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

   1 /* -*-c-*-
   2  *
   3  * Public-key cryptography
   4  *
   5  * (c) 2004 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the Python interface to Catacomb.
  11  *
  12  * Catacomb/Python is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * Catacomb/Python is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with Catacomb/Python; if not, write to the Free Software Foundation,
  24  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 /*----- Header files ------------------------------------------------------*/
  28
  29 #include "catacomb-python.h"
  30
  31 /*----- DSA and similar ---------------------------------------------------*/
  32
  33 typedef struct dsa_pyobj {
  34   PyObject_HEAD
  35   PyObject *G, *u, *p, *rng, *hash;
  36   gdsa d;
  37 } dsa_pyobj;
  38
  39 static PyTypeObject *dsapub_pytype, *dsapriv_pytype;
  40 static PyTypeObject *kcdsapub_pytype, *kcdsapriv_pytype;
  41 #define DSA_D(o) (&((dsa_pyobj *)(o))->d)
  42 #define DSA_G(o) (((dsa_pyobj *)(o))->G)
  43 #define DSA_U(o) (((dsa_pyobj *)(o))->u)
  44 #define DSA_P(o) (((dsa_pyobj *)(o))->p)
  45 #define DSA_RNG(o) (((dsa_pyobj *)(o))->rng)
  46 #define DSA_HASH(o) (((dsa_pyobj *)(o))->hash)
  47
  48 static void dsa_pydealloc(PyObject *me)
  49 {
  50   dsa_pyobj *g = (dsa_pyobj *)me;
  51   Py_DECREF(g->G); Py_DECREF(g->u); Py_DECREF(g->p);
  52   Py_DECREF(g->rng); Py_DECREF(g->hash);
  53   FREEOBJ(me);
  54 }
  55
  56 static PyObject *dsa_setup(PyTypeObject *ty, PyObject *G, PyObject *u,
  57                            PyObject *p, PyObject *rng, PyObject *hash,
  58                            void (*calcpub)(group *, ge *, mp *))
  59 {
  60   dsa_pyobj *g;
  61   ge *pp;
  62
  63   g = PyObject_New(dsa_pyobj, ty);
  64   if (p) Py_INCREF(p);
  65   if (!u) {
  66     g->d.u = 0;
  67     u = Py_None;
  68   } else {
  69     if ((g->d.u = getmp(u)) == 0)
  70       goto end;
  71     if (MP_PYCHECK(u)) Py_INCREF(u);
  72     else u = mp_pywrap(g->d.u);
  73   }
  74   if (!p) {
  75     assert(g->d.u); assert(calcpub);
  76     pp = G_CREATE(GROUP_G(G));
  77     calcpub(GROUP_G(G), pp, g->d.u);
  78     p = ge_pywrap(G, pp);
  79   } else if (GROUP_G(G) != GE_G(p) && !group_samep(GROUP_G(G), GE_G(p)))
  80     TYERR("public key not from group");
  81   g->d.g = GROUP_G(G);
  82   g->d.p = GE_X(p);
  83   g->d.r = GRAND_R(rng);
  84   g->d.h = GCHASH_CH(hash);
  85   g->G = G; Py_INCREF(G); g->u = u; g->p = p;
  86   g->rng = rng; Py_INCREF(rng); g->hash = hash; Py_INCREF(hash);
  87   return ((PyObject *)g);
  88 end:
  89   Py_XDECREF(p); FREEOBJ(g);
  90   return (0);
  91 }
  92
  93 static PyObject *dsapub_pynew(PyTypeObject *ty,
  94                               PyObject *arg, PyObject *kw)
  95 {
  96   PyObject *G, *p, *rng = rand_pyobj, *hash = sha_pyobj;
  97   PyObject *rc = 0;
  98   static const char *const kwlist[] = { "G", "p", "hash", "rng", 0 };
  99
 100   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O!|O!O!:new", KWLIST,
 101                                    group_pytype, &G,
 102                                    ge_pytype, &p,
 103                                    gchash_pytype, &hash,
 104                                    grand_pytype, &rng) ||
 105       (rc = dsa_setup(dsapub_pytype, G, 0, p, rng, hash, 0)) == 0)
 106     goto end;
 107 end:
 108   return (rc);
 109 }
 110
 111 static PyObject *dsameth_beginhash(PyObject *me, PyObject *arg)
 112 {
 113   if (!PyArg_ParseTuple(arg, ":beginhash")) return (0);
 114   return (ghash_pywrap(DSA_HASH(me), gdsa_beginhash(DSA_D(me))));
 115 }
 116
 117 static PyObject *dsameth_endhash(PyObject *me, PyObject *arg)
 118 {
 119   ghash *h;
 120   PyObject *rc;
 121   if (!PyArg_ParseTuple(arg, "O&:endhash", convghash, &h)) return (0);
 122   gdsa_endhash(DSA_D(me), h);
 123   h = GH_COPY(h);
 124   rc = bytestring_pywrap(0, GH_CLASS(h)->hashsz);
 125   GH_DONE(h, PyString_AS_STRING(rc));
 126   GH_DESTROY(h);
 127   return (rc);
 128 }
 129
 130 static PyObject *dsameth_sign(PyObject *me, PyObject *arg, PyObject *kw)
 131 {
 132   gdsa_sig s = GDSA_SIG_INIT;
 133   char *p;
 134   Py_ssize_t n;
 135   mp *k = 0;
 136   PyObject *rc = 0;
 137   static const char *const kwlist[] = { "msg", "k", 0 };
 138
 139   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#|O&:sign", KWLIST,
 140                                    &p, &n, convmp, &k))
 141     goto end;
 142   if (n != DSA_D(me)->h->hashsz)
 143     VALERR("bad message length (doesn't match hash size)");
 144   gdsa_sign(DSA_D(me), &s, p, k);
 145   rc = Py_BuildValue("(NN)", mp_pywrap(s.r), mp_pywrap(s.s));
 146 end:
 147   mp_drop(k);
 148   return (rc);
 149 }
 150
 151 static PyObject *dsameth_verify(PyObject *me, PyObject *arg)
 152 {
 153   char *p;
 154   Py_ssize_t n;
 155   gdsa_sig s = GDSA_SIG_INIT;
 156   PyObject *rc = 0;
 157
 158   if (!PyArg_ParseTuple(arg, "s#(O&O&):verify",
 159                         &p, &n, convmp, &s.r, convmp, &s.s))
 160     goto end;
 161   if (n != DSA_D(me)->h->hashsz)
 162     VALERR("bad message length (doesn't match hash size)");
 163   rc = getbool(!gdsa_verify(DSA_D(me), &s, p));
 164 end:
 165   mp_drop(s.r);
 166   mp_drop(s.s);
 167   return (rc);
 168 }
 169
 170 static void dsa_calcpub(group *g, ge *p, mp *u) { G_EXP(g, p, g->g, u); }
 171
 172 static PyObject *dsapriv_pynew(PyTypeObject *ty,
 173                                PyObject *arg, PyObject *kw)
 174 {
 175   PyObject *G, *p = 0, *u, *rng = rand_pyobj, *hash = sha_pyobj;
 176   PyObject *rc = 0;
 177   static const char *const kwlist[] = { "G", "u", "p", "hash", "rng", 0 };
 178
 179   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O|O!O!O!:new", KWLIST,
 180                                    group_pytype, &G,
 181                                    &u,
 182                                    ge_pytype, &p,
 183                                    gchash_pytype, &hash,
 184                                    grand_pytype, &rng) ||
 185       (rc = dsa_setup(dsapriv_pytype, G, u, p, rng, hash, dsa_calcpub)) == 0)
 186     goto end;
 187 end:
 188   return (rc);
 189 }
 190
 191 static const PyMethodDef dsapub_pymethods[] = {
 192 #define METHNAME(name) dsameth_##name
 193   METH  (beginhash,     "D.beginhash() -> hash object")
 194   METH  (endhash,       "D.endhash(H) -> BYTES")
 195   METH  (verify,        "D.verify(MSG, (R, S)) -> true/false")
 196 #undef METHNAME
 197   { 0 }
 198 };
 199
 200 static const PyMethodDef dsapriv_pymethods[] = {
 201 #define METHNAME(name) dsameth_##name
 202   KWMETH(sign,          "D.sign(MSG, [k = K]) -> R, S")
 203 #undef METHNAME
 204   { 0 }
 205 };
 206
 207 static const PyMemberDef dsapub_pymembers[] = {
 208 #define MEMBERSTRUCT dsa_pyobj
