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

   1 /* -*-c-*-
   2  *
   3  * Public-key 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
  31 /*----- DSA and similar ---------------------------------------------------*/
  32
  33 typedef struct dsa_pyobj {
  34   PyObject_HEAD
  35   PyObject *G, *u, *p, *rng, *hash;
  36   gdsa d;
  37 } dsa_pyobj;
  38
  39 static PyTypeObject *dsapub_pytype, *dsapriv_pytype;
  40 static PyTypeObject *kcdsapub_pytype, *kcdsapriv_pytype;
  41 #define DSA_D(o) (&((dsa_pyobj *)(o))->d)
  42 #define DSA_G(o) (((dsa_pyobj *)(o))->G)
  43 #define DSA_U(o) (((dsa_pyobj *)(o))->u)
  44 #define DSA_P(o) (((dsa_pyobj *)(o))->p)
  45 #define DSA_RNG(o) (((dsa_pyobj *)(o))->rng)
  46 #define DSA_HASH(o) (((dsa_pyobj *)(o))->hash)
  47
  48 static void dsa_pydealloc(PyObject *me)
  49 {
  50   dsa_pyobj *g = (dsa_pyobj *)me;
  51   Py_DECREF(g->G); Py_DECREF(g->u); Py_DECREF(g->p);
  52   Py_DECREF(g->rng); Py_DECREF(g->hash);
  53   FREEOBJ(me);
  54 }
  55
  56 static PyObject *dsa_setup(PyTypeObject *ty, PyObject *G, PyObject *u,
  57                            PyObject *p, PyObject *rng, PyObject *hash,
  58                            void (*calcpub)(group *, ge *, mp *))
  59 {
  60   dsa_pyobj *g;
  61   ge *pp;
  62
  63   g = PyObject_New(dsa_pyobj, ty);
  64   if (p) Py_INCREF(p);
  65   if (!u) {
  66     g->d.u = 0;
  67     u = Py_None;
  68   } else {
  69     if ((g->d.u = getmp(u)) == 0)
  70       goto end;
  71     if (MP_PYCHECK(u)) Py_INCREF(u);
  72     else u = mp_pywrap(g->d.u);
  73   }
  74   if (!p) {
  75     assert(g->d.u); assert(calcpub);
  76     pp = G_CREATE(GROUP_G(G));
  77     calcpub(GROUP_G(G), pp, g->d.u);
  78     p = ge_pywrap(G, pp);
  79   } else if (GROUP_G(G) != GE_G(p) && !group_samep(GROUP_G(G), GE_G(p)))
  80     TYERR("public key not from group");
  81   g->d.g = GROUP_G(G);
  82   g->d.p = GE_X(p);
  83   g->d.r = GRAND_R(rng);
  84   g->d.h = GCHASH_CH(hash);
  85   g->G = G; Py_INCREF(G); g->u = u; g->p = p;
  86   g->rng = rng; Py_INCREF(rng); g->hash = hash; Py_INCREF(hash);
  87   return ((PyObject *)g);
  88 end:
  89   Py_XDECREF(p); FREEOBJ(g);
  90   return (0);
  91 }
  92
  93 static PyObject *dsapub_pynew(PyTypeObject *ty,
  94                               PyObject *arg, PyObject *kw)
  95 {
  96   PyObject *G, *p, *rng = rand_pyobj, *hash = sha_pyobj;
  97   PyObject *rc = 0;
  98   static const char *const kwlist[] = { "G", "p", "hash", "rng", 0 };
  99
 100   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O!|O!O!:new", KWLIST,
 101                                    group_pytype, &G,
 102                                    ge_pytype, &p,
 103                                    gchash_pytype, &hash,
 104                                    grand_pytype, &rng) ||
 105       (rc = dsa_setup(dsapub_pytype, G, 0, p, rng, hash, 0)) == 0)
 106     goto end;
 107 end:
 108   return (rc);
 109 }
 110
 111 static PyObject *dsameth_beginhash(PyObject *me, PyObject *arg)
 112 {
 113   if (!PyArg_ParseTuple(arg, ":beginhash")) return (0);
 114   return (ghash_pywrap(DSA_HASH(me), gdsa_beginhash(DSA_D(me))));
 115 }
 116
 117 static PyObject *dsameth_endhash(PyObject *me, PyObject *arg)
 118 {
 119   ghash *h;
 120   PyObject *rc;
 121   if (!PyArg_ParseTuple(arg, "O&:endhash", convghash, &h)) return (0);
 122   gdsa_endhash(DSA_D(me), h);
 123   h = GH_COPY(h);
 124   rc = bytestring_pywrap(0, GH_CLASS(h)->hashsz);
 125   GH_DONE(h, PyString_AS_STRING(rc));
 126   GH_DESTROY(h);
 127   return (rc);
 128 }
 129
 130 static PyObject *dsameth_sign(PyObject *me, PyObject *arg, PyObject *kw)
 131 {
 132   gdsa_sig s = GDSA_SIG_INIT;
 133   char *p;
 134   Py_ssize_t n;
 135   mp *k = 0;
 136   PyObject *rc = 0;
 137   static const char *const kwlist[] = { "msg", "k", 0 };
 138
 139   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#|O&:sign", KWLIST,
 140                                    &p, &n, convmp, &k))
 141     goto end;
 142   if (n != DSA_D(me)->h->hashsz)
 143     VALERR("bad message length (doesn't match hash size)");
 144   gdsa_sign(DSA_D(me), &s, p, k);
 145   rc = Py_BuildValue("(NN)", mp_pywrap(s.r), mp_pywrap(s.s));
 146 end:
 147   mp_drop(k);
 148   return (rc);
 149 }
 150
 151 static PyObject *dsameth_verify(PyObject *me, PyObject *arg)
 152 {
 153   char *p;
 154   Py_ssize_t n;
 155   gdsa_sig s = GDSA_SIG_INIT;
 156   PyObject *rc = 0;
 157
 158   if (!PyArg_ParseTuple(arg, "s#(O&O&):verify",
 159                         &p, &n, convmp, &s.r, convmp, &s.s))
 160     goto end;
 161   if (n != DSA_D(me)->h->hashsz)
 162     VALERR("bad message length (doesn't match hash size)");
 163   rc = getbool(!gdsa_verify(DSA_D(me), &s, p));
 164 end:
 165   mp_drop(s.r);
 166   mp_drop(s.s);
 167   return (rc);
 168 }
 169
 170 static void dsa_calcpub(group *g, ge *p, mp *u) { G_EXP(g, p, g->g, u); }
 171
 172 static PyObject *dsapriv_pynew(PyTypeObject *ty,
 173                                PyObject *arg, PyObject *kw)
 174 {
 175   PyObject *G, *p = 0, *u, *rng = rand_pyobj, *hash = sha_pyobj;
 176   PyObject *rc = 0;
 177   static const char *const kwlist[] = { "G", "u", "p", "hash", "rng", 0 };
 178
 179   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O|O!O!O!:new", KWLIST,
 180                                    group_pytype, &G,
 181                                    &u,
 182                                    ge_pytype, &p,
 183                                    gchash_pytype, &hash,
 184                                    grand_pytype, &rng) ||
 185       (rc = dsa_setup(dsapriv_pytype, G, u, p, rng, hash, dsa_calcpub)) == 0)
 186     goto end;
 187 end:
 188   return (rc);
 189 }
 190
 191 static PyMethodDef dsapub_pymethods[] = {
 192 #define METHNAME(name) dsameth_##name
 193   METH  (beginhash,     "D.beginhash() -> hash object")
 194   METH  (endhash,       "D.endhash(H) -> BYTES")
 195   METH  (verify,        "D.verify(MSG, (R, S)) -> true/false")
 196 #undef METHNAME
 197   { 0 }
 198 };
 199
 200 static PyMethodDef dsapriv_pymethods[] = {
 201 #define METHNAME(name) dsameth_##name
 202   KWMETH(sign,          "D.sign(MSG, [k = K]) -> R, S")
 203 #undef METHNAME
 204   { 0 }
 205 };
 206
 207 static PyMemberDef dsapub_pymembers[] = {
 208 #define MEMBERSTRUCT dsa_pyobj
 209   MEMBER(G,     T_OBJECT, READONLY, "D.G -> group to work in")
 210   MEMBER(p,     T_OBJECT, READONLY, "D.p -> public key (group element")
 211   MEMBER(rng,   T_OBJECT, READONLY, "D.rng -> random number generator")
 212   MEMBER(hash,  T_OBJECT, READONLY, "D.hash -> hash class")
 213 #undef MEMBERSTRUCT
 214   { 0 }
 215 };
 216
 217 static PyMemberDef dsapriv_pymembers[] = {
 218 #define MEMBERSTRUCT dsa_pyobj
 219   MEMBER(u,     T_OBJECT, READONLY, "D.u -> private key (exponent)")
