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 PyObject *keysz_pywrap(const octet *k)
  39 {
  40   switch (k[0]) {
  41     case KSZ_ANY: {
  42       keysz_pyobj *o = PyObject_New(keysz_pyobj, keyszany_pytype);
  43       o->dfl = k[1];
  44       return ((PyObject *)o);
  45     } break;
  46     case KSZ_RANGE: {
  47       keyszrange_pyobj *o =
  48         PyObject_New(keyszrange_pyobj, keyszrange_pytype);
  49       o->dfl = k[1];
  50       o->min = k[2];
  51       o->max = k[3];
  52       o->mod = k[4];
  53       if (!o->mod) o->mod = 1;
  54       return ((PyObject *)o);
  55     } break;
  56     case KSZ_SET: {
  57       keyszset_pyobj *o =
  58         PyObject_New(keyszset_pyobj, keyszset_pytype);
  59       int i, n;
  60       o->dfl = k[1];
  61       for (i = 0; k[i + 1]; i++) ;
  62       n = i; o->set = PyTuple_New(n);
  63       for (i = 0; i < n; i++)
  64         PyTuple_SET_ITEM(o->set, i, PyInt_FromLong(k[i + 1]));
  65       return ((PyObject *)o);
  66     } break;
  67     default:
  68       abort();
  69   }
  70 }
  71
  72 static PyObject *keyszany_pynew(PyTypeObject *ty,
  73                                 PyObject *arg, PyObject *kw)
  74 {
  75   char *kwlist[] = { "default", 0 };
  76   int dfl;
  77   keysz_pyobj *o;
  78
  79   if (!PyArg_ParseTupleAndKeywords(arg, kw, "i:new", kwlist, &dfl))
  80     goto end;
  81   if (dfl < 0) VALERR("key size cannot be negative");
  82   o = (keysz_pyobj *)ty->tp_alloc(ty, 0);
  83   o->dfl = dfl;
  84   return ((PyObject *)o);
  85 end:
  86   return (0);
  87 }
  88
  89 static PyObject *keyszrange_pynew(PyTypeObject *ty,
  90                                   PyObject *arg, PyObject *kw)
  91 {
  92   char *kwlist[] = { "default", "min", "max", "mod", 0 };
  93   int dfl, min = 0, max = 0, mod = 1;
  94   keyszrange_pyobj *o;
  95
  96   if (!PyArg_ParseTupleAndKeywords(arg, kw, "i|iii:new", kwlist,
  97                                    &dfl, &min, &max, &mod))
  98     goto end;
  99   if (dfl < 0 || min < 0 || max < 0)
 100     VALERR("key size cannot be negative");
 101   if (min > dfl || (max && dfl > max))
 102     VALERR("bad key size bounds");
 103   if (mod <= 0 || dfl % mod || min % mod || max % mod)
 104     VALERR("bad key size modulus");
 105   o = (keyszrange_pyobj *)ty->tp_alloc(ty, 0);
 106   o->dfl = dfl;
 107   o->min = min;
 108   o->max = max;
 109   o->mod = mod;
 110   return ((PyObject *)o);
 111 end:
 112   return (0);
 113 }
 114
 115 static PyObject *keyszset_pynew(PyTypeObject *ty,
 116                                 PyObject *arg, PyObject *kw)
 117 {
 118   char *kwlist[] = { "default", "set", 0 };
 119   int dfl, i, n, xx;
 120   PyObject *set = 0;
 121   PyObject *x = 0, *l = 0;
 122   keyszset_pyobj *o = 0;
 123
 124   if (!PyArg_ParseTupleAndKeywords(arg, kw, "i|O:new", kwlist,
 125                                           &dfl, &set))
 126     goto end;
 127   if (!set) set = PyTuple_New(0);
 128   else Py_INCREF(set);
 129   if (!PySequence_Check(set)) TYERR("want a sequence");
 130   n = PySequence_Size(set);
 131   l = PyList_New(0);
 132   if (PyErr_Occurred()) goto end;
 133   if (dfl < 0) VALERR("key size cannot be negative");
 134   x = PyInt_FromLong(dfl);
 135   PyList_Append(l, x);
 136   Py_DECREF(x);
 137   x = 0;
 138   for (i = 0; i < n; i++) {
 139     if ((x = PySequence_GetItem(set, i)) == 0) goto end;
 140     xx = PyInt_AsLong(x);
 141     if (PyErr_Occurred()) goto end;
 142     if (xx == dfl) continue;
 143     if (xx < 0) VALERR("key size cannot be negative");
 144     PyList_Append(l, x);
 145     Py_DECREF(x);
 146     x = 0;
 147   }
 148   Py_DECREF(set);
 149   if ((set = PySequence_Tuple(l)) == 0) goto end;
 150   o = (keyszset_pyobj *)ty->tp_alloc(ty, 0);
 151   o->dfl = dfl;
 152   o->set = set;
 153   Py_INCREF(set);
 154 end:
 155   Py_XDECREF(set);
 156   Py_XDECREF(l);
 157   Py_XDECREF(x);
 158   return ((PyObject *)o);
 159 }
 160
 161 static PyObject *kaget_min(PyObject *me, void *hunoz)
 162   { return (PyInt_FromLong(0)); }
 163 #define kaget_max kaget_min
 164
 165 static PyObject *ksget_min(PyObject *me, void *hunoz)
 166 {
 167   PyObject *set = ((keyszset_pyobj *)me)->set;
 168   int i, n, y, x = -1;
 169   n = PyTuple_Size(set);
 170   for (i = 0; i < n; i++) {
 171     y = PyInt_AsLong(PyTuple_GetItem(set, i));
 172     if (x == -1 || y < x) x = y;
 173   }
 174   return (PyInt_FromLong(x));
 175 }
 176
 177 static PyObject *ksget_max(PyObject *me, void *hunoz)
 178 {
 179   PyObject *set = ((keyszset_pyobj *)me)->set;
 180   int i, n, y, x = -1;
 181   n = PyTuple_Size(set);
 182   for (i = 0; i < n; i++) {
 183     y = PyInt_AsLong(PyTuple_GetItem(set, i));
 184     if (y > x) x = y;
 185   }
 186   return (PyInt_FromLong(x));
 187 }
 188
 189 static PyMemberDef keysz_pymembers[] = {
 190 #define MEMBERSTRUCT keysz_pyobj
 191 #define default dfl /* ugh! */
 192   MEMBER(default, T_INT, READONLY, "KSZ.default -> default key size")
 193 #undef default
 194 #undef MEMBERSTRUCT
 195   { 0 }
 196 };
 197
 198 static PyGetSetDef keyszany_pygetset[] = {
 199 #define GETSETNAME(op, name) ka##op##_##name
 200   GET   (min,                   "KSZ.min -> smallest allowed key size")
 201   GET   (max,                   "KSZ.min -> largest allowed key size")
 202 #undef GETSETNAME
 203   { 0 }
 204 };
 205
 206 static PyMemberDef keyszrange_pymembers[] = {
 207 #define MEMBERSTRUCT keyszrange_pyobj
 208   MEMBER(min, T_INT, READONLY,  "KSZ.min -> smallest allowed key size")
 209   MEMBER(max, T_INT, READONLY,  "KSZ.min -> largest allowed key size")
 210   MEMBER(mod, T_INT, READONLY,
 211          "KSZ.mod -> key size must be a multiple of this")
 212 #undef MEMBERSTRUCT
 213   { 0 }
 214 };
 215
 216 static PyGetSetDef keyszset_pygetset[] = {
 217 #define GETSETNAME(op, name) ks##op##_##name
 218   GET   (min,                   "KSZ.min -> smallest allowed key size")
 219   GET   (max,                   "KSZ.min -> largest allowed key size")
 220 #undef GETSETNAME
 221   { 0 }
 222 };
 223
 224 static PyMemberDef keyszset_pymembers[] = {
 225 #define MEMBERSTRUCT keyszset_pyobj
 226   MEMBER(set, T_OBJECT, READONLY,       "KSZ.set -> allowed key sizes")
 227 #undef MEMBERSTRUCT
 228   { 0 }
 229 };
 230
 231 static PyTypeObject keysz_pytype_skel = {
 232   PyObject_HEAD_INIT(0) 0,              /* Header */
 233   "KeySZ",                              /* @tp_name@ */
 234   sizeof(keysz_pyobj),                  /* @tp_basicsize@ */
 235   0,                                    /* @tp_itemsize@ */
 236
 237   0,                                    /* @tp_dealloc@ */
 238   0,                                    /* @tp_print@ */
 239   0,                                    /* @tp_getattr@ */
 240   0,                                    /* @tp_setattr@ */
 241   0,                                    /* @tp_compare@ */
 242   0,                                    /* @tp_repr@ */
 243   0,                                    /* @tp_as_number@ */
 244   0,                                    /* @tp_as_sequence@ */
 245   0,                                    /* @tp_as_mapping@ */
 246   0,                                    /* @tp_hash@ */
 247   0,                                    /* @tp_call@ */
 248   0,                                    /* @tp_str@ */
 249   0,                                    /* @tp_getattro@ */
 250   0,                                    /* @tp_setattro@ */
 251   0,                                    /* @tp_as_buffer@ */
 252   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 253     Py_TPFLAGS_BASETYPE,
 254
 255   /* @tp_doc@ */
 256 "Key size constraints.",
 257
 258   0,                                    /* @tp_traverse@ */
 259   0,                                    /* @tp_clear@ */
 260   0,                                    /* @tp_richcompare@ */
 261   0,                                    /* @tp_weaklistoffset@ */
 262   0,                                    /* @tp_iter@ */
 263   0,                                    /* @tp_iternext@ */
 264   0,                                    /* @tp_methods@ */
 265   keysz_pymembers,                      /* @tp_members@ */
 266   0,                                    /* @tp_getset@ */
 267   0,                                    /* @tp_base@ */
 268   0,                                    /* @tp_dict@ */
 269   0,                                    /* @tp_descr_get@ */
 270   0,                                    /* @tp_descr_set@ */
 271   0,                                    /* @tp_dictoffset@ */
 272   0,                                    /* @tp_init@ */
 273   PyType_GenericAlloc,                  /* @tp_alloc@ */
 274   abstract_pynew,                       /* @tp_new@ */
 275   0,                                    /* @tp_free@ */
 276   0                                     /* @tp_is_gc@ */
 277 };
 278
 279 static PyTypeObject keyszany_pytype_skel = {
 280   PyObject_HEAD_INIT(0) 0,              /* Header */
 281   "KeySZAny",                           /* @tp_name@ */
 282   sizeof(keysz_pyobj),                  /* @tp_basicsize@ */
 283   0,                                    /* @tp_itemsize@ */
 284
 285   0,                                    /* @tp_dealloc@ */
 286   0,                                    /* @tp_print@ */
 287   0,                                    /* @tp_getattr@ */
 288   0,                                    /* @tp_setattr@ */
 289   0,                                    /* @tp_compare@ */
 290   0,                                    /* @tp_repr@ */
 291   0,                                    /* @tp_as_number@ */
 292   0,                                    /* @tp_as_sequence@ */
 293   0,                                    /* @tp_as_mapping@ */
 294   0,                                    /* @tp_hash@ */
 295   0,                                    /* @tp_call@ */
 296   0,                                    /* @tp_str@ */
 297   0,                                    /* @tp_getattro@ */
 298   0,                                    /* @tp_setattro@ */