 209   MEMBER(G,     T_OBJECT, READONLY, "D.G -> group to work in")
 210   MEMBER(p,     T_OBJECT, READONLY, "D.p -> public key (group element")
 211   MEMBER(rng,   T_OBJECT, READONLY, "D.rng -> random number generator")
 212   MEMBER(hash,  T_OBJECT, READONLY, "D.hash -> hash class")
 213 #undef MEMBERSTRUCT
 214   { 0 }
 215 };
 216
 217 static const PyMemberDef dsapriv_pymembers[] = {
 218 #define MEMBERSTRUCT dsa_pyobj
 219   MEMBER(u,     T_OBJECT, READONLY, "D.u -> private key (exponent)")
 220 #undef MEMBERSTRUCT
 221   { 0 }
 222 };
 223
 224 static PyTypeObject dsapub_pytype_skel = {
 225   PyObject_HEAD_INIT(0) 0,              /* Header */
 226   "DSAPub",                             /* @tp_name@ */
 227   sizeof(dsa_pyobj),                    /* @tp_basicsize@ */
 228   0,                                    /* @tp_itemsize@ */
 229
 230   dsa_pydealloc,                        /* @tp_dealloc@ */
 231   0,                                    /* @tp_print@ */
 232   0,                                    /* @tp_getattr@ */
 233   0,                                    /* @tp_setattr@ */
 234   0,                                    /* @tp_compare@ */
 235   0,                                    /* @tp_repr@ */
 236   0,                                    /* @tp_as_number@ */
 237   0,                                    /* @tp_as_sequence@ */
 238   0,                                    /* @tp_as_mapping@ */
 239   0,                                    /* @tp_hash@ */
 240   0,                                    /* @tp_call@ */
 241   0,                                    /* @tp_str@ */
 242   0,                                    /* @tp_getattro@ */
 243   0,                                    /* @tp_setattro@ */
 244   0,                                    /* @tp_as_buffer@ */
 245   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 246     Py_TPFLAGS_BASETYPE,
 247
 248   /* @tp_doc@ */
 249   "DSAPub(GROUP, P, [hash = sha], [rng = rand]): DSA public key.",
 250
 251   0,                                    /* @tp_traverse@ */
 252   0,                                    /* @tp_clear@ */
 253   0,                                    /* @tp_richcompare@ */
 254   0,                                    /* @tp_weaklistoffset@ */
 255   0,                                    /* @tp_iter@ */
 256   0,                                    /* @tp_iternext@ */
 257   PYMETHODS(dsapub),                    /* @tp_methods@ */
 258   PYMEMBERS(dsapub),                    /* @tp_members@ */
 259   0,                                    /* @tp_getset@ */
 260   0,                                    /* @tp_base@ */
 261   0,                                    /* @tp_dict@ */
 262   0,                                    /* @tp_descr_get@ */
 263   0,                                    /* @tp_descr_set@ */
 264   0,                                    /* @tp_dictoffset@ */
 265   0,                                    /* @tp_init@ */
 266   PyType_GenericAlloc,                  /* @tp_alloc@ */
 267   dsapub_pynew,                         /* @tp_new@ */
 268   0,                                    /* @tp_free@ */
 269   0                                     /* @tp_is_gc@ */
 270 };
 271
 272 static PyTypeObject dsapriv_pytype_skel = {
 273   PyObject_HEAD_INIT(0) 0,              /* Header */
 274   "DSAPriv",                            /* @tp_name@ */
 275   sizeof(dsa_pyobj),                    /* @tp_basicsize@ */
 276   0,                                    /* @tp_itemsize@ */
 277
 278   0,                                    /* @tp_dealloc@ */
 279   0,                                    /* @tp_print@ */
 280   0,                                    /* @tp_getattr@ */
 281   0,                                    /* @tp_setattr@ */
 282   0,                                    /* @tp_compare@ */
 283   0,                                    /* @tp_repr@ */
 284   0,                                    /* @tp_as_number@ */
 285   0,                                    /* @tp_as_sequence@ */
 286   0,                                    /* @tp_as_mapping@ */
 287   0,                                    /* @tp_hash@ */
 288   0,                                    /* @tp_call@ */
 289   0,                                    /* @tp_str@ */
 290   0,                                    /* @tp_getattro@ */
 291   0,                                    /* @tp_setattro@ */
 292   0,                                    /* @tp_as_buffer@ */
 293   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 294     Py_TPFLAGS_BASETYPE,
 295
 296   /* @tp_doc@ */
 297   "DSAPriv(GROUP, U, [p = u G], [hash = sha], [rng = rand]): "
 298                                                           "DSA private key.",
 299
 300   0,                                    /* @tp_traverse@ */
 301   0,                                    /* @tp_clear@ */
 302   0,                                    /* @tp_richcompare@ */
 303   0,                                    /* @tp_weaklistoffset@ */
 304   0,                                    /* @tp_iter@ */
 305   0,                                    /* @tp_iternext@ */
 306   PYMETHODS(dsapriv),                   /* @tp_methods@ */
 307   PYMEMBERS(dsapriv),                   /* @tp_members@ */
 308   0,                                    /* @tp_getset@ */
 309   0,                                    /* @tp_base@ */
 310   0,                                    /* @tp_dict@ */
 311   0,                                    /* @tp_descr_get@ */
 312   0,                                    /* @tp_descr_set@ */
 313   0,                                    /* @tp_dictoffset@ */
 314   0,                                    /* @tp_init@ */
 315   PyType_GenericAlloc,                  /* @tp_alloc@ */
 316   dsapriv_pynew,                        /* @tp_new@ */
 317   0,                                    /* @tp_free@ */
 318   0                                     /* @tp_is_gc@ */
 319 };
 320
 321 static PyObject *kcdsapub_pynew(PyTypeObject *ty,
 322                                 PyObject *arg, PyObject *kw)
 323 {
 324   PyObject *G, *p, *rng = rand_pyobj, *hash = has160_pyobj;
 325   PyObject *rc = 0;
 326   static const char *const kwlist[] = { "G", "p", "hash", "rng", 0 };
 327
 328   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O!|O!O!:new", KWLIST,
 329                                    group_pytype, &G,
 330                                    ge_pytype, &p,
 331                                    gchash_pytype, &hash,
 332                                    grand_pytype, &rng) ||
 333       (rc = dsa_setup(kcdsapub_pytype, G, 0, p, rng, hash, 0)) == 0)
 334     goto end;
 335 end:
 336   return (rc);
 337 }
 338
 339 static void kcdsa_calcpub(group *g, ge *p, mp *u)
 340 {
 341   mp *uinv = mp_modinv(MP_NEW, u, g->r);
