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[catacomb-python] / ec.c
1 /* -*-c-*-
2 *
3 * Elliptic curves
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 /*----- Utility functions -------------------------------------------------*/
32
33 PyTypeObject *ecpt_pytype;
34 PyTypeObject *ecptcurve_pytype;
35 PyTypeObject *eccurve_pytype;
36 PyTypeObject *ecprimecurve_pytype;
37 PyTypeObject *ecprimeprojcurve_pytype;
38 PyTypeObject *ecbincurve_pytype;
39 PyTypeObject *ecbinprojcurve_pytype;
40 PyTypeObject *ecinfo_pytype;
41
42 ec_curve *eccurve_copy(ec_curve *c)
43 {
44 field *f;
45 mp *a, *b;
46
47 if ((f = field_copy(c->f)) == 0)
48 return (0);
49 a = F_OUT(f, MP_NEW, c->a);
50 b = F_OUT(f, MP_NEW, c->b);
51 if (STRCMP(EC_NAME(c), ==, "prime"))
52 c = ec_prime(f, a, b);
53 else if (STRCMP(EC_NAME(c), ==, "primeproj"))
54 c = ec_primeproj(f, a, b);
55 else if (STRCMP(EC_NAME(c), ==, "bin"))
56 c = ec_bin(f, a, b);
57 else if (STRCMP(EC_NAME(c), ==, "binproj"))
58 c = ec_binproj(f, a, b);
59 else
60 c = 0;
61 MP_DROP(a);
62 MP_DROP(b);
63 if (!c) F_DESTROY(f);
64 return (c);
65 }
66
67 static PyObject *ecpt_dopywrap(PyObject *cobj, ec_curve *c, ec *p)
68 {
69 ecpt_pyobj *z = PyObject_New(ecpt_pyobj, (PyTypeObject *)cobj);
70 z->p = *p;
71 z->c = c;
72 Py_INCREF(cobj);
73 return ((PyObject *)z);
74 }
75
76 PyObject *ecpt_pywrap(PyObject *cobj, ec *p)
77 { return (ecpt_dopywrap(cobj, ECCURVE_C(cobj), p)); }
78
79 PyObject *ecpt_pywrapout(void *cobj, ec *p)
80 {
81 ec_curve *c;
82
83 if (!PyType_IsSubtype(cobj, ecptcurve_pytype))
84 c = 0;
85 else {
86 c = ECCURVE_C(cobj);
87 EC_IN(ECCURVE_C(cobj), p, p);
88 }
89 return (ecpt_dopywrap(cobj, c, p));
90 }
91
92 int toecpt(ec_curve *c, ec *d, PyObject *p)
93 {
94 if (ECPTCURVE_PYCHECK(p)) {
95 if (ECPT_C(p) != c && !ec_samep(ECPT_C(p), c))
96 return (-1);
97 EC_COPY(d, ECPT_P(p));
98 } else if (ECPT_PYCHECK(p))
99 EC_IN(c, d, ECPT_P(p));
100 else
101 return (-1);
102 return (0);
103 }
104
105 int getecpt(ec_curve *c, ec *d, PyObject *p)
106 {
107 if (toecpt(c, d, p)) {
108 PyErr_Format(PyExc_TypeError, "can't convert %.100s to ecpt",
109 Py_TYPE(p)->tp_name);
110 return (-1);
111 }
112 return (0);
113 }
114
115 void getecptout(ec *d, PyObject *p)
116 {
117 if (ECPTCURVE_PYCHECK(p))
118 EC_OUT(ECPT_C(p), d, ECPT_P(p));
119 else {
120 assert(ECPT_PYCHECK(p));
121 EC_COPY(d, ECPT_P(p));
122 }
123 }
124
125 int convecpt(PyObject *o, void *p)
126 {
127 if (!ECPT_PYCHECK(o))
128 TYERR("want elliptic curve point");
129 getecptout(p, o);
130 return (1);
131 end:
132 return (0);
133 }
134
135 /*----- Curve points ------------------------------------------------------*/
136
137 static int ecbinop(PyObject *x, PyObject *y,
138 ec_curve **c, PyObject **cobj, ec *xx, ec *yy)
139 {
140 if (ECPTCURVE_PYCHECK(x)) *cobj = ECPT_COBJ(x);
141 else if (ECPTCURVE_PYCHECK(y)) *cobj = ECPT_COBJ(y);
142 else return (-1);
143 *c = ECCURVE_C(*cobj);
144 if (toecpt(*c, xx, x) || toecpt(*c, yy, y)) return (-1);
145 return (0);
146 }
147
148 #define BINOP(name) \
149 static PyObject *ecpt_py##name(PyObject *x, PyObject *y) { \
150 ec xx = EC_INIT, yy = EC_INIT, zz = EC_INIT; \
151 PyObject *cobj; \
152 ec_curve *c; \
153 if (ecbinop(x, y, &c, &cobj, &xx, &yy)) RETURN_NOTIMPL; \
154 c->ops->name(c, &zz, &xx, &yy); \
155 EC_DESTROY(&xx); EC_DESTROY(&yy); \
156 return (ecpt_pywrap(ECPT_COBJ(x), &zz)); \
157 }
158 BINOP(add)
159 BINOP(sub)
160 #undef BINOP
161
162 #define UNOP(name) \
163 static PyObject *ecpt_py##name(PyObject *x) { \
164 ec zz = EC_INIT; \
165 ec_curve *c = ECPT_C(x); \
166 c->ops->name(c, &zz, ECPT_P(x)); \
167 return (ecpt_pywrap(ECPT_COBJ(x), &zz)); \
168 }
169 UNOP(neg)
170 #undef UNOP
171
172 static PyObject *ecpt_pyid(PyObject *x) { RETURN_OBJ(x); }
173
174 static int ecpt_pynonzerop(PyObject *x) { return (!EC_ATINF(ECPT_P(x))); }
175
176 static void ecpt_pydealloc(PyObject *x)
177 {
178 EC_DESTROY(ECPT_P(x));
179 Py_DECREF(ECPT_COBJ(x));
180 FREEOBJ(x);
181 }
182
183 static PyObject *ecpt_pymul(PyObject *x, PyObject *y)
184 {
185 mp *xx;
186 ec zz = EC_INIT;
187
188 if (ECPT_PYCHECK(x)) { PyObject *t; t = x; x = y; y = t; }
189 if (!ECPT_PYCHECK(y)) RETURN_NOTIMPL;
190 if (FE_PYCHECK(x) && FE_F(x)->ops->ty == FTY_PRIME)
191 xx = F_OUT(FE_F(x), MP_NEW, FE_X(x));
192 else if ((xx = implicitmp(x)) == 0)
193 RETURN_NOTIMPL;
194 ec_imul(ECPT_C(y), &zz, ECPT_P(y), xx);
195 MP_DROP(xx);
196 return (ecpt_pywrap(ECPT_COBJ(y), &zz));
197 }
198
199 static Py_hash_t ecpt_pyhash(PyObject *me)
200 {
201 uint32 h;
202 ec p = EC_INIT;
203
204 getecptout(&p, me);
205 if (EC_ATINF(&p)) h = 0x81d81a94;
206 else h = 0xe0fdd039 ^ (2*mphash(p.x)) ^ (3*mphash(p.y));
207 EC_DESTROY(&p);
208 return (h%LONG_MAX);
209 }
210
211 static PyObject *ecpt_pyrichcompare(PyObject *x, PyObject *y, int op)
212 {
213 ec p = EC_INIT, q = EC_INIT;
214 int b;
215 PyObject *rc = 0;
216
217 if (!ECPT_PYCHECK(y)) RETURN_NOTIMPL;
218 getecptout(&p, x);
219 getecptout(&q, y);
220 switch (op) {
221 case Py_EQ: b = EC_EQ(&p, &q); break;
222 case Py_NE: b = !EC_EQ(&p, &q); break;
223 default: TYERR("elliptic curve points are unordered");
224 }
225 rc = getbool(b);
226 end:
227 EC_DESTROY(&p);
228 EC_DESTROY(&q);
229 return (rc);
230 }
231
232 static PyObject *epmeth_oncurvep(PyObject *me)
233 {
234 return (getbool(EC_ATINF(ECPT_P(me)) ||
235 !EC_CHECK(ECPT_C(me), ECPT_P(me))));
236 }
237
238 static PyObject *epmeth_dbl(PyObject *me)
239 {
240 ec p = EC_INIT;
241 EC_DBL(ECPT_C(me), &p, ECPT_P(me));
242 return (ecpt_pywrap(ECPT_COBJ(me), &p));
243 }
244
245 static PyObject *epmeth_tobuf(PyObject *me)
246 {
247 buf b;
248 ec p = EC_INIT;
249 PyObject *rc;
250 size_t n;
251
252 getecptout(&p, me);
253 if (EC_ATINF(&p))
254 n = 2;