 299   0,                                    /* @tp_as_buffer@ */
 300   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 301     Py_TPFLAGS_BASETYPE,
 302
 303   /* @tp_doc@ */
 304 "Key size constraints.  This object imposes no constraints on size.",
 305
 306   0,                                    /* @tp_traverse@ */
 307   0,                                    /* @tp_clear@ */
 308   0,                                    /* @tp_richcompare@ */
 309   0,                                    /* @tp_weaklistoffset@ */
 310   0,                                    /* @tp_iter@ */
 311   0,                                    /* @tp_iternext@ */
 312   0,                                    /* @tp_methods@ */
 313   0,                                    /* @tp_members@ */
 314   keyszany_pygetset,                    /* @tp_getset@ */
 315   0,                                    /* @tp_base@ */
 316   0,                                    /* @tp_dict@ */
 317   0,                                    /* @tp_descr_get@ */
 318   0,                                    /* @tp_descr_set@ */
 319   0,                                    /* @tp_dictoffset@ */
 320   0,                                    /* @tp_init@ */
 321   PyType_GenericAlloc,                  /* @tp_alloc@ */
 322   keyszany_pynew,                       /* @tp_new@ */
 323   0,                                    /* @tp_free@ */
 324   0                                     /* @tp_is_gc@ */
 325 };
 326
 327 static PyTypeObject keyszrange_pytype_skel = {
 328   PyObject_HEAD_INIT(0) 0,              /* Header */
 329   "KeySZRange",                         /* @tp_name@ */
 330   sizeof(keyszrange_pyobj),             /* @tp_basicsize@ */
 331   0,                                    /* @tp_itemsize@ */
 332
 333   0,                                    /* @tp_dealloc@ */
 334   0,                                    /* @tp_print@ */
 335   0,                                    /* @tp_getattr@ */
 336   0,                                    /* @tp_setattr@ */
 337   0,                                    /* @tp_compare@ */
 338   0,                                    /* @tp_repr@ */
 339   0,                                    /* @tp_as_number@ */
 340   0,                                    /* @tp_as_sequence@ */
 341   0,                                    /* @tp_as_mapping@ */
 342   0,                                    /* @tp_hash@ */
 343   0,                                    /* @tp_call@ */
 344   0,                                    /* @tp_str@ */
 345   0,                                    /* @tp_getattro@ */
 346   0,                                    /* @tp_setattro@ */
 347   0,                                    /* @tp_as_buffer@ */
 348   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 349     Py_TPFLAGS_BASETYPE,
 350
 351   /* @tp_doc@ */
 352 "Key size constraints.  This object asserts minimum and maximum (if\n\
 353 sizes, and requires the key length to be a multiple of some value.",
 354
 355   0,                                    /* @tp_traverse@ */
 356   0,                                    /* @tp_clear@ */
 357   0,                                    /* @tp_richcompare@ */
 358   0,                                    /* @tp_weaklistoffset@ */
 359   0,                                    /* @tp_iter@ */
 360   0,                                    /* @tp_iternext@ */
 361   0,                                    /* @tp_methods@ */
 362   keyszrange_pymembers,                 /* @tp_members@ */
 363   0,                                    /* @tp_getset@ */
 364   0,                                    /* @tp_base@ */
 365   0,                                    /* @tp_dict@ */
 366   0,                                    /* @tp_descr_get@ */
 367   0,                                    /* @tp_descr_set@ */
 368   0,                                    /* @tp_dictoffset@ */
 369   0,                                    /* @tp_init@ */
 370   PyType_GenericAlloc,                  /* @tp_alloc@ */
 371   keyszrange_pynew,                     /* @tp_new@ */
 372   0,                                    /* @tp_free@ */
 373   0                                     /* @tp_is_gc@ */
 374 };
 375
 376 static PyTypeObject keyszset_pytype_skel = {
 377   PyObject_HEAD_INIT(0) 0,              /* Header */
 378   "KeySZSet",                           /* @tp_name@ */
 379   sizeof(keyszset_pyobj),               /* @tp_basicsize@ */
 380   0,                                    /* @tp_itemsize@ */
 381
 382   0,                                    /* @tp_dealloc@ */
 383   0,                                    /* @tp_print@ */
 384   0,                                    /* @tp_getattr@ */
 385   0,                                    /* @tp_setattr@ */
 386   0,                                    /* @tp_compare@ */
 387   0,                                    /* @tp_repr@ */
 388   0,                                    /* @tp_as_number@ */
 389   0,                                    /* @tp_as_sequence@ */
 390   0,                                    /* @tp_as_mapping@ */
 391   0,                                    /* @tp_hash@ */
 392   0,                                    /* @tp_call@ */
 393   0,                                    /* @tp_str@ */
 394   0,                                    /* @tp_getattro@ */
 395   0,                                    /* @tp_setattro@ */
 396   0,                                    /* @tp_as_buffer@ */
 397   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 398     Py_TPFLAGS_BASETYPE,
 399
 400   /* @tp_doc@ */
 401 "Key size constraints.  This object requires the key to be one of a\n\
 402 few listed sizes.",
 403
 404   0,                                    /* @tp_traverse@ */
 405   0,                                    /* @tp_clear@ */
 406   0,                                    /* @tp_richcompare@ */
 407   0,                                    /* @tp_weaklistoffset@ */
 408   0,                                    /* @tp_iter@ */
 409   0,                                    /* @tp_iternext@ */
 410   0,                                    /* @tp_methods@ */
 411   keyszset_pymembers,                   /* @tp_members@ */
 412   keyszset_pygetset,                    /* @tp_getset@ */
 413   0,                                    /* @tp_base@ */
 414   0,                                    /* @tp_dict@ */
 415   0,                                    /* @tp_descr_get@ */
 416   0,                                    /* @tp_descr_set@ */
 417   0,                                    /* @tp_dictoffset@ */
 418   0,                                    /* @tp_init@ */
 419   PyType_GenericAlloc,                  /* @tp_alloc@ */
 420   keyszset_pynew,                       /* @tp_new@ */
 421   0,                                    /* @tp_free@ */
 422   0                                     /* @tp_is_gc@ */
 423 };
 424
 425 #define KSZCONVOP(op)                                                   \
 426   static PyObject *meth__KeySZ_##op(PyObject *me, PyObject *arg)        \
 427   {                                                                     \
 428     double x, y;                                                        \
 429     if (!PyArg_ParseTuple(arg, "Od:" #op, &me, &x)) return (0);         \
 430     y = keysz_##op(x);                                                  \
 431     return (PyFloat_FromDouble(y));                                     \
 432   }
 433 KSZCONVOP(fromdl)
 434 KSZCONVOP(fromschnorr)
 435 KSZCONVOP(fromif)
 436 KSZCONVOP(fromec)
 437 KSZCONVOP(todl)
 438 KSZCONVOP(toschnorr)
 439 KSZCONVOP(toif)
 440 KSZCONVOP(toec)
 441 #undef KSZCONVOP
 442
 443 /*----- Symmetric encryption ----------------------------------------------*/
 444
 445 PyTypeObject *gccipher_pytype, *gcipher_pytype;
 446
 447 CONVFUNC(gccipher, gccipher *, GCCIPHER_CC)
 448 CONVFUNC(gcipher, gcipher *, GCIPHER_C)
 449
 450 PyObject *gcipher_pywrap(PyObject *cobj, gcipher *c, unsigned f)
 451 {
 452   gcipher_pyobj *g;
 453   if (!cobj) cobj = gccipher_pywrap((/*unconst*/ gccipher *)GC_CLASS(c));
 454   else Py_INCREF(cobj);
 455   g = PyObject_NEW(gcipher_pyobj, (PyTypeObject *)cobj);
 456   g->c = c;
 457   g->f = f;
 458   return ((PyObject *)g);
 459 }
 460
 461 static PyObject *gcipher_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
 462 {
 463   char *kwlist[] = { "k", 0 };
 464   char *k;
 465   int sz;
 466
 467   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", kwlist, &k, &sz))
 468     goto end;
 469   if (keysz(sz, GCCIPHER_CC(ty)->keysz) != sz) VALERR("bad key length");
 470   return (gcipher_pywrap((PyObject *)ty,
 471                          GC_INIT(GCCIPHER_CC(ty), k, sz),
 472                          f_freeme));
 473 end:
 474   return (0);
 475 }
 476
 477 PyObject *gccipher_pywrap(gccipher *cc)
 478 {
 479   gccipher_pyobj *g = newtype(gccipher_pytype, 0, cc->name);
 480   g->cc = cc;
 481   g->ty.ht_type.tp_basicsize = sizeof(gcipher_pyobj);
 482   g->ty.ht_type.tp_base = gcipher_pytype;
 483   Py_INCREF(gcipher_pytype);
 484   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
 485                             Py_TPFLAGS_BASETYPE |
 486                             Py_TPFLAGS_HEAPTYPE);
 487   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
 488   g->ty.ht_type.tp_free = 0;
 489   g->ty.ht_type.tp_new = gcipher_pynew;
 490   typeready(&g->ty.ht_type);
 491   return ((PyObject *)g);
 492 }
 493
 494 static void gcipher_pydealloc(PyObject *me)
 495 {
 496   if (GCIPHER_F(me) & f_freeme)
 497     GC_DESTROY(GCIPHER_C(me));
 498   Py_DECREF(me->ob_type);
 499   FREEOBJ(me);
 500 }
 501
 502 static PyObject *gccget_name(PyObject *me, void *hunoz)
 503   { return (PyString_FromString(GCCIPHER_CC(me)->name)); }
 504
 505 static PyObject *gccget_keysz(PyObject *me, void *hunoz)
 506   { return (keysz_pywrap(GCCIPHER_CC(me)->keysz)); }
 507
 508 static PyObject *gccget_blksz(PyObject *me, void *hunoz)
 509   { return (PyInt_FromLong(GCCIPHER_CC(me)->blksz)); }
 510
