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", "p", "u", "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   pgev evt = { 0 };
 732   char *kwlist[] = { "class", "nbits", "event", "rng", "nsteps", 0 };
 733   PyObject *rc = 0;
 734
 735   if (!PyArg_ParseTupleAndKeywords(arg, kw, "OO&|O&O&O&:generate", kwlist,
 736                                    &me, convuint, &nbits, convpgev, &evt,
 737                                    convgrand, &r, convuint, &n))
 738     goto end;
 739   if (rsa_gen(&rp, nbits, r, n, evt.proc, evt.ctx))
 740     PGENERR;
 741   rc = rsapriv_pywrap(&rp);
 742 end:
 743   droppgev(&evt);
 744   return (rc);
 745 }
 746
 747 static PyGetSetDef rsapub_pygetset[] = {
 748 #define GETSETNAME(op, name) rsa##op##_##name
 749   GET   (n,                     "R.n -> N")
 750   GET   (e,                     "R.e -> E")
 751 #undef GETSETNAME
 752   { 0 }
 753 };
 754
 755 static PyMethodDef rsapub_pymethods[] = {
 756 #define METHNAME(name) rsameth_##name
 757   METH  (pubop,                 "R.pubop(X) -> X^E (mod N)")
 758 #undef METHNAME
 759   { 0 }
 760 };
 761
 762 static PyGetSetDef rsapriv_pygetset[] = {
 763 #define GETSETNAME(op, name) rsa##op##_##name
 764   GET   (d,                     "R.d -> D")
 765   GET   (p,                     "R.p -> P")
 766   GET   (q,                     "R.q -> Q")
 767   GET   (dp,                    "R.dp -> D mod (P - 1)")
 768   GET   (dq,                    "R.dq -> D mod (Q - 1)")
 769   GET   (q_inv,                 "R.q_inv -> Q^{-1} mod P")
 770   GETSET(rng,                   "R.rng -> random number source for blinding")
 771 #undef GETSETNAME
 772   { 0 }
 773 };
 774
 775 static PyMethodDef rsapriv_pymethods[] = {
 776 #define METHNAME(name) rsameth_##name
 777   KWMETH(privop,                "R.privop(X, rng = None) -> X^D (mod N)")
 778 #undef METHNAME
 779   { 0 }
 780 };
 781
 782 static PyTypeObject rsapub_pytype_skel = {
 783   PyObject_HEAD_INIT(0) 0,              /* Header */
 784   "RSAPub",                             /* @tp_name@ */
 785   sizeof(rsapub_pyobj),                 /* @tp_basicsize@ */
 786   0,                                    /* @tp_itemsize@ */
 787
 788   rsapub_pydealloc,                     /* @tp_dealloc@ */
 789   0,                                    /* @tp_print@ */
 790   0,                                    /* @tp_getattr@ */
 791   0,                                    /* @tp_setattr@ */
 792   0,                                    /* @tp_compare@ */
 793   0,                                    /* @tp_repr@ */
 794   0,                                    /* @tp_as_number@ */
 795   0,                                    /* @tp_as_sequence@ */
 796   0,                                    /* @tp_as_mapping@ */
 797   0,                                    /* @tp_hash@ */
 798   0,                                    /* @tp_call@ */
 799   0,                                    /* @tp_str@ */
 800   0,                                    /* @tp_getattro@ */
 801   0,                                    /* @tp_setattro@ */
 802   0,                                    /* @tp_as_buffer@ */
 803   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 804     Py_TPFLAGS_BASETYPE,
 805
 806   /* @tp_doc@ */
 807 "RSA public key information.",
 808
 809   0,                                    /* @tp_traverse@ */
 810   0,                                    /* @tp_clear@ */
 811   0,                                    /* @tp_richcompare@ */
 812   0,                                    /* @tp_weaklistoffset@ */
 813   0,                                    /* @tp_iter@ */
 814   0,                                    /* @tp_iternext@ */
 815   rsapub_pymethods,                     /* @tp_methods@ */
 816   0,                                    /* @tp_members@ */
 817   rsapub_pygetset,                      /* @tp_getset@ */
 818   0,                                    /* @tp_base@ */
 819   0,                                    /* @tp_dict@ */
 820   0,                                    /* @tp_descr_get@ */
 821   0,                                    /* @tp_descr_set@ */
 822   0,                                    /* @tp_dictoffset@ */
 823   0,                                    /* @tp_init@ */