 342   G_EXP(g, p, g->g, uinv);
 343   mp_drop(uinv);
 344 }
 345
 346 static PyObject *kcdsapriv_pynew(PyTypeObject *ty,
 347                                  PyObject *arg, PyObject *kw)
 348 {
 349   PyObject *G, *u, *p = 0, *rng = rand_pyobj, *hash = has160_pyobj;
 350   PyObject *rc = 0;
 351   static const char *const kwlist[] = { "G", "u", "p", "hash", "rng", 0 };
 352
 353   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O|O!O!O!:new", KWLIST,
 354                                    group_pytype, &G,
 355                                    &u,
 356                                    ge_pytype, &p,
 357                                    gchash_pytype, &hash,
 358                                    grand_pytype, &rng) ||
 359       (rc = dsa_setup(kcdsapriv_pytype, G, u, p,
 360                       rng, hash, kcdsa_calcpub)) == 0)
 361     goto end;
 362 end:
 363   return (rc);
 364 }
 365
 366 static PyObject *kcdsameth_beginhash(PyObject *me, PyObject *arg)
 367 {
 368   if (!PyArg_ParseTuple(arg, ":beginhash")) return (0);
 369   return (ghash_pywrap(DSA_HASH(me), gkcdsa_beginhash(DSA_D(me))));
 370 }
 371
 372 static PyObject *kcdsameth_endhash(PyObject *me, PyObject *arg)
 373 {
 374   ghash *h;
 375   PyObject *rc;
 376   if (!PyArg_ParseTuple(arg, "O&:endhash", convghash, &h)) return (0);
 377   gkcdsa_endhash(DSA_D(me), h);
 378   h = GH_COPY(h);
 379   rc = bytestring_pywrap(0, GH_CLASS(h)->hashsz);
 380   GH_DONE(h, PyString_AS_STRING(rc));
 381   GH_DESTROY(h);
 382   return (rc);
 383 }
 384
 385 static PyObject *kcdsameth_sign(PyObject *me, PyObject *arg, PyObject *kw)
 386 {
 387   gkcdsa_sig s = GKCDSA_SIG_INIT;
 388   char *p;
 389   Py_ssize_t n;
 390   mp *k = 0;
 391   PyObject *r = 0, *rc = 0;
 392   static const char *const kwlist[] = { "msg", "k", 0 };
 393
 394   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#|O&:sign", KWLIST,
 395                                    &p, &n, convmp, &k))
 396     goto end;
 397   if (n != DSA_D(me)->h->hashsz)
 398     VALERR("bad message length (doesn't match hash size)");
 399   r = bytestring_pywrap(0, DSA_D(me)->h->hashsz);
 400   s.r = (octet *)PyString_AS_STRING(r);
 401   gkcdsa_sign(DSA_D(me), &s, p, k);
 402   rc = Py_BuildValue("(ON)", r, mp_pywrap(s.s));
 403 end:
 404   Py_XDECREF(r);
 405   mp_drop(k);
 406   return (rc);
 407 }
 408
 409 static PyObject *kcdsameth_verify(PyObject *me, PyObject *arg)
 410 {
 411   char *p;
 412   Py_ssize_t n, rn;
 413   gkcdsa_sig s = GKCDSA_SIG_INIT;
 414   PyObject *rc = 0;
 415
 416   if (!PyArg_ParseTuple(arg, "s#(s#O&):verify",
 417                         &p, &n, &s.r, &rn, convmp, &s.s))
 418     goto end;
 419   if (n != DSA_D(me)->h->hashsz)
 420     VALERR("bad message length (doesn't match hash size)");
 421   if (rn != DSA_D(me)->h->hashsz)
 422     VALERR("bad signature `r' length (doesn't match hash size)");
 423   rc = getbool(!gkcdsa_verify(DSA_D(me), &s, p));
 424 end:
 425   mp_drop(s.s);
 426   return (rc);
 427 }
 428
 429 static const 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 const PyMethodDef kcdsapriv_pymethods[] = {
 439 #define METHNAME(name) kcdsameth_##name
 440   KWMETH(sign,          "D.sign(MSG, [k = K]) -> R, S")
 441 #undef METHNAME
 442   { 0 }
 443 };
 444
 445 static PyTypeObject kcdsapub_pytype_skel = {
 446   PyObject_HEAD_INIT(0) 0,              /* Header */
 447   "KCDSAPub",                           /* @tp_name@ */
 448   sizeof(dsa_pyobj),                    /* @tp_basicsize@ */
 449   0,                                    /* @tp_itemsize@ */
 450
 451   dsa_pydealloc,                        /* @tp_dealloc@ */
 452   0,                                    /* @tp_print@ */
 453   0,                                    /* @tp_getattr@ */
 454   0,                                    /* @tp_setattr@ */
 455   0,                                    /* @tp_compare@ */
 456   0,                                    /* @tp_repr@ */
 457   0,                                    /* @tp_as_number@ */
 458   0,                                    /* @tp_as_sequence@ */
 459   0,                                    /* @tp_as_mapping@ */
 460   0,                                    /* @tp_hash@ */
 461   0,                                    /* @tp_call@ */
 462   0,                                    /* @tp_str@ */
 463   0,                                    /* @tp_getattro@ */
 464   0,                                    /* @tp_setattro@ */
 465   0,                                    /* @tp_as_buffer@ */
 466   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 467     Py_TPFLAGS_BASETYPE,
 468
 469   /* @tp_doc@ */
 470   "KCDSAPub(GROUP, P, [hash = sha], [rng = rand]): KCDSA public key.",
 471
 472   0,                                    /* @tp_traverse@ */
 473   0,                                    /* @tp_clear@ */
 474   0,                                    /* @tp_richcompare@ */
 475   0,                                    /* @tp_weaklistoffset@ */
 476   0,                                    /* @tp_iter@ */
 477   0,                                    /* @tp_iternext@ */
 478   PYMETHODS(kcdsapub),                  /* @tp_methods@ */
 479   PYMEMBERS(dsapub),                    /* @tp_members@ */
 480   0,                                    /* @tp_getset@ */
 481   0,                                    /* @tp_base@ */
 482   0,                                    /* @tp_dict@ */
 483   0,                                    /* @tp_descr_get@ */
 484   0,                                    /* @tp_descr_set@ */
 485   0,                                    /* @tp_dictoffset@ */
 486   0,                                    /* @tp_init@ */
 487   PyType_GenericAlloc,                  /* @tp_alloc@ */
 488   kcdsapub_pynew,                       /* @tp_new@ */
 489   0,                                    /* @tp_free@ */
 490   0                                     /* @tp_is_gc@ */
 491 };
 492
 493 static PyTypeObject kcdsapriv_pytype_skel = {
 494   PyObject_HEAD_INIT(0) 0,              /* Header */
 495   "KCDSAPriv",                          /* @tp_name@ */
 496   sizeof(dsa_pyobj),                    /* @tp_basicsize@ */
 497   0,                                    /* @tp_itemsize@ */
 498
 499   0,                                    /* @tp_dealloc@ */
 500   0,                                    /* @tp_print@ */
 501   0,                                    /* @tp_getattr@ */
 502   0,                                    /* @tp_setattr@ */
 503   0,                                    /* @tp_compare@ */
 504   0,                                    /* @tp_repr@ */
 505   0,                                    /* @tp_as_number@ */
 506   0,                                    /* @tp_as_sequence@ */
 507   0,                                    /* @tp_as_mapping@ */