 511 static PyObject *gcmeth_encrypt(PyObject *me, PyObject *arg)
 512 {
 513   char *p;
 514   int sz;
 515   PyObject *rc = 0;
 516
 517   if (!PyArg_ParseTuple(arg, "s#:encrypt", &p, &sz)) return (0);
 518   rc = bytestring_pywrap(0, sz);
 519   GC_ENCRYPT(GCIPHER_C(me), p, PyString_AS_STRING(rc), sz);
 520   return (rc);
 521 }
 522
 523 static PyObject *gcmeth_enczero(PyObject *me, PyObject *arg)
 524 {
 525   char *p;
 526   int sz;
 527   PyObject *rc = 0;
 528
 529   if (!PyArg_ParseTuple(arg, "i:enczero", &sz)) return (0);
 530   rc = bytestring_pywrap(0, sz);
 531   p = PyString_AS_STRING(rc);
 532   memset(p, 0, sz);
 533   GC_ENCRYPT(GCIPHER_C(me), p, p, sz);
 534   return (rc);
 535 }
 536
 537 static PyObject *gcmeth_decrypt(PyObject *me, PyObject *arg)
 538 {
 539   char *p;
 540   int sz;
 541   PyObject *rc = 0;
 542
 543   if (!PyArg_ParseTuple(arg, "s#:decrypt", &p, &sz)) return (0);
 544   rc = bytestring_pywrap(0, sz);
 545   GC_DECRYPT(GCIPHER_C(me), p, PyString_AS_STRING(rc), sz);
 546   return (rc);
 547 }
 548
 549 static PyObject *gcmeth_deczero(PyObject *me, PyObject *arg)
 550 {
 551   char *p;
 552   int sz;
 553   PyObject *rc = 0;
 554
 555   if (!PyArg_ParseTuple(arg, "i:deczero", &sz)) return (0);
 556   rc = bytestring_pywrap(0, sz);
 557   p = PyString_AS_STRING(rc);
 558   memset(p, 0, sz);
 559   GC_DECRYPT(GCIPHER_C(me), p, p, sz);
 560   return (rc);
 561 }
 562
 563 static PyObject *gcmeth_setiv(PyObject *me, PyObject *arg)
 564 {
 565   char *p;
 566   int sz;
 567
 568   if (!PyArg_ParseTuple(arg, "s#:setiv", &p, &sz)) goto end;
 569   if (!GC_CLASS(GCIPHER_C(me))->blksz) VALERR("not a block cipher mode");
 570   if (sz != GC_CLASS(GCIPHER_C(me))->blksz) VALERR("bad IV length");
 571   GC_SETIV(GCIPHER_C(me), p);
 572   RETURN_ME;
 573 end:
 574   return (0);
 575 }
 576
 577 static PyObject *gcmeth_bdry(PyObject *me, PyObject *arg)
 578 {
 579   if (!PyArg_ParseTuple(arg, ":bdry")) goto end;
 580   if (!GC_CLASS(GCIPHER_C(me))->blksz) VALERR("not a block cipher mode");
 581   GC_BDRY(GCIPHER_C(me));
 582   RETURN_ME;
 583 end:
 584   return (0);
 585 }
 586
 587 static PyGetSetDef gccipher_pygetset[] = {
 588 #define GETSETNAME(op, name) gcc##op##_##name
 589   GET   (keysz,                 "CC.keysz -> acceptable key sizes")
 590   GET   (blksz,                 "CC.blksz -> block size, or zero")
 591   GET   (name,                  "CC.name -> name of this kind of cipher")
 592 #undef GETSETNAME
 593   { 0 }
 594 };
 595
 596 static PyMethodDef gcipher_pymethods[] = {
 597 #define METHNAME(name) gcmeth_##name
 598   METH  (encrypt,               "C.encrypt(PT) -> CT")
 599   METH  (enczero,               "C.enczero(N) -> CT")
 600   METH  (decrypt,               "C.decrypt(CT) -> PT")
 601   METH  (deczero,               "C.deczero(N) -> PT")
 602   METH  (setiv,                 "C.setiv(IV)")
 603   METH  (bdry,                  "C.bdry()")
 604 #undef METHNAME
 605   { 0 }
 606 };
 607
 608 static PyTypeObject gccipher_pytype_skel = {
 609   PyObject_HEAD_INIT(0) 0,              /* Header */
 610   "GCCipher",                           /* @tp_name@ */
 611   sizeof(gccipher_pyobj),               /* @tp_basicsize@ */
 612   0,                                    /* @tp_itemsize@ */
 613
 614   0,                                    /* @tp_dealloc@ */
 615   0,                                    /* @tp_print@ */
 616   0,                                    /* @tp_getattr@ */
 617   0,                                    /* @tp_setattr@ */
 618   0,                                    /* @tp_compare@ */
 619   0,                                    /* @tp_repr@ */
 620   0,                                    /* @tp_as_number@ */
 621   0,                                    /* @tp_as_sequence@ */
 622   0,                                    /* @tp_as_mapping@ */
 623   0,                                    /* @tp_hash@ */
 624   0,                                    /* @tp_call@ */
 625   0,                                    /* @tp_str@ */
 626   0,                                    /* @tp_getattro@ */
 627   0,                                    /* @tp_setattro@ */
 628   0,                                    /* @tp_as_buffer@ */
 629   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 630     Py_TPFLAGS_BASETYPE,
 631
 632   /* @tp_doc@ */
 633 "Symmetric cipher metaclass.",
 634
 635   0,                                    /* @tp_traverse@ */
 636   0,                                    /* @tp_clear@ */
 637   0,                                    /* @tp_richcompare@ */
 638   0,                                    /* @tp_weaklistoffset@ */
 639   0,                                    /* @tp_iter@ */
 640   0,                                    /* @tp_iternext@ */
 641   0,                                    /* @tp_methods@ */
 642   0,                                    /* @tp_members@ */
 643   gccipher_pygetset,                    /* @tp_getset@ */
 644   0,                                    /* @tp_base@ */
 645   0,                                    /* @tp_dict@ */
 646   0,                                    /* @tp_descr_get@ */
 647   0,                                    /* @tp_descr_set@ */
 648   0,                                    /* @tp_dictoffset@ */
 649   0,                                    /* @tp_init@ */
 650   PyType_GenericAlloc,                  /* @tp_alloc@ */
 651   abstract_pynew,                       /* @tp_new@ */
 652   0,                                    /* @tp_free@ */
 653   0                                     /* @tp_is_gc@ */
 654 };
 655
 656 static PyTypeObject gcipher_pytype_skel = {
 657   PyObject_HEAD_INIT(0) 0,              /* Header */
 658   "GCipher",                            /* @tp_name@ */
 659   sizeof(gcipher_pyobj),                /* @tp_basicsize@ */
 660   0,                                    /* @tp_itemsize@ */
 661
 662   gcipher_pydealloc,                    /* @tp_dealloc@ */
 663   0,                                    /* @tp_print@ */
 664   0,                                    /* @tp_getattr@ */
 665   0,                                    /* @tp_setattr@ */
 666   0,                                    /* @tp_compare@ */
 667   0,                                    /* @tp_repr@ */
 668   0,                                    /* @tp_as_number@ */
 669   0,                                    /* @tp_as_sequence@ */
 670   0,                                    /* @tp_as_mapping@ */
 671   0,                                    /* @tp_hash@ */
 672   0,                                    /* @tp_call@ */
 673   0,                                    /* @tp_str@ */
 674   0,                                    /* @tp_getattro@ */
 675   0,                                    /* @tp_setattro@ */
 676   0,                                    /* @tp_as_buffer@ */
 677   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 678     Py_TPFLAGS_BASETYPE,
 679
 680   /* @tp_doc@ */
 681 "Symmetric cipher, abstract base class.",
 682
 683   0,                                    /* @tp_traverse@ */
 684   0,                                    /* @tp_clear@ */
 685   0,                                    /* @tp_richcompare@ */
 686   0,                                    /* @tp_weaklistoffset@ */
 687   0,                                    /* @tp_iter@ */
 688   0,                                    /* @tp_iternext@ */
 689   gcipher_pymethods,                    /* @tp_methods@ */
 690   0,                                    /* @tp_members@ */
 691   0,                                    /* @tp_getset@ */
 692   0,                                    /* @tp_base@ */
 693   0,                                    /* @tp_dict@ */
 694   0,                                    /* @tp_descr_get@ */
 695   0,                                    /* @tp_descr_set@ */
 696   0,                                    /* @tp_dictoffset@ */
 697   0,                                    /* @tp_init@ */
 698   PyType_GenericAlloc,                  /* @tp_alloc@ */
 699   abstract_pynew,                       /* @tp_new@ */
 700   0,                                    /* @tp_free@ */
 701   0                                     /* @tp_is_gc@ */
 702 };
 703
 704 /*----- Hash functions ----------------------------------------------------*/
 705
 706 PyTypeObject *gchash_pytype, *ghash_pytype;
 707
 708 CONVFUNC(gchash, gchash *, GCHASH_CH)
 709 CONVFUNC(ghash, ghash *, GHASH_H)
 710
 711 static PyObject *ghash_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
 712 {
 713   char *kwlist[] = { 0 };
 714   if (!PyArg_ParseTupleAndKeywords(arg, kw, ":new", kwlist))
 715     goto end;
 716   return (ghash_pywrap((PyObject *)ty, GH_INIT(GCHASH_CH(ty)), f_freeme));
 717 end:
 718   return (0);
 719 }
 720
 721 PyObject *gchash_pywrap(gchash *ch)
 722 {
 723   gchash_pyobj *g = newtype(gchash_pytype, 0, ch->name);
 724   g->ch = ch;
 725   g->ty.ht_type.tp_basicsize = sizeof(ghash_pyobj);
 726   g->ty.ht_type.tp_base = ghash_pytype;
 727   Py_INCREF(ghash_pytype);
 728   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
 729                             Py_TPFLAGS_BASETYPE |
 730                             Py_TPFLAGS_HEAPTYPE);
 731   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
 732   g->ty.ht_type.tp_free = 0;
 733   g->ty.ht_type.tp_new = ghash_pynew;
 734   typeready(&g->ty.ht_type);
 735   return ((PyObject *)g);
 736 }
 737
 738 PyObject *ghash_pywrap(PyObject *cobj, ghash *h, unsigned f)
 739 {
 740   ghash_pyobj *g;
 741   if (!cobj) cobj = gchash_pywrap((/*unconst*/ gchash *)GH_CLASS(h));
 742   else Py_INCREF(cobj);
 743   g = PyObject_NEW(ghash_pyobj, (PyTypeObject *)cobj);
 744   g->h = h;
 745   g->f = f;
 746   return ((PyObject *)g);
 747 }
 748
 749 static void ghash_pydealloc(PyObject *me)
 750 {
 751   if (GHASH_F(me) & f_freeme)
 752     GH_DESTROY(GHASH_H(me));
 753   Py_DECREF(me->ob_type);
 754   FREEOBJ(me);
 755 }
 756
 757 static PyObject *gchget_name(PyObject *me, void *hunoz)
 758   { return (PyString_FromString(GCHASH_CH(me)->name)); }
 759