 220 #undef MEMBERSTRUCT
 221   { 0 }
 222 };
 223
 224 static PyTypeObject dsapub_pytype_skel = {
 225   PyObject_HEAD_INIT(0) 0,              /* Header */
 226   "DSAPub",                             /* @tp_name@ */
 227   sizeof(dsa_pyobj),                    /* @tp_basicsize@ */
 228   0,                                    /* @tp_itemsize@ */
 229
 230   dsa_pydealloc,                        /* @tp_dealloc@ */
 231   0,                                    /* @tp_print@ */
 232   0,                                    /* @tp_getattr@ */
 233   0,                                    /* @tp_setattr@ */
 234   0,                                    /* @tp_compare@ */
 235   0,                                    /* @tp_repr@ */
 236   0,                                    /* @tp_as_number@ */
 237   0,                                    /* @tp_as_sequence@ */
 238   0,                                    /* @tp_as_mapping@ */
 239   0,                                    /* @tp_hash@ */
 240   0,                                    /* @tp_call@ */
 241   0,                                    /* @tp_str@ */
 242   0,                                    /* @tp_getattro@ */
 243   0,                                    /* @tp_setattro@ */
 244   0,                                    /* @tp_as_buffer@ */
 245   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 246     Py_TPFLAGS_BASETYPE,
 247
 248   /* @tp_doc@ */
 249   "DSAPub(GROUP, P, [hash = sha], [rng = rand]): DSA public key.",
 250
 251   0,                                    /* @tp_traverse@ */
 252   0,                                    /* @tp_clear@ */
 253   0,                                    /* @tp_richcompare@ */
 254   0,                                    /* @tp_weaklistoffset@ */
 255   0,                                    /* @tp_iter@ */
 256   0,                                    /* @tp_iternext@ */
 257   dsapub_pymethods,                     /* @tp_methods@ */
 258   dsapub_pymembers,                     /* @tp_members@ */
 259   0,                                    /* @tp_getset@ */
 260   0,                                    /* @tp_base@ */
 261   0,                                    /* @tp_dict@ */
 262   0,                                    /* @tp_descr_get@ */
 263   0,                                    /* @tp_descr_set@ */
 264   0,                                    /* @tp_dictoffset@ */
 265   0,                                    /* @tp_init@ */
 266   PyType_GenericAlloc,                  /* @tp_alloc@ */
 267   dsapub_pynew,                         /* @tp_new@ */
 268   0,                                    /* @tp_free@ */
 269   0                                     /* @tp_is_gc@ */
 270 };
 271
 272 static PyTypeObject dsapriv_pytype_skel = {
 273   PyObject_HEAD_INIT(0) 0,              /* Header */
 274   "DSAPriv",                            /* @tp_name@ */
 275   sizeof(dsa_pyobj),                    /* @tp_basicsize@ */
 276   0,                                    /* @tp_itemsize@ */
 277
 278   0,                                    /* @tp_dealloc@ */
 279   0,                                    /* @tp_print@ */
 280   0,                                    /* @tp_getattr@ */
 281   0,                                    /* @tp_setattr@ */
 282   0,                                    /* @tp_compare@ */
 283   0,                                    /* @tp_repr@ */
 284   0,                                    /* @tp_as_number@ */
 285   0,                                    /* @tp_as_sequence@ */
 286   0,                                    /* @tp_as_mapping@ */
 287   0,                                    /* @tp_hash@ */
 288   0,                                    /* @tp_call@ */
 289   0,                                    /* @tp_str@ */
 290   0,                                    /* @tp_getattro@ */
 291   0,                                    /* @tp_setattro@ */
 292   0,                                    /* @tp_as_buffer@ */
 293   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 294     Py_TPFLAGS_BASETYPE,
 295
 296   /* @tp_doc@ */
 297   "DSAPriv(GROUP, U, [p = u G], [hash = sha], [rng = rand]): "
 298                                                           "DSA private key.",
 299
 300   0,                                    /* @tp_traverse@ */
 301   0,                                    /* @tp_clear@ */
 302   0,                                    /* @tp_richcompare@ */
 303   0,                                    /* @tp_weaklistoffset@ */
 304   0,                                    /* @tp_iter@ */
 305   0,                                    /* @tp_iternext@ */
 306   dsapriv_pymethods,                    /* @tp_methods@ */
 307   dsapriv_pymembers,                    /* @tp_members@ */
 308   0,                                    /* @tp_getset@ */
 309   0,                                    /* @tp_base@ */
 310   0,                                    /* @tp_dict@ */
 311   0,                                    /* @tp_descr_get@ */
 312   0,                                    /* @tp_descr_set@ */
 313   0,                                    /* @tp_dictoffset@ */
 314   0,                                    /* @tp_init@ */
 315   PyType_GenericAlloc,                  /* @tp_alloc@ */
 316   dsapriv_pynew,                        /* @tp_new@ */
 317   0,                                    /* @tp_free@ */
 318   0                                     /* @tp_is_gc@ */
 319 };
 320
 321 static PyObject *kcdsapub_pynew(PyTypeObject *ty,
 322                                 PyObject *arg, PyObject *kw)
 323 {
 324   PyObject *G, *p, *rng = rand_pyobj, *hash = has160_pyobj;
 325   PyObject *rc = 0;
 326   static const char *const kwlist[] = { "G", "p", "hash", "rng", 0 };
 327
 328   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O!|O!O!:new", KWLIST,
 329                                    group_pytype, &G,
 330                                    ge_pytype, &p,
 331                                    gchash_pytype, &hash,
 332                                    grand_pytype, &rng) ||
 333       (rc = dsa_setup(kcdsapub_pytype, G, 0, p, rng, hash, 0)) == 0)
 334     goto end;
 335 end:
 336   return (rc);
 337 }
 338
 339 static void kcdsa_calcpub(group *g, ge *p, mp *u)
 340 {
 341   mp *uinv = mp_modinv(MP_NEW, u, g->r);
 342   G_EXP(g, p, g->g, uinv);
 343   mp_drop(uinv);
 344 }
 345
 346 static PyObject *kcdsapriv_pynew(PyTypeObject *ty,
 347                                  PyObject *arg, PyObject *kw)
 348 {
 349   PyObject *G, *u, *p = 0, *rng = rand_pyobj, *hash = has160_pyobj;
 350   PyObject *rc = 0;
 351   static const char *const kwlist[] = { "G", "u", "p", "hash", "rng", 0 };
 352
 353   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O|O!O!O!:new", KWLIST,
