2107   };
2108 PRPS(PRP_DEF)
2109
2110 static const struct prpinfo *const gprptab[] = {
2111 #define PRP_ENTRY(PRE, pre) &pre##_prpinfo,
2112   PRPS(PRP_ENTRY)
2113   0
2114 };
2115
2116 typedef struct gcprp_pyobj {
2117   PyHeapTypeObject ty;
2118   const prpinfo *prp;
2119 } gcprp_pyobj;
2120 #define GCPRP_PRP(o) (((gcprp_pyobj *)(o))->prp)
2121
2122 typedef struct gprp_pyobj {
2123   PyObject_HEAD
2124   const prpinfo *prp;
2125 } gprp_pyobj;
2126 #define GPRP_PRP(o) (((gprp_pyobj *)(o))->prp)
2127 #define GPRP_CTX(o) (((gprp_pyobj *)(o)) + 1)
2128
2129 typedef struct prp {
2130   const prpinfo *prp;
2131   void *ctx;
2132 } prp;
2133
2134 static PyObject *gprp_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
2135 {
2136   static const char *const kwlist[] = { "key", 0 };
2137   char *k;
2138   Py_ssize_t sz;
2139   const prpinfo *prp = GCPRP_PRP(ty);
2140   PyObject *me;
2141
2142   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &k, &sz))
2143     goto end;
2144   if (keysz(sz, prp->keysz) != sz) VALERR("bad key length");
2145   me = (PyObject *)ty->tp_alloc(ty, 0);
2146   GPRP_PRP(me) = prp;
2147   prp->init(GPRP_CTX(me), k, sz);
2148   Py_INCREF(me);
2149   return (me);
2150 end:
2151   return (0);
2152 }
2153
2154 static void gprp_pydealloc(PyObject *me)
2155   { Py_DECREF(me->ob_type); FREEOBJ(me); }
2156
2157 static PyObject *gcprp_pywrap(const prpinfo *prp)
2158 {
2159   gcprp_pyobj *g = newtype(gcprp_pytype, 0, prp->name);
2160   g->prp = prp;
2161   g->ty.ht_type.tp_basicsize = sizeof(gprp_pyobj) + prp->ctxsz;
2162   g->ty.ht_type.tp_base = gprp_pytype;
2163   Py_INCREF(gprp_pytype);
2164   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
2165                             Py_TPFLAGS_BASETYPE |
2166                             Py_TPFLAGS_HEAPTYPE);
2167   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
2168   g->ty.ht_type.tp_free = 0;
2169   g->ty.ht_type.tp_new = gprp_pynew;
2170   typeready(&g->ty.ht_type);
2171   return ((PyObject *)g);
2172 }
2173
2174 static PyObject *gcpget_name(PyObject *me, void *hunoz)
2175   { return (PyString_FromString(GCPRP_PRP(me)->name)); }
2176 static PyObject *gcpget_keysz(PyObject *me, void *hunoz)
2177   { return (keysz_pywrap(GCPRP_PRP(me)->keysz)); }
2178 static PyObject *gcpget_blksz(PyObject *me, void *hunoz)
2179   { return (PyInt_FromLong(GCPRP_PRP(me)->blksz)); }
2180
2181 static PyObject *gpmeth_encrypt(PyObject *me, PyObject *arg)
2182 {
2183   char *p;
2184   Py_ssize_t n;
2185   PyObject *rc = 0;
2186
2187   if (!PyArg_ParseTuple(arg, "s#:encrypt", &p, &n)) goto end;
2188   if (n != GPRP_PRP(me)->blksz) VALERR("incorrect block length");
2189   rc = bytestring_pywrap(0, n);
2190   GPRP_PRP(me)->eblk(GPRP_CTX(me), p, PyString_AS_STRING(rc));
2191 end:
2192   return (rc);
2193 }
2194
2195 static PyObject *gpmeth_decrypt(PyObject *me, PyObject *arg)
2196 {
2197   char *p;
2198   Py_ssize_t n;
2199   PyObject *rc = 0;
2200
2201   if (!PyArg_ParseTuple(arg, "s#:decrypt", &p, &n)) goto end;
2202   if (n != GPRP_PRP(me)->blksz) VALERR("incorrect block length");
2203   rc = bytestring_pywrap(0, n);
2204   GPRP_PRP(me)->dblk(GPRP_CTX(me), p, PyString_AS_STRING(rc));
2205 end:
2206   return (rc);
2207 }
2208
2209 static PyGetSetDef gcprp_pygetset[] = {
2210 #define GETSETNAME(op, name) gcp##op##_##name
2211   GET   (keysz,                 "CP.keysz -> acceptable key sizes")
2212   GET   (blksz,                 "CP.blksz -> block size")
2213   GET   (name,                  "CP.name -> name of this kind of PRP")
2214 #undef GETSETNAME
2215   { 0 }
2216 };
2217
2218 static PyMethodDef gprp_pymethods[] = {
2219 #define METHNAME(name) gpmeth_##name
2220   METH  (encrypt,               "P.encrypt(PT) -> CT")
2221   METH  (decrypt,               "P.decrypt(CT) -> PT")
2222 #undef METHNAME
2223   { 0 }
2224 };
2225
2226 static PyTypeObject gcprp_pytype_skel = {
2227   PyObject_HEAD_INIT(0) 0,              /* Header */
2228   "GCPRP",                              /* @tp_name@ */
2229   sizeof(gcprp_pyobj),                  /* @tp_basicsize@ */
2230   0,                                    /* @tp_itemsize@ */
2231
2232   0,                                    /* @tp_dealloc@ */
2233   0,                                    /* @tp_print@ */
2234   0,                                    /* @tp_getattr@ */