255 else
256 n = mp_octets(p.x) + mp_octets(p.y) + 6;
257 rc = bytestring_pywrap(0, n);
258 buf_init(&b, BIN_PTR(rc), n);
259 buf_putec(&b, &p);
260 assert(BOK(&b));
261 BIN_SETLEN(rc, BLEN(&b));
262 EC_DESTROY(&p);
263 return (rc);
264 }
265
266 static PyObject *epmeth_toraw(PyObject *me)
267 {
268 buf b;
269 PyObject *rc;
270 char *p;
271 ec_curve *c = ECPT_C(me);
272 ec pp = EC_INIT;
273 int len;
274
275 len = c->f->noctets * 2 + 1;
276 rc = bytestring_pywrap(0, len);
277 p = BIN_PTR(rc);
278 buf_init(&b, p, len);
279 EC_OUT(c, &pp, ECPT_P(me));
280 ec_putraw(c, &b, &pp);
281 EC_DESTROY(&pp);
282 BIN_SETLEN(rc, BLEN(&b));
283 return (rc);
284 }
285
286 static PyObject *epmeth_ec2osp(PyObject *me, PyObject *arg, PyObject *kw)
287 {
288 buf b;
289 PyObject *rc;
290 char *p;
291 ec_curve *c = ECPT_C(me);
292 ec pp = EC_INIT;
293 unsigned f = EC_EXPLY;
294 int len;
295 static const char *const kwlist[] = { "flags", 0 };
296
297 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:ec2osp", KWLIST,
298 convuint, &f))
299 return (0);
300 len = c->f->noctets * 2 + 1;
301 rc = bytestring_pywrap(0, len);
302 p = BIN_PTR(rc);
303 buf_init(&b, p, len);
304 EC_OUT(c, &pp, ECPT_P(me));
305 if (ec_ec2osp(c, f, &b, &pp)) {
306 Py_DECREF(rc); rc = 0;
307 VALERR("invalid flags");
308 }
309 EC_DESTROY(&pp);
310 BIN_SETLEN(rc, BLEN(&b));
311 end:
312 return (rc);
313 }
314
315 static PyObject *epmeth_frombuf(PyObject *me, PyObject *arg)
316 {
317 struct bin in;
318 buf b;
319 PyObject *rc = 0;
320 ec pp = EC_INIT;
321
322 if (!PyArg_ParseTuple(arg, "O&:frombuf", convbin, &in)) goto end;
323 buf_init(&b, (/*unconst*/ void *)in.p, in.sz);
324 if (buf_getec(&b, &pp)) VALERR("malformed data");
325 rc = Py_BuildValue("(NN)", ecpt_pywrapout(me, &pp),
326 bytestring_pywrapbuf(&b));
327 end:
328 return (rc);
329 }
330
331 static PyObject *epmeth_parse(PyObject *me, PyObject *arg)
332 {
333 char *p;
334 qd_parse qd;
335 PyObject *rc = 0;
336 int paren;
337 ec pp = EC_INIT;
338
339 if (!PyArg_ParseTuple(arg, "s:parse", &p)) goto end;
340 qd.p = p; qd.e = 0;
341 qd_skipspc(&qd); paren = qd_delim(&qd, '(');
342 if (!ec_ptparse(&qd, &pp)) VALERR(qd.e);
343 qd_skipspc(&qd); if (paren && !qd_delim(&qd, ')'))
344 { EC_DESTROY(&pp); VALERR("missing `)'"); }
345 rc = Py_BuildValue("(Ns)", ecpt_pywrapout(me, &pp), qd.p);
346 end:
347 return (rc);
348 }
349
350 static PyObject *epmeth_fromraw(PyObject *me, PyObject *arg)
351 {
352 struct bin in;
353 buf b;
354 PyObject *rc = 0;
355 ec_curve *cc;
356 ec pp = EC_INIT;
357
358 if (!PyArg_ParseTuple(arg, "O&:fromraw", convbin, &in)) return (0);
359 buf_init(&b, (/*unconst*/ void *)in.p, in.sz);
360 cc = ECCURVE_C(me);
361 if (ec_getraw(cc, &b, &pp))
362 VALERR("bad point");
363 EC_IN(cc, &pp, &pp);
364 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
365 end:
366 return (rc);
367 }
368
369 static PyObject *epmeth_os2ecp(PyObject *me, PyObject *arg, PyObject *kw)
370 {
371 struct bin in;
372 buf b;
373 PyObject *rc = 0;
374 ec_curve *cc;
375 unsigned f = EC_XONLY | EC_LSB | EC_SORT | EC_EXPLY;
376 ec pp = EC_INIT;
377 static const char *const kwlist[] = { "buf", "flags", 0 };
378
379 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&|O&:os2ecp", KWLIST,
380 convbin, &in, convuint, &f))
381 return (0);
382 buf_init(&b, (/*unconst*/ void *)in.p, in.sz);
383 cc = ECCURVE_C(me);
384 if (ec_os2ecp(cc, f, &b, &pp)) VALERR("bad point");
385 EC_IN(cc, &pp, &pp);
386 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
387 end:
388 return (rc);
389 }
390
391 static PyObject *epncget_ix(PyObject *me, void *hunoz)
392 {
393 ec p = EC_INIT;
394 PyObject *rc;
395 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
396 getecptout(&p, me);
397 rc = mp_pywrap(MP_COPY(p.x));
398 EC_DESTROY(&p);
399 return (rc);
400 }
401
402 static PyObject *epncget_iy(PyObject *me, void *hunoz)
403 {
404 ec p = EC_INIT;
405 PyObject *rc;
406 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
407 getecptout(&p, me);
408 rc = mp_pywrap(MP_COPY(p.y));
409 EC_DESTROY(&p);
410 return (rc);
411 }
412
413 static PyObject *epncget_point(PyObject *me, void *hunoz)
414 { RETURN_ME; }
415
416 static PyObject *epget_point(PyObject *me, void *hunoz)
417 {
418 ec p = EC_INIT;
419 getecptout(&p, me);
420 return (ecpt_pywrapout(ecpt_pytype, &p));
421 }
422
423 static PyObject *epget_x(PyObject *me, void *hunoz)
424 {
425 ec_curve *c = ECPT_C(me);
426 ec *pp = ECPT_P(me);
427 PyObject *fobj = ECPT_FOBJ(me);
428 ec p = EC_INIT;
429 PyObject *rc;
430
431 if (EC_ATINF(pp)) RETURN_NONE;
432 EC_OUT(c, &p, pp);
433 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.x));
434 EC_DESTROY(&p);
435 return (rc);
436 }
437
438 static PyObject *epget_y(PyObject *me, void *hunoz)
439 {
440 ec_curve *c = ECPT_C(me);
441 ec *pp = ECPT_P(me);
442 PyObject *fobj = ECPT_FOBJ(me);
443 ec p = EC_INIT;
444 PyObject *rc;
445
446 if (EC_ATINF(pp)) RETURN_NONE;
447 EC_OUT(c, &p, pp);
448 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.y));
449 EC_DESTROY(&p);
450 return (rc);
451 }
452
453 static PyObject *epget__x(PyObject *me, void *hunoz)
454 {
455 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
456 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->x)));
457 }
458
459 static PyObject *epget__y(PyObject *me, void *hunoz)
460 {
461 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
462 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->y)));
463 }
464
465 static PyObject *epget__z(PyObject *me, void *hunoz)
466 {
467 if (EC_ATINF(ECPT_P(me)) || !ECPT_P(me)->z) RETURN_NONE;
468 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->z)));
469 }
470
471 static mp *coord_in(field *f, PyObject *x)
472 {
473 mp *xx;