 508   0,                                    /* @tp_hash@ */
 509   0,                                    /* @tp_call@ */
 510   0,                                    /* @tp_str@ */
 511   0,                                    /* @tp_getattro@ */
 512   0,                                    /* @tp_setattro@ */
 513   0,                                    /* @tp_as_buffer@ */
 514   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 515     Py_TPFLAGS_BASETYPE,
 516
 517   /* @tp_doc@ */
 518   "KCDSAPriv(GROUP, U, [p = u G], [hash = sha], [rng = rand]): "
 519                                                         "KCDSA private key.",
 520
 521   0,                                    /* @tp_traverse@ */
 522   0,                                    /* @tp_clear@ */
 523   0,                                    /* @tp_richcompare@ */
 524   0,                                    /* @tp_weaklistoffset@ */
 525   0,                                    /* @tp_iter@ */
 526   0,                                    /* @tp_iternext@ */
 527   PYMETHODS(kcdsapriv),                 /* @tp_methods@ */
 528   PYMEMBERS(dsapriv),                   /* @tp_members@ */
 529   0,                                    /* @tp_getset@ */
 530   0,                                    /* @tp_base@ */
 531   0,                                    /* @tp_dict@ */
 532   0,                                    /* @tp_descr_get@ */
 533   0,                                    /* @tp_descr_set@ */
 534   0,                                    /* @tp_dictoffset@ */
 535   0,                                    /* @tp_init@ */
 536   PyType_GenericAlloc,                  /* @tp_alloc@ */
 537   kcdsapriv_pynew,                      /* @tp_new@ */
 538   0,                                    /* @tp_free@ */
 539   0                                     /* @tp_is_gc@ */
 540 };
 541
 542 /*----- RSA ---------------------------------------------------------------*/
 543
 544 typedef struct rsapub_pyobj {
 545   PyObject_HEAD
 546   rsa_pub pub;
 547   rsa_pubctx pubctx;
 548 } rsapub_pyobj;
 549
 550 #define RSA_PUB(o) (&((rsapub_pyobj *)(o))->pub)
 551 #define RSA_PUBCTX(o) (&((rsapub_pyobj *)(o))->pubctx)
 552
 553 typedef struct rsapriv_pyobj {
 554   PyObject_HEAD
 555   rsa_pub pub;
 556   rsa_pubctx pubctx;
 557   rsa_priv priv;
 558   rsa_privctx privctx;
 559   PyObject *rng;
 560 } rsapriv_pyobj;
 561
 562 #define RSA_PRIV(o) (&((rsapriv_pyobj *)(o))->priv)
 563 #define RSA_PRIVCTX(o) (&((rsapriv_pyobj *)(o))->privctx)
 564 #define RSA_RNG(o) (((rsapriv_pyobj *)(o))->rng)
 565
 566 static PyTypeObject *rsapub_pytype, *rsapriv_pytype;
 567
 568 static PyObject *rsapub_pynew(PyTypeObject *ty,
 569                               PyObject *arg, PyObject *kw)
 570 {
 571   rsa_pub rp = { 0 };
 572   rsapub_pyobj *o;
 573   static const char *const kwlist[] = { "n", "e", 0 };
 574
 575   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&O&:new", KWLIST,
 576                                    convmp, &rp.n, convmp, &rp.e))
 577     goto end;
 578   if (!MP_ODDP(rp.n)) VALERR("RSA modulus must be even");
 579   o = (rsapub_pyobj *)ty->tp_alloc(ty, 0);
 580   o->pub = rp;
 581   rsa_pubcreate(&o->pubctx, &o->pub);
 582   return ((PyObject *)o);
 583 end:
 584   rsa_pubfree(&rp);
 585   return (0);
 586 }
 587
 588 static void rsapub_pydealloc(PyObject *me)
 589 {
 590   rsa_pubdestroy(RSA_PUBCTX(me));
 591   rsa_pubfree(RSA_PUB(me));
 592   FREEOBJ(me);
 593 }
 594
 595 static PyObject *rsaget_n(PyObject *me, void *hunoz)
 596   { return mp_pywrap(MP_COPY(RSA_PUB(me)->n)); }
 597
 598 static PyObject *rsaget_e(PyObject *me, void *hunoz)
 599   { return mp_pywrap(MP_COPY(RSA_PUB(me)->e)); }
 600
 601 static PyObject *rsameth_pubop(PyObject *me, PyObject *arg)
 602 {
 603   mp *x = 0;
 604   PyObject *rc = 0;
 605
 606   if (!PyArg_ParseTuple(arg, "O&:pubop", convmp, &x)) goto end;
 607   rc = mp_pywrap(rsa_pubop(RSA_PUBCTX(me), MP_NEW, x));
 608 end:
 609   mp_drop(x);
 610   return (rc);
 611 }
 612
 613 static PyObject *rsapriv_dopywrap(PyTypeObject *ty,
 614                                   rsa_priv *rp, PyObject *rng)
 615 {
 616   rsapriv_pyobj *o;
 617
 618   o = (rsapriv_pyobj *)ty->tp_alloc(ty, 0);
 619   o->priv = *rp;
 620   o->pub.n = rp->n;
 621   o->pub.e = rp->e;
 622   rsa_privcreate(&o->privctx, &o->priv, &rand_global);
 623   rsa_pubcreate(&o->pubctx, &o->pub);
 624   if (!rng) {
 625     rng = Py_None;
 626     Py_INCREF(rng);
 627   }
 628   o->rng = rng;
 629   return ((PyObject *)o);
 630 }
 631
 632 PyObject *rsapriv_pywrap(rsa_priv *rp)
 633   { return rsapriv_dopywrap(rsapriv_pytype, rp, 0); }
 634
 635 static PyObject *rsapriv_pynew(PyTypeObject *ty,
 636                                PyObject *arg, PyObject *kw)
 637 {
 638   rsa_priv rp = { 0 };
 639   PyObject *rng = Py_None;
 640   static const char *const kwlist[] =
 641     { "n", "e", "d", "p", "q", "dp", "dq", "q_inv", "rng", 0 };
 642
 643   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&O&O&O&O&O&O&O&O:new", KWLIST,
 644                                    convmp, &rp.n, convmp, &rp.e,
 645                                    convmp, &rp.d,
 646                                    convmp, &rp.p, convmp, &rp.q,
 647                                    convmp, &rp.dp, convmp, &rp.dq,
 648                                    convmp, &rp.q_inv,
 649                                    &rng))
 650     goto end;
 651   if ((rp.n && !MP_ODDP(rp.n)) ||
 652       (rp.p && !MP_ODDP(rp.p)) ||
 653       (rp.q && !MP_ODDP(rp.q)))
 654     VALERR("RSA modulus and factors must be odd");
 655   if (rsa_recover(&rp)) VALERR("couldn't construct private key");
 656   if (rng != Py_None && !GRAND_PYCHECK(rng))
 657     TYERR("not a random number source");
 658   Py_INCREF(rng);
 659   return (rsapriv_dopywrap(ty, &rp, rng));
 660 end:
 661   rsa_privfree(&rp);
 662   return (0);
 663 }
 664
 665 static void rsapriv_pydealloc(PyObject *me)
 666 {
 667   RSA_PRIVCTX(me)->r = &rand_global;
 668   rsa_privdestroy(RSA_PRIVCTX(me));
 669   rsa_privfree(RSA_PRIV(me));
 670   Py_DECREF(RSA_RNG(me));
 671   FREEOBJ(me);
 672 }
 673
 674 static PyObject *rsaget_d(PyObject *me, void *hunoz)
 675   { return mp_pywrap(MP_COPY(RSA_PRIV(me)->d)); }
 676
 677 static PyObject *rsaget_p(PyObject *me, void *hunoz)
 678   { return mp_pywrap(MP_COPY(RSA_PRIV(me)->p)); }
 679
 680 static PyObject *rsaget_q(PyObject *me, void *hunoz)
 681   { return mp_pywrap(MP_COPY(RSA_PRIV(me)->q)); }
 682
 683 static PyObject *rsaget_dp(PyObject *me, void *hunoz)
 684   { return mp_pywrap(MP_COPY(RSA_PRIV(me)->dp)); }
 685
 686 static PyObject *rsaget_dq(PyObject *me, void *hunoz)
 687   { return mp_pywrap(MP_COPY(RSA_PRIV(me)->dq)); }
 688
 689 static PyObject *rsaget_q_inv(PyObject *me, void *hunoz)