 354                                    group_pytype, &G,
 355                                    &u,
 356                                    ge_pytype, &p,
 357                                    gchash_pytype, &hash,
 358                                    grand_pytype, &rng) ||
 359       (rc = dsa_setup(kcdsapriv_pytype, G, u, p,
 360                       rng, hash, kcdsa_calcpub)) == 0)
 361     goto end;
 362 end:
 363   return (rc);
 364 }
 365
 366 static PyObject *kcdsameth_beginhash(PyObject *me, PyObject *arg)
 367 {
 368   if (!PyArg_ParseTuple(arg, ":beginhash")) return (0);
 369   return (ghash_pywrap(DSA_HASH(me), gkcdsa_beginhash(DSA_D(me))));
 370 }
 371
 372 static PyObject *kcdsameth_endhash(PyObject *me, PyObject *arg)
 373 {
 374   ghash *h;
 375   PyObject *rc;
 376   if (!PyArg_ParseTuple(arg, "O&:endhash", convghash, &h)) return (0);
 377   gkcdsa_endhash(DSA_D(me), h);
 378   h = GH_COPY(h);
 379   rc = bytestring_pywrap(0, GH_CLASS(h)->hashsz);
 380   GH_DONE(h, PyString_AS_STRING(rc));
 381   GH_DESTROY(h);
 382   return (rc);
 383 }
 384
 385 static PyObject *kcdsameth_sign(PyObject *me, PyObject *arg, PyObject *kw)
 386 {
 387   gkcdsa_sig s = GKCDSA_SIG_INIT;
 388   char *p;
 389   Py_ssize_t n;
 390   mp *k = 0;
 391   PyObject *r = 0, *rc = 0;
 392   static const char *const kwlist[] = { "msg", "k", 0 };
 393
 394   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#|O&:sign", KWLIST,
 395                                    &p, &n, convmp, &k))
 396     goto end;
 397   if (n != DSA_D(me)->h->hashsz)
 398     VALERR("bad message length (doesn't match hash size)");
 399   r = bytestring_pywrap(0, DSA_D(me)->h->hashsz);
 400   s.r = (octet *)PyString_AS_STRING(r);
 401   gkcdsa_sign(DSA_D(me), &s, p, k);
 402   rc = Py_BuildValue("(ON)", r, mp_pywrap(s.s));
 403 end:
 404   Py_XDECREF(r);
 405   mp_drop(k);
 406   return (rc);
 407 }
 408
 409 static PyObject *kcdsameth_verify(PyObject *me, PyObject *arg)
 410 {
 411   char *p;
 412   Py_ssize_t n, rn;
 413   gkcdsa_sig s = GKCDSA_SIG_INIT;
 414   PyObject *rc = 0;
 415
 416   if (!PyArg_ParseTuple(arg, "s#(s#O&):verify",
 417                         &p, &n, &s.r, &rn, convmp, &s.s))
 418     goto end;
 419   if (n != DSA_D(me)->h->hashsz)
 420     VALERR("bad message length (doesn't match hash size)");
 421   if (rn != DSA_D(me)->h->hashsz)
 422     VALERR("bad signature `r' length (doesn't match hash size)");
 423   rc = getbool(!gkcdsa_verify(DSA_D(me), &s, p));
 424 end:
 425   mp_drop(s.s);
 426   return (rc);
 427 }
 428
 429 static PyMethodDef kcdsapub_pymethods[] = {
 430 #define METHNAME(name) kcdsameth_##name
 431   METH  (beginhash,     "D.beginhash() -> hash object")
 432   METH  (endhash,       "D.endhash(H) -> BYTES")
 433   METH  (verify,        "D.verify(MSG, (R, S)) -> true/false")
 434 #undef METHNAME
 435   { 0 }
 436 };
 437
 438 static PyMethodDef kcdsapriv_pymethods[] = {
 439 #define METHNAME(name) kcdsameth_##name
 440   KWMETH(sign,          "D.sign(MSG, [k = K]) -> R, S")
 441 #undef METHNAME
 442   { 0 }
 443 };
 444
 445 static PyTypeObject kcdsapub_pytype_skel = {
 446   PyObject_HEAD_INIT(0) 0,              /* Header */
 447   "KCDSAPub",                           /* @tp_name@ */
 448   sizeof(dsa_pyobj),                    /* @tp_basicsize@ */
 449   0,                                    /* @tp_itemsize@ */
 450
 451   dsa_pydealloc,                        /* @tp_dealloc@ */
 452   0,                                    /* @tp_print@ */
 453   0,                                    /* @tp_getattr@ */
 454   0,                                    /* @tp_setattr@ */
 455   0,                                    /* @tp_compare@ */
 456   0,                                    /* @tp_repr@ */
 457   0,                                    /* @tp_as_number@ */
 458   0,                                    /* @tp_as_sequence@ */
 459   0,                                    /* @tp_as_mapping@ */
 460   0,                                    /* @tp_hash@ */
 461   0,                                    /* @tp_call@ */
 462   0,                                    /* @tp_str@ */
 463   0,                                    /* @tp_getattro@ */
 464   0,                                    /* @tp_setattro@ */
 465   0,                                    /* @tp_as_buffer@ */
 466   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 467     Py_TPFLAGS_BASETYPE,
 468
 469   /* @tp_doc@ */
 470   "KCDSAPub(GROUP, P, [hash = sha], [rng = rand]): KCDSA public key.",
 471
 472   0,                                    /* @tp_traverse@ */
 473   0,                                    /* @tp_clear@ */
 474   0,                                    /* @tp_richcompare@ */
 475   0,                                    /* @tp_weaklistoffset@ */
 476   0,                                    /* @tp_iter@ */
 477   0,                                    /* @tp_iternext@ */
 478   kcdsapub_pymethods,                   /* @tp_methods@ */
 479   dsapub_pymembers,                     /* @tp_members@ */
 480   0,                                    /* @tp_getset@ */
 481   0,                                    /* @tp_base@ */
 482   0,                                    /* @tp_dict@ */
 483   0,                                    /* @tp_descr_get@ */
 484   0,                                    /* @tp_descr_set@ */
 485   0,                                    /* @tp_dictoffset@ */
 486   0,                                    /* @tp_init@ */
 487   PyType_GenericAlloc,                  /* @tp_alloc@ */
 488   kcdsapub_pynew,                       /* @tp_new@ */
 489   0,                                    /* @tp_free@ */
 490   0                                     /* @tp_is_gc@ */
 491 };
 492
 493 static PyTypeObject kcdsapriv_pytype_skel = {
 494   PyObject_HEAD_INIT(0) 0,              /* Header */
 495   "KCDSAPriv",                          /* @tp_name@ */
 496   sizeof(dsa_pyobj),                    /* @tp_basicsize@ */
 497   0,                                    /* @tp_itemsize@ */
 498
 499   0,                                    /* @tp_dealloc@ */
 500   0,                                    /* @tp_print@ */
 501   0,                                    /* @tp_getattr@ */
 502   0,                                    /* @tp_setattr@ */
 503   0,                                    /* @tp_compare@ */
 504   0,                                    /* @tp_repr@ */
 505   0,                                    /* @tp_as_number@ */
 506   0,                                    /* @tp_as_sequence@ */
 507   0,                                    /* @tp_as_mapping@ */
 508   0,                                    /* @tp_hash@ */
 509   0,                                    /* @tp_call@ */
 510   0,                                    /* @tp_str@ */