474 if (FE_PYCHECK(x) && (FE_F(x) == f || field_samep(FE_F(x), f)))
475 return (MP_COPY(FE_X(x)));
476 else if ((xx = getmp(x)) == 0)
477 return (0);
478 else
479 return (F_IN(f, xx, xx));
480 }
481
482 static int ecptxl_3(ec_curve *c, ec *p,
483 PyObject *x, PyObject *y, PyObject *z)
484 {
485 int rc = -1;
486
487 if (!x || !y || !z) TYERR("missing argument");
488 if (!c) VALERR("internal form with no curve!");
489 if ((p->x = coord_in(c->f, x)) == 0 ||
490 (p->y = coord_in(c->f, y)) == 0 ||
491 (z != Py_None && (p->z = coord_in(c->f, z)) == 0))
492 goto end;
493 if (!p->z) p->z = MP_COPY(c->f->one); /* just in case */
494 rc = 0;
495 end:
496 return (rc);
497 }
498
499 static int ecptxl_2(ec_curve *c, ec *p, PyObject *x, PyObject *y)
500 {
501 int rc = -1;
502
503 if (!x || !y) TYERR("missing argument");
504 if ((p->x = getmp(x)) == 0 ||
505 (p->y = getmp(y)) == 0)
506 goto end;
507 if (c) EC_IN(c, p, p);
508 rc = 0;
509 end:
510 return (rc);
511 }
512
513 static int ecptxl_1(ec_curve *c, ec *p, PyObject *x)
514 {
515 int rc = -1;
516 PyObject *y = 0, *z = 0, *t = 0;
517 mp *xx = 0;
518 Py_ssize_t n;
519 qd_parse qd;
520 int paren;
521
522 Py_XINCREF(x);
523 if (!x || x == Py_None)
524 /*cool*/;
525 else if (ECPT_PYCHECK(x)) {
526 getecptout(p, x);
527 goto fix;
528 } else if (TEXT_CHECK(x)) {
529 qd.p = TEXT_PTR(x); qd.e = 0;
530 qd_skipspc(&qd); paren = qd_delim(&qd, '(');
531 if (!ec_ptparse(&qd, p)) VALERR(qd.e);
532 qd_skipspc(&qd); if (paren && !qd_delim(&qd, ')'))
533 { EC_DESTROY(p); VALERR("missing `)'"); }
534 qd_skipspc(&qd); if (!qd_eofp(&qd)) VALERR("junk at eof");
535 goto fix;
536 } else if (c && (xx = tomp(x)) != 0) {
537 xx = F_IN(c->f, xx, xx);
538 if (!EC_FIND(c, p, xx)) VALERR("not on the curve");
539 } else if (PySequence_Check(x)) {
540 t = x; x = 0;
541 n = PySequence_Size(t); if (n < 0) goto end;
542 if (n != 2 && n != 3)
543 TYERR("want sequence of two or three items");
544 if ((x = PySequence_GetItem(t, 0)) == 0 ||
545 (y = PySequence_GetItem(t, 1)) == 0 ||
546 (n == 3 && (z = PySequence_GetItem(t, 2)) == 0))
547 goto end;
548 rc = (n == 2) ? ecptxl_2(c, p, x, y) : ecptxl_3(c, p, x, y, z);
549 goto end;
550 } else
551 TYERR("can't convert to curve point");
552 goto ok;
553
554 fix:
555 if (c) EC_IN(c, p, p);
556 ok:
557 rc = 0;
558 end:
559 Py_XDECREF(x); Py_XDECREF(y); Py_XDECREF(z); Py_XDECREF(t);
560 mp_drop(xx);
561 return (rc);
562 }
563
564 static int ecptxl(ec_curve *c, ec *p, PyObject *x, PyObject *y, PyObject *z)
565 {
566 if (z)
567 return (ecptxl_3(c, p, x, y, z));
568 else if (y)
569 return (ecptxl_2(c, p, x, y));
570 else
571 return (ecptxl_1(c, p, x));
572 }
573
574 static PyObject *ecptnc_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
575 {
576 PyObject *x = 0, *y = 0, *z = 0;
577 ec p = EC_INIT;
578 static const char *const kwlist[] = { "x", "y", 0 };
579
580 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OO:new", KWLIST, &x, &y) ||
581 ecptxl(0, &p, x, y, z))
582 goto end;
583 return (ecpt_pywrapout(ty, &p));
584 end:
585 mp_drop(p.x); mp_drop(p.y); mp_drop(p.z);
586 return (0);
587 }
588
589 static PyObject *ecpt_pyint(PyObject *me)
590 {
591 ec p = EC_INIT;
592 long l;
593 PyObject *rc = 0;
594 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
595 getecptout(&p, me);
596 if (!mp_tolong_checked(p.x, &l, 0)) rc = PyInt_FromLong(l);
597 else rc = mp_topylong(p.x);
598 end:
599 EC_DESTROY(&p);
600 return (rc);
601 }
602
603 #ifdef PY2
604 static PyObject *ecpt_pylong(PyObject *me)
605 {
606 ec p = EC_INIT;
607 PyObject *rc = 0;
608 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
609 getecptout(&p, me);
610 rc = mp_topylong(p.x);
611 end:
612 EC_DESTROY(&p);
613 return (rc);
614 }
615 #endif
616
617 static PyObject *ecpt_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
618 {
619 PyObject *x = 0, *y = 0, *z = 0;
620 ec p = EC_INIT;
621 static const char *const kwlist[] = { "x", "y", "z", 0 };
622
623 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OOO:new", KWLIST,
624 &x, &y, &z) ||
625 ecptxl(ECCURVE_C(ty), &p, x, y, z))
626 goto end;
627 return (ecpt_pywrap((PyObject *)ty, &p));
628 end:
629 mp_drop(p.x); mp_drop(p.y); mp_drop(p.z);
630 return (0);
631 }
632
633 static const PyGetSetDef ecptnc_pygetset[] = {
634 #define GETSETNAME(op, name) epnc##op##_##name
635 GET (ix, "P.ix -> integer x coordinate of P")
636 GET (iy, "P.iy -> integer y coordinate of P")
637 GET (point, "P.point -> standalone curve point (no-op)")
638 #undef GETSETNAME
639 { 0 }
640 };
641
642 static const PyMethodDef ecptnc_pymethods[] = {
643 #define METHNAME(func) epmeth_##func
644 NAMETH(tobuf, "X.tobuf() -> BIN")
645 CMTH (frombuf, "frombuf(STR) -> (P, REST)")
646 CMTH (parse, "parse(STR) -> (P, REST)")
647 #undef METHNAME
648 { 0 }
649 };
650
651 static const PyNumberMethods ecpt_pynumber = {
652 0, /* @nb_add@ */
653 0, /* @nb_subtract@ */
654 0, /* @nb_multiply@ */
655 #ifdef PY2
656 0, /* @nb_divide@ */
657 #endif
658 0, /* @nb_remainder@ */
659 0, /* @nb_divmod@ */
660 0, /* @nb_power@ */
661 0, /* @nb_negative@ */
662 0, /* @nb_positive@ */
663 0, /* @nb_absolute@ */
664 ecpt_pynonzerop, /* @nb_nonzero@ */
665 0, /* @nb_invert@ */
666 0, /* @nb_lshift@ */
667 0, /* @nb_rshift@ */
668 0, /* @nb_and@ */
669 0, /* @nb_xor@ */
670 0, /* @nb_or@ */
671 #ifdef PY2
672 0, /* @nb_coerce@ */
673 #endif
674 ecpt_pyint, /* @nb_int@ */
675 PY23(ecpt_pylong, 0), /* @nb_long@ */
676 0, /* @nb_float@ */
677 #ifdef PY2
678 0, /* @nb_oct@ */
679 0, /* @nb_hex@ */
680 #endif
681
682 0, /* @nb_inplace_add@ */
683 0, /* @nb_inplace_subtract@ */
684 0, /* @nb_inplace_multiply@ */
685 #ifdef PY2
686 0, /* @nb_inplace_divide@ */
687 #endif
688 0, /* @nb_inplace_remainder@ */
689 0, /* @nb_inplace_power@ */
690 0, /* @nb_inplace_lshift@ */