 690   { return mp_pywrap(MP_COPY(RSA_PRIV(me)->q_inv)); }
 691
 692 static PyObject *rsaget_rng(PyObject *me, void *hunoz)
 693   { RETURN_OBJ(RSA_RNG(me)); }
 694
 695 static int rsaset_rng(PyObject *me, PyObject *val, void *hunoz)
 696 {
 697   int rc = -1;
 698   if (!val)
 699     val = Py_None;
 700   else if (val != Py_None && !GRAND_PYCHECK(val))
 701     TYERR("expected grand or None");
 702   Py_DECREF(RSA_RNG(me));
 703   RSA_RNG(me) = val;
 704   Py_INCREF(val);
 705   rc = 0;
 706 end:
 707   return (rc);
 708 }
 709
 710 static PyObject *rsameth_privop(PyObject *me, PyObject *arg, PyObject *kw)
 711 {
 712   PyObject *rng = RSA_RNG(me);
 713   mp *x = 0;
 714   PyObject *rc = 0;
 715   static const char *const kwlist[] = { "x", "rng", 0 };
 716
 717   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&|O:privop", KWLIST,
 718                                    convmp, &x, &rng))
 719     goto end;
 720   if (rng != Py_None && !GRAND_PYCHECK(rng))
 721     TYERR("not a random number source");
 722   RSA_PRIVCTX(me)->r = (rng == Py_None) ? 0 : GRAND_R(rng);
 723   rc = mp_pywrap(rsa_privop(RSA_PRIVCTX(me), MP_NEW, x));
 724 end:
 725   mp_drop(x);
 726   return (rc);
 727 }
 728
 729 static PyObject *rsameth_generate(PyObject *me, 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   struct excinfo exc = EXCINFO_INIT;
 737   pypgev evt = { { 0 } };
 738   static const char *const kwlist[] =
 739     { "nbits", "event", "rng", "nsteps", "e", 0 };
 740   PyObject *rc = 0;
 741
 742   evt.exc = &exc;
 743   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&|O&O&O&O&:generate", KWLIST,
 744                                    convuint, &nbits, convpgev, &evt,
 745                                    convgrand, &r, convuint, &n,
 746                                    convmp, &e))
 747     goto end;
 748   if (e) MP_COPY(e);
 749   else e = mp_fromulong(MP_NEW, 65537);
 750   if (rsa_gen_e(&rp, nbits, e, r, n, evt.ev.proc, evt.ev.ctx))
 751     PGENERR(&exc);
 752   rc = rsapriv_pywrap(&rp);
 753 end:
 754   droppgev(&evt);
 755   mp_drop(e);
 756   return (rc);
 757 }
 758
 759 static const PyGetSetDef rsapub_pygetset[] = {
 760 #define GETSETNAME(op, name) rsa##op##_##name
 761   GET   (n,             "R.n -> N")
 762   GET   (e,             "R.e -> E")
 763 #undef GETSETNAME
 764   { 0 }
 765 };
 766
 767 static const PyMethodDef rsapub_pymethods[] = {
 768 #define METHNAME(name) rsameth_##name
 769   METH  (pubop,         "R.pubop(X) -> X^E (mod N)")
 770 #undef METHNAME
 771   { 0 }
 772 };
 773
 774 static const PyGetSetDef rsapriv_pygetset[] = {
 775 #define GETSETNAME(op, name) rsa##op##_##name
 776   GET   (d,             "R.d -> D")
 777   GET   (p,             "R.p -> P")
 778   GET   (q,             "R.q -> Q")
 779   GET   (dp,            "R.dp -> D mod (P - 1)")
 780   GET   (dq,            "R.dq -> D mod (Q - 1)")
 781   GET   (q_inv,         "R.q_inv -> Q^{-1} mod P")
 782   GETSET(rng,           "R.rng -> random number source for blinding")
 783 #undef GETSETNAME
 784   { 0 }
 785 };
 786
 787 static const PyMethodDef rsapriv_pymethods[] = {
 788 #define METHNAME(name) rsameth_##name
 789   KWMETH(privop,                "R.privop(X, [rng = None]) -> X^D (mod N)")
 790   KWSMTH(generate, "generate(NBITS, [event = pgen_nullev], [rng = rand], "
 791                                                         "[nsteps = 0]) -> R")
 792 #undef METHNAME
 793   { 0 }
 794 };
 795
 796 static PyTypeObject rsapub_pytype_skel = {
 797   PyObject_HEAD_INIT(0) 0,              /* Header */
 798   "RSAPub",                             /* @tp_name@ */
 799   sizeof(rsapub_pyobj),                 /* @tp_basicsize@ */
 800   0,                                    /* @tp_itemsize@ */
 801
 802   rsapub_pydealloc,                     /* @tp_dealloc@ */
 803   0,                                    /* @tp_print@ */
 804   0,                                    /* @tp_getattr@ */
 805   0,                                    /* @tp_setattr@ */
 806   0,                                    /* @tp_compare@ */
 807   0,                                    /* @tp_repr@ */
 808   0,                                    /* @tp_as_number@ */
 809   0,                                    /* @tp_as_sequence@ */
 810   0,                                    /* @tp_as_mapping@ */
 811   0,                                    /* @tp_hash@ */
 812   0,                                    /* @tp_call@ */
 813   0,                                    /* @tp_str@ */
 814   0,                                    /* @tp_getattro@ */
 815   0,                                    /* @tp_setattro@ */
 816   0,                                    /* @tp_as_buffer@ */
 817   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 818     Py_TPFLAGS_BASETYPE,
 819
 820   /* @tp_doc@ */
 821   "RSAPub(N, E): RSA public key.",
 822
 823   0,                                    /* @tp_traverse@ */
 824   0,                                    /* @tp_clear@ */
 825   0,                                    /* @tp_richcompare@ */
 826   0,                                    /* @tp_weaklistoffset@ */
 827   0,                                    /* @tp_iter@ */
 828   0,                                    /* @tp_iternext@ */
 829   PYMETHODS(rsapub),                    /* @tp_methods@ */
 830   0,                                    /* @tp_members@ */
 831   PYGETSET(rsapub),                     /* @tp_getset@ */
 832   0,                                    /* @tp_base@ */
 833   0,                                    /* @tp_dict@ */
 834   0,                                    /* @tp_descr_get@ */
 835   0,                                    /* @tp_descr_set@ */
 836   0,                                    /* @tp_dictoffset@ */
 837   0,                                    /* @tp_init@ */
 838   PyType_GenericAlloc,                  /* @tp_alloc@ */
 839   rsapub_pynew,                         /* @tp_new@ */
 840   0,                                    /* @tp_free@ */
 841   0                                     /* @tp_is_gc@ */
 842 };
 843
 844 static PyTypeObject rsapriv_pytype_skel = {
 845   PyObject_HEAD_INIT(0) 0,              /* Header */
 846   "RSAPriv",                            /* @tp_name@ */
 847   sizeof(rsapriv_pyobj),                /* @tp_basicsize@ */
 848   0,                                    /* @tp_itemsize@ */
 849
 850   rsapriv_pydealloc,                    /* @tp_dealloc@ */
 851   0,                                    /* @tp_print@ */
 852   0,                                    /* @tp_getattr@ */
 853   0,                                    /* @tp_setattr@ */
 854   0,                                    /* @tp_compare@ */
 855   0,                                    /* @tp_repr@ */
