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algorithms.c: Add bindings for STROBE.
[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, *u = 0;
517 mp *xx = 0;
518 qd_parse qd;
519 int paren;
520
521 Py_XINCREF(x);
522 if (!x || x == Py_None)
523 /*cool*/;
524 else if (ECPT_PYCHECK(x)) {
525 getecptout(p, x);
526 goto fix;
527 } else if (TEXT_CHECK(x)) {
528 qd.p = TEXT_PTR(x); qd.e = 0;
529 qd_skipspc(&qd); paren = qd_delim(&qd, '(');
530 if (!ec_ptparse(&qd, p)) VALERR(qd.e);
531 qd_skipspc(&qd); if (paren && !qd_delim(&qd, ')'))
532 { EC_DESTROY(p); VALERR("missing `)'"); }
533 qd_skipspc(&qd); if (!qd_eofp(&qd)) VALERR("junk at eof");
534 goto fix;
535 } else if (c && (xx = tomp(x)) != 0) {
536 xx = F_IN(c->f, xx, xx);
537 if (!EC_FIND(c, p, xx)) VALERR("not on the curve");
538 } else if ((t = PyObject_GetIter(x)) != 0) {
539 Py_DECREF(x);
540 x = PyIter_Next(t); if (!x) goto enditer;
541 y = PyIter_Next(t); if (!y) goto enditer;
542 z = PyIter_Next(t); if (!z && PyErr_Occurred()) goto end;
543 if (z) {
544 u = PyIter_Next(t);
545 if (u) goto enditer;
546 else if (PyErr_Occurred()) goto end;
547 }
548 rc = !z ? ecptxl_2(c, p, x, y) : ecptxl_3(c, p, x, y, z);
549 goto end;
550 } else {
551 PyErr_Clear();
552 TYERR("can't convert to curve point");
553 }
554 goto ok;
555
556 enditer:
557 if (PyErr_Occurred()) goto end;
558 TYERR("expected sequence of 2 or 3 items");
559 fix:
560 if (c) EC_IN(c, p, p);
561 ok:
562 rc = 0;
563 end:
564 Py_XDECREF(x); Py_XDECREF(y); Py_XDECREF(z); Py_XDECREF(t); Py_XDECREF(u);
565 mp_drop(xx);
566 return (rc);
567 }
568
569 static int ecptxl(ec_curve *c, ec *p, PyObject *x, PyObject *y, PyObject *z)
570 {
571 if (z)
572 return (ecptxl_3(c, p, x, y, z));
573 else if (y)
574 return (ecptxl_2(c, p, x, y));
575 else
576 return (ecptxl_1(c, p, x));
577 }
578
579 static PyObject *ecptnc_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
580 {
581 PyObject *x = 0, *y = 0, *z = 0;
582 ec p = EC_INIT;
583 static const char *const kwlist[] = { "x", "y", 0 };
584
585 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OO:new", KWLIST, &x, &y) ||
586 ecptxl(0, &p, x, y, z))
587 goto end;
588 return (ecpt_pywrapout(ty, &p));
589 end:
590 mp_drop(p.x); mp_drop(p.y); mp_drop(p.z);
591 return (0);
592 }
593
594 static PyObject *ecpt_pyint(PyObject *me)
595 {
596 ec p = EC_INIT;
597 long l;
598 PyObject *rc = 0;
599 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
600 getecptout(&p, me);
601 if (!mp_tolong_checked(p.x, &l, 0)) rc = PyInt_FromLong(l);
602 else rc = mp_topylong(p.x);
603 end:
604 EC_DESTROY(&p);
605 return (rc);
606 }
607
608 #ifdef PY2
609 static PyObject *ecpt_pylong(PyObject *me)
610 {
611 ec p = EC_INIT;
612 PyObject *rc = 0;
613 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
614 getecptout(&p, me);
615 rc = mp_topylong(p.x);
616 end:
617 EC_DESTROY(&p);