 760 static PyObject *gchget_hashsz(PyObject *me, void *hunoz)
 761   { return (PyInt_FromLong(GCHASH_CH(me)->hashsz)); }
 762
 763 static PyObject *gchget_bufsz(PyObject *me, void *hunoz)
 764   { return (PyInt_FromLong(GCHASH_CH(me)->bufsz)); }
 765
 766 static PyObject *ghmeth_hash(PyObject *me, PyObject *arg)
 767 {
 768   char *p;
 769   int sz;
 770   if (!PyArg_ParseTuple(arg, "s#:hash", &p, &sz)) return (0);
 771   GH_HASH(GHASH_H(me), p, sz);
 772   RETURN_ME;
 773 }
 774
 775 #define GHMETH_HASHU_(n, W, w)                                          \
 776   static PyObject *ghmeth_hashu##w(PyObject *me, PyObject *arg)         \
 777   {                                                                     \
 778     uint##n x;                                                          \
 779     if (!PyArg_ParseTuple(arg, "O&:hashu" #w, convu##n, &x)) goto end;  \
 780     GH_HASHU##W(GHASH_H(me), x);                                        \
 781     RETURN_ME;                                                          \
 782   end:                                                                  \
 783     return (0);                                                         \
 784   }
 785 DOUINTCONV(GHMETH_HASHU_)
 786
 787 #define GHMETH_HASHBUF_(n, W, w)                                        \
 788   static PyObject *ghmeth_hashbuf##w(PyObject *me, PyObject *arg)       \
 789   {                                                                     \
 790     char *p;                                                            \
 791     int sz;                                                             \
 792     if (!PyArg_ParseTuple(arg, "s#:hashbuf" #w, &p, &sz)) goto end;     \
 793     if (sz > MASK##n) TYERR("string too long");                         \
 794     GH_HASHBUF##W(GHASH_H(me), p, sz);                                  \
 795     RETURN_ME;                                                          \
 796   end:                                                                  \
 797     return (0);                                                         \
 798   }
 799 DOUINTCONV(GHMETH_HASHBUF_)
 800
 801 static PyObject *ghmeth_hashstrz(PyObject *me, PyObject *arg)
 802 {
 803   char *p;
 804   if (!PyArg_ParseTuple(arg, "s:hashstrz", &p)) return (0);
 805   GH_HASHSTRZ(GHASH_H(me), p);
 806   RETURN_ME;
 807 }
 808
 809 static PyObject *ghmeth_done(PyObject *me, PyObject *arg)
 810 {
 811   ghash *g;
 812   PyObject *rc;
 813   if (!PyArg_ParseTuple(arg, ":done")) return (0);
 814   g = GH_COPY(GHASH_H(me));
 815   rc = bytestring_pywrap(0, g->ops->c->hashsz);
 816   GH_DONE(g, PyString_AS_STRING(rc));
 817   GH_DESTROY(g);
 818   return (rc);
 819 }
 820
 821 static PyGetSetDef gchash_pygetset[] = {
 822 #define GETSETNAME(op, name) gch##op##_##name
 823   GET   (bufsz,                 "CH.bufsz -> hash buffer size, or zero")
 824   GET   (hashsz,                "CH.hashsz -> hash output size")
 825   GET   (name,                  "CH.name -> name of this kind of hash")
 826 #undef GETSETNAME
 827   { 0 }
 828 };
 829
 830 static PyMethodDef ghash_pymethods[] = {
 831 #define METHNAME(name) ghmeth_##name
 832   METH  (hash,                  "H.hash(M)")
 833 #define METHU_(n, W, w) METH(hashu##w, "H.hashu" #w "(WORD)")
 834   DOUINTCONV(METHU_)
 835 #undef METHU_
 836 #define METHBUF_(n, W, w) METH(hashbuf##w, "H.hashbuf" #w "(BYTES)")
 837   DOUINTCONV(METHBUF_)
 838 #undef METHBUF_
 839   METH  (hashstrz,              "H.hashstrz(STRING)")
 840   METH  (done,                  "H.done() -> HASH")
 841 #undef METHNAME
 842   { 0 }
 843 };
 844
 845 static PyTypeObject gchash_pytype_skel = {
 846   PyObject_HEAD_INIT(0) 0,              /* Header */
 847   "GCHash",                             /* @tp_name@ */
 848   sizeof(gchash_pyobj),                 /* @tp_basicsize@ */
 849   0,                                    /* @tp_itemsize@ */
 850
 851   0,                                    /* @tp_dealloc@ */
 852   0,                                    /* @tp_print@ */
 853   0,                                    /* @tp_getattr@ */
 854   0,                                    /* @tp_setattr@ */
 855   0,                                    /* @tp_compare@ */
 856   0,                                    /* @tp_repr@ */
 857   0,                                    /* @tp_as_number@ */
 858   0,                                    /* @tp_as_sequence@ */
 859   0,                                    /* @tp_as_mapping@ */
 860   0,                                    /* @tp_hash@ */
 861   0,                                    /* @tp_call@ */
 862   0,                                    /* @tp_str@ */
 863   0,                                    /* @tp_getattro@ */
 864   0,                                    /* @tp_setattro@ */
 865   0,                                    /* @tp_as_buffer@ */
 866   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 867     Py_TPFLAGS_BASETYPE,
 868
 869   /* @tp_doc@ */
 870 "Hash function metaclass.",
 871
 872   0,                                    /* @tp_traverse@ */
 873   0,                                    /* @tp_clear@ */
 874   0,                                    /* @tp_richcompare@ */
 875   0,                                    /* @tp_weaklistoffset@ */
 876   0,                                    /* @tp_iter@ */
 877   0,                                    /* @tp_iternext@ */
 878   0,                                    /* @tp_methods@ */
 879   0,                                    /* @tp_members@ */
 880   gchash_pygetset,                      /* @tp_getset@ */
 881   0,                                    /* @tp_base@ */
 882   0,                                    /* @tp_dict@ */
 883   0,                                    /* @tp_descr_get@ */
 884   0,                                    /* @tp_descr_set@ */
 885   0,                                    /* @tp_dictoffset@ */
 886   0,                                    /* @tp_init@ */
 887   PyType_GenericAlloc,                  /* @tp_alloc@ */
 888   abstract_pynew,                       /* @tp_new@ */
 889   0,                                    /* @tp_free@ */
 890   0                                     /* @tp_is_gc@ */
 891 };
 892
 893 static PyTypeObject ghash_pytype_skel = {
 894   PyObject_HEAD_INIT(0) 0,              /* Header */
 895   "GHash",                              /* @tp_name@ */
 896   sizeof(ghash_pyobj),                  /* @tp_basicsize@ */
 897   0,                                    /* @tp_itemsize@ */
 898
 899   ghash_pydealloc,                      /* @tp_dealloc@ */
 900   0,                                    /* @tp_print@ */
 901   0,                                    /* @tp_getattr@ */
 902   0,                                    /* @tp_setattr@ */
 903   0,                                    /* @tp_compare@ */
 904   0,                                    /* @tp_repr@ */
 905   0,                                    /* @tp_as_number@ */
 906   0,                                    /* @tp_as_sequence@ */
 907   0,                                    /* @tp_as_mapping@ */
 908   0,                                    /* @tp_hash@ */
 909   0,                                    /* @tp_call@ */
 910   0,                                    /* @tp_str@ */
 911   0,                                    /* @tp_getattro@ */
 912   0,                                    /* @tp_setattro@ */
 913   0,                                    /* @tp_as_buffer@ */
 914   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 915     Py_TPFLAGS_BASETYPE,
 916
 917   /* @tp_doc@ */
 918 "Hash function, abstract base class.",
 919
 920   0,                                    /* @tp_traverse@ */
 921   0,                                    /* @tp_clear@ */
 922   0,                                    /* @tp_richcompare@ */
 923   0,                                    /* @tp_weaklistoffset@ */
 924   0,                                    /* @tp_iter@ */
 925   0,                                    /* @tp_iternext@ */
 926   ghash_pymethods,                      /* @tp_methods@ */
 927   0,                                    /* @tp_members@ */
 928   0,                                    /* @tp_getset@ */
 929   0,                                    /* @tp_base@ */
 930   0,                                    /* @tp_dict@ */
 931   0,                                    /* @tp_descr_get@ */
 932   0,                                    /* @tp_descr_set@ */
 933   0,                                    /* @tp_dictoffset@ */
 934   0,                                    /* @tp_init@ */
 935   PyType_GenericAlloc,                  /* @tp_alloc@ */
 936   abstract_pynew,                       /* @tp_new@ */
 937   0,                                    /* @tp_free@ */
 938   0                                     /* @tp_is_gc@ */
 939 };
 940
 941 /*----- Message authentication --------------------------------------------*/
 942
 943 PyTypeObject *gcmac_pytype, *gmac_pytype, *gmhash_pytype;
 944
 945 CONVFUNC(gcmac, gcmac *, GCMAC_CM)
 946 CONVFUNC(gmac, gmac *, GMAC_M)
 947 CONVFUNC(gmhash, ghash *, GHASH_H)
 948
 949 static PyObject *gmac_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
 950 {
 951   char *kwlist[] = { "k", 0 };
 952   char *k;
 953   int sz;
 954
 955   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", kwlist, &k, &sz))
 956     goto end;
 957   if (keysz(sz, GCMAC_CM(ty)->keysz) != sz) VALERR("bad key length");
 958   return (gmac_pywrap((PyObject *)ty,
 959                       GM_KEY(GCMAC_CM(ty), k, sz),
 960                       f_freeme));
 961 end:
 962   return (0);
 963 }
 964
 965 static PyObject *gmhash_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
 966 {
 967   char *kwlist[] = { 0 };
 968   ghash_pyobj *g;
 969
 970   if (!PyArg_ParseTupleAndKeywords(arg, kw, ":new", kwlist)) return (0);
 971   g = PyObject_NEW(ghash_pyobj, ty);
 972   g->h = GM_INIT(GMAC_M(ty));
 973   g->f = f_freeme;
 974   Py_INCREF(ty);
 975   return ((PyObject *)g);
 976 }
 977
 978 PyObject *gcmac_pywrap(gcmac *cm)