 856   0,                                    /* @tp_as_number@ */
 857   0,                                    /* @tp_as_sequence@ */
 858   0,                                    /* @tp_as_mapping@ */
 859   0,                                    /* @tp_hash@ */
 860   0,                                    /* @tp_call@ */
 861   0,                                    /* @tp_str@ */
 862   0,                                    /* @tp_getattro@ */
 863   0,                                    /* @tp_setattro@ */
 864   0,                                    /* @tp_as_buffer@ */
 865   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 866     Py_TPFLAGS_BASETYPE,
 867
 868   /* @tp_doc@ */
 869   "RSAPriv(..., [rng = rand]): RSA private key.\n"
 870   "  Keywords: n, e, d, p, q, dp, dq, q_inv; must provide enough",
 871
 872   0,                                    /* @tp_traverse@ */
 873   0,                                    /* @tp_clear@ */
 874   0,                                    /* @tp_richcompare@ */
 875   0,                                    /* @tp_weaklistoffset@ */
 876   0,                                    /* @tp_iter@ */
 877   0,                                    /* @tp_iternext@ */
 878   PYMETHODS(rsapriv),                   /* @tp_methods@ */
 879   0,                                    /* @tp_members@ */
 880   PYGETSET(rsapriv),                    /* @tp_getset@ */
 881   0,                                    /* @tp_base@ */
 882   0,                                    /* @tp_dict@ */
 883   0,                                    /* @tp_descr_get@ */
 884   0,                                    /* @tp_descr_set@ */
 885   0,                                    /* @tp_dictoffset@ */
 886   0,                                    /* @tp_init@ */
 887   PyType_GenericAlloc,                  /* @tp_alloc@ */
 888   rsapriv_pynew,                        /* @tp_new@ */
 889   0,                                    /* @tp_free@ */
 890   0                                     /* @tp_is_gc@ */
 891 };
 892
 893 /*----- RSA padding schemes -----------------------------------------------*/
 894
 895 static PyObject *meth__p1crypt_encode(PyObject *me,
 896                                       PyObject *arg, PyObject *kw)
 897 {
 898   pkcs1 p1;
 899   char *m, *ep;
 900   Py_ssize_t msz, epsz;
 901   unsigned long nbits;
 902   PyObject *rc = 0;
 903   octet *b = 0;
 904   size_t sz;
 905   mp *x;
 906   static const char *const kwlist[] = { "msg", "nbits", "ep", "rng", 0 };
 907
 908   p1.r = &rand_global; ep = 0; epsz = 0;
 909   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&|s#O&:encode", KWLIST,
 910                                    &m, &msz, convulong, &nbits,
 911                                    &ep, &epsz, convgrand, &p1.r))
 912     goto end;
 913   sz = (nbits + 7)/8;
 914   p1.ep = ep; p1.epsz = epsz;
 915   if (epsz + msz + 11 > sz) VALERR("buffer underflow");
 916   b = xmalloc(sz);
 917   x = pkcs1_cryptencode(MP_NEW, m, msz, b, sz, nbits, &p1);
 918   rc = mp_pywrap(x);
 919 end:
 920   xfree(b);
 921   return (rc);
 922 }
 923
 924 static PyObject *meth__p1crypt_decode(PyObject *me,
 925                                       PyObject *arg, PyObject *kw)
 926 {
 927   pkcs1 p1;
 928   char *ep;
 929   Py_ssize_t epsz;
 930   unsigned long nbits;
 931   int n;
 932   PyObject *rc = 0;
 933   octet *b = 0;
 934   size_t sz;
 935   mp *x = 0;
 936   static const char *const kwlist[] = { "ct", "nbits", "ep", "rng", 0 };
 937
 938   p1.r = &rand_global; ep = 0; epsz = 0;
 939   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&O&|s#O&:decode", KWLIST,
 940                                    convmp, &x, convulong, &nbits,
 941                                    &ep, &epsz, convgrand, &p1.r))
 942     goto end;
 943   sz = (nbits + 7)/8;
 944   p1.ep = ep; p1.epsz = epsz;
 945   if (epsz + 11 > sz) VALERR("buffer underflow");
 946   b = xmalloc(sz);
 947   if ((n = pkcs1_cryptdecode(x, b, sz, nbits, &p1)) < 0)
 948     VALERR("decryption failed");
 949   rc = bytestring_pywrap(b, n);
 950 end:
 951   mp_drop(x);
 952   xfree(b);
 953   return (rc);
 954 }
 955
 956 static PyObject *meth__p1sig_encode(PyObject *me,
 957                                     PyObject *arg, PyObject *kw)
 958 {
 959   pkcs1 p1;
 960   char *m, *ep;
 961   Py_ssize_t msz, epsz;
 962   unsigned long nbits;
 963   PyObject *rc = 0;
 964   octet *b = 0;
 965   size_t sz;
 966   mp *x;
 967   static const char *const kwlist[] = { "msg", "nbits", "ep", "rng", 0 };
 968
 969   p1.r = &rand_global; ep = 0; epsz = 0;
 970   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&|s#O&:encode", KWLIST,
 971                                    &m, &msz, convulong, &nbits,
 972                                    &ep, &epsz, convgrand, &p1.r))
 973     goto end;
 974   sz = (nbits + 7)/8;
 975   p1.ep = ep; p1.epsz = epsz;
 976   if (epsz + msz + 11 > sz) VALERR("buffer underflow");
 977   b = xmalloc(sz);
 978   x = pkcs1_sigencode(MP_NEW, m, msz, b, sz, nbits, &p1);
 979   rc = mp_pywrap(x);
 980 end:
 981   xfree(b);
 982   return (rc);
 983 }
 984
 985 static PyObject *meth__p1sig_decode(PyObject *me,
 986                                     PyObject *arg, PyObject *kw)
 987 {
 988   pkcs1 p1;
 989   char *ep;
 990   Py_ssize_t epsz;
 991   unsigned long nbits;
 992   int n;
 993   PyObject *hukairz;
 994   PyObject *rc = 0;
 995   octet *b = 0;
 996   size_t sz;
 997   mp *x = 0;
 998   static const char *const kwlist[] =
 999     { "msg", "sig", "nbits", "ep", "rng", 0 };
1000
1001   p1.r = &rand_global; ep = 0; epsz = 0;
1002   if (!PyArg_ParseTupleAndKeywords(arg, kw, "OO&O&|s#O&:decode", KWLIST,
1003                                    &hukairz, convmp, &x, convulong, &nbits,
1004                                    &ep, &epsz, convgrand, &p1.r))
1005     goto end;
1006   sz = (nbits + 7)/8;
1007   p1.ep = ep; p1.epsz = epsz;
1008   if (epsz + 10 > sz) VALERR("buffer underflow");
1009   b = xmalloc(sz);
1010   if ((n = pkcs1_sigdecode(x, 0, 0, b, sz, nbits, &p1)) < 0)
1011     VALERR("verification failed");
1012   rc = bytestring_pywrap(b, n);
1013 end:
1014   mp_drop(x);
1015   xfree(b);
1016   return (rc);
1017 }
1018
1019 static PyObject *meth__oaep_encode(PyObject *me,
1020                                    PyObject *arg, PyObject *kw)
1021 {
1022   oaep o;
1023   char *m, *ep;
1024   Py_ssize_t msz, epsz;
1025   unsigned long nbits;
1026   PyObject *rc = 0;
1027   octet *b = 0;
1028   size_t sz;
1029   mp *x;
1030   static const char *const kwlist[] =
1031     { "msg", "nbits", "mgf", "hash", "ep", "rng", 0 };
1032
1033   o.r = &rand_global; o.cc = &sha_mgf; o.ch = &sha; ep = 0; epsz = 0;
1034   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&|O&O&s#O&:encode", KWLIST,
1035                                    &m, &msz, convulong, &nbits,