618 return (rc);
619 }
620 #endif
621
622 static PyObject *ecpt_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
623 {
624 PyObject *x = 0, *y = 0, *z = 0;
625 ec p = EC_INIT;
626 static const char *const kwlist[] = { "x", "y", "z", 0 };
627
628 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OOO:new", KWLIST,
629 &x, &y, &z) ||
630 ecptxl(ECCURVE_C(ty), &p, x, y, z))
631 goto end;
632 return (ecpt_pywrap((PyObject *)ty, &p));
633 end:
634 mp_drop(p.x); mp_drop(p.y); mp_drop(p.z);
635 return (0);
636 }
637
638 static const PyGetSetDef ecptnc_pygetset[] = {
639 #define GETSETNAME(op, name) epnc##op##_##name
640 GET (ix, "P.ix -> integer x coordinate of P")
641 GET (iy, "P.iy -> integer y coordinate of P")
642 GET (point, "P.point -> standalone curve point (no-op)")
643 #undef GETSETNAME
644 { 0 }
645 };
646
647 static const PyMethodDef ecptnc_pymethods[] = {
648 #define METHNAME(func) epmeth_##func
649 NAMETH(tobuf, "X.tobuf() -> BIN")
650 CMTH (frombuf, "frombuf(STR) -> (P, REST)")
651 CMTH (parse, "parse(STR) -> (P, REST)")
652 #undef METHNAME
653 { 0 }
654 };
655
656 static const PyNumberMethods ecpt_pynumber = {
657 0, /* @nb_add@ */
658 0, /* @nb_subtract@ */
659 0, /* @nb_multiply@ */
660 #ifdef PY2
661 0, /* @nb_divide@ */
662 #endif
663 0, /* @nb_remainder@ */
664 0, /* @nb_divmod@ */
665 0, /* @nb_power@ */
666 0, /* @nb_negative@ */
667 0, /* @nb_positive@ */
668 0, /* @nb_absolute@ */
669 ecpt_pynonzerop, /* @nb_nonzero@ */
670 0, /* @nb_invert@ */
671 0, /* @nb_lshift@ */
672 0, /* @nb_rshift@ */
673 0, /* @nb_and@ */
674 0, /* @nb_xor@ */
675 0, /* @nb_or@ */
676 #ifdef PY2
677 0, /* @nb_coerce@ */
678 #endif
679 ecpt_pyint, /* @nb_int@ */
680 PY23(ecpt_pylong, 0), /* @nb_long@ */
681 0, /* @nb_float@ */
682 #ifdef PY2
683 0, /* @nb_oct@ */
684 0, /* @nb_hex@ */
685 #endif
686
687 0, /* @nb_inplace_add@ */
688 0, /* @nb_inplace_subtract@ */
689 0, /* @nb_inplace_multiply@ */
690 #ifdef PY2
691 0, /* @nb_inplace_divide@ */
692 #endif
693 0, /* @nb_inplace_remainder@ */
694 0, /* @nb_inplace_power@ */
695 0, /* @nb_inplace_lshift@ */
696 0, /* @nb_inplace_rshift@ */
697 0, /* @nb_inplace_and@ */
698 0, /* @nb_inplace_xor@ */
699 0, /* @nb_inplace_or@ */
700
701 0, /* @nb_floor_divide@ */
702 0, /* @nb_true_divide@ */
703 0, /* @nb_inplace_floor_divide@ */
704 0, /* @nb_inplace_true_divide@ */
705 };
706
707 static const PyTypeObject ecpt_pytype_skel = {
708 PyVarObject_HEAD_INIT(0, 0) /* Header */
709 "ECPt", /* @tp_name@ */
710 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
711 0, /* @tp_itemsize@ */
712
713 ecpt_pydealloc, /* @tp_dealloc@ */
714 0, /* @tp_print@ */
715 0, /* @tp_getattr@ */
716 0, /* @tp_setattr@ */
717 0, /* @tp_compare@ */
718 0, /* @tp_repr@ */
719 PYNUMBER(ecpt), /* @tp_as_number@ */
720 0, /* @tp_as_sequence@ */
721 0, /* @tp_as_mapping@ */
722 ecpt_pyhash, /* @tp_hash@ */
