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