1036                                    convgccipher, &o.cc,
1037                                    convgchash, &o.ch,
1038                                    &ep, &epsz,
1039                                    convgrand, &o.r))
1040     goto end;
1041   sz = (nbits + 7)/8;
1042   o.ep = ep; o.epsz = epsz;
1043   if (2 * o.ch->hashsz + 2 + msz > sz) VALERR("buffer underflow");
1044   b = xmalloc(sz);
1045   x = oaep_encode(MP_NEW, m, msz, b, sz, nbits, &o);
1046   rc = mp_pywrap(x);
1047 end:
1048   xfree(b);
1049   return (rc);
1050 }
1051
1052 static PyObject *meth__oaep_decode(PyObject *me,
1053                                    PyObject *arg, PyObject *kw)
1054 {
1055   oaep o;
1056   char *ep;
1057   Py_ssize_t epsz;
1058   unsigned long nbits;
1059   int n;
1060   PyObject *rc = 0;
1061   octet *b = 0;
1062   size_t sz;
1063   mp *x = 0;
1064   static const char *const kwlist[] =
1065     { "ct", "nbits", "mgf", "hash", "ep", "rng", 0 };
1066
1067   o.r = &rand_global; o.cc = &sha_mgf; o.ch = &sha; ep = 0; epsz = 0;
1068   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&O&|O&O&s#O&:decode", KWLIST,
1069                                    convmp, &x, convulong, &nbits,
1070                                    convgccipher, &o.cc,
1071                                    convgchash, &o.ch,
1072                                    &ep, &epsz,
1073                                    convgrand, &o.r))
1074     goto end;
1075   sz = (nbits + 7)/8;
1076   o.ep = ep; o.epsz = epsz;
1077   if (2 * o.ch->hashsz > sz) VALERR("buffer underflow");
1078   b = xmalloc(sz);
1079   if ((n = oaep_decode(x, b, sz, nbits, &o)) < 0)
1080     VALERR("decryption failed");
1081   rc = bytestring_pywrap(b, n);
1082 end:
1083   mp_drop(x);
1084   xfree(b);
1085   return (rc);
1086 }
1087
1088 static PyObject *meth__pss_encode(PyObject *me,
1089                                   PyObject *arg, PyObject *kw)
1090 {
1091   pss p;
1092   char *m;
1093   Py_ssize_t msz;
1094   unsigned long nbits;
1095   PyObject *rc = 0;
1096   octet *b = 0;
1097   size_t sz;
1098   mp *x = 0;
1099   static const char *const kwlist[] =
1100     { "msg", "nbits", "mgf", "hash", "saltsz", "rng", 0 };
1101
1102   p.cc = &sha_mgf; p.ch = &sha; p.r = &rand_global; p.ssz = (size_t)-1;
1103   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&|O&O&O&O&:encode", KWLIST,
1104                                    &m, &msz, convulong, &nbits,
1105                                    convgccipher, &p.cc,
1106                                    convgchash, &p.ch,
1107                                    convszt, &p.ssz,
1108                                    convgrand, &p.r))
1109     goto end;
1110   sz = (nbits + 7)/8;
1111   if (p.ssz == (size_t)-1) p.ssz = p.ch->hashsz;
1112   if (p.ch->hashsz + p.ssz + 2 > sz) VALERR("buffer underflow");
1113   b = xmalloc(sz);
1114   x = pss_encode(MP_NEW, m, msz, b, sz, nbits, &p);
1115   rc = mp_pywrap(x);
1116 end:
1117   xfree(b);
1118   return (rc);
1119 }
1120
1121 static PyObject *meth__pss_decode(PyObject *me,
1122                                   PyObject *arg, PyObject *kw)
1123 {
1124   pss p;
1125   char *m;
1126   Py_ssize_t msz;
1127   unsigned long nbits;
1128   PyObject *rc = 0;
1129   octet *b = 0;
1130   size_t sz;
1131   int n;
1132   mp *x = 0;
1133   static const char *const kwlist[] =
1134     { "msg", "sig", "nbits", "mgf", "hash", "saltsz", "rng", 0 };
1135
1136   p.cc = &sha_mgf; p.ch = &sha; p.r = &rand_global; p.ssz = (size_t)-1;
1137   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&O&|O&O&O&O&:decode", KWLIST,
1138                                    &m, &msz, convmp, &x, convulong, &nbits,
1139                                    convgccipher, &p.cc,
1140                                    convgchash, &p.ch,
1141                                    convszt, &p.ssz,
1142                                    convgrand, &p.r))
1143     goto end;
1144   sz = (nbits + 7)/8;
1145   if (p.ssz == (size_t)-1) p.ssz = p.ch->hashsz;
1146   if (p.ch->hashsz + p.ssz + 2 > sz) VALERR("buffer underflow");
1147   b = xmalloc(sz);
1148   if ((n = pss_decode(x, m, msz, b, sz, nbits, &p)) < 0)
1149     VALERR("verification failed");
1150   rc = Py_None; Py_INCREF(rc);
1151 end:
1152   mp_drop(x);
1153   xfree(b);
1154   return (rc);
1155 }
1156
1157 /*----- X25519 and related algorithms -------------------------------------*/
1158
1159 #define XDHS(_)                                                         \
1160   _(X25519, x25519)                                                     \
1161   _(X448, x448)
1162
1163 #define DEFXDH(X, x)                                                    \
1164   static PyObject *meth_##x(PyObject *me, PyObject *arg)                \
1165   {                                                                     \
1166     const char *k, *p;                                                  \
1167     Py_ssize_t ksz, psz;                                                \
1168     PyObject *rc = 0;                                                   \
1169     if (!PyArg_ParseTuple(arg, "s#s#:" #x, &k, &ksz, &p, &psz))         \
1170       goto end;                                                         \
1171     if (ksz != X##_KEYSZ) VALERR("bad key length");                     \
1172     if (psz != X##_PUBSZ) VALERR("bad public length");                  \
1173     rc = bytestring_pywrap(0, X##_OUTSZ);                               \
1174     x((octet *)PyString_AS_STRING(rc),                                  \
1175       (const octet *)k, (const octet *)p);                              \
1176     return (rc);                                                        \
1177   end:                                                                  \
1178     return (0);                                                         \
1179   }
1180 XDHS(DEFXDH)
1181 #undef DEFXDH
1182
1183 /*----- Ed25519 and related algorithms ------------------------------------*/
1184
1185 #define EDDSAS(_)                                                       \
1186   _(ED25519, ed25519, -1, ctx)                                          \
1187   _(ED448, ed448, 0, )
1188
1189 #define DEFEDDSA(ED, ed, phdflt, sigver)                                \
1190                                                                         \
1191   static PyObject *meth_##ed##_pubkey(PyObject *me, PyObject *arg)      \
1192   {                                                                     \
1193     const char *k;                                                      \
1194     Py_ssize_t ksz;                                                     \
1195     PyObject *rc = 0;                                                   \
1196     if (!PyArg_ParseTuple(arg, "s#:" #ed "_pubkey", &k, &ksz))          \