723 0, /* @tp_call@ */
724 0, /* @tp_str@ */
725 0, /* @tp_getattro@ */
726 0, /* @tp_setattro@ */
727 0, /* @tp_as_buffer@ */
728 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
729 Py_TPFLAGS_CHECKTYPES |
730 Py_TPFLAGS_BASETYPE,
731
732 /* @tp_doc@ */
733 "ECPt([X, [Y]]): elliptic curve points, not associated with any curve.\n"
734 " X alone may be None, an existing point, a string 'X, Y', an\n"
735 " x-coordinate, or a pair (X, Y); X and Y should be a coordinate pair.",
736
737 0, /* @tp_traverse@ */
738 0, /* @tp_clear@ */
739 ecpt_pyrichcompare, /* @tp_richcompare@ */
740 0, /* @tp_weaklistoffset@ */
741 0, /* @tp_iter@ */
742 0, /* @tp_iternext@ */
743 PYMETHODS(ecptnc), /* @tp_methods@ */
744 0, /* @tp_members@ */
745 PYGETSET(ecptnc), /* @tp_getset@ */
746 0, /* @tp_base@ */
747 0, /* @tp_dict@ */
748 0, /* @tp_descr_get@ */
749 0, /* @tp_descr_set@ */
750 0, /* @tp_dictoffset@ */
751 0, /* @tp_init@ */
752 PyType_GenericAlloc, /* @tp_alloc@ */
753 ecptnc_pynew, /* @tp_new@ */
754 0, /* @tp_free@ */
755 0 /* @tp_is_gc@ */
756 };
757
758 static const PyMemberDef ecpt_pymembers[] = {
759 #define MEMBERSTRUCT ecpt_pyobj
760 MEMRNM(curve, T_OBJECT, PY23(ob_type, ob_base.ob_type), READONLY,
761 "P.curve -> elliptic curve containing P")
762 #undef MEMBERSTRUCT
763 { 0 }
764 };
765
766 static const PyGetSetDef ecpt_pygetset[] = {
767 #define GETSETNAME(op, name) ep##op##_##name
768 GET (point, "P.point -> standalone curve point")
769 GET (x, "P.x -> Cartesian x coordinate of P")
770 GET (y, "P.y -> Cartesian y coordinate of P")
771 GET (_x, "P._x -> internal x coordinate of P")
772 GET (_y, "P._y -> internal y coordinate of P")
773 GET (_z, "P._z -> internal z coordinate of P, or None")
774 #undef GETSETNAME
775 { 0 }
776 };
777
778 static const PyMethodDef ecpt_pymethods[] = {
779 #define METHNAME(func) epmeth_##func
780 NAMETH(toraw, "X.toraw() -> BIN")
781 KWMETH(ec2osp, "X.ec2osp([flags = EC_EXPLY]) -> BIN")
782 NAMETH(dbl, "X.dbl() -> X + X")
783 NAMETH(oncurvep, "X.oncurvep() -> BOOL")
784 CMTH (fromraw, "fromraw(STR) -> (P, REST)")
785 KWCMTH(os2ecp, "os2ecp(STR, [flags = ...]) -> (P, REST)")
786 #undef METHNAME
787 { 0 }
788 };
789
790 static const PyNumberMethods ecptcurve_pynumber = {
791 ecpt_pyadd, /* @nb_add@ */
792 ecpt_pysub, /* @nb_subtract@ */
793 ecpt_pymul, /* @nb_multiply@ */
794 #ifdef PY2
795 0, /* @nb_divide@ */
796 #endif
797 0, /* @nb_remainder@ */
798 0, /* @nb_divmod@ */
799 0, /* @nb_power@ */
800 ecpt_pyneg, /* @nb_negative@ */
801 ecpt_pyid, /* @nb_positive@ */
802 0, /* @nb_absolute@ */
803 0, /* @nb_nonzero@ */
804 0, /* @nb_invert@ */
805 0, /* @nb_lshift@ */
806 0, /* @nb_rshift@ */
807 0, /* @nb_and@ */
808 0, /* @nb_xor@ */
809 0, /* @nb_or@ */
810 #ifdef PY2
811 0, /* @nb_coerce@ */
812 #endif
813 0, /* @nb_int@ */
814 0, /* @nb_long@ */
815 0, /* @nb_float@ */