691 0, /* @nb_inplace_rshift@ */
692 0, /* @nb_inplace_and@ */
693 0, /* @nb_inplace_xor@ */
694 0, /* @nb_inplace_or@ */
695
696 0, /* @nb_floor_divide@ */
697 0, /* @nb_true_divide@ */
698 0, /* @nb_inplace_floor_divide@ */
699 0, /* @nb_inplace_true_divide@ */
700 };
701
702 static const PyTypeObject ecpt_pytype_skel = {
703 PyVarObject_HEAD_INIT(0, 0) /* Header */
704 "ECPt", /* @tp_name@ */
705 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
706 0, /* @tp_itemsize@ */
707
708 ecpt_pydealloc, /* @tp_dealloc@ */
709 0, /* @tp_print@ */
710 0, /* @tp_getattr@ */
711 0, /* @tp_setattr@ */
712 0, /* @tp_compare@ */
713 0, /* @tp_repr@ */
714 PYNUMBER(ecpt), /* @tp_as_number@ */
715 0, /* @tp_as_sequence@ */
716 0, /* @tp_as_mapping@ */
717 ecpt_pyhash, /* @tp_hash@ */
718 0, /* @tp_call@ */
719 0, /* @tp_str@ */
720 0, /* @tp_getattro@ */
721 0, /* @tp_setattro@ */
722 0, /* @tp_as_buffer@ */
723 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
724 Py_TPFLAGS_CHECKTYPES |
725 Py_TPFLAGS_BASETYPE,
726
727 /* @tp_doc@ */
728 "ECPt([X, [Y]]): elliptic curve points, not associated with any curve.\n"
729 " X alone may be None, an existing point, a string 'X, Y', an\n"
730 " x-coordinate, or a pair (X, Y); X and Y should be a coordinate pair.",
731
732 0, /* @tp_traverse@ */
733 0, /* @tp_clear@ */
734 ecpt_pyrichcompare, /* @tp_richcompare@ */
735 0, /* @tp_weaklistoffset@ */
736 0, /* @tp_iter@ */
737 0, /* @tp_iternext@ */
738 PYMETHODS(ecptnc), /* @tp_methods@ */
739 0, /* @tp_members@ */
740 PYGETSET(ecptnc), /* @tp_getset@ */
741 0, /* @tp_base@ */
742 0, /* @tp_dict@ */
743 0, /* @tp_descr_get@ */
744 0, /* @tp_descr_set@ */
745 0, /* @tp_dictoffset@ */
746 0, /* @tp_init@ */
747 PyType_GenericAlloc, /* @tp_alloc@ */
748 ecptnc_pynew, /* @tp_new@ */
749 0, /* @tp_free@ */
750 0 /* @tp_is_gc@ */
751 };
752
753 static const PyMemberDef ecpt_pymembers[] = {
754 #define MEMBERSTRUCT ecpt_pyobj
755 MEMRNM(curve, T_OBJECT, PY23(ob_type, ob_base.ob_type), READONLY,
756 "P.curve -> elliptic curve containing P")
757 #undef MEMBERSTRUCT
758 { 0 }
759 };
760
761 static const PyGetSetDef ecpt_pygetset[] = {
762 #define GETSETNAME(op, name) ep##op##_##name
763 GET (point, "P.point -> standalone curve point")
764 GET (x, "P.x -> Cartesian x coordinate of P")
765 GET (y, "P.y -> Cartesian y coordinate of P")
766 GET (_x, "P._x -> internal x coordinate of P")
767 GET (_y, "P._y -> internal y coordinate of P")
768 GET (_z, "P._z -> internal z coordinate of P, or None")
769 #undef GETSETNAME
770 { 0 }
771 };
772
773 static const PyMethodDef ecpt_pymethods[] = {
774 #define METHNAME(func) epmeth_##func
775 NAMETH(toraw, "X.toraw() -> BIN")
776 KWMETH(ec2osp, "X.ec2osp([flags = EC_EXPLY]) -> BIN")
777 NAMETH(dbl, "X.dbl() -> X + X")
778 NAMETH(oncurvep, "X.oncurvep() -> BOOL")
779 CMTH (fromraw, "fromraw(STR) -> (P, REST)")
780 KWCMTH(os2ecp, "os2ecp(STR, [flags = ...]) -> (P, REST)")
781 #undef METHNAME
782 { 0 }
783 };
784
785 static const PyNumberMethods ecptcurve_pynumber = {
786 ecpt_pyadd, /* @nb_add@ */
787 ecpt_pysub, /* @nb_subtract@ */
788 ecpt_pymul, /* @nb_multiply@ */
789 #ifdef PY2
790 0, /* @nb_divide@ */
791 #endif
792 0, /* @nb_remainder@ */
793 0, /* @nb_divmod@ */
794 0, /* @nb_power@ */
795 ecpt_pyneg, /* @nb_negative@ */
796 ecpt_pyid, /* @nb_positive@ */
797 0, /* @nb_absolute@ */
798 0, /* @nb_nonzero@ */
799 0, /* @nb_invert@ */
800 0, /* @nb_lshift@ */
801 0, /* @nb_rshift@ */
802 0, /* @nb_and@ */
803 0, /* @nb_xor@ */
804 0, /* @nb_or@ */
805 #ifdef PY2
806 0, /* @nb_coerce@ */
807 #endif
808 0, /* @nb_int@ */
809 0, /* @nb_long@ */
810 0, /* @nb_float@ */
811 #ifdef PY2
812 0, /* @nb_oct@ */
813 0, /* @nb_hex@ */
814 #endif
815
816 0, /* @nb_inplace_add@ */
817 0, /* @nb_inplace_subtract@ */
818 0, /* @nb_inplace_multiply@ */
819 0, /* @nb_inplace_divide@ */
820 0, /* @nb_inplace_remainder@ */
821 0, /* @nb_inplace_power@ */
822 0, /* @nb_inplace_lshift@ */
823 0, /* @nb_inplace_rshift@ */
824 0, /* @nb_inplace_and@ */
825 0, /* @nb_inplace_xor@ */
826 0, /* @nb_inplace_or@ */
827
828 0, /* @nb_floor_divide@ */
829 0, /* @nb_true_divide@ */
830 0, /* @nb_inplace_floor_divide@ */
831 0, /* @nb_inplace_true_divide@ */
832 };
833
834 static const PyTypeObject ecptcurve_pytype_skel = {
835 PyVarObject_HEAD_INIT(0, 0) /* Header */
836 "ECPtCurve", /* @tp_name@ */
837 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
838 0, /* @tp_itemsize@ */
839
840 ecpt_pydealloc, /* @tp_dealloc@ */
841 0, /* @tp_print@ */
842 0, /* @tp_getattr@ */
843 0, /* @tp_setattr@ */
844 0, /* @tp_compare@ */
845 0, /* @tp_repr@ */
846 PYNUMBER(ecptcurve), /* @tp_as_number@ */
847 0, /* @tp_as_sequence@ */
848 0, /* @tp_as_mapping@ */
849 0, /* @tp_hash@ */
850 0, /* @tp_call@ */
851 0, /* @tp_str@ */
852 0, /* @tp_getattro@ */
853 0, /* @tp_setattro@ */
854 0, /* @tp_as_buffer@ */
855 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
856 Py_TPFLAGS_CHECKTYPES |
857 Py_TPFLAGS_BASETYPE,
858
859 /* @tp_doc@ */
860 "Elliptic curve points; abstract base class for points on given curves.",
861
862 0, /* @tp_traverse@ */
863 0, /* @tp_clear@ */
864 0, /* @tp_richcompare@ */
865 0, /* @tp_weaklistoffset@ */
866 0, /* @tp_iter@ */
867 0, /* @tp_iternext@ */
868 PYMETHODS(ecpt), /* @tp_methods@ */
869 PYMEMBERS(ecpt), /* @tp_members@ */
870 PYGETSET(ecpt), /* @tp_getset@ */
871 0, /* @tp_base@ */
872 0, /* @tp_dict@ */
873 0, /* @tp_descr_get@ */
874 0, /* @tp_descr_set@ */
875 0, /* @tp_dictoffset@ */
876 0, /* @tp_init@ */
877 PyType_GenericAlloc, /* @tp_alloc@ */
878 abstract_pynew, /* @tp_new@ */
879 0, /* @tp_free@ */
880 0 /* @tp_is_gc@ */
881 };
882
883 /*----- Elliptic curves themselves ----------------------------------------*/