1197       goto end;                                                         \
1198     rc = bytestring_pywrap(0, ED##_PUBSZ);                              \
1199     ed##_pubkey((octet *)PyString_AS_STRING(rc), k, ksz);               \
1200     return (rc);                                                        \
1201   end:                                                                  \
1202     return (0);                                                         \
1203   }                                                                     \
1204                                                                         \
1205   static PyObject *meth_##ed##_sign(PyObject *me, PyObject *arg,        \
1206                                     PyObject *kw)                       \
1207   {                                                                     \
1208     const char *k, *p = 0, *c = 0, *m;                                  \
1209     Py_ssize_t ksz, psz, csz = 0, msz;                                  \
1210     int ph = phdflt;                                                    \
1211     PyObject *rc = 0;                                                   \
1212     octet pp[ED##_PUBSZ];                                               \
1213     static const char *const kwlist[] =                                 \
1214       { "key", "msg", "pub", "perso", "phflag", 0 };                    \
1215     if (!PyArg_ParseTupleAndKeywords(arg, kw,                           \
1216                                      "s#s#|s#s#O&:" #ed "_sign",        \
1217                                      KWLIST,                            \
1218                                      &k, &ksz, &m, &msz, &p, &psz,      \
1219                                      &c, &csz, convbool, &ph))          \
1220       goto end;                                                         \
1221     if (p && psz != ED##_PUBSZ) VALERR("bad public length");            \
1222     if (c && csz > ED##_MAXPERSOSZ)                                     \
1223       VALERR("personalization string too long");                        \
1224     if (c && ph == -1) ph = 0;                                          \
1225     if (!p) { p = (const char *)pp; ed##_pubkey(pp, k, ksz); }          \
1226     rc = bytestring_pywrap(0, ED##_SIGSZ);                              \
1227     ed##sigver##_sign((octet *)PyString_AS_STRING(rc), k, ksz,          \
1228                       (const octet *)p, ph, c, csz, m, msz);            \
1229     return (rc);                                                        \
1230   end:                                                                  \
1231     return (0);                                                         \
1232   }                                                                     \
1233                                                                         \
1234   static PyObject *meth_##ed##_verify(PyObject *me,                     \
1235                                       PyObject *arg, PyObject *kw)      \
1236   {                                                                     \
1237     const char *p, *c = 0, *m, *s;                                      \
1238     Py_ssize_t psz, csz = 0, msz, ssz;                                  \
1239     int ph = phdflt;                                                    \
1240     PyObject *rc = 0;                                                   \
1241     static const char *const kwlist[] =                                 \
1242       { "pub", "msg", "sig", "perso", "phflag", 0 };                    \
1243     if (!PyArg_ParseTupleAndKeywords(arg, kw,                           \
1244                                      "s#s#s#|s#O&:" #ed "_verify",      \
1245                                      KWLIST,                            \
1246                                      &p, &psz, &m, &msz, &s, &ssz,      \
1247                                      &c, &csz, convbool, &ph))          \
1248       goto end;                                                         \
1249     if (psz != ED##_PUBSZ) VALERR("bad public length");                 \
1250     if (ssz != ED##_SIGSZ) VALERR("bad signature length");              \
1251     if (c && csz > ED##_MAXPERSOSZ)                                     \
1252       VALERR("personalization string too long");                        \
1253     if (c && ph == -1) ph = 0;                                          \
1254     rc = getbool(!ed##sigver##_verify((const octet *)p, ph, c, csz,     \
1255                                       m, msz, (const octet *)s));       \
1256     return (rc);                                                        \
1257   end:                                                                  \
1258     return (0);                                                         \
1259   }
1260 EDDSAS(DEFEDDSA)
1261 #undef DEFEDDSA
1262
1263 /*----- Global stuff ------------------------------------------------------*/
1264
1265 static const PyMethodDef methods[] = {
1266 #define METHNAME(name) meth_##name
1267   KWMETH(_p1crypt_encode, 0)
1268   KWMETH(_p1crypt_decode, 0)
1269   KWMETH(_p1sig_encode, 0)
1270   KWMETH(_p1sig_decode, 0)
1271   KWMETH(_oaep_encode,  0)
1272   KWMETH(_oaep_decode,  0)
1273   KWMETH(_pss_encode,   0)
1274   KWMETH(_pss_decode,   0)
1275 #define DEFMETH(X, x)                                                   \
1276   METH  (x,             "" #x "(KEY, PUBLIC) -> SHARED")
1277   XDHS(DEFMETH)
1278 #undef DEFMETH
1279 #define DEFMETH(ED, ed, phdflt, sigver)                                 \
1280   METH  (ed##_pubkey,   "" #ed "_pubkey(KEY) -> PUBLIC")                \
1281   KWMETH(ed##_sign,     "" #ed "_sign(KEY, MSG, [pub = PUBLIC], "       \
1282                            "[perso = STRING], [phflag = BOOL]) -> SIG") \
1283   KWMETH(ed##_verify,   "" #ed "_verify(PUBLIC, MSG, SIG, "             \
1284                           "[perso = STRING], [phflag = BOOL]) -> BOOL")
1285   EDDSAS(DEFMETH)
1286 #undef DEFMETH
1287 #undef METHNAME
1288   { 0 }
1289 };
1290
1291 void pubkey_pyinit(void)
1292 {
1293   INITTYPE(dsapub, root);
1294   INITTYPE(dsapriv, dsapub);
1295   INITTYPE(kcdsapub, root);
1296   INITTYPE(kcdsapriv, kcdsapub);
1297   INITTYPE(rsapub, root);
1298   INITTYPE(rsapriv, rsapub);
1299   addmethods(methods);
1300 }
1301
1302 void pubkey_pyinsert(PyObject *mod)
1303 {
1304   INSERT("DSAPub", dsapub_pytype);
1305   INSERT("DSAPriv", dsapriv_pytype);
1306   INSERT("KCDSAPub", kcdsapub_pytype);
1307   INSERT("KCDSAPriv", kcdsapriv_pytype);
1308   INSERT("RSAPub", rsapub_pytype);
1309   INSERT("RSAPriv", rsapriv_pytype);
1310 }
1311
1312 /*----- That's all, folks -------------------------------------------------*/