 511   0,                                    /* @tp_getattro@ */
 512   0,                                    /* @tp_setattro@ */
 513   0,                                    /* @tp_as_buffer@ */
 514   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 515     Py_TPFLAGS_BASETYPE,
 516
 517   /* @tp_doc@ */
 518   "KCDSAPriv(GROUP, U, [p = u G], [hash = sha], [rng = rand]): "
 519                                                         "KCDSA private key.",
 520
 521   0,                                    /* @tp_traverse@ */
 522   0,                                    /* @tp_clear@ */
 523   0,                                    /* @tp_richcompare@ */
 524   0,                                    /* @tp_weaklistoffset@ */
 525   0,                                    /* @tp_iter@ */
 526   0,                                    /* @tp_iternext@ */
 527   kcdsapriv_pymethods,                  /* @tp_methods@ */
 528   dsapriv_pymembers,                    /* @tp_members@ */
 529   0,                                    /* @tp_getset@ */
 530   0,                                    /* @tp_base@ */
 531   0,                                    /* @tp_dict@ */
 532   0,                                    /* @tp_descr_get@ */
 533   0,                                    /* @tp_descr_set@ */
 534   0,                                    /* @tp_dictoffset@ */
 535   0,                                    /* @tp_init@ */
 536   PyType_GenericAlloc,                  /* @tp_alloc@ */
 537   kcdsapriv_pynew,                      /* @tp_new@ */
 538   0,                                    /* @tp_free@ */
 539   0                                     /* @tp_is_gc@ */
 540 };
 541
 542 /*----- RSA ---------------------------------------------------------------*/
 543
 544 typedef struct rsapub_pyobj {
 545   PyObject_HEAD
 546   rsa_pub pub;
 547   rsa_pubctx pubctx;
 548 } rsapub_pyobj;
 549
 550 #define RSA_PUB(o) (&((rsapub_pyobj *)(o))->pub)
 551 #define RSA_PUBCTX(o) (&((rsapub_pyobj *)(o))->pubctx)
 552
 553 typedef struct rsapriv_pyobj {
 554   PyObject_HEAD
 555   rsa_pub pub;
 556   rsa_pubctx pubctx;
 557   rsa_priv priv;
 558   rsa_privctx privctx;
 559   PyObject *rng;
 560 } rsapriv_pyobj;
 561
 562 #define RSA_PRIV(o) (&((rsapriv_pyobj *)(o))->priv)
 563 #define RSA_PRIVCTX(o) (&((rsapriv_pyobj *)(o))->privctx)
 564 #define RSA_RNG(o) (((rsapriv_pyobj *)(o))->rng)
 565
 566 static PyTypeObject *rsapub_pytype, *rsapriv_pytype;
 567
 568 static PyObject *rsapub_pynew(PyTypeObject *ty,
 569                               PyObject *arg, PyObject *kw)
 570 {
 571   rsa_pub rp = { 0 };
 572   rsapub_pyobj *o;
 573   static const char *const kwlist[] = { "n", "e", 0 };
 574
 575   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&O&:new", KWLIST,
 576                                    convmp, &rp.n, convmp, &rp.e))
 577     goto end;
 578   if (!MP_ODDP(rp.n)) VALERR("RSA modulus must be even");
 579   o = (rsapub_pyobj *)ty->tp_alloc(ty, 0);
 580   o->pub = rp;
 581   rsa_pubcreate(&o->pubctx, &o->pub);
 582   return ((PyObject *)o);
 583 end:
 584   rsa_pubfree(&rp);
 585   return (0);
 586 }
 587
 588 static void rsapub_pydealloc(PyObject *me)
 589 {
 590   rsa_pubdestroy(RSA_PUBCTX(me));
 591   rsa_pubfree(RSA_PUB(me));
 592   FREEOBJ(me);
 593 }
 594
 595 static PyObject *rsaget_n(PyObject *me, void *hunoz)
 596   { return mp_pywrap(MP_COPY(RSA_PUB(me)->n)); }
 597
 598 static PyObject *rsaget_e(PyObject *me, void *hunoz)
 599   { return mp_pywrap(MP_COPY(RSA_PUB(me)->e)); }
 600
 601 static PyObject *rsameth_pubop(PyObject *me, PyObject *arg)
 602 {
 603   mp *x = 0;
 604   PyObject *rc = 0;
 605
 606   if (!PyArg_ParseTuple(arg, "O&:pubop", convmp, &x)) goto end;
 607   rc = mp_pywrap(rsa_pubop(RSA_PUBCTX(me), MP_NEW, x));
 608 end:
 609   mp_drop(x);
 610   return (rc);
 611 }
 612
 613 static PyObject *rsapriv_dopywrap(PyTypeObject *ty,
 614                                   rsa_priv *rp, PyObject *rng)
 615 {
 616   rsapriv_pyobj *o;
 617
 618   o = (rsapriv_pyobj *)ty->tp_alloc(ty, 0);
 619   o->priv = *rp;
 620   o->pub.n = rp->n;
 621   o->pub.e = rp->e;
 622   rsa_privcreate(&o->privctx, &o->priv, &rand_global);
 623   rsa_pubcreate(&o->pubctx, &o->pub);
 624   if (!rng) {
 625     rng = Py_None;
 626     Py_INCREF(rng);
 627   }
 628   o->rng = rng;
 629   return ((PyObject *)o);
 630 }
 631
 632 PyObject *rsapriv_pywrap(rsa_priv *rp)
 633   { return rsapriv_dopywrap(rsapriv_pytype, rp, 0); }
 634
 635 static PyObject *rsapriv_pynew(PyTypeObject *ty,
 636                                PyObject *arg, PyObject *kw)
 637 {
 638   rsa_priv rp = { 0 };
 639   PyObject *rng = Py_None;
 640   static const char *const kwlist[] =
 641     { "n", "e", "d", "p", "q", "dp", "dq", "q_inv", "rng", 0 };
 642
 643   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&O&O&O&O&O&O&O&O:new", KWLIST,
 644                                    convmp, &rp.n, convmp, &rp.e,
 645                                    convmp, &rp.d,
 646                                    convmp, &rp.p, convmp, &rp.q,
 647                                    convmp, &rp.dp, convmp, &rp.dq,
 648                                    convmp, &rp.q_inv,
 649                                    &rng))
 650     goto end;
 651   if ((rp.n && !MP_ODDP(rp.n)) ||
 652       (rp.p && !MP_ODDP(rp.p)) ||
 653       (rp.q && !MP_ODDP(rp.q)))
 654     VALERR("RSA modulus and factors must be odd");
 655   if (rsa_recover(&rp)) VALERR("couldn't construct private key");
 656   if (rng != Py_None && !GRAND_PYCHECK(rng))
 657     TYERR("not a random number source");
 658   Py_INCREF(rng);
 659   return (rsapriv_dopywrap(ty, &rp, rng));
 660 end:
 661   rsa_privfree(&rp);
 662   return (0);
 663 }
 664
 665 static void rsapriv_pydealloc(PyObject *me)
 666 {
 667   RSA_PRIVCTX(me)->r = &rand_global;
 668   rsa_privdestroy(RSA_PRIVCTX(me));
 669   rsa_privfree(RSA_PRIV(me));
 670   Py_DECREF(RSA_RNG(me));
 671   FREEOBJ(me);
 672 }
 673
 674 static PyObject *rsaget_d(PyObject *me, void *hunoz)
 675   { return mp_pywrap(MP_COPY(RSA_PRIV(me)->d)); }
 676
 677 static PyObject *rsaget_p(PyObject *me, void *hunoz)
 678   { return mp_pywrap(MP_COPY(RSA_PRIV(me)->p)); }
 679
 680 static PyObject *rsaget_q(PyObject *me, void *hunoz)
 681   { return mp_pywrap(MP_COPY(RSA_PRIV(me)->q)); }
 682
 683 static PyObject *rsaget_dp(PyObject *me, void *hunoz)
 684   { return mp_pywrap(MP_COPY(RSA_PRIV(me)->dp)); }
 685
 686 static PyObject *rsaget_dq(PyObject *me, void *hunoz)
 687   { return mp_pywrap(MP_COPY(RSA_PRIV(me)->dq)); }
 688
 689 static PyObject *rsaget_q_inv(PyObject *me, void *hunoz)
 690   { return mp_pywrap(MP_COPY(RSA_PRIV(me)->q_inv)); }
 691
 692 static PyObject *rsaget_rng(PyObject *me, void *hunoz)
 693   { RETURN_OBJ(RSA_RNG(me)); }