884
885 static PyObject *eccurve_pyrichcompare(PyObject *x, PyObject *y, int op)
886 {
887 int b;
888
889 assert(ECCURVE_PYCHECK(x));
890 if (!ECCURVE_PYCHECK(y)) RETURN_NOTIMPL;
891 b = ec_samep(ECCURVE_C(x), ECCURVE_C(y));
892 switch (op) {
893 case Py_EQ: break;
894 case Py_NE: b = !b; break;
895 default: TYERR("can't order elliptic curves");
896 }
897 return (getbool(b));
898 end:
899 return (0);
900 }
901
902 static PyObject *ecmmul_id(PyObject *me)
903 { ec p = EC_INIT; return (ecpt_pywrap(me, &p)); }
904
905 static int ecmmul_fill(void *pp, PyObject *me, PyObject *x, PyObject *m)
906 {
907 ec_mulfactor *f = pp;
908
909 EC_CREATE(&f->base);
910 if (getecpt(ECCURVE_C(me), &f->base, x) ||
911 (f->exp = getmp(m)) == 0)
912 return (-1);
913 return (0);
914 }
915
916 static PyObject *ecmmul_exp(PyObject *me, void *pp, int n)
917 {
918 ec p = EC_INIT;
919 ec_immul(ECCURVE_C(me), &p, pp, n);
920 return (ecpt_pywrap(me, &p));
921 }
922
923 static void ecmmul_drop(void *pp)
924 {
925 ec_mulfactor *f = pp;
926 EC_DESTROY(&f->base);
927 MP_DROP(f->exp);
928 }
929
930 static PyObject *ecmeth_mmul(PyObject *me, PyObject *arg)
931 {
932 return (mexp_common(me, arg, sizeof(ec_mulfactor),
933 ecmmul_id, ecmmul_fill, ecmmul_exp, ecmmul_drop));
934 }
935
936 static void eccurve_pydealloc(PyObject *me)
937 {
938 ec_destroycurve(ECCURVE_C(me));
939 Py_DECREF(ECCURVE_FOBJ(me));
940 PyType_Type.tp_dealloc(me);
941 }
942
943 static PyObject *ecmeth_find(PyObject *me, PyObject *arg)
944 {
945 PyObject *x;
946 mp *xx = 0;
947 ec p = EC_INIT;
948 PyObject *rc = 0;
949
950 if (!PyArg_ParseTuple(arg, "O:find", &x)) goto end;
951 if (FIELD_PYCHECK(x) && FE_F(x) == ECCURVE_C(me)->f)
952 xx = MP_COPY(FE_X(x));
953 else if ((xx = getmp(x)) == 0)
954 goto end;
955 else
956 xx = F_IN(ECCURVE_C(me)->f, xx, xx);
957 if (EC_FIND(ECCURVE_C(me), &p, xx) == 0)
958 VALERR("not on the curve");
959 rc = ecpt_pywrap(me, &p);
960 end:
961 if (xx) MP_DROP(xx);
962 return (rc);
963 }
964
965 static PyObject *ecmeth_rand(PyObject *me, PyObject *arg, PyObject *kw)
966 {
967 static const char *const kwlist[] = { "rng", 0 };
968 grand *r = &rand_global;
969 ec p = EC_INIT;
970
971 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:rand", KWLIST,
972 convgrand, &r))
973 return (0);
974 ec_rand(ECCURVE_C(me), &p, r);
975 EC_IN(ECCURVE_C(me), &p, &p);
976 return (ecpt_pywrap(me, &p));
977 }
978
979 static PyObject *ecmeth_parse(PyObject *me, PyObject *arg)
980 {
981 char *p;
982 qd_parse qd;
983 ec_curve *c;
984 PyObject *rc = 0;
985
986 if (!PyArg_ParseTuple(arg, "s:parse", &p)) goto end;
987 qd.p = p; qd.e = 0;
988 if ((c = ec_curveparse(&qd)) == 0) VALERR(qd.e);
989 rc = Py_BuildValue("(Ns)", eccurve_pywrap(0, c), qd.p);
990 end:
991 return (rc);
992 }
993
994 static PyObject *eccurve_dopywrap(PyTypeObject *ty,
995 PyObject *fobj, ec_curve *c)
996 {
997 eccurve_pyobj *cobj = newtype(ty, 0, c->ops->name);
998 cobj->c = c;
999 cobj->fobj = fobj;
1000 cobj->ty.ht_type.tp_basicsize = sizeof(ecpt_pyobj);
1001 cobj->ty.ht_type.tp_base = ecptcurve_pytype;
1002 Py_INCREF(ecptcurve_pytype);
1003 cobj->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
1004 Py_TPFLAGS_BASETYPE |
1005 Py_TPFLAGS_CHECKTYPES |
1006 Py_TPFLAGS_HEAPTYPE);
1007 cobj->ty.ht_type.tp_alloc = PyType_GenericAlloc;
1008 cobj->ty.ht_type.tp_free = 0;
1009 cobj->ty.ht_type.tp_new = ecpt_pynew;
1010 typeready(&cobj->ty.ht_type);
1011 return ((PyObject *)cobj);
1012 }
1013
1014 PyObject *eccurve_pywrap(PyObject *fobj, ec_curve *c)
1015 {
1016 PyTypeObject *ty;
1017
1018 if (!fobj)
1019 fobj = field_pywrap(c->f);
1020 else
1021 Py_INCREF(fobj);
1022 assert(FIELD_F(fobj) == c->f);
1023 if (STRCMP(EC_NAME(c), ==, "prime"))
1024 ty = ecprimecurve_pytype;
1025 else if (STRCMP(EC_NAME(c), ==, "primeproj"))
1026 ty = ecprimeprojcurve_pytype;
1027 else if (STRCMP(EC_NAME(c), ==, "bin"))
1028 ty = ecbincurve_pytype;
1029 else if (STRCMP(EC_NAME(c), ==, "binproj"))
1030 ty = ecbinprojcurve_pytype;
1031 else
1032 abort();
1033 return (eccurve_dopywrap(ty, fobj, c));
1034 }
1035
1036 static PyObject *eccurve_pynew(PyTypeObject *ty,
1037 ec_curve *(*make)(field *, mp *, mp *),
1038 PyObject *arg, PyObject *kw)
1039 {
1040 PyObject *fobj;
1041 PyObject *cobj = 0;
1042 static const char *const kwlist[] = { "field", "a", "b", 0 };
1043 mp *aa = 0, *bb = 0;
1044
1045 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O&O&", KWLIST,
1046 field_pytype, &fobj,
1047 convmp, &aa, convmp, &bb))
1048 goto end;
1049 Py_INCREF(fobj);
1050 cobj = eccurve_dopywrap(ty, fobj, make(FIELD_F(fobj), aa, bb));
1051 end:
1052 if (aa) MP_DROP(aa);
1053 if (bb) MP_DROP(bb);
1054 return (cobj);
1055 }
1056
1057 static PyObject *ecget_name(PyObject *me, void *hunoz)
1058 { return (TEXT_FROMSTR(EC_NAME(ECCURVE_C(me)))); }
1059
1060 static PyObject *ecget_a(PyObject *me, void *hunoz)
1061 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->a))); }
1062
1063 static PyObject *ecget_b(PyObject *me, void *hunoz)
1064 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->b))); }
1065
1066 static PyObject *ecget_field(PyObject *me, void *hunoz)
1067 { RETURN_OBJ(ECCURVE_FOBJ(me)); }
1068
1069 static PyObject *ecget_inf(PyObject *me, void *hunoz)
1070 { ec inf = EC_INIT; return (ecpt_pywrap(me, &inf)); }
1071
1072 static const PyGetSetDef eccurve_pygetset[] = {
1073 #define GETSETNAME(op, name) ec##op##_##name
1074 GET (name, "E.name -> name of this kind of curve")
1075 GET (a, "E.a -> first parameter of curve")
1076 GET (b, "E.b -> second parameter of curve")
1077 GET (field, "E.field -> finite field containing this curve")
1078 GET (inf, "E.inf -> point at infinity of this curve")
1079 #undef GETSETNAME
1080 { 0 }
1081 };
