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