 694
 695 static int rsaset_rng(PyObject *me, PyObject *val, void *hunoz)
 696 {
 697   int rc = -1;
 698   if (!val)
 699     val = Py_None;
 700   else if (val != Py_None && !GRAND_PYCHECK(val))
 701     TYERR("expected grand or None");
 702   Py_DECREF(RSA_RNG(me));
 703   RSA_RNG(me) = val;
 704   Py_INCREF(val);
 705   rc = 0;
 706 end:
 707   return (rc);
 708 }
 709
 710 static PyObject *rsameth_privop(PyObject *me, PyObject *arg, PyObject *kw)
 711 {
 712   PyObject *rng = RSA_RNG(me);
 713   mp *x = 0;
 714   PyObject *rc = 0;
 715   static const char *const kwlist[] = { "x", "rng", 0 };
 716
 717   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&|O:privop", KWLIST,
 718                                    convmp, &x, &rng))
 719     goto end;
 720   if (rng != Py_None && !GRAND_PYCHECK(rng))
 721     TYERR("not a random number source");
 722   RSA_PRIVCTX(me)->r = (rng == Py_None) ? 0 : GRAND_R(rng);
 723   rc = mp_pywrap(rsa_privop(RSA_PRIVCTX(me), MP_NEW, x));
 724 end:
 725   mp_drop(x);
 726   return (rc);
 727 }
 728
 729 static PyObject *meth__RSAPriv_generate(PyObject *me,
 730                                         PyObject *arg, PyObject *kw)
 731 {
 732   grand *r = &rand_global;
 733   unsigned nbits;
 734   unsigned n = 0;
 735   rsa_priv rp;
 736   mp *e = 0;
 737   struct excinfo exc = EXCINFO_INIT;
 738   pypgev evt = { { 0 } };
 739   static const char *const kwlist[] =
 740     { "class", "nbits", "event", "rng", "nsteps", "e", 0 };
 741   PyObject *rc = 0;
 742
 743   evt.exc = &exc;
 744   if (!PyArg_ParseTupleAndKeywords(arg, kw, "OO&|O&O&O&O&:generate", KWLIST,
 745                                    &me, convuint, &nbits, convpgev, &evt,
 746                                    convgrand, &r, convuint, &n,
 747                                    convmp, &e))
 748     goto end;
 749   if (e) MP_COPY(e);
 750   else e = mp_fromulong(MP_NEW, 65537);
 751   if (rsa_gen_e(&rp, nbits, e, r, n, evt.ev.proc, evt.ev.ctx))
 752     PGENERR(&exc);
 753   rc = rsapriv_pywrap(&rp);
 754 end:
 755   droppgev(&evt);
 756   mp_drop(e);
 757   return (rc);
 758 }
 759
 760 static PyGetSetDef rsapub_pygetset[] = {
 761 #define GETSETNAME(op, name) rsa##op##_##name
 762   GET   (n,             "R.n -> N")
 763   GET   (e,             "R.e -> E")
 764 #undef GETSETNAME
 765   { 0 }
 766 };
 767
 768 static PyMethodDef rsapub_pymethods[] = {
 769 #define METHNAME(name) rsameth_##name
 770   METH  (pubop,         "R.pubop(X) -> X^E (mod N)")
 771 #undef METHNAME
 772   { 0 }
 773 };
 774
 775 static PyGetSetDef rsapriv_pygetset[] = {
 776 #define GETSETNAME(op, name) rsa##op##_##name
 777   GET   (d,             "R.d -> D")
 778   GET   (p,             "R.p -> P")
 779   GET   (q,             "R.q -> Q")
 780   GET   (dp,            "R.dp -> D mod (P - 1)")
 781   GET   (dq,            "R.dq -> D mod (Q - 1)")
 782   GET   (q_inv,         "R.q_inv -> Q^{-1} mod P")
 783   GETSET(rng,           "R.rng -> random number source for blinding")
 784 #undef GETSETNAME
 785   { 0 }
 786 };
 787
 788 static PyMethodDef rsapriv_pymethods[] = {
 789 #define METHNAME(name) rsameth_##name
 790   KWMETH(privop,        "R.privop(X, [rng = None]) -> X^D (mod N)")
 791 #undef METHNAME
 792   { 0 }
 793 };
 794
 795 static PyTypeObject rsapub_pytype_skel = {
 796   PyObject_HEAD_INIT(0) 0,              /* Header */
 797   "RSAPub",                             /* @tp_name@ */
 798   sizeof(rsapub_pyobj),                 /* @tp_basicsize@ */
 799   0,                                    /* @tp_itemsize@ */
 800
 801   rsapub_pydealloc,                     /* @tp_dealloc@ */
 802   0,                                    /* @tp_print@ */
 803   0,                                    /* @tp_getattr@ */
 804   0,                                    /* @tp_setattr@ */
 805   0,                                    /* @tp_compare@ */
 806   0,                                    /* @tp_repr@ */
 807   0,                                    /* @tp_as_number@ */
 808   0,                                    /* @tp_as_sequence@ */
 809   0,                                    /* @tp_as_mapping@ */
 810   0,                                    /* @tp_hash@ */
 811   0,                                    /* @tp_call@ */
 812   0,                                    /* @tp_str@ */
 813   0,                                    /* @tp_getattro@ */
 814   0,                                    /* @tp_setattro@ */
 815   0,                                    /* @tp_as_buffer@ */
 816   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 817     Py_TPFLAGS_BASETYPE,
 818
 819   /* @tp_doc@ */
 820   "RSAPub(N, E): RSA public key.",
 821
 822   0,                                    /* @tp_traverse@ */
 823   0,                                    /* @tp_clear@ */
 824   0,                                    /* @tp_richcompare@ */
 825   0,                                    /* @tp_weaklistoffset@ */
 826   0,                                    /* @tp_iter@ */
 827   0,                                    /* @tp_iternext@ */
 828   rsapub_pymethods,                     /* @tp_methods@ */
 829   0,                                    /* @tp_members@ */
 830   rsapub_pygetset,                      /* @tp_getset@ */
 831   0,                                    /* @tp_base@ */
 832   0,                                    /* @tp_dict@ */
 833   0,                                    /* @tp_descr_get@ */
 834   0,                                    /* @tp_descr_set@ */
 835   0,                                    /* @tp_dictoffset@ */
 836   0,                                    /* @tp_init@ */
 837   PyType_GenericAlloc,                  /* @tp_alloc@ */
 838   rsapub_pynew,                         /* @tp_new@ */
 839   0,                                    /* @tp_free@ */
 840   0                                     /* @tp_is_gc@ */
 841 };
 842
 843 static PyTypeObject rsapriv_pytype_skel = {
 844   PyObject_HEAD_INIT(0) 0,              /* Header */
 845   "RSAPriv",                            /* @tp_name@ */
 846   sizeof(rsapriv_pyobj),                /* @tp_basicsize@ */
 847   0,                                    /* @tp_itemsize@ */
 848
 849   rsapriv_pydealloc,                    /* @tp_dealloc@ */
 850   0,                                    /* @tp_print@ */
 851   0,                                    /* @tp_getattr@ */
 852   0,                                    /* @tp_setattr@ */
 853   0,                                    /* @tp_compare@ */
 854   0,                                    /* @tp_repr@ */
 855   0,                                    /* @tp_as_number@ */
 856   0,                                    /* @tp_as_sequence@ */
 857   0,                                    /* @tp_as_mapping@ */