1082
1083 static const PyMethodDef eccurve_pymethods[] = {
1084 #define METHNAME(name) ecmeth_##name
1085 METH (mmul, "E.mmul([(P0, N0), (P1, N1), ...]) = N0 P0 + N1 P1 + ...")
1086 METH (find, "E.find(X) -> P")
1087 KWMETH(rand, "E.rand([rng = rand]) -> P")
1088 SMTH (parse, "parse(STR) -> (E, REST)")
1089 #undef METHNAME
1090 { 0 }
1091 };
1092
1093 static const PyTypeObject eccurve_pytype_skel = {
1094 PyVarObject_HEAD_INIT(0, 0) /* Header */
1095 "ECCurve", /* @tp_name@ */
1096 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1097 0, /* @tp_itemsize@ */
1098
1099 eccurve_pydealloc, /* @tp_dealloc@ */
1100 0, /* @tp_print@ */
1101 0, /* @tp_getattr@ */
1102 0, /* @tp_setattr@ */
1103 0, /* @tp_compare@ */
1104 0, /* @tp_repr@ */
1105 0, /* @tp_as_number@ */
1106 0, /* @tp_as_sequence@ */
1107 0, /* @tp_as_mapping@ */
1108 0, /* @tp_hash@ */
1109 0, /* @tp_call@ */
1110 0, /* @tp_str@ */
1111 0, /* @tp_getattro@ */
1112 0, /* @tp_setattro@ */
1113 0, /* @tp_as_buffer@ */
1114 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1115 Py_TPFLAGS_BASETYPE,
1116
1117 /* @tp_doc@ */
1118 "An elliptic curve. Abstract class.",
1119
1120 0, /* @tp_traverse@ */
1121 0, /* @tp_clear@ */
1122 eccurve_pyrichcompare, /* @tp_richcompare@ */
1123 0, /* @tp_weaklistoffset@ */
1124 0, /* @tp_iter@ */
1125 0, /* @tp_iternext@ */
1126 PYMETHODS(eccurve), /* @tp_methods@ */
1127 0, /* @tp_members@ */
1128 PYGETSET(eccurve), /* @tp_getset@ */
1129 0, /* @tp_base@ */
1130 0, /* @tp_dict@ */
1131 0, /* @tp_descr_get@ */
1132 0, /* @tp_descr_set@ */
1133 0, /* @tp_dictoffset@ */
1134 0, /* @tp_init@ */
1135 PyType_GenericAlloc, /* @tp_alloc@ */
1136 abstract_pynew, /* @tp_new@ */
1137 0, /* @tp_free@ */
1138 0 /* @tp_is_gc@ */
1139 };
1140
1141 static PyObject *ecprimecurve_pynew(PyTypeObject *ty,
1142 PyObject *arg, PyObject *kw)
1143 {
1144 return (eccurve_pynew(ty, ec_prime, arg, kw));
1145 }
1146
1147 static const PyTypeObject ecprimecurve_pytype_skel = {
1148 PyVarObject_HEAD_INIT(0, 0) /* Header */
1149 "ECPrimeCurve", /* @tp_name@ */
1150 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1151 0, /* @tp_itemsize@ */
1152
1153 eccurve_pydealloc, /* @tp_dealloc@ */
1154 0, /* @tp_print@ */
1155 0, /* @tp_getattr@ */
1156 0, /* @tp_setattr@ */
1157 0, /* @tp_compare@ */
1158 0, /* @tp_repr@ */
1159 0, /* @tp_as_number@ */
1160 0, /* @tp_as_sequence@ */
1161 0, /* @tp_as_mapping@ */
1162 0, /* @tp_hash@ */
1163 0, /* @tp_call@ */
1164 0, /* @tp_str@ */
1165 0, /* @tp_getattro@ */
1166 0, /* @tp_setattro@ */
1167 0, /* @tp_as_buffer@ */
1168 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1169 Py_TPFLAGS_BASETYPE,
1170
1171 /* @tp_doc@ */
1172 "ECPrimeCurve(FIELD, A, B): an elliptic curve over a prime field.\n"
1173 " Use ECPrimeProjCurve instead.",
1174
1175 0, /* @tp_traverse@ */
1176 0, /* @tp_clear@ */
1177 0, /* @tp_richcompare@ */
1178 0, /* @tp_weaklistoffset@ */
1179 0, /* @tp_iter@ */
1180 0, /* @tp_iternext@ */
1181 0, /* @tp_methods@ */
1182 0, /* @tp_members@ */
1183 0, /* @tp_getset@ */
1184 0, /* @tp_base@ */
1185 0, /* @tp_dict@ */
1186 0, /* @tp_descr_get@ */
1187 0, /* @tp_descr_set@ */
1188 0, /* @tp_dictoffset@ */
1189 0, /* @tp_init@ */
1190 PyType_GenericAlloc, /* @tp_alloc@ */
1191 ecprimecurve_pynew, /* @tp_new@ */
1192 0, /* @tp_free@ */
1193 0 /* @tp_is_gc@ */
1194 };
1195
1196 static PyObject *ecprimeprojcurve_pynew(PyTypeObject *ty,
1197 PyObject *arg, PyObject *kw)
1198 {
1199 return (eccurve_pynew(ty, ec_primeproj, arg, kw));
1200 }
1201
1202 static const PyTypeObject ecprimeprojcurve_pytype_skel = {
1203 PyVarObject_HEAD_INIT(0, 0) /* Header */
1204 "ECPrimeProjCurve", /* @tp_name@ */
1205 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1206 0, /* @tp_itemsize@ */
1207
1208 eccurve_pydealloc, /* @tp_dealloc@ */
1209 0, /* @tp_print@ */
1210 0, /* @tp_getattr@ */
1211 0, /* @tp_setattr@ */
1212 0, /* @tp_compare@ */
1213 0, /* @tp_repr@ */
1214 0, /* @tp_as_number@ */
1215 0, /* @tp_as_sequence@ */
1216 0, /* @tp_as_mapping@ */
1217 0, /* @tp_hash@ */
1218 0, /* @tp_call@ */
1219 0, /* @tp_str@ */
1220 0, /* @tp_getattro@ */
1221 0, /* @tp_setattro@ */
1222 0, /* @tp_as_buffer@ */
1223 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1224 Py_TPFLAGS_BASETYPE,
1225
1226 /* @tp_doc@ */
1227 "ECPrimeProjCurve(FIELD, A, B): an elliptic curve over a prime field\n"
1228 " using projective coordinates.",
1229
1230 0, /* @tp_traverse@ */
1231 0, /* @tp_clear@ */
1232 0, /* @tp_richcompare@ */
1233 0, /* @tp_weaklistoffset@ */
1234 0, /* @tp_iter@ */
1235 0, /* @tp_iternext@ */
1236 0, /* @tp_methods@ */
1237 0, /* @tp_members@ */
1238 0, /* @tp_getset@ */
1239 0, /* @tp_base@ */
1240 0, /* @tp_dict@ */
1241 0, /* @tp_descr_get@ */
1242 0, /* @tp_descr_set@ */
1243 0, /* @tp_dictoffset@ */
1244 0, /* @tp_init@ */
1245 PyType_GenericAlloc, /* @tp_alloc@ */
1246 ecprimeprojcurve_pynew, /* @tp_new@ */
1247 0, /* @tp_free@ */
1248 0 /* @tp_is_gc@ */
1249 };
1250
1251 static PyObject *ecbincurve_pynew(PyTypeObject *ty,
1252 PyObject *arg, PyObject *kw)
1253 {