 824   PyType_GenericAlloc,                  /* @tp_alloc@ */
 825   rsapub_pynew,                         /* @tp_new@ */
 826   0,                                    /* @tp_free@ */
 827   0                                     /* @tp_is_gc@ */
 828 };
 829
 830 static PyTypeObject rsapriv_pytype_skel = {
 831   PyObject_HEAD_INIT(0) 0,              /* Header */
 832   "RSAPriv",                            /* @tp_name@ */
 833   sizeof(rsapriv_pyobj),                /* @tp_basicsize@ */
 834   0,                                    /* @tp_itemsize@ */
 835
 836   rsapriv_pydealloc,                    /* @tp_dealloc@ */
 837   0,                                    /* @tp_print@ */
 838   0,                                    /* @tp_getattr@ */
 839   0,                                    /* @tp_setattr@ */
 840   0,                                    /* @tp_compare@ */
 841   0,                                    /* @tp_repr@ */
 842   0,                                    /* @tp_as_number@ */
 843   0,                                    /* @tp_as_sequence@ */
 844   0,                                    /* @tp_as_mapping@ */
 845   0,                                    /* @tp_hash@ */
 846   0,                                    /* @tp_call@ */
 847   0,                                    /* @tp_str@ */
 848   0,                                    /* @tp_getattro@ */
 849   0,                                    /* @tp_setattro@ */
 850   0,                                    /* @tp_as_buffer@ */
 851   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 852     Py_TPFLAGS_BASETYPE,
 853
 854   /* @tp_doc@ */
 855 "RSA private key information.",
 856
 857   0,                                    /* @tp_traverse@ */
 858   0,                                    /* @tp_clear@ */
 859   0,                                    /* @tp_richcompare@ */
 860   0,                                    /* @tp_weaklistoffset@ */
 861   0,                                    /* @tp_iter@ */
 862   0,                                    /* @tp_iternext@ */
 863   rsapriv_pymethods,                    /* @tp_methods@ */
 864   0,                                    /* @tp_members@ */
 865   rsapriv_pygetset,                     /* @tp_getset@ */
 866   0,                                    /* @tp_base@ */
 867   0,                                    /* @tp_dict@ */
 868   0,                                    /* @tp_descr_get@ */
 869   0,                                    /* @tp_descr_set@ */
 870   0,                                    /* @tp_dictoffset@ */
 871   0,                                    /* @tp_init@ */
 872   PyType_GenericAlloc,                  /* @tp_alloc@ */
 873   rsapriv_pynew,                        /* @tp_new@ */
 874   0,                                    /* @tp_free@ */
 875   0                                     /* @tp_is_gc@ */
 876 };
 877
 878 /*----- RSA padding schemes -----------------------------------------------*/
 879
 880 static PyObject *meth__p1crypt_encode(PyObject *me,
 881                                       PyObject *arg, PyObject *kw)
 882 {
 883   pkcs1 p1;
 884   char *m, *ep;
 885   Py_ssize_t msz, epsz;
 886   unsigned long nbits;
 887   PyObject *rc = 0;
 888   octet *b = 0;
 889   size_t sz;
 890   mp *x;
 891   char *kwlist[] = { "msg", "nbits", "ep", "rng", 0 };
 892
 893   p1.r = &rand_global; ep = 0; epsz = 0;
 894   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&|s#O&:encode", kwlist,
 895                                    &m, &msz, convulong, &nbits,
 896                                    &ep, &epsz, convgrand, &p1.r))
 897     goto end;
 898   sz = (nbits + 7)/8;
 899   p1.ep = ep; p1.epsz = epsz;
 900   if (epsz + msz + 11 > sz) VALERR("buffer underflow");
 901   b = xmalloc(sz);
 902   x = pkcs1_cryptencode(MP_NEW, m, msz, b, sz, nbits, &p1);
 903   rc = mp_pywrap(x);
 904 end:
 905   xfree(b);
 906   return (rc);
 907 }
 908
 909 static PyObject *meth__p1crypt_decode(PyObject *me,
 910                                       PyObject *arg, PyObject *kw)
 911 {
 912   pkcs1 p1;
 913   char *ep;
 914   Py_ssize_t epsz;
 915   unsigned long nbits;
 916   int n;
 917   PyObject *rc = 0;
 918   octet *b = 0;
 919   size_t sz;