 979 {
 980   gcmac_pyobj *g = newtype(gcmac_pytype, 0, cm->name);
 981   g->cm = cm;
 982   g->ty.ht_type.tp_basicsize = sizeof(gmac_pyobj);
 983   g->ty.ht_type.tp_base = gmac_pytype;
 984   Py_INCREF(gmac_pytype);
 985   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
 986                             Py_TPFLAGS_BASETYPE |
 987                             Py_TPFLAGS_HEAPTYPE);
 988   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
 989   g->ty.ht_type.tp_free = 0;
 990   g->ty.ht_type.tp_new = gmac_pynew;
 991   typeready(&g->ty.ht_type);
 992   return ((PyObject *)g);
 993 }
 994
 995 PyObject *gmac_pywrap(PyObject *cobj, gmac *m, unsigned f)
 996 {
 997   gmac_pyobj *g;
 998   if (!cobj) cobj = gcmac_pywrap((/*unconst*/ gcmac *)GM_CLASS(m));
 999   else Py_INCREF(cobj);
1000   g = newtype((PyTypeObject *)cobj, 0, 0);
1001   g->ty.ht_type.tp_basicsize = sizeof(ghash_pyobj);
1002   g->ty.ht_name = PyString_FromFormat("%s(keyed)", m->ops->c->name);
1003   g->ty.ht_type.tp_name = PyString_AS_STRING(g->ty.ht_name);
1004   g->ty.ht_type.tp_base = gmhash_pytype;
1005   Py_INCREF(gmac_pytype);
1006   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
1007                             Py_TPFLAGS_BASETYPE |
1008                             Py_TPFLAGS_HEAPTYPE);
1009   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
1010   g->ty.ht_type.tp_free = 0;
1011   g->ty.ht_type.tp_new = gmhash_pynew;
1012   typeready(&g->ty.ht_type);
1013   g->m = m;
1014   g->f = f;
1015   return ((PyObject *)g);
1016 }
1017
1018 static void gmac_pydealloc(PyObject *me)
1019 {
1020   if (GMAC_F(me) & f_freeme)
1021     GM_DESTROY(GMAC_M(me));
1022   Py_DECREF(me->ob_type);
1023   PyType_Type.tp_dealloc(me);
1024 }
1025
1026 static PyObject *gcmget_name(PyObject *me, void *hunoz)
1027   { return (PyString_FromString(GCMAC_CM(me)->name)); }
1028
1029 static PyObject *gcmget_keysz(PyObject *me, void *hunoz)
1030   { return (keysz_pywrap(GCMAC_CM(me)->keysz)); }
1031
1032 static PyObject *gcmget_tagsz(PyObject *me, void *hunoz)
1033   { return (PyInt_FromLong(GCMAC_CM(me)->hashsz)); }
1034
1035 static PyGetSetDef gcmac_pygetset[] = {
1036 #define GETSETNAME(op, name) gcm##op##_##name
1037   GET   (keysz,                 "CM.keysz -> acceptable key sizes")
1038   GET   (tagsz,                 "CM.tagsz -> MAC output size")
1039   GET   (name,                  "CM.name -> name of this kind of MAC")
1040 #undef GETSETNAME
1041   { 0 }
1042 };
1043
1044 static PyTypeObject gcmac_pytype_skel = {
1045   PyObject_HEAD_INIT(0) 0,              /* Header */
1046   "GCMAC",                              /* @tp_name@ */
1047   sizeof(gchash_pyobj),                 /* @tp_basicsize@ */
1048   0,                                    /* @tp_itemsize@ */
1049
1050   0,                                    /* @tp_dealloc@ */
1051   0,                                    /* @tp_print@ */
1052   0,                                    /* @tp_getattr@ */
1053   0,                                    /* @tp_setattr@ */
1054   0,                                    /* @tp_compare@ */
1055   0,                                    /* @tp_repr@ */
1056   0,                                    /* @tp_as_number@ */
1057   0,                                    /* @tp_as_sequence@ */
1058   0,                                    /* @tp_as_mapping@ */
1059   0,                                    /* @tp_hash@ */
1060   0,                                    /* @tp_call@ */
1061   0,                                    /* @tp_str@ */
1062   0,                                    /* @tp_getattro@ */
1063   0,                                    /* @tp_setattro@ */
1064   0,                                    /* @tp_as_buffer@ */
1065   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1066     Py_TPFLAGS_BASETYPE,
1067
1068   /* @tp_doc@ */
1069 "Message authentication code metametaclass.",
1070
1071   0,                                    /* @tp_traverse@ */
1072   0,                                    /* @tp_clear@ */
1073   0,                                    /* @tp_richcompare@ */
1074   0,                                    /* @tp_weaklistoffset@ */
1075   0,                                    /* @tp_iter@ */
1076   0,                                    /* @tp_iternext@ */
1077   0,                                    /* @tp_methods@ */
1078   0,                                    /* @tp_members@ */
1079   gcmac_pygetset,                       /* @tp_getset@ */
1080   0,                                    /* @tp_base@ */
1081   0,                                    /* @tp_dict@ */
1082   0,                                    /* @tp_descr_get@ */
1083   0,                                    /* @tp_descr_set@ */
1084   0,                                    /* @tp_dictoffset@ */
1085   0,                                    /* @tp_init@ */
1086   PyType_GenericAlloc,                  /* @tp_alloc@ */
1087   abstract_pynew,                       /* @tp_new@ */
1088   0,                                    /* @tp_free@ */
1089   0                                     /* @tp_is_gc@ */
1090 };
1091
1092 static PyTypeObject gmac_pytype_skel = {
1093   PyObject_HEAD_INIT(0) 0,              /* Header */
1094   "GMAC",                               /* @tp_name@ */
1095   sizeof(gmac_pyobj),                   /* @tp_basicsize@ */
1096   0,                                    /* @tp_itemsize@ */
1097
1098   gmac_pydealloc,                       /* @tp_dealloc@ */
1099   0,                                    /* @tp_print@ */
1100   0,                                    /* @tp_getattr@ */
1101   0,                                    /* @tp_setattr@ */
1102   0,                                    /* @tp_compare@ */
1103   0,                                    /* @tp_repr@ */
1104   0,                                    /* @tp_as_number@ */
1105   0,                                    /* @tp_as_sequence@ */
1106   0,                                    /* @tp_as_mapping@ */
1107   0,                                    /* @tp_hash@ */
1108   0,                                    /* @tp_call@ */
1109   0,                                    /* @tp_str@ */
1110   0,                                    /* @tp_getattro@ */
1111   0,                                    /* @tp_setattro@ */
1112   0,                                    /* @tp_as_buffer@ */
1113   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1114     Py_TPFLAGS_BASETYPE,
1115
1116   /* @tp_doc@ */
1117 "Message authentication code metaclass, abstract base class.",
1118
1119   0,                                    /* @tp_traverse@ */
1120   0,                                    /* @tp_clear@ */
1121   0,                                    /* @tp_richcompare@ */
1122   0,                                    /* @tp_weaklistoffset@ */
1123   0,                                    /* @tp_iter@ */
1124   0,                                    /* @tp_iternext@ */
1125   0,                                    /* @tp_methods@ */
1126   0,                                    /* @tp_members@ */
1127   0,                                    /* @tp_getset@ */
1128   0,                                    /* @tp_base@ */
1129   0,                                    /* @tp_dict@ */
1130   0,                                    /* @tp_descr_get@ */
1131   0,                                    /* @tp_descr_set@ */
1132   0,                                    /* @tp_dictoffset@ */
1133   0,                                    /* @tp_init@ */
1134   PyType_GenericAlloc,                  /* @tp_alloc@ */
1135   abstract_pynew,                       /* @tp_new@ */
1136   0,                                    /* @tp_free@ */
1137   0                                     /* @tp_is_gc@ */
1138 };
1139
1140 static PyTypeObject gmhash_pytype_skel = {
1141   PyObject_HEAD_INIT(0) 0,              /* Header */
1142   "GMACHash",                           /* @tp_name@ */
1143   sizeof(ghash_pyobj),                  /* @tp_basicsize@ */
1144   0,                                    /* @tp_itemsize@ */
1145
1146   ghash_pydealloc,                      /* @tp_dealloc@ */
1147   0,                                    /* @tp_print@ */
1148   0,                                    /* @tp_getattr@ */
1149   0,                                    /* @tp_setattr@ */
1150   0,                                    /* @tp_compare@ */
1151   0,                                    /* @tp_repr@ */
1152   0,                                    /* @tp_as_number@ */
1153   0,                                    /* @tp_as_sequence@ */
1154   0,                                    /* @tp_as_mapping@ */
1155   0,                                    /* @tp_hash@ */
1156   0,                                    /* @tp_call@ */
1157   0,                                    /* @tp_str@ */
1158   0,                                    /* @tp_getattro@ */
1159   0,                                    /* @tp_setattro@ */
1160   0,                                    /* @tp_as_buffer@ */
1161   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1162     Py_TPFLAGS_BASETYPE,
1163
1164   /* @tp_doc@ */
1165 "Message authentication code, abstract base class.",
1166
1167   0,                                    /* @tp_traverse@ */
1168   0,                                    /* @tp_clear@ */
1169   0,                                    /* @tp_richcompare@ */
1170   0,                                    /* @tp_weaklistoffset@ */
1171   0,                                    /* @tp_iter@ */
1172   0,                                    /* @tp_iternext@ */
1173   0,                                    /* @tp_methods@ */
1174   0,                                    /* @tp_members@ */
1175   0,                                    /* @tp_getset@ */
1176   0,                                    /* @tp_base@ */
1177   0,                                    /* @tp_dict@ */
1178   0,                                    /* @tp_descr_get@ */
1179   0,                                    /* @tp_descr_set@ */