 858   0,                                    /* @tp_hash@ */
 859   0,                                    /* @tp_call@ */
 860   0,                                    /* @tp_str@ */
 861   0,                                    /* @tp_getattro@ */
 862   0,                                    /* @tp_setattro@ */
 863   0,                                    /* @tp_as_buffer@ */
 864   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 865     Py_TPFLAGS_BASETYPE,
 866
 867   /* @tp_doc@ */
 868   "RSAPriv(..., [rng = rand]): RSA private key.\n"
 869   "  Keywords: n, e, d, p, q, dp, dq, q_inv; must provide enough",
 870
 871   0,                                    /* @tp_traverse@ */
 872   0,                                    /* @tp_clear@ */
 873   0,                                    /* @tp_richcompare@ */
 874   0,                                    /* @tp_weaklistoffset@ */
 875   0,                                    /* @tp_iter@ */
 876   0,                                    /* @tp_iternext@ */
 877   rsapriv_pymethods,                    /* @tp_methods@ */
 878   0,                                    /* @tp_members@ */
 879   rsapriv_pygetset,                     /* @tp_getset@ */
 880   0,                                    /* @tp_base@ */
 881   0,                                    /* @tp_dict@ */
 882   0,                                    /* @tp_descr_get@ */
 883   0,                                    /* @tp_descr_set@ */
 884   0,                                    /* @tp_dictoffset@ */
 885   0,                                    /* @tp_init@ */
 886   PyType_GenericAlloc,                  /* @tp_alloc@ */
 887   rsapriv_pynew,                        /* @tp_new@ */
 888   0,                                    /* @tp_free@ */
 889   0                                     /* @tp_is_gc@ */
 890 };
 891
 892 /*----- RSA padding schemes -----------------------------------------------*/
 893
 894 static PyObject *meth__p1crypt_encode(PyObject *me,
 895                                       PyObject *arg, PyObject *kw)
 896 {
 897   pkcs1 p1;
 898   char *m, *ep;
 899   Py_ssize_t msz, epsz;
 900   unsigned long nbits;
 901   PyObject *rc = 0;
 902   octet *b = 0;
 903   size_t sz;
 904   mp *x;
 905   static const char *const kwlist[] = { "msg", "nbits", "ep", "rng", 0 };
 906
 907   p1.r = &rand_global; ep = 0; epsz = 0;
 908   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&|s#O&:encode", KWLIST,
 909                                    &m, &msz, convulong, &nbits,
 910                                    &ep, &epsz, convgrand, &p1.r))
 911     goto end;
 912   sz = (nbits + 7)/8;
 913   p1.ep = ep; p1.epsz = epsz;
 914   if (epsz + msz + 11 > sz) VALERR("buffer underflow");
 915   b = xmalloc(sz);
 916   x = pkcs1_cryptencode(MP_NEW, m, msz, b, sz, nbits, &p1);
 917   rc = mp_pywrap(x);
 918 end:
 919   xfree(b);
 920   return (rc);
 921 }
 922
 923 static PyObject *meth__p1crypt_decode(PyObject *me,
 924                                       PyObject *arg, PyObject *kw)
 925 {
 926   pkcs1 p1;
 927   char *ep;
 928   Py_ssize_t epsz;
 929   unsigned long nbits;
 930   int n;
 931   PyObject *rc = 0;
 932   octet *b = 0;
 933   size_t sz;
 934   mp *x = 0;
 935   static const char *const kwlist[] = { "ct", "nbits", "ep", "rng", 0 };
 936
 937   p1.r = &rand_global; ep = 0; epsz = 0;
 938   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&O&|s#O&:decode", KWLIST,
 939                                    convmp, &x, convulong, &nbits,
 940                                    &ep, &epsz, convgrand, &p1.r))
 941     goto end;
 942   sz = (nbits + 7)/8;
 943   p1.ep = ep; p1.epsz = epsz;
 944   if (epsz + 11 > sz) VALERR("buffer underflow");
 945   b = xmalloc(sz);
 946   if ((n = pkcs1_cryptdecode(x, b, sz, nbits, &p1)) < 0)
 947     VALERR("decryption failed");
 948   rc = bytestring_pywrap(b, n);
 949 end:
 950   mp_drop(x);
 951   xfree(b);
 952   return (rc);
 953 }
 954
 955 static PyObject *meth__p1sig_encode(PyObject *me,
 956                                     PyObject *arg, PyObject *kw)
 957 {
 958   pkcs1 p1;
 959   char *m, *ep;
 960   Py_ssize_t msz, epsz;
 961   unsigned long nbits;
 962   PyObject *rc = 0;
 963   octet *b = 0;
 964   size_t sz;
 965   mp *x;
 966   static const char *const kwlist[] = { "msg", "nbits", "ep", "rng", 0 };
 967
 968   p1.r = &rand_global; ep = 0; epsz = 0;
 969   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&|s#O&:encode", KWLIST,
 970                                    &m, &msz, convulong, &nbits,
 971                                    &ep, &epsz, convgrand, &p1.r))
 972     goto end;
 973   sz = (nbits + 7)/8;
 974   p1.ep = ep; p1.epsz = epsz;
 975   if (epsz + msz + 11 > sz) VALERR("buffer underflow");
 976   b = xmalloc(sz);
 977   x = pkcs1_sigencode(MP_NEW, m, msz, b, sz, nbits, &p1);
 978   rc = mp_pywrap(x);
 979 end:
 980   xfree(b);
 981   return (rc);
 982 }
 983
 984 static PyObject *meth__p1sig_decode(PyObject *me,
 985                                     PyObject *arg, PyObject *kw)
 986 {
 987   pkcs1 p1;
 988   char *ep;
 989   Py_ssize_t epsz;
 990   unsigned long nbits;
 991   int n;
 992   PyObject *hukairz;
 993   PyObject *rc = 0;
 994   octet *b = 0;
 995   size_t sz;
 996   mp *x = 0;
 997   static const char *const kwlist[] =
 998     { "msg", "sig", "nbits", "ep", "rng", 0 };
 999
1000   p1.r = &rand_global; ep = 0; epsz = 0;
1001   if (!PyArg_ParseTupleAndKeywords(arg, kw, "OO&O&|s#O&:decode", KWLIST,
1002                                    &hukairz, convmp, &x, convulong, &nbits,
1003                                    &ep, &epsz, convgrand, &p1.r))
1004     goto end;
1005   sz = (nbits + 7)/8;
1006   p1.ep = ep; p1.epsz = epsz;
1007   if (epsz + 10 > sz) VALERR("buffer underflow");
1008   b = xmalloc(sz);
1009   if ((n = pkcs1_sigdecode(x, 0, 0, b, sz, nbits, &p1)) < 0)
1010     VALERR("verification failed");
1011   rc = bytestring_pywrap(b, n);
1012 end:
1013   mp_drop(x);
1014   xfree(b);
1015   return (rc);
1016 }
1017
1018 static PyObject *meth__oaep_encode(PyObject *me,
1019                                    PyObject *arg, PyObject *kw)
1020 {
1021   oaep o;
1022   char *m, *ep;
1023   Py_ssize_t msz, epsz;
1024   unsigned long nbits;
1025   PyObject *rc = 0;
1026   octet *b = 0;
1027   size_t sz;
1028   mp *x;
1029   static const char *const kwlist[] =
1030     { "msg", "nbits", "mgf", "hash", "ep", "rng", 0 };
1031
1032   o.r = &rand_global; o.cc = &sha_mgf; o.ch = &sha; ep = 0; epsz = 0;
1033   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&|O&O&s#O&:encode", KWLIST,
1034                                    &m, &msz, convulong, &nbits,
1035                                    convgccipher, &o.cc,
1036                                    convgchash, &o.ch,
1037                                    &ep, &epsz,