1254 return (eccurve_pynew(ty, ec_bin, arg, kw));
1255 }
1256
1257 static const PyTypeObject ecbincurve_pytype_skel = {
1258 PyVarObject_HEAD_INIT(0, 0) /* Header */
1259 "ECBinCurve", /* @tp_name@ */
1260 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1261 0, /* @tp_itemsize@ */
1262
1263 eccurve_pydealloc, /* @tp_dealloc@ */
1264 0, /* @tp_print@ */
1265 0, /* @tp_getattr@ */
1266 0, /* @tp_setattr@ */
1267 0, /* @tp_compare@ */
1268 0, /* @tp_repr@ */
1269 0, /* @tp_as_number@ */
1270 0, /* @tp_as_sequence@ */
1271 0, /* @tp_as_mapping@ */
1272 0, /* @tp_hash@ */
1273 0, /* @tp_call@ */
1274 0, /* @tp_str@ */
1275 0, /* @tp_getattro@ */
1276 0, /* @tp_setattro@ */
1277 0, /* @tp_as_buffer@ */
1278 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1279 Py_TPFLAGS_BASETYPE,
1280
1281 /* @tp_doc@ */
1282 "ECBinCurve(FIELD, A, B): an elliptic curve over a binary field.\n"
1283 " Use ECBinProjCurve instead.",
1284
1285 0, /* @tp_traverse@ */
1286 0, /* @tp_clear@ */
1287 0, /* @tp_richcompare@ */
1288 0, /* @tp_weaklistoffset@ */
1289 0, /* @tp_iter@ */
1290 0, /* @tp_iternext@ */
1291 0, /* @tp_methods@ */
1292 0, /* @tp_members@ */
1293 0, /* @tp_getset@ */
1294 0, /* @tp_base@ */
1295 0, /* @tp_dict@ */
1296 0, /* @tp_descr_get@ */
1297 0, /* @tp_descr_set@ */
1298 0, /* @tp_dictoffset@ */
1299 0, /* @tp_init@ */
1300 PyType_GenericAlloc, /* @tp_alloc@ */
1301 ecbincurve_pynew, /* @tp_new@ */
1302 0, /* @tp_free@ */
1303 0 /* @tp_is_gc@ */
1304 };
1305
1306 static PyObject *ecbinprojcurve_pynew(PyTypeObject *ty,
1307 PyObject *arg, PyObject *kw)
1308 {
1309 return (eccurve_pynew(ty, ec_binproj, arg, kw));
1310 }
1311
1312 static const PyTypeObject ecbinprojcurve_pytype_skel = {
1313 PyVarObject_HEAD_INIT(0, 0) /* Header */
1314 "ECBinProjCurve", /* @tp_name@ */
1315 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1316 0, /* @tp_itemsize@ */
1317
1318 eccurve_pydealloc, /* @tp_dealloc@ */
1319 0, /* @tp_print@ */
1320 0, /* @tp_getattr@ */
1321 0, /* @tp_setattr@ */
1322 0, /* @tp_compare@ */
1323 0, /* @tp_repr@ */
1324 0, /* @tp_as_number@ */
1325 0, /* @tp_as_sequence@ */
1326 0, /* @tp_as_mapping@ */
1327 0, /* @tp_hash@ */
1328 0, /* @tp_call@ */
1329 0, /* @tp_str@ */
1330 0, /* @tp_getattro@ */
1331 0, /* @tp_setattro@ */
1332 0, /* @tp_as_buffer@ */
1333 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1334 Py_TPFLAGS_BASETYPE,
1335
1336 /* @tp_doc@ */
1337 "ECBinProjCurve(FIELD, A, B): an elliptic curve over a binary field,\n"
1338 " using projective coordinates.",
1339
1340 0, /* @tp_traverse@ */
1341 0, /* @tp_clear@ */
1342 0, /* @tp_richcompare@ */
1343 0, /* @tp_weaklistoffset@ */
1344 0, /* @tp_iter@ */
1345 0, /* @tp_iternext@ */
1346 0, /* @tp_methods@ */
1347 0, /* @tp_members@ */
1348 0, /* @tp_getset@ */
1349 0, /* @tp_base@ */
1350 0, /* @tp_dict@ */
1351 0, /* @tp_descr_get@ */
1352 0, /* @tp_descr_set@ */
1353 0, /* @tp_dictoffset@ */
1354 0, /* @tp_init@ */
1355 PyType_GenericAlloc, /* @tp_alloc@ */
1356 ecbinprojcurve_pynew, /* @tp_new@ */
1357 0, /* @tp_free@ */
1358 0 /* @tp_is_gc@ */
1359 };
1360
1361 /*----- Curve info --------------------------------------------------------*/
1362
1363 void ecinfo_copy(ec_info *eic, const ec_info *ei)
1364 {
1365 eic->c = eccurve_copy(ei->c);
1366 EC_CREATE(&eic->g);
1367 EC_COPY(&eic->g, &ei->g);
1368 eic->r = MP_COPY(ei->r);
1369 eic->h = MP_COPY(ei->h);
1370 }
1371
1372 PyObject *ecinfo_pywrap(ec_info *ei)
1373 {
1374 ecinfo_pyobj *o;
1375
1376 o = PyObject_NEW(ecinfo_pyobj, ecinfo_pytype);
1377 o->ei = *ei;
1378 o->cobj = eccurve_pywrap(0, o->ei.c);
1379 Py_INCREF(o->cobj);
1380 return ((PyObject *)o);
1381 }
1382
1383 static void ecinfo_pydealloc(PyObject *me)
1384 {
1385 ec_info *ei = ECINFO_EI(me);
1386 EC_DESTROY(&ei->g);
1387 MP_DROP(ei->r);
1388 MP_DROP(ei->h);
1389 Py_DECREF(ECINFO_COBJ(me));
1390 FREEOBJ(me);
1391 }
1392
1393 static PyObject *ecinfo_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
1394 {
1395 ec_info ei = { 0 };
1396 PyObject *e, *g;
1397 static const char *const kwlist[] = { "curve", "G", "r", "h", 0 };
1398 ecinfo_pyobj *rc = 0;
1399
1400 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O!O&O&:new", KWLIST,
1401 eccurve_pytype, &e, ecpt_pytype, &g,
1402 convmp, &ei.r, convmp, &ei.h))
1403 goto end;
1404 if (ECPT_C(g) != ECCURVE_C(e) && !ec_samep(ECPT_C(g), ECCURVE_C(e)))
1405 TYERR("point not from this curve");
1406 ei.c = ECCURVE_C(e);
1407 EC_CREATE(&ei.g);
1408 EC_OUT(ei.c, &ei.g, ECPT_P(g));
1409 rc = (ecinfo_pyobj *)ty->tp_alloc(ty, 0);
1410 rc->ei = ei;
1411 rc->cobj = e;
1412 Py_INCREF(rc->cobj);
1413 return ((PyObject *)rc);
1414
1415 end:
1416 mp_drop(ei.r);
1417 mp_drop(ei.h);
1418 return (0);
1419 }
1420
1421 static PyObject *eimeth_parse(PyObject *me, PyObject *arg)
1422 {
1423 char *p;
1424 qd_parse qd;
1425 ec_info ei;
1426 PyObject *rc = 0;
1427
1428 if (!PyArg_ParseTuple(arg, "s:parse", &p)) goto end;
1429 qd.p = p; qd.e = 0;
1430 if (ec_infoparse(&qd, &ei)) VALERR(qd.e);
1431 rc = Py_BuildValue("(Ns)", ecinfo_pywrap(&ei), qd.p);
1432 end:
1433 return (rc);
1434 }