1180   0,                                    /* @tp_dictoffset@ */
1181   0,                                    /* @tp_init@ */
1182   PyType_GenericAlloc,                  /* @tp_alloc@ */
1183   abstract_pynew,                       /* @tp_new@ */
1184   0,                                    /* @tp_free@ */
1185   0                                     /* @tp_is_gc@ */
1186 };
1187
1188 /*----- Special snowflake for Poly1305 ------------------------------------*/
1189
1190 PyTypeObject *poly1305cls_pytype, *poly1305key_pytype, *poly1305hash_pytype;
1191
1192 typedef struct poly1305key_pyobj {
1193   PyHeapTypeObject ty;
1194   poly1305_key k;
1195 } poly1305key_pyobj;
1196
1197 typedef struct poly1305hash_pyobj {
1198   PyObject_HEAD
1199   unsigned f;
1200 #define f_mask 1u
1201   poly1305_ctx ctx;
1202 } poly1305hash_pyobj;
1203
1204 #define P1305_F(o) (((poly1305hash_pyobj *)(o))->f)
1205 #define P1305_CTX(o) (&((poly1305hash_pyobj *)(o))->ctx)
1206 CONVFUNC(poly1305hash, poly1305_ctx *, P1305_CTX)
1207
1208 static PyObject *poly1305hash_pynew(PyTypeObject *ty,
1209                                     PyObject *arg, PyObject *kw)
1210 {
1211   char *kwlist[] = { "mask", 0 };
1212   poly1305key_pyobj *pk = (poly1305key_pyobj *)ty;
1213   poly1305hash_pyobj *ph;
1214   char *m = 0;
1215   int sz;
1216
1217   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|s#:new", kwlist, &m, &sz))
1218     return (0);
1219   if (m && sz != POLY1305_MASKSZ) VALERR("bad mask length");
1220   ph = PyObject_NEW(poly1305hash_pyobj, ty);
1221   ph->f = 0;
1222   if (m) ph->f |= f_mask;
1223   poly1305_macinit(&ph->ctx, &pk->k, m);
1224   Py_INCREF(ty);
1225   return ((PyObject *)ph);
1226 end:
1227   return (0);
1228 }
1229
1230 static PyObject *poly1305key_pynew(PyTypeObject *ty,
1231                                    PyObject *arg, PyObject *kw)
1232 {
1233   char *kwlist[] = { "k", 0 };
1234   poly1305key_pyobj *pk;
1235   char *k;
1236   int sz;
1237
1238   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", kwlist, &k, &sz))
1239     goto end;
1240   if (keysz(sz, poly1305_keysz) != sz) VALERR("bad key length");
1241
1242   pk = newtype(ty, 0, 0);
1243   pk->ty.ht_name = PyString_FromString("poly1305(keyed)");
1244   pk->ty.ht_type.tp_basicsize = sizeof(poly1305hash_pyobj);
1245   pk->ty.ht_type.tp_name = PyString_AS_STRING(pk->ty.ht_name);
1246   pk->ty.ht_type.tp_base = poly1305hash_pytype;
1247   Py_INCREF(poly1305key_pytype);
1248   pk->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
1249                              Py_TPFLAGS_BASETYPE |
1250                              Py_TPFLAGS_HEAPTYPE);
1251   pk->ty.ht_type.tp_alloc = PyType_GenericAlloc;
1252   pk->ty.ht_type.tp_free = 0;
1253   pk->ty.ht_type.tp_new = poly1305hash_pynew;
1254   typeready(&pk->ty.ht_type);
1255
1256   poly1305_keyinit(&pk->k, k, sz);
1257   return ((PyObject *)pk);
1258
1259 end:
1260   return (0);
1261 }
1262
1263 static PyObject *poly1305clsget_name(PyObject *me, void *hunoz)
1264   { return (PyString_FromString("poly1305")); }
1265
1266 static PyObject *poly1305clsget_keysz(PyObject *me, void *hunoz)
1267   { return (keysz_pywrap(poly1305_keysz)); }
1268
1269 static PyObject *poly1305clsget_masksz(PyObject *me, void *hunoz)
1270   { return (PyInt_FromLong(POLY1305_MASKSZ)); }
1271
1272 static PyObject *poly1305clsget_tagsz(PyObject *me, void *hunoz)
1273   { return (PyInt_FromLong(POLY1305_TAGSZ)); }
1274
1275 static PyObject *polymeth_copy(PyObject *me, PyObject *arg)
1276 {
1277   poly1305hash_pyobj *ph;
1278   if (!PyArg_ParseTuple(arg, ":copy")) return (0);
1279   ph = PyObject_NEW(poly1305hash_pyobj, me->ob_type);
1280   poly1305_copy(&ph->ctx, P1305_CTX(me));
1281   Py_INCREF(me->ob_type);
1282   return ((PyObject *)ph);
1283 }
1284
1285 static PyObject *polymeth_hash(PyObject *me, PyObject *arg)
1286 {
1287   char *p;
1288   int sz;
1289   if (!PyArg_ParseTuple(arg, "s#:hash", &p, &sz)) return (0);
1290   poly1305_hash(P1305_CTX(me), p, sz);
1291   RETURN_ME;
1292 }
1293
1294 #define POLYMETH_HASHU_(n, W, w)                                        \
1295   static PyObject *polymeth_hashu##w(PyObject *me, PyObject *arg)       \
1296   {                                                                     \
1297     uint##n x;                                                          \
1298     octet b[SZ_##W];                                                    \
1299     if (!PyArg_ParseTuple(arg, "O&:hashu" #w, convu##n, &x)) goto end;  \
1300     STORE##W(b, n); poly1305_hash(P1305_CTX(me), b, sizeof(b));         \
1301     RETURN_ME;                                                          \
1302   end:                                                                  \
1303     return (0);                                                         \
1304   }
1305 DOUINTCONV(POLYMETH_HASHU_)
1306
1307 #define POLYMETH_HASHBUF_(n, W, w)                                      \
1308   static PyObject *polymeth_hashbuf##w(PyObject *me, PyObject *arg)     \
1309   {                                                                     \
1310     char *p;                                                            \
1311     int sz;                                                             \
1312     octet b[SZ_##W];                                                    \
1313     if (!PyArg_ParseTuple(arg, "s#:hashbuf" #w, &p, &sz)) goto end;     \
1314     if (sz > MASK##n) TYERR("string too long");                         \
1315     STORE##W(b, n); poly1305_hash(P1305_CTX(me), b, sizeof(b));         \
1316     poly1305_hash(P1305_CTX(me), p, sz);                                \
1317     RETURN_ME;                                                          \
1318   end:                                                                  \
1319     return (0);                                                         \
1320   }
1321 DOUINTCONV(POLYMETH_HASHBUF_)
1322
1323 static PyObject *polymeth_hashstrz(PyObject *me, PyObject *arg)
1324 {
1325   char *p;
1326   if (!PyArg_ParseTuple(arg, "s:hashstrz", &p)) return (0);
1327   poly1305_hash(P1305_CTX(me), p, strlen(p) + 1);
1328   RETURN_ME;
1329 }
1330
1331 static PyObject *polymeth_flush(PyObject *me, PyObject *arg)
1332 {
1333   if (!PyArg_ParseTuple(arg, ":flush")) return (0);
1334   poly1305_flush(P1305_CTX(me));
1335   RETURN_ME;
1336 }
1337
1338 static PyObject *polymeth_concat(PyObject *me, PyObject *arg)
1339 {
1340   PyObject *pre, *suff;
1341   if (!PyArg_ParseTuple(arg, "OO:concat", &pre, &suff)) return (0);
1342   if (!PyObject_TypeCheck(pre, poly1305hash_pytype) ||
1343       !PyObject_TypeCheck(suff, poly1305hash_pytype))
1344     TYERR("wanted a poly1305hash");
1345   if (me->ob_type != pre->ob_type || me->ob_type != suff->ob_type)
1346     TYERR("key mismatch");
1347   if (P1305_CTX(pre)->nbuf) VALERR("prefix is not block-aligned");
1348   poly1305_concat(P1305_CTX(me), P1305_CTX(pre), P1305_CTX(suff));
1349   RETURN_ME;
1350 end:
1351   return (0);
1352 }
1353
1354 static PyObject *polymeth_done(PyObject *me, PyObject *arg)
1355 {
1356   PyObject *rc;
1357   if (!PyArg_ParseTuple(arg, ":done")) return (0);
1358   if (!(P1305_F(me) & f_mask)) VALERR("no mask");
1359   rc = bytestring_pywrap(0, POLY1305_TAGSZ);
1360   poly1305_done(P1305_CTX(me), PyString_AS_STRING(rc));
1361   return (rc);
1362 end:
1363   return (0);
1364 }
1365
1366 static PyGetSetDef poly1305cls_pygetset[] = {
1367 #define GETSETNAME(op, name) poly1305cls##op##_##name
1368   GET   (keysz,                 "PC.keysz -> acceptable key sizes")
1369   GET   (masksz,                "PC.masksz -> mask size")
1370   GET   (tagsz,                 "PC.tagsz -> MAC output size")
1371   GET   (name,                  "PC.name -> name of this kind of MAC")
1372 #undef GETSETNAME
1373   { 0 }
1374 };
1375
1376 static PyMethodDef poly1305hash_pymethods[] = {
1377 #define METHNAME(name) polymeth_##name
1378   METH  (copy,                  "P.copy() -> PP")
1379   METH  (hash,                  "P.hash(M)")
1380 #define METHU_(n, W, w) METH(hashu##w, "P.hashu" #w "(WORD)")
1381   DOUINTCONV(METHU_)
1382 #undef METHU_
1383 #define METHBUF_(n, W, w) METH(hashbuf##w, "P.hashbuf" #w "(BYTES)")
1384   DOUINTCONV(METHBUF_)
1385 #undef METHBUF_
1386   METH  (hashstrz,              "P.hashstrz(STRING)")
1387   METH  (flush,                 "P.flush()")
1388   METH  (concat,                "P.concat(PREFIX, SUFFIX)")
1389   METH  (done,                  "P.done() -> TAG")
1390 #undef METHNAME
1391   { 0 }
1392 };
1393
1394 static PyTypeObject poly1305cls_pytype_skel = {
1395   PyObject_HEAD_INIT(0) 0,              /* Header */
1396   "Poly1305Class",                      /* @tp_name@ */
1397   sizeof(PyHeapTypeObject),             /* @tp_basicsize@ */
1398   0,                                    /* @tp_itemsize@ */
1399
1400   0,                                    /* @tp_dealloc@ */
1401   0,                                    /* @tp_print@ */
1402   0,                                    /* @tp_getattr@ */
1403   0,                                    /* @tp_setattr@ */
1404   0,                                    /* @tp_compare@ */
1405   0,                                    /* @tp_repr@ */
1406   0,                                    /* @tp_as_number@ */
1407   0,                                    /* @tp_as_sequence@ */
1408   0,                                    /* @tp_as_mapping@ */
1409   0,                                    /* @tp_hash@ */
1410   0,                                    /* @tp_call@ */
1411   0,                                    /* @tp_str@ */
1412   0,                                    /* @tp_getattro@ */
1413   0,                                    /* @tp_setattro@ */
1414   0,                                    /* @tp_as_buffer@ */
1415   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1416     Py_TPFLAGS_BASETYPE,
1417
1418   /* @tp_doc@ */
1419 "Poly1305 metametaclass.  Best not to ask.",
1420
1421   0,                                    /* @tp_traverse@ */
1422   0,                                    /* @tp_clear@ */