1038                                    convgrand, &o.r))
1039     goto end;
1040   sz = (nbits + 7)/8;
1041   o.ep = ep; o.epsz = epsz;
1042   if (2 * o.ch->hashsz + 2 + msz > sz) VALERR("buffer underflow");
1043   b = xmalloc(sz);
1044   x = oaep_encode(MP_NEW, m, msz, b, sz, nbits, &o);
1045   rc = mp_pywrap(x);
1046 end:
1047   xfree(b);
1048   return (rc);
1049 }
1050
1051 static PyObject *meth__oaep_decode(PyObject *me,
1052                                    PyObject *arg, PyObject *kw)
1053 {
1054   oaep o;
1055   char *ep;
1056   Py_ssize_t epsz;
1057   unsigned long nbits;
1058   int n;
1059   PyObject *rc = 0;
1060   octet *b = 0;
1061   size_t sz;
1062   mp *x = 0;
1063   static const char *const kwlist[] =
1064     { "ct", "nbits", "mgf", "hash", "ep", "rng", 0 };
1065
1066   o.r = &rand_global; o.cc = &sha_mgf; o.ch = &sha; ep = 0; epsz = 0;
1067   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&O&|O&O&s#O&:decode", KWLIST,
1068                                    convmp, &x, convulong, &nbits,
1069                                    convgccipher, &o.cc,
1070                                    convgchash, &o.ch,
1071                                    &ep, &epsz,
1072                                    convgrand, &o.r))
1073     goto end;
1074   sz = (nbits + 7)/8;
1075   o.ep = ep; o.epsz = epsz;
1076   if (2 * o.ch->hashsz > sz) VALERR("buffer underflow");
1077   b = xmalloc(sz);
1078   if ((n = oaep_decode(x, b, sz, nbits, &o)) < 0)
1079     VALERR("decryption failed");
1080   rc = bytestring_pywrap(b, n);
1081 end:
1082   mp_drop(x);
1083   xfree(b);
1084   return (rc);
1085 }
1086
1087 static PyObject *meth__pss_encode(PyObject *me,
1088                                   PyObject *arg, PyObject *kw)
1089 {
1090   pss p;
1091   char *m;
1092   Py_ssize_t msz;
1093   unsigned long nbits;
1094   PyObject *rc = 0;
1095   octet *b = 0;
1096   size_t sz;
1097   mp *x = 0;
1098   static const char *const kwlist[] =
1099     { "msg", "nbits", "mgf", "hash", "saltsz", "rng", 0 };
1100
1101   p.cc = &sha_mgf; p.ch = &sha; p.r = &rand_global; p.ssz = (size_t)-1;
1102   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&|O&O&O&O&:encode", KWLIST,
1103                                    &m, &msz, convulong, &nbits,
1104                                    convgccipher, &p.cc,
1105                                    convgchash, &p.ch,
1106                                    convszt, &p.ssz,
1107                                    convgrand, &p.r))
1108     goto end;
1109   sz = (nbits + 7)/8;
1110   if (p.ssz == (size_t)-1) p.ssz = p.ch->hashsz;
1111   if (p.ch->hashsz + p.ssz + 2 > sz) VALERR("buffer underflow");
1112   b = xmalloc(sz);
1113   x = pss_encode(MP_NEW, m, msz, b, sz, nbits, &p);
1114   rc = mp_pywrap(x);
1115 end:
1116   xfree(b);
1117   return (rc);
1118 }
1119
1120 static PyObject *meth__pss_decode(PyObject *me,
1121                                   PyObject *arg, PyObject *kw)
1122 {
1123   pss p;
1124   char *m;
1125   Py_ssize_t msz;
1126   unsigned long nbits;
1127   PyObject *rc = 0;
1128   octet *b = 0;
1129   size_t sz;
1130   int n;
1131   mp *x = 0;
1132   static const char *const kwlist[] =
1133     { "msg", "sig", "nbits", "mgf", "hash", "saltsz", "rng", 0 };
1134
1135   p.cc = &sha_mgf; p.ch = &sha; p.r = &rand_global; p.ssz = (size_t)-1;
1136   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&O&|O&O&O&O&:decode", KWLIST,
1137                                    &m, &msz, convmp, &x, convulong, &nbits,
1138                                    convgccipher, &p.cc,
1139                                    convgchash, &p.ch,
1140                                    convszt, &p.ssz,
1141                                    convgrand, &p.r))
1142     goto end;
1143   sz = (nbits + 7)/8;
1144   if (p.ssz == (size_t)-1) p.ssz = p.ch->hashsz;
1145   if (p.ch->hashsz + p.ssz + 2 > sz) VALERR("buffer underflow");
1146   b = xmalloc(sz);
1147   if ((n = pss_decode(x, m, msz, b, sz, nbits, &p)) < 0)
1148     VALERR("verification failed");
1149   rc = Py_None; Py_INCREF(rc);
1150 end:
1151   mp_drop(x);
1152   xfree(b);
1153   return (rc);
1154 }
1155
1156 /*----- X25519 and related algorithms -------------------------------------*/
1157
1158 #define XDHS(_)                                                         \
1159   _(X25519, x25519)                                                     \
1160   _(X448, x448)
1161
1162 #define DEFXDH(X, x)                                                    \
1163   static PyObject *meth_##x(PyObject *me, PyObject *arg)                \
1164   {                                                                     \
1165     const char *k, *p;                                                  \
1166     Py_ssize_t ksz, psz;                                                \
1167     PyObject *rc = 0;                                                   \
1168     if (!PyArg_ParseTuple(arg, "s#s#:" #x, &k, &ksz, &p, &psz))         \
1169       goto end;                                                         \
1170     if (ksz != X##_KEYSZ) VALERR("bad key length");                     \
1171     if (psz != X##_PUBSZ) VALERR("bad public length");                  \
1172     rc = bytestring_pywrap(0, X##_OUTSZ);                               \
1173     x((octet *)PyString_AS_STRING(rc),                                  \
1174       (const octet *)k, (const octet *)p);                              \
1175     return (rc);                                                        \
1176   end:                                                                  \
1177     return (0);                                                         \
1178   }
1179 XDHS(DEFXDH)
1180 #undef DEFXDH
1181
1182 /*----- Ed25519 and related algorithms ------------------------------------*/
1183
1184 #define EDDSAS(_)                                                       \
1185   _(ED25519, ed25519, -1, ctx)                                          \
1186   _(ED448, ed448, 0, )
1187
1188 #define DEFEDDSA(ED, ed, phdflt, sigver)                                \
1189                                                                         \
1190   static PyObject *meth_##ed##_pubkey(PyObject *me, PyObject *arg)      \
1191   {                                                                     \
1192     const char *k;                                                      \
1193     Py_ssize_t ksz;                                                     \
1194     PyObject *rc = 0;                                                   \
1195     if (!PyArg_ParseTuple(arg, "s#:" #ed "_pubkey", &k, &ksz))          \
1196       goto end;                                                         \
1197     rc = bytestring_pywrap(0, ED##_PUBSZ);                              \
