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