1423   0,                                    /* @tp_richcompare@ */
1424   0,                                    /* @tp_weaklistoffset@ */
1425   0,                                    /* @tp_iter@ */
1426   0,                                    /* @tp_iternext@ */
1427   0,                                    /* @tp_methods@ */
1428   0,                                    /* @tp_members@ */
1429   poly1305cls_pygetset,                 /* @tp_getset@ */
1430   0,                                    /* @tp_base@ */
1431   0,                                    /* @tp_dict@ */
1432   0,                                    /* @tp_descr_get@ */
1433   0,                                    /* @tp_descr_set@ */
1434   0,                                    /* @tp_dictoffset@ */
1435   0,                                    /* @tp_init@ */
1436   PyType_GenericAlloc,                  /* @tp_alloc@ */
1437   abstract_pynew,                       /* @tp_new@ */
1438   0,                                    /* @tp_free@ */
1439   0                                     /* @tp_is_gc@ */
1440 };
1441
1442 static PyTypeObject poly1305key_pytype_skel = {
1443   PyObject_HEAD_INIT(0) 0,              /* Header */
1444   "poly1305",                           /* @tp_name@ */
1445   sizeof(poly1305key_pyobj),            /* @tp_basicsize@ */
1446   0,                                    /* @tp_itemsize@ */
1447
1448   0,                                    /* @tp_dealloc@ */
1449   0,                                    /* @tp_print@ */
1450   0,                                    /* @tp_getattr@ */
1451   0,                                    /* @tp_setattr@ */
1452   0,                                    /* @tp_compare@ */
1453   0,                                    /* @tp_repr@ */
1454   0,                                    /* @tp_as_number@ */
1455   0,                                    /* @tp_as_sequence@ */
1456   0,                                    /* @tp_as_mapping@ */
1457   0,                                    /* @tp_hash@ */
1458   0,                                    /* @tp_call@ */
1459   0,                                    /* @tp_str@ */
1460   0,                                    /* @tp_getattro@ */
1461   0,                                    /* @tp_setattro@ */
1462   0,                                    /* @tp_as_buffer@ */
1463   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1464     Py_TPFLAGS_BASETYPE,
1465
1466   /* @tp_doc@ */
1467 "Poly1305 key.",
1468
1469   0,                                    /* @tp_traverse@ */
1470   0,                                    /* @tp_clear@ */
1471   0,                                    /* @tp_richcompare@ */
1472   0,                                    /* @tp_weaklistoffset@ */
1473   0,                                    /* @tp_iter@ */
1474   0,                                    /* @tp_iternext@ */
1475   0,                                    /* @tp_methods@ */
1476   0,                                    /* @tp_members@ */
1477   0,                                    /* @tp_getset@ */
1478   0,                                    /* @tp_base@ */
1479   0,                                    /* @tp_dict@ */
1480   0,                                    /* @tp_descr_get@ */
1481   0,                                    /* @tp_descr_set@ */
1482   0,                                    /* @tp_dictoffset@ */
1483   0,                                    /* @tp_init@ */
1484   PyType_GenericAlloc,                  /* @tp_alloc@ */
1485   poly1305key_pynew,                    /* @tp_new@ */
1486   0,                                    /* @tp_free@ */
1487   0                                     /* @tp_is_gc@ */
1488 };
1489
1490 static PyTypeObject poly1305hash_pytype_skel = {
1491   PyObject_HEAD_INIT(0) 0,              /* Header */
1492   "Poly1305Hash",                       /* @tp_name@ */
1493   sizeof(poly1305hash_pyobj),           /* @tp_basicsize@ */
1494   0,                                    /* @tp_itemsize@ */
1495
1496   0,                                    /* @tp_dealloc@ */
1497   0,                                    /* @tp_print@ */
1498   0,                                    /* @tp_getattr@ */
1499   0,                                    /* @tp_setattr@ */
1500   0,                                    /* @tp_compare@ */
1501   0,                                    /* @tp_repr@ */
1502   0,                                    /* @tp_as_number@ */
1503   0,                                    /* @tp_as_sequence@ */
1504   0,                                    /* @tp_as_mapping@ */
1505   0,                                    /* @tp_hash@ */
1506   0,                                    /* @tp_call@ */
1507   0,                                    /* @tp_str@ */
1508   0,                                    /* @tp_getattro@ */
1509   0,                                    /* @tp_setattro@ */
1510   0,                                    /* @tp_as_buffer@ */
1511   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1512     Py_TPFLAGS_BASETYPE,
1513
1514   /* @tp_doc@ */
1515 "Poly1305 MAC context base class.",
1516
1517   0,                                    /* @tp_traverse@ */
1518   0,                                    /* @tp_clear@ */
1519   0,                                    /* @tp_richcompare@ */
1520   0,                                    /* @tp_weaklistoffset@ */
1521   0,                                    /* @tp_iter@ */
1522   0,                                    /* @tp_iternext@ */
1523   poly1305hash_pymethods,               /* @tp_methods@ */
1524   0,                                    /* @tp_members@ */
1525   0,                                    /* @tp_getset@ */
1526   0,                                    /* @tp_base@ */
1527   0,                                    /* @tp_dict@ */
1528   0,                                    /* @tp_descr_get@ */
1529   0,                                    /* @tp_descr_set@ */
1530   0,                                    /* @tp_dictoffset@ */
1531   0,                                    /* @tp_init@ */
1532   PyType_GenericAlloc,                  /* @tp_alloc@ */
1533   abstract_pynew,                       /* @tp_new@ */
1534   0,                                    /* @tp_free@ */
1535   0                                     /* @tp_is_gc@ */
1536 };
1537
1538
1539 /*----- Pseudorandom permutations -----------------------------------------*/
1540
1541 static PyTypeObject *gcprp_pytype, *gprp_pytype;
1542
1543 typedef struct prpinfo {
1544   const char *name;
1545   const octet *keysz;
1546   size_t ctxsz;
1547   size_t blksz;
1548   void (*init)(void *, const void *, size_t);
1549   void (*eblk)(void *, const void *, void *);
1550   void (*dblk)(void *, const void *, void *);
1551 } prpinfo;
1552
1553 #define PRP_DEF(PRE, pre)                                               \
1554   static void pre##_prpinit(void *ctx, const void *k, size_t ksz)       \
1555     { pre##_init(ctx, k, ksz); }                                        \
1556   static void pre##_prpeblk(void *ctx, const void *in, void *out)       \
1557   {                                                                     \
1558     uint32 w[PRE##_BLKSZ/4]; BLKC_LOAD(PRE, w, in);                     \
1559     pre##_eblk(ctx, w, w); BLKC_STORE(PRE, out, w);                     \
1560   }                                                                     \
1561   static void pre##_prpdblk(void *ctx, const void *in, void *out)       \
1562   {                                                                     \
1563     uint32 w[PRE##_BLKSZ/4]; BLKC_LOAD(PRE, w, in);                     \
1564     pre##_dblk(ctx, w, w); BLKC_STORE(PRE, out, w);                     \
1565   }                                                                     \
1566   static const prpinfo pre##_prpinfo = {                                \
1567     #pre, pre##_keysz, sizeof(pre##_ctx), PRE##_BLKSZ,                  \
1568     pre##_prpinit, pre##_prpeblk, pre##_prpdblk                         \
1569   };
1570 PRPS(PRP_DEF)
1571
1572 static const struct prpinfo *const gprptab[] = {
1573 #define PRP_ENTRY(PRE, pre) &pre##_prpinfo,
1574   PRPS(PRP_ENTRY)
1575   0
1576 };
1577
1578 typedef struct gcprp_pyobj {
1579   PyHeapTypeObject ty;
1580   const prpinfo *prp;
1581 } gcprp_pyobj;
1582 #define GCPRP_PRP(o) (((gcprp_pyobj *)(o))->prp)
1583
1584 typedef struct gprp_pyobj {
1585   PyObject_HEAD
1586   const prpinfo *prp;
1587 } gprp_pyobj;
1588 #define GPRP_PRP(o) (((gprp_pyobj *)(o))->prp)
1589 #define GPRP_CTX(o) (((gprp_pyobj *)(o)) + 1)
1590
1591 typedef struct prp {
1592   const prpinfo *prp;
1593   void *ctx;
1594 } prp;
1595
1596 static PyObject *gprp_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
1597 {
1598   char *kwlist[] = { "key", 0 };
1599   char *k;
1600   int sz;
1601   const prpinfo *prp = GCPRP_PRP(ty);
1602   PyObject *me;
1603
1604   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", kwlist, &k, &sz))
1605     goto end;
1606   if (keysz(sz, prp->keysz) != sz) VALERR("bad key length");
1607   me = (PyObject *)ty->tp_alloc(ty, 0);
1608   GPRP_PRP(me) = prp;
1609   prp->init(GPRP_CTX(me), k, sz);
1610   Py_INCREF(me);
1611   return (me);
1612 end:
1613   return (0);
1614 }
1615
1616 static void gprp_pydealloc(PyObject *me)
1617   { Py_DECREF(me->ob_type); FREEOBJ(me); }
1618
1619 static PyObject *gcprp_pywrap(const prpinfo *prp)
1620 {
1621   gcprp_pyobj *g = newtype(gcprp_pytype, 0, prp->name);
1622   g->prp = prp;
1623   g->ty.ht_type.tp_basicsize = sizeof(gprp_pyobj) + prp->ctxsz;
1624   g->ty.ht_type.tp_base = gprp_pytype;
1625   Py_INCREF(gprp_pytype);
1626   g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
1627                             Py_TPFLAGS_BASETYPE |
1628                             Py_TPFLAGS_HEAPTYPE);
1629   g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
1630   g->ty.ht_type.tp_free = 0;
1631   g->ty.ht_type.tp_new = gprp_pynew;
1632   typeready(&g->ty.ht_type);
1633   return ((PyObject *)g);
1634 }
1635
1636 static PyObject *gcpget_name(PyObject *me, void *hunoz)