2235   0,                                    /* @tp_setattr@ */
2236   0,                                    /* @tp_compare@ */
2237   0,                                    /* @tp_repr@ */
2238   0,                                    /* @tp_as_number@ */
2239   0,                                    /* @tp_as_sequence@ */
2240   0,                                    /* @tp_as_mapping@ */
2241   0,                                    /* @tp_hash@ */
2242   0,                                    /* @tp_call@ */
2243   0,                                    /* @tp_str@ */
2244   0,                                    /* @tp_getattro@ */
2245   0,                                    /* @tp_setattro@ */
2246   0,                                    /* @tp_as_buffer@ */
2247   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2248     Py_TPFLAGS_BASETYPE,
2249
2250   /* @tp_doc@ */
2251 "Pseudorandom permutation metaclass.",
2252
2253   0,                                    /* @tp_traverse@ */
2254   0,                                    /* @tp_clear@ */
2255   0,                                    /* @tp_richcompare@ */
2256   0,                                    /* @tp_weaklistoffset@ */
2257   0,                                    /* @tp_iter@ */
2258   0,                                    /* @tp_iternext@ */
2259   0,                                    /* @tp_methods@ */
2260   0,                                    /* @tp_members@ */
2261   gcprp_pygetset,                       /* @tp_getset@ */
2262   0,                                    /* @tp_base@ */
2263   0,                                    /* @tp_dict@ */
2264   0,                                    /* @tp_descr_get@ */
2265   0,                                    /* @tp_descr_set@ */
2266   0,                                    /* @tp_dictoffset@ */
2267   0,                                    /* @tp_init@ */
2268   PyType_GenericAlloc,                  /* @tp_alloc@ */
2269   abstract_pynew,                       /* @tp_new@ */
2270   0,                                    /* @tp_free@ */
2271   0                                     /* @tp_is_gc@ */
2272 };
2273
2274 static PyTypeObject gprp_pytype_skel = {
2275   PyObject_HEAD_INIT(0) 0,              /* Header */
2276   "GPRP",                               /* @tp_name@ */
2277   sizeof(gprp_pyobj),                   /* @tp_basicsize@ */
2278   0,                                    /* @tp_itemsize@ */
2279
2280   gprp_pydealloc,                       /* @tp_dealloc@ */
2281   0,                                    /* @tp_print@ */
2282   0,                                    /* @tp_getattr@ */
2283   0,                                    /* @tp_setattr@ */
2284   0,                                    /* @tp_compare@ */
2285   0,                                    /* @tp_repr@ */
2286   0,                                    /* @tp_as_number@ */
2287   0,                                    /* @tp_as_sequence@ */
2288   0,                                    /* @tp_as_mapping@ */
2289   0,                                    /* @tp_hash@ */
2290   0,                                    /* @tp_call@ */
2291   0,                                    /* @tp_str@ */
2292   0,                                    /* @tp_getattro@ */
2293   0,                                    /* @tp_setattro@ */
2294   0,                                    /* @tp_as_buffer@ */
2295   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
2296     Py_TPFLAGS_BASETYPE,
2297
2298   /* @tp_doc@ */
2299 "Pseudorandom permutation, abstract base class.",
2300
2301   0,                                    /* @tp_traverse@ */
2302   0,                                    /* @tp_clear@ */
2303   0,                                    /* @tp_richcompare@ */
2304   0,                                    /* @tp_weaklistoffset@ */
2305   0,                                    /* @tp_iter@ */
2306   0,                                    /* @tp_iternext@ */
2307   gprp_pymethods,                       /* @tp_methods@ */
2308   0,                                    /* @tp_members@ */
2309   0,                                    /* @tp_getset@ */
2310   0,                                    /* @tp_base@ */
2311   0,                                    /* @tp_dict@ */
2312   0,                                    /* @tp_descr_get@ */