 920   mp *x = 0;
 921   char *kwlist[] = { "ct", "nbits", "ep", "rng", 0 };
 922
 923   p1.r = &rand_global; ep = 0; epsz = 0;
 924   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&O&|s#O&:decode", kwlist,
 925                                    convmp, &x, convulong, &nbits,
 926                                    &ep, &epsz, convgrand, &p1.r))
 927     goto end;
 928   sz = (nbits + 7)/8;
 929   p1.ep = ep; p1.epsz = epsz;
 930   if (epsz + 11 > sz) VALERR("buffer underflow");
 931   b = xmalloc(sz);
 932   if ((n = pkcs1_cryptdecode(x, b, sz, nbits, &p1)) < 0)
 933     VALERR("decryption failed");
 934   rc = bytestring_pywrap(b, n);
 935 end:
 936   mp_drop(x);
 937   xfree(b);
 938   return (rc);
 939 }
 940
 941 static PyObject *meth__p1sig_encode(PyObject *me,
 942                                     PyObject *arg, PyObject *kw)
 943 {
 944   pkcs1 p1;
 945   char *m, *ep;
 946   Py_ssize_t msz, epsz;
 947   unsigned long nbits;
 948   PyObject *rc = 0;
 949   octet *b = 0;
 950   size_t sz;
 951   mp *x;
 952   char *kwlist[] = { "msg", "nbits", "ep", "rng", 0 };
 953
 954   p1.r = &rand_global; ep = 0; epsz = 0;
 955   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&|s#O&:encode", kwlist,
 956                                    &m, &msz, convulong, &nbits,
 957                                    &ep, &epsz, convgrand, &p1.r))
 958     goto end;
 959   sz = (nbits + 7)/8;
 960   p1.ep = ep; p1.epsz = epsz;
 961   if (epsz + msz + 11 > sz) VALERR("buffer underflow");
 962   b = xmalloc(sz);
 963   x = pkcs1_sigencode(MP_NEW, m, msz, b, sz, nbits, &p1);
 964   rc = mp_pywrap(x);
 965 end:
 966   xfree(b);
 967   return (rc);
 968 }
 969
 970 static PyObject *meth__p1sig_decode(PyObject *me,
 971                                     PyObject *arg, PyObject *kw)
 972 {
 973   pkcs1 p1;
 974   char *ep;
 975   Py_ssize_t epsz;
 976   unsigned long nbits;
 977   int n;
 978   PyObject *hukairz;
 979   PyObject *rc = 0;
 980   octet *b = 0;
 981   size_t sz;
 982   mp *x = 0;
 983   char *kwlist[] = { "msg", "sig", "nbits", "ep", "rng", 0 };
 984
 985   p1.r = &rand_global; ep = 0; epsz = 0;
 986   if (!PyArg_ParseTupleAndKeywords(arg, kw, "OO&O&|s#O&:decode", kwlist,
 987                                    &hukairz, convmp, &x, convulong, &nbits,
 988                                    &ep, &epsz, convgrand, &p1.r))
 989     goto end;
 990   sz = (nbits + 7)/8;
 991   p1.ep = ep; p1.epsz = epsz;
 992   if (epsz + 10 > sz) VALERR("buffer underflow");
 993   b = xmalloc(sz);
 994   if ((n = pkcs1_sigdecode(x, 0, 0, b, sz, nbits, &p1)) < 0)
 995     VALERR("verification failed");
 996   rc = bytestring_pywrap(b, n);
 997 end:
 998   mp_drop(x);
 999   xfree(b);
1000   return (rc);
1001 }
1002
1003 static PyObject *meth__oaep_encode(PyObject *me,
1004                                    PyObject *arg, PyObject *kw)
1005 {
1006   oaep o;
1007   char *m, *ep;
1008   Py_ssize_t msz, epsz;
1009   unsigned long nbits;
1010   PyObject *rc = 0;
1011   octet *b = 0;
1012   size_t sz;
1013   mp *x;
1014   char *kwlist[] = { "msg", "nbits", "mgf", "hash", "ep", "rng", 0 };
1015
1016   o.r = &rand_global; o.cc = &sha_mgf; o.ch = &sha; ep = 0; epsz = 0;
1017   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&|O&O&s#O&:encode", kwlist,
1018                                    &m, &msz, convulong, &nbits,
1019                                    convgccipher, &o.cc,
1020                                    convgchash, &o.ch,
1021                                    &ep, &epsz,
1022                                    convgrand, &o.r))
1023     goto end;
1024   sz = (nbits + 7)/8;
1025   o.ep = ep; o.epsz = epsz;
1026   if (2 * o.ch->hashsz + 2 + msz > sz) VALERR("buffer underflow");
1027   b = xmalloc(sz);
1028   x = oaep_encode(MP_NEW, m, msz, b, sz, nbits, &o);
1029   rc = mp_pywrap(x);
1030 end:
1031   xfree(b);
1032   return (rc);
1033 }
1034
1035 static PyObject *meth__oaep_decode(PyObject *me,
1036                                    PyObject *arg, PyObject *kw)
1037 {
1038   oaep o;
1039   char *ep;
1040   Py_ssize_t epsz;
1041   unsigned long nbits;
1042   int n;
1043   PyObject *rc = 0;
1044   octet *b = 0;
1045   size_t sz;
1046   mp *x = 0;
1047   char *kwlist[] = { "ct", "nbits", "mgf", "hash", "ep", "rng", 0 };