1637   { return (PyString_FromString(GCPRP_PRP(me)->name)); }
1638 static PyObject *gcpget_keysz(PyObject *me, void *hunoz)
1639   { return (keysz_pywrap(GCPRP_PRP(me)->keysz)); }
1640 static PyObject *gcpget_blksz(PyObject *me, void *hunoz)
1641   { return (PyInt_FromLong(GCPRP_PRP(me)->blksz)); }
1642
1643 static PyObject *gpmeth_encrypt(PyObject *me, PyObject *arg)
1644 {
1645   char *p;
1646   int n;
1647   PyObject *rc = 0;
1648
1649   if (!PyArg_ParseTuple(arg, "s#:encrypt", &p, &n)) goto end;
1650   if (n != GPRP_PRP(me)->blksz) VALERR("incorrect block length");
1651   rc = bytestring_pywrap(0, n);
1652   GPRP_PRP(me)->eblk(GPRP_CTX(me), p, PyString_AS_STRING(rc));
1653 end:
1654   return (rc);
1655 }
1656
1657 static PyObject *gpmeth_decrypt(PyObject *me, PyObject *arg)
1658 {
1659   char *p;
1660   int n;
1661   PyObject *rc = 0;
1662
1663   if (!PyArg_ParseTuple(arg, "s#:decrypt", &p, &n)) goto end;
1664   if (n != GPRP_PRP(me)->blksz) VALERR("incorrect block length");
1665   rc = bytestring_pywrap(0, n);
1666   GPRP_PRP(me)->dblk(GPRP_CTX(me), p, PyString_AS_STRING(rc));
1667 end:
1668   return (rc);
1669 }
1670
1671 static PyGetSetDef gcprp_pygetset[] = {
1672 #define GETSETNAME(op, name) gcp##op##_##name
1673   GET   (keysz,                 "CP.keysz -> acceptable key sizes")
1674   GET   (blksz,                 "CP.blksz -> block size")
1675   GET   (name,                  "CP.name -> name of this kind of PRP")
1676 #undef GETSETNAME
1677   { 0 }
1678 };
1679
1680 static PyMethodDef gprp_pymethods[] = {
1681 #define METHNAME(name) gpmeth_##name
1682   METH  (encrypt,               "P.encrypt(PT) -> CT")
1683   METH  (decrypt,               "P.decrypt(CT) -> PT")
1684 #undef METHNAME
1685   { 0 }
1686 };
1687
1688 static PyTypeObject gcprp_pytype_skel = {
1689   PyObject_HEAD_INIT(0) 0,              /* Header */
1690   "GCPRP",                              /* @tp_name@ */
1691   sizeof(gcprp_pyobj),                  /* @tp_basicsize@ */
1692   0,                                    /* @tp_itemsize@ */
1693
1694   0,                                    /* @tp_dealloc@ */
1695   0,                                    /* @tp_print@ */
1696   0,                                    /* @tp_getattr@ */
1697   0,                                    /* @tp_setattr@ */
1698   0,                                    /* @tp_compare@ */
1699   0,                                    /* @tp_repr@ */
1700   0,                                    /* @tp_as_number@ */
1701   0,                                    /* @tp_as_sequence@ */
1702   0,                                    /* @tp_as_mapping@ */
1703   0,                                    /* @tp_hash@ */
1704   0,                                    /* @tp_call@ */
1705   0,                                    /* @tp_str@ */
1706   0,                                    /* @tp_getattro@ */
1707   0,                                    /* @tp_setattro@ */
1708   0,                                    /* @tp_as_buffer@ */
1709   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1710     Py_TPFLAGS_BASETYPE,
1711
1712   /* @tp_doc@ */
1713 "Pseudorandom permutation metaclass.",
1714
1715   0,                                    /* @tp_traverse@ */
1716   0,                                    /* @tp_clear@ */
1717   0,                                    /* @tp_richcompare@ */
1718   0,                                    /* @tp_weaklistoffset@ */
1719   0,                                    /* @tp_iter@ */
1720   0,                                    /* @tp_iternext@ */
1721   0,                                    /* @tp_methods@ */
1722   0,                                    /* @tp_members@ */
1723   gcprp_pygetset,                       /* @tp_getset@ */
1724   0,                                    /* @tp_base@ */
1725   0,                                    /* @tp_dict@ */
1726   0,                                    /* @tp_descr_get@ */
1727   0,                                    /* @tp_descr_set@ */
1728   0,                                    /* @tp_dictoffset@ */
1729   0,                                    /* @tp_init@ */
1730   PyType_GenericAlloc,                  /* @tp_alloc@ */
1731   abstract_pynew,                       /* @tp_new@ */
1732   0,                                    /* @tp_free@ */
1733   0                                     /* @tp_is_gc@ */
1734 };
1735
1736 static PyTypeObject gprp_pytype_skel = {
1737   PyObject_HEAD_INIT(0) 0,              /* Header */
1738   "GPRP",                               /* @tp_name@ */
1739   sizeof(gprp_pyobj),                   /* @tp_basicsize@ */
1740   0,                                    /* @tp_itemsize@ */
1741
1742   gprp_pydealloc,                       /* @tp_dealloc@ */
1743   0,                                    /* @tp_print@ */
1744   0,                                    /* @tp_getattr@ */
1745   0,                                    /* @tp_setattr@ */
1746   0,                                    /* @tp_compare@ */
1747   0,                                    /* @tp_repr@ */
1748   0,                                    /* @tp_as_number@ */
1749   0,                                    /* @tp_as_sequence@ */
1750   0,                                    /* @tp_as_mapping@ */
1751   0,                                    /* @tp_hash@ */
1752   0,                                    /* @tp_call@ */
1753   0,                                    /* @tp_str@ */
1754   0,                                    /* @tp_getattro@ */
1755   0,                                    /* @tp_setattro@ */
1756   0,                                    /* @tp_as_buffer@ */
1757   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
1758     Py_TPFLAGS_BASETYPE,
1759
1760   /* @tp_doc@ */
1761 "Pseudorandom permutation, abstract base class.",
1762
1763   0,                                    /* @tp_traverse@ */
1764   0,                                    /* @tp_clear@ */
1765   0,                                    /* @tp_richcompare@ */
1766   0,                                    /* @tp_weaklistoffset@ */
1767   0,                                    /* @tp_iter@ */
1768   0,                                    /* @tp_iternext@ */
1769   gprp_pymethods,                       /* @tp_methods@ */
1770   0,                                    /* @tp_members@ */
1771   0,                                    /* @tp_getset@ */
1772   0,                                    /* @tp_base@ */
1773   0,                                    /* @tp_dict@ */
1774   0,                                    /* @tp_descr_get@ */
1775   0,                                    /* @tp_descr_set@ */
1776   0,                                    /* @tp_dictoffset@ */
1777   0,                                    /* @tp_init@ */
1778   PyType_GenericAlloc,                  /* @tp_alloc@ */
1779   abstract_pynew,                       /* @tp_new@ */
1780   0,                                    /* @tp_free@ */
1781   0                                     /* @tp_is_gc@ */
1782 };
1783
1784 /*----- Main code ---------------------------------------------------------*/
1785
1786 static PyMethodDef methods[] = {
1787 #define METHNAME(func) meth_##func
1788   METH  (_KeySZ_fromdl,         "\
1789 fromdl(N) -> M: convert integer discrete log field size to work factor")
1790   METH  (_KeySZ_fromschnorr,    "\
1791 fromschnorr(N) -> M: convert Schnorr group order to work factor")
1792   METH  (_KeySZ_fromif,         "\
1793 fromif(N) -> M: convert integer factorization problem size to work factor")
1794   METH  (_KeySZ_fromec,         "\
1795 fromec(N) -> M: convert elliptic curve group order to work factor")
1796   METH  (_KeySZ_todl,           "\
1797 todl(N) -> M: convert work factor to integer discrete log field size")
1798   METH  (_KeySZ_toschnorr,      "\
1799 toschnorr(N) -> M: convert work factor to Schnorr group order")
1800   METH  (_KeySZ_toif,           "\
1801 toif(N) -> M: convert work factor to integer factorization problem size")
1802   METH  (_KeySZ_toec,           "\
1803 toec(N) -> M: convert work factor to elliptic curve group order")
1804 #undef METHNAME
1805   { 0 }
1806 };
1807
1808 void algorithms_pyinit(void)
1809 {
1810   INITTYPE(keysz, root);
1811   INITTYPE(keyszany, keysz);
1812   INITTYPE(keyszrange, keysz);
1813   INITTYPE(keyszset, keysz);
1814   INITTYPE(gccipher, type);
1815   INITTYPE(gcipher, root);
1816   INITTYPE(gchash, type);
1817   INITTYPE(ghash, root);
1818   INITTYPE(gcmac, type);
1819   INITTYPE(gmac, type);
1820   INITTYPE(gmhash, ghash);
1821   INITTYPE(poly1305cls, type);
1822   INITTYPE_META(poly1305key, type, poly1305cls);
1823   INITTYPE(poly1305hash, root);
1824   INITTYPE(gcprp, type);
1825   INITTYPE(gprp, root);
1826   addmethods(methods);
1827 }
1828
1829 GEN(gcciphers, cipher)
1830 GEN(gchashes, hash)
1831 GEN(gcmacs, mac)
1832 #define gcprp prpinfo
1833 GEN(gcprps, prp)
1834
1835 void algorithms_pyinsert(PyObject *mod)
1836 {
1837   PyObject *d;
1838   INSERT("KeySZ", keysz_pytype);
1839   INSERT("KeySZAny", keyszany_pytype);
1840   INSERT("KeySZRange", keyszrange_pytype);
1841   INSERT("KeySZSet", keyszset_pytype);
1842   INSERT("GCCipher", gccipher_pytype);
1843   INSERT("GCipher", gcipher_pytype);
1844   INSERT("gcciphers", gcciphers());
1845   INSERT("GCHash", gchash_pytype);
1846   INSERT("GHash", ghash_pytype);
1847   INSERT("gchashes", d = gchashes());
1848   sha_pyobj = PyDict_GetItemString(d, "sha"); Py_INCREF(sha_pyobj);
1849   has160_pyobj = PyDict_GetItemString(d, "has160"); Py_INCREF(has160_pyobj);
1850   INSERT("GCMAC", gcmac_pytype);
1851   INSERT("GMAC", gmac_pytype);
1852   INSERT("GMACHash", gmhash_pytype);
1853   INSERT("gcmacs", gcmacs());
1854   INSERT("Poly1305Class", poly1305cls_pytype);
1855   INSERT("poly1305", poly1305key_pytype);
1856   INSERT("Poly1305Hash", poly1305hash_pytype);
1857   INSERT("GCPRP", gcprp_pytype);
1858   INSERT("GPRP", gprp_pytype);
1859   INSERT("gcprps", gcprps());
1860 }
1861
1862 /*----- That's all, folks -------------------------------------------------*/