2313   0,                                    /* @tp_descr_set@ */
2314   0,                                    /* @tp_dictoffset@ */
2315   0,                                    /* @tp_init@ */
2316   PyType_GenericAlloc,                  /* @tp_alloc@ */
2317   abstract_pynew,                       /* @tp_new@ */
2318   0,                                    /* @tp_free@ */
2319   0                                     /* @tp_is_gc@ */
2320 };
2321
2322 /*----- Main code ---------------------------------------------------------*/
2323
2324 static PyMethodDef methods[] = {
2325 #define METHNAME(func) meth_##func
2326   METH  (_KeySZ_fromdl,         "\
2327 fromdl(N) -> M: convert integer discrete log field size to work factor")
2328   METH  (_KeySZ_fromschnorr,    "\
2329 fromschnorr(N) -> M: convert Schnorr group order to work factor")
2330   METH  (_KeySZ_fromif,         "\
2331 fromif(N) -> M: convert integer factorization problem size to work factor")
2332   METH  (_KeySZ_fromec,         "\
2333 fromec(N) -> M: convert elliptic curve group order to work factor")
2334   METH  (_KeySZ_todl,           "\
2335 todl(N) -> M: convert work factor to integer discrete log field size")
2336   METH  (_KeySZ_toschnorr,      "\
2337 toschnorr(N) -> M: convert work factor to Schnorr group order")
2338   METH  (_KeySZ_toif,           "\
2339 toif(N) -> M: convert work factor to integer factorization problem size")
2340   METH  (_KeySZ_toec,           "\
2341 toec(N) -> M: convert work factor to elliptic curve group order")
2342   METH  (_KeySZ_toec,           "\
2343 toec(N) -> M: convert work factor to elliptic curve group order")
2344 #define METH_HDANCE(hdance, HDance) METH(hdance##_prf, "\
2345 " #hdance "_prf(K, N) -> H: calculate " HDance " hash of N with K")
2346   METH_HDANCE(hsalsa20, "HSalsa20")
2347   METH_HDANCE(hsalsa2012, "HSalsa20/12")
2348   METH_HDANCE(hsalsa208, "HSalsa20/8")
2349   METH_HDANCE(hchacha20, "HChaCha20")
2350   METH_HDANCE(hchacha12, "HChaCha12")
2351   METH_HDANCE(hchacha8, "HChaCha8")
2352 #undef METH_DANCE
2353 #undef METHNAME
2354   { 0 }
2355 };
2356
2357 void algorithms_pyinit(void)
2358 {
2359   INITTYPE(keysz, root);
2360   INITTYPE(keyszany, keysz);
2361   INITTYPE(keyszrange, keysz);
2362   INITTYPE(keyszset, keysz);
2363   INITTYPE(gccipher, type);
2364   INITTYPE(gcipher, root);
2365   INITTYPE(gchash, type);
2366   INITTYPE(ghash, root);
2367   INITTYPE(gcmac, type);
2368   INITTYPE(gmac, type);
2369   INITTYPE(gmhash, ghash);
2370   INITTYPE(poly1305cls, type);
2371   INITTYPE_META(poly1305key, type, poly1305cls);
2372   INITTYPE(poly1305hash, root);
2373   INITTYPE(kxvik, root);
2374   INITTYPE(shake, root);
2375   INITTYPE(shake128, shake);
2376   INITTYPE(shake256, shake);
2377   INITTYPE(gcprp, type);
2378   INITTYPE(gprp, root);
2379   addmethods(methods);
2380 }
2381
2382 GEN(gcciphers, cipher)
2383 GEN(gchashes, hash)
2384 GEN(gcmacs, mac)
2385 #define gcprp prpinfo
2386 GEN(gcprps, prp)
2387
2388 void algorithms_pyinsert(PyObject *mod)
2389 {
2390   PyObject *d;
2391   INSERT("KeySZ", keysz_pytype);
2392   INSERT("KeySZAny", keyszany_pytype);
2393   INSERT("KeySZRange", keyszrange_pytype);
2394   INSERT("KeySZSet", keyszset_pytype);
2395   INSERT("GCCipher", gccipher_pytype);
2396   INSERT("GCipher", gcipher_pytype);
2397   INSERT("gcciphers", gcciphers());
2398   INSERT("GCHash", gchash_pytype);
2399   INSERT("GHash", ghash_pytype);
2400   INSERT("gchashes", d = gchashes());
2401   sha_pyobj = PyDict_GetItemString(d, "sha"); Py_INCREF(sha_pyobj);
2402   has160_pyobj = PyDict_GetItemString(d, "has160"); Py_INCREF(has160_pyobj);
2403   INSERT("GCMAC", gcmac_pytype);
2404   INSERT("GMAC", gmac_pytype);
2405   INSERT("GMACHash", gmhash_pytype);
2406   INSERT("gcmacs", gcmacs());
2407   INSERT("Poly1305Class", poly1305cls_pytype);
2408   INSERT("poly1305", poly1305key_pytype);
2409   INSERT("Poly1305Hash", poly1305hash_pytype);
2410   INSERT("Keccak1600", kxvik_pytype);
2411   INSERT("Shake", shake_pytype);
2412   INSERT("Shake128", shake128_pytype);
2413   INSERT("Shake256", shake256_pytype);
2414   INSERT("GCPRP", gcprp_pytype);
2415   INSERT("GPRP", gprp_pytype);
2416   INSERT("gcprps", gcprps());
2417 }
2418
2419 /*----- That's all, folks -------------------------------------------------*/