1048
1049   o.r = &rand_global; o.cc = &sha_mgf; o.ch = &sha; ep = 0; epsz = 0;
1050   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&O&|O&O&s#O&:decode", kwlist,
1051                                    convmp, &x, convulong, &nbits,
1052                                    convgccipher, &o.cc,
1053                                    convgchash, &o.ch,
1054                                    &ep, &epsz,
1055                                    convgrand, &o.r))
1056     goto end;
1057   sz = (nbits + 7)/8;
1058   o.ep = ep; o.epsz = epsz;
1059   if (2 * o.ch->hashsz > sz) VALERR("buffer underflow");
1060   b = xmalloc(sz);
1061   if ((n = oaep_decode(x, b, sz, nbits, &o)) < 0)
1062     VALERR("decryption failed");
1063   rc = bytestring_pywrap(b, n);
1064 end:
1065   mp_drop(x);
1066   xfree(b);
1067   return (rc);
1068 }
1069
1070 static PyObject *meth__pss_encode(PyObject *me,
1071                                   PyObject *arg, PyObject *kw)
1072 {
1073   pss p;
1074   char *m;
1075   Py_ssize_t msz;
1076   unsigned long nbits;
1077   PyObject *rc = 0;
1078   octet *b = 0;
1079   size_t sz;
1080   mp *x = 0;
1081   char *kwlist[] = { "msg", "nbits", "mgf", "hash", "saltsz", "rng", 0 };
1082
1083   p.cc = &sha_mgf; p.ch = &sha; p.r = &rand_global; p.ssz = (size_t)-1;
1084   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&|O&O&O&O&:encode", kwlist,
1085                                    &m, &msz, convulong, &nbits,
1086                                    convgccipher, &p.cc,
1087                                    convgchash, &p.ch,
1088                                    convszt, &p.ssz,
1089                                    convgrand, &p.r))
1090     goto end;
1091   sz = (nbits + 7)/8;
1092   if (p.ssz == (size_t)-1) p.ssz = p.ch->hashsz;
1093   if (p.ch->hashsz + p.ssz + 2 > sz) VALERR("buffer underflow");
1094   b = xmalloc(sz);
1095   x = pss_encode(MP_NEW, m, msz, b, sz, nbits, &p);
1096   rc = mp_pywrap(x);
1097 end:
1098   xfree(b);
1099   return (rc);
1100 }
1101
1102 static PyObject *meth__pss_decode(PyObject *me,
1103                                   PyObject *arg, PyObject *kw)
1104 {
1105   pss p;
1106   char *m;
1107   Py_ssize_t msz;
1108   unsigned long nbits;
1109   PyObject *rc = 0;
1110   octet *b = 0;
1111   size_t sz;
1112   int n;
1113   mp *x = 0;
1114   char *kwlist[] =
1115     { "msg", "sig", "nbits", "mgf", "hash", "saltsz", "rng", 0 };
1116
1117   p.cc = &sha_mgf; p.ch = &sha; p.r = &rand_global; p.ssz = (size_t)-1;
1118   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&O&|O&O&O&O&:decode", kwlist,
1119                                    &m, &msz, convmp, &x, convulong, &nbits,
1120                                    convgccipher, &p.cc,
1121                                    convgchash, &p.ch,
1122                                    convszt, &p.ssz,
1123                                    convgrand, &p.r))
1124     goto end;
1125   sz = (nbits + 7)/8;
1126   if (p.ssz == (size_t)-1) p.ssz = p.ch->hashsz;
1127   if (p.ch->hashsz + p.ssz + 2 > sz) VALERR("buffer underflow");
1128   b = xmalloc(sz);
1129   if ((n = pss_decode(x, m, msz, b, sz, nbits, &p)) < 0)
1130     VALERR("verification failed");
1131   rc = Py_None; Py_INCREF(rc);
1132 end:
1133   mp_drop(x);
1134   xfree(b);
1135   return (rc);
1136 }
1137
1138 /*----- X25519 and related algorithms -------------------------------------*/
1139
1140 #define XDHS(_)                                                         \
1141   _(X25519, x25519)                                                     \
1142   _(X448, x448)
1143
1144 #define DEFXDH(X, x)                                                    \
1145   static PyObject *meth_##x(PyObject *me, PyObject *arg)                \
1146   {                                                                     \
1147     const char *k, *p;                                                  \
1148     Py_ssize_t ksz, psz;                                                \
1149     PyObject *rc = 0;                                                   \
1150     if (!PyArg_ParseTuple(arg, "s#s#:" #x, &k, &ksz, &p, &psz))         \
1151       goto end;                                                         \