1198     ed##_pubkey((octet *)PyString_AS_STRING(rc), k, ksz);               \
1199     return (rc);                                                        \
1200   end:                                                                  \
1201     return (0);                                                         \
1202   }                                                                     \
1203                                                                         \
1204   static PyObject *meth_##ed##_sign(PyObject *me, PyObject *arg,        \
1205                                     PyObject *kw)                       \
1206   {                                                                     \
1207     const char *k, *p = 0, *c = 0, *m;                                  \
1208     Py_ssize_t ksz, psz, csz = 0, msz;                                  \
1209     int ph = phdflt;                                                    \
1210     PyObject *rc = 0;                                                   \
1211     octet pp[ED##_PUBSZ];                                               \
1212     static const char *const kwlist[] =                                 \
1213       { "key", "msg", "pub", "perso", "phflag", 0 };                    \
1214     if (!PyArg_ParseTupleAndKeywords(arg, kw,                           \
1215                                      "s#s#|s#s#O&:" #ed "_sign",        \
1216                                      KWLIST,                            \
1217                                      &k, &ksz, &m, &msz, &p, &psz,      \
1218                                      &c, &csz, convbool, &ph))          \
1219       goto end;                                                         \
1220     if (p && psz != ED##_PUBSZ) VALERR("bad public length");            \
1221     if (c && csz > ED##_MAXPERSOSZ)                                     \
1222       VALERR("personalization string too long");                        \
1223     if (c && ph == -1) ph = 0;                                          \
1224     if (!p) { p = (const char *)pp; ed##_pubkey(pp, k, ksz); }          \
1225     rc = bytestring_pywrap(0, ED##_SIGSZ);                              \
1226     ed##sigver##_sign((octet *)PyString_AS_STRING(rc), k, ksz,          \
1227                       (const octet *)p, ph, c, csz, m, msz);            \
1228     return (rc);                                                        \
1229   end:                                                                  \
1230     return (0);                                                         \
1231   }                                                                     \
1232                                                                         \
1233   static PyObject *meth_##ed##_verify(PyObject *me,                     \
1234                                       PyObject *arg, PyObject *kw)      \
1235   {                                                                     \
1236     const char *p, *c = 0, *m, *s;                                      \
1237     Py_ssize_t psz, csz = 0, msz, ssz;                                  \
1238     int ph = phdflt;                                                    \
1239     PyObject *rc = 0;                                                   \
1240     static const char *const kwlist[] =                                 \
1241       { "pub", "msg", "sig", "perso", "phflag", 0 };                    \
1242     if (!PyArg_ParseTupleAndKeywords(arg, kw,                           \
1243                                      "s#s#s#|s#O&:" #ed "_verify",      \
1244                                      KWLIST,                            \
1245                                      &p, &psz, &m, &msz, &s, &ssz,      \
1246                                      &c, &csz, convbool, &ph))          \
1247       goto end;                                                         \
1248     if (psz != ED##_PUBSZ) VALERR("bad public length");                 \
1249     if (ssz != ED##_SIGSZ) VALERR("bad signature length");              \
1250     if (c && csz > ED##_MAXPERSOSZ)                                     \
1251       VALERR("personalization string too long");                        \
1252     if (c && ph == -1) ph = 0;                                          \
1253     rc = getbool(!ed##sigver##_verify((const octet *)p, ph, c, csz,     \
1254                                       m, msz, (const octet *)s));       \
1255     return (rc);                                                        \
1256   end:                                                                  \
1257     return (0);                                                         \
1258   }
1259 EDDSAS(DEFEDDSA)
1260 #undef DEFEDDSA
1261
1262 /*----- Global stuff ------------------------------------------------------*/
1263
1264 static PyMethodDef methods[] = {
1265 #define METHNAME(name) meth_##name
1266   KWMETH(_p1crypt_encode, 0)
1267   KWMETH(_p1crypt_decode, 0)
1268   KWMETH(_p1sig_encode, 0)
1269   KWMETH(_p1sig_decode, 0)
1270   KWMETH(_oaep_encode,  0)
1271   KWMETH(_oaep_decode,  0)
1272   KWMETH(_pss_encode,   0)
1273   KWMETH(_pss_decode,   0)
1274   KWMETH(_RSAPriv_generate, "generate(NBITS, [event = pgen_nullev], "
1275                                           "[rng = rand], [nsteps = 0]) -> R")
1276 #define DEFMETH(X, x)                                                   \
1277   METH  (x,             "" #x "(KEY, PUBLIC) -> SHARED")
1278   XDHS(DEFMETH)
1279 #undef DEFMETH
1280 #define DEFMETH(ED, ed, phdflt, sigver)                                 \
1281   METH  (ed##_pubkey,   "" #ed "_pubkey(KEY) -> PUBLIC")                \
1282   KWMETH(ed##_sign,     "" #ed "_sign(KEY, MSG, [pub = PUBLIC], "       \
1283                            "[perso = STRING], [phflag = BOOL]) -> SIG") \
1284   KWMETH(ed##_verify,   "" #ed "_verify(PUBLIC, MSG, SIG, "             \
1285                           "[perso = STRING], [phflag = BOOL]) -> BOOL")
1286   EDDSAS(DEFMETH)
1287 #undef DEFMETH
1288 #undef METHNAME
1289   { 0 }
1290 };
1291
1292 void pubkey_pyinit(void)
1293 {
1294   INITTYPE(dsapub, root);
1295   INITTYPE(dsapriv, dsapub);
1296   INITTYPE(kcdsapub, root);
1297   INITTYPE(kcdsapriv, kcdsapub);
1298   INITTYPE(rsapub, root);
1299   INITTYPE(rsapriv, rsapub);
1300   addmethods(methods);
1301 }
1302
1303 void pubkey_pyinsert(PyObject *mod)
1304 {
1305   INSERT("DSAPub", dsapub_pytype);
1306   INSERT("DSAPriv", dsapriv_pytype);
1307   INSERT("KCDSAPub", kcdsapub_pytype);
1308   INSERT("KCDSAPriv", kcdsapriv_pytype);
1309   INSERT("RSAPub", rsapub_pytype);
1310   INSERT("RSAPriv", rsapriv_pytype);
1311 }
1312
1313 /*----- That's all, folks -------------------------------------------------*/