1435
1436 static PyObject *ecinfo_pyrichcompare(PyObject *x, PyObject *y, int op)
1437 {
1438 int b = ec_sameinfop(ECINFO_EI(x), ECINFO_EI(y));
1439 switch (op) {
1440 case Py_EQ: break;
1441 case Py_NE: b = !b;
1442 default: TYERR("can't order elliptic curve infos");
1443 }
1444 return (getbool(b));
1445 end:
1446 return (0);
1447 }
1448
1449 static PyObject *eimeth_check(PyObject *me, PyObject *arg, PyObject *kw)
1450 {
1451 static const char *const kwlist[] = { "rng", 0 };
1452 grand *r = &rand_global;
1453 const char *p;
1454
1455 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:check", KWLIST,
1456 convgrand, &r))
1457 goto end;
1458 if ((p = ec_checkinfo(ECINFO_EI(me), r)) != 0)
1459 VALERR(p);
1460 RETURN_ME;
1461 end:
1462 return (0);
1463 }
1464
1465 static PyObject *eiget_curve(PyObject *me, void *hunoz)
1466 { RETURN_OBJ(ECINFO_COBJ(me)); }
1467
1468 static PyObject *eiget_G(PyObject *me, void *hunoz)
1469 {
1470 ec_info *ei = ECINFO_EI(me);
1471 ec p = EC_INIT;
1472 EC_IN(ei->c, &p, &ei->g);
1473 return (ecpt_pywrap(ECINFO_COBJ(me), &p));
1474 }
1475
1476 static PyObject *eiget_r(PyObject *me, void *hunoz)
1477 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->r))); }
1478
1479 static PyObject *eiget_h(PyObject *me, void *hunoz)
1480 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->h))); }
1481
1482 static const PyGetSetDef ecinfo_pygetset[] = {
1483 #define GETSETNAME(op, name) ei##op##_##name
1484 GET (curve, "I.curve -> the elliptic curve")
1485 GET (G, "I.G -> generator point for the group")
1486 GET (r, "I.r -> order of the group (and hence of G")
1487 GET (h, "I.h -> cofactor of the group")
1488 #undef GETSETNAME
1489 { 0 }
1490 };
1491
1492 static const PyMethodDef ecinfo_pymethods[] = {
1493 #define METHNAME(name) eimeth_##name
1494 KWMETH(check, "I.check([rng = rand]) -> None")
1495 SMTH (parse, "parse(STR) -> (I, REST)")
1496 #undef METHNAME
1497 { 0 }
1498 };
1499
1500 static const PyTypeObject ecinfo_pytype_skel = {
1501 PyVarObject_HEAD_INIT(0, 0) /* Header */
1502 "ECInfo", /* @tp_name@ */
1503 sizeof(ecinfo_pyobj), /* @tp_basicsize@ */
1504 0, /* @tp_itemsize@ */
1505
1506 ecinfo_pydealloc, /* @tp_dealloc@ */
1507 0, /* @tp_print@ */
1508 0, /* @tp_getattr@ */
1509 0, /* @tp_setattr@ */
1510 0, /* @tp_compare@ */
1511 0, /* @tp_repr@ */
1512 0, /* @tp_as_number@ */
1513 0, /* @tp_as_sequence@ */
1514 0, /* @tp_as_mapping@ */
1515 0, /* @tp_hash@ */
1516 0, /* @tp_call@ */
1517 0, /* @tp_str@ */
1518 0, /* @tp_getattro@ */
1519 0, /* @tp_setattro@ */
1520 0, /* @tp_as_buffer@ */
1521 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1522 Py_TPFLAGS_BASETYPE,
1523
1524 /* @tp_doc@ */
1525 "ECInfo(CURVE, G, R, H): elliptic curve domain parameters.",
1526
1527 0, /* @tp_traverse@ */
1528 0, /* @tp_clear@ */
1529 ecinfo_pyrichcompare, /* @tp_richcompare@ */
1530 0, /* @tp_weaklistoffset@ */
1531 0, /* @tp_iter@ */
1532 0, /* @tp_iternext@ */
1533 PYMETHODS(ecinfo), /* @tp_methods@ */
1534 0, /* @tp_members@ */
1535 PYGETSET(ecinfo), /* @tp_getset@ */
1536 0, /* @tp_base@ */
1537 0, /* @tp_dict@ */
1538 0, /* @tp_descr_get@ */
1539 0, /* @tp_descr_set@ */
1540 0, /* @tp_dictoffset@ */
1541 0, /* @tp_init@ */
1542 PyType_GenericAlloc, /* @tp_alloc@ */
1543 ecinfo_pynew, /* @tp_new@ */
1544 0, /* @tp_free@ */
1545 0 /* @tp_is_gc@ */
1546 };
1547
1548 /*----- Setup -------------------------------------------------------------*/
1549
1550 static const struct nameval consts[] = {
1551 CONST(EC_XONLY), CONST(EC_YBIT), CONST(EC_LSB),
1552 CONST(EC_CMPR), CONST(EC_EXPLY), CONST(EC_SORT),
1553 { 0 }
1554 };
1555
1556 void ec_pyinit(void)
1557 {
1558 INITTYPE(ecpt, root);
1559 INITTYPE(ecptcurve, ecpt);
1560 INITTYPE(eccurve, type);
1561 INITTYPE(ecprimecurve, eccurve);
1562 INITTYPE(ecprimeprojcurve, ecprimecurve);
1563 INITTYPE(ecbincurve, eccurve);
1564 INITTYPE(ecbinprojcurve, ecbincurve);
1565 INITTYPE(ecinfo, root);
1566 }
1567
1568 static const char *ec_namefn(const void *p)
1569 { const ecentry *ec = p; return (ec->name); }
1570
1571 static int ec_ixfn(const void *p)
1572 {
1573 const ecentry *ec = p;
1574 int i;
1575
1576 for (i = 0; ectab[i].name; i++)
1577 if (ectab[i].data == ec->data) return (i);
1578 return (-1);
1579 }
1580
1581 static PyObject *ec_valfn(int i)
1582 {
1583 ec_info ei;
1584
1585 ec_infofromdata(&ei, ectab[i].data);
1586 return (ecinfo_pywrap(&ei));
1587 }
1588
1589 void ec_pyinsert(PyObject *mod)
1590 {
1591 INSERT("ECPt", ecpt_pytype);
1592 INSERT("ECPtCurve", ecptcurve_pytype);
1593 INSERT("ECCurve", eccurve_pytype);
1594 INSERT("ECPrimeCurve", ecprimecurve_pytype);
1595 INSERT("ECPrimeProjCurve", ecprimeprojcurve_pytype);
1596 INSERT("ECBinCurve", ecbincurve_pytype);
1597 INSERT("ECBinProjCurve", ecbinprojcurve_pytype);
1598 INSERT("ECInfo", ecinfo_pytype);
1599 INSERT("eccurves", make_grouptab(ectab, sizeof(*ectab),
1600 ec_namefn, ec_ixfn, ec_valfn));
1601 setconstants(mod, consts);
1602 }
1603
1604 /*----- That's all, folks -------------------------------------------------*/
Catacomb cryptographic library -- Python bindings