1152     if (ksz != X##_KEYSZ) VALERR("bad key length");                     \
1153     if (psz != X##_PUBSZ) VALERR("bad public length");                  \
1154     rc = bytestring_pywrap(0, X##_OUTSZ);                               \
1155     x((octet *)PyString_AS_STRING(rc),                                  \
1156       (const octet *)k, (const octet *)p);                              \
1157     return (rc);                                                        \
1158   end:                                                                  \
1159     return (0);                                                         \
1160   }
1161 XDHS(DEFXDH)
1162 #undef DEFXDH
1163
1164 /*----- Ed25519 and related algorithms ------------------------------------*/
1165
1166 #define EDDSAS(_)                                                       \
1167   _(ED25519, ed25519, -1, ctx)
1168
1169 #define DEFEDDSA(ED, ed, phdflt, sigver)                                \
1170                                                                         \
1171   static PyObject *meth_##ed##_pubkey(PyObject *me, PyObject *arg)      \
1172   {                                                                     \
1173     const char *k;                                                      \
1174     Py_ssize_t ksz;                                                     \
1175     PyObject *rc = 0;                                                   \
1176     if (!PyArg_ParseTuple(arg, "s#:" #ed "_pubkey", &k, &ksz))          \
1177       goto end;                                                         \
1178     rc = bytestring_pywrap(0, ED##_PUBSZ);                              \
1179     ed##_pubkey((octet *)PyString_AS_STRING(rc), k, ksz);               \
1180     return (rc);                                                        \
1181   end:                                                                  \
1182     return (0);                                                         \
1183   }                                                                     \
1184                                                                         \
1185   static PyObject *meth_##ed##_sign(PyObject *me, PyObject *arg,        \
1186                                     PyObject *kw)                       \
1187   {                                                                     \
1188     const char *k, *p = 0, *c = 0, *m;                                  \
1189     Py_ssize_t ksz, psz, csz = 0, msz;                                  \
1190     int ph = phdflt;                                                    \
1191     PyObject *rc = 0;                                                   \
1192     octet pp[ED##_PUBSZ];                                               \
1193     char *kwlist[] = { "key", "msg", "pub", "perso", "phflag", 0 };     \
1194     if (!PyArg_ParseTupleAndKeywords(arg, kw,                           \
1195                                      "s#s#|s#s#O&:" #ed "_sign",        \
1196                                      kwlist,                            \
1197                                      &k, &ksz, &m, &msz, &p, &psz,      \
1198                                      &c, &csz, convbool, &ph))          \
1199       goto end;                                                         \
1200     if (p && psz != ED##_PUBSZ) VALERR("bad public length");            \
1201     if (c && csz > ED##_MAXPERSOSZ)                                     \
1202       VALERR("personalization string too long");                        \
1203     if (c && ph == -1) ph = 0;                                          \
1204     if (!p) { p = (const char *)pp; ed##_pubkey(pp, k, ksz); }          \
1205     rc = bytestring_pywrap(0, ED##_SIGSZ);                              \
1206     ed##sigver##_sign((octet *)PyString_AS_STRING(rc), k, ksz,          \
1207                       (const octet *)p, ph, c, csz, m, msz);            \
1208     return (rc);                                                        \
1209   end:                                                                  \
1210     return (0);                                                         \
1211   }                                                                     \
1212                                                                         \
1213   static PyObject *meth_##ed##_verify(PyObject *me,                     \
1214                                       PyObject *arg, PyObject *kw)      \
1215   {                                                                     \
1216     const char *p, *c = 0, *m, *s;                                      \
1217     Py_ssize_t psz, csz = 0, msz, ssz;                                  \
1218     int ph = phdflt;                                                    \
1219     PyObject *rc = 0;                                                   \
1220     char *kwlist[] = { "pub", "msg", "sig", "perso", "phflag", 0 };     \
1221     if (!PyArg_ParseTupleAndKeywords(arg, kw,                           \
1222                                      "s#s#s#|s#O&:" #ed "_verify",      \
1223                                      kwlist,                            \
1224                                      &p, &psz, &m, &msz, &s, &ssz,      \
1225                                      &c, &csz, convbool, &ph))          \
1226       goto end;                                                         \
1227     if (psz != ED##_PUBSZ) VALERR("bad public length");                 \
1228     if (ssz != ED##_SIGSZ) VALERR("bad signature length");              \
1229     if (c && csz > ED##_MAXPERSOSZ)                                     \
1230       VALERR("personalization string too long");                        \
1231     if (c && ph == -1) ph = 0;                                          \
1232     rc = getbool(!ed##sigver##_verify((const octet *)p, ph, c, csz,     \
1233                                       m, msz, (const octet *)s));       \
1234     return (rc);                                                        \
1235   end:                                                                  \
1236     return (0);                                                         \
1237   }
1238 EDDSAS(DEFEDDSA)
1239 #undef DEFEDDSA
1240
1241 /*----- Global stuff ------------------------------------------------------*/
1242
1243 static PyMethodDef methods[] = {
1244 #define METHNAME(name) meth_##name
1245   KWMETH(_p1crypt_encode,               0)
1246   KWMETH(_p1crypt_decode,               0)
1247   KWMETH(_p1sig_encode,                 0)
1248   KWMETH(_p1sig_decode,                 0)
1249   KWMETH(_oaep_encode,                  0)
1250   KWMETH(_oaep_decode,                  0)
1251   KWMETH(_pss_encode,                   0)
1252   KWMETH(_pss_decode,                   0)
1253   KWMETH(_RSAPriv_generate,             "\
1254 generate(NBITS, [event = pgen_nullev, rng = rand, nsteps = 0]) -> R")
1255 #define DEFMETH(X, x)                                                   \
1256   METH  (x,                             "\
1257 " #x "(KEY, PUBLIC) -> SHARED")
1258   XDHS(DEFMETH)
1259 #undef DEFMETH
1260 #define DEFMETH(ED, ed, phdflt, sigver)                                 \
1261   METH  (ed##_pubkey,                   "\
1262 " #ed "_pubkey(KEY) -> PUBLIC")                                         \
1263   KWMETH(ed##_sign,                     "\
1264 " #ed "_sign(KEY, MSG, [pub = PUBLIC, "                                 \
1265          "perso = STRING, phflag = BOOL]) -> SIG")                      \
1266   KWMETH(ed##_verify,                   "\
1267 " #ed "_verify(PUBLIC, MSG, SIG, "                                      \
1268          "[perso = STRING, phflag = BOOL]) -> BOOL")
1269   EDDSAS(DEFMETH)
1270 #undef DEFMETH
1271 #undef METHNAME
1272   { 0 }
1273 };
1274
1275 void pubkey_pyinit(void)
1276 {
1277   INITTYPE(dsapub, root);
1278   INITTYPE(dsapriv, dsapub);
1279   INITTYPE(kcdsapub, root);
1280   INITTYPE(kcdsapriv, kcdsapub);
1281   INITTYPE(rsapub, root);
1282   INITTYPE(rsapriv, rsapub);
1283   addmethods(methods);
1284 }
1285
1286 void pubkey_pyinsert(PyObject *mod)
1287 {
1288   INSERT("DSAPub", dsapub_pytype);
1289   INSERT("DSAPriv", dsapriv_pytype);
1290   INSERT("KCDSAPub", kcdsapub_pytype);
1291   INSERT("KCDSAPriv", kcdsapriv_pytype);
1292   INSERT("RSAPub", rsapub_pytype);
1293   INSERT("RSAPriv", rsapriv_pytype);
1294 }
1295
1296 /*----- That's all, folks -------------------------------------------------*/