816 #ifdef PY2
817 0, /* @nb_oct@ */
818 0, /* @nb_hex@ */
819 #endif
820
821 0, /* @nb_inplace_add@ */
822 0, /* @nb_inplace_subtract@ */
823 0, /* @nb_inplace_multiply@ */
824 0, /* @nb_inplace_divide@ */
825 0, /* @nb_inplace_remainder@ */
826 0, /* @nb_inplace_power@ */
827 0, /* @nb_inplace_lshift@ */
828 0, /* @nb_inplace_rshift@ */
829 0, /* @nb_inplace_and@ */
830 0, /* @nb_inplace_xor@ */
831 0, /* @nb_inplace_or@ */
832
833 0, /* @nb_floor_divide@ */
834 0, /* @nb_true_divide@ */
835 0, /* @nb_inplace_floor_divide@ */
836 0, /* @nb_inplace_true_divide@ */
837 };
838
839 static const PyTypeObject ecptcurve_pytype_skel = {
840 PyVarObject_HEAD_INIT(0, 0) /* Header */
841 "ECPtCurve", /* @tp_name@ */
842 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
843 0, /* @tp_itemsize@ */
844
845 ecpt_pydealloc, /* @tp_dealloc@ */
846 0, /* @tp_print@ */
847 0, /* @tp_getattr@ */
848 0, /* @tp_setattr@ */
849 0, /* @tp_compare@ */
850 0, /* @tp_repr@ */
851 PYNUMBER(ecptcurve), /* @tp_as_number@ */
852 0, /* @tp_as_sequence@ */
853 0, /* @tp_as_mapping@ */
854 0, /* @tp_hash@ */
855 0, /* @tp_call@ */
856 0, /* @tp_str@ */
857 0, /* @tp_getattro@ */
858 0, /* @tp_setattro@ */
859 0, /* @tp_as_buffer@ */
860 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
861 Py_TPFLAGS_CHECKTYPES |
862 Py_TPFLAGS_BASETYPE,
863
864 /* @tp_doc@ */
865 "Elliptic curve points; abstract base class for points on given curves.",
866
867 0, /* @tp_traverse@ */
868 0, /* @tp_clear@ */
869 0, /* @tp_richcompare@ */
870 0, /* @tp_weaklistoffset@ */
871 0, /* @tp_iter@ */
872 0, /* @tp_iternext@ */
873 PYMETHODS(ecpt), /* @tp_methods@ */
874 PYMEMBERS(ecpt), /* @tp_members@ */
875 PYGETSET(ecpt), /* @tp_getset@ */
876 0, /* @tp_base@ */
877 0, /* @tp_dict@ */
878 0, /* @tp_descr_get@ */
879 0, /* @tp_descr_set@ */
880 0, /* @tp_dictoffset@ */
881 0, /* @tp_init@ */
882 PyType_GenericAlloc, /* @tp_alloc@ */
883 abstract_pynew, /* @tp_new@ */
884 0, /* @tp_free@ */
885 0 /* @tp_is_gc@ */
886 };
887
888 /*----- Elliptic curves themselves ----------------------------------------*/
889
890 static PyObject *eccurve_pyrichcompare(PyObject *x, PyObject *y, int op)
891 {
892 int b;
893
894 assert(ECCURVE_PYCHECK(x));
895 if (!ECCURVE_PYCHECK(y)) RETURN_NOTIMPL;
896 b = ec_samep(ECCURVE_C(x), ECCURVE_C(y));
897 switch (op) {
898 case Py_EQ: break;
899 case Py_NE: b = !b; break;
900 default: TYERR("can't order elliptic curves");
901 }
902 return (getbool(b));
903 end:
904 return (0);
905 }
906
907 static PyObject *ecmmul_id(PyObject *me)
908 { ec p = EC_INIT; return (ecpt_pywrap(me, &p)); }
909
910 static int ecmmul_fill(void *pp, PyObject *me, PyObject *x, PyObject *m)
911 {
912 ec_mulfactor *f = pp;
913
914 EC_CREATE(&f->base);
915 if (getecpt(ECCURVE_C(me), &f->base, x) ||
916 (f->exp = getmp(m)) == 0)
917 return (-1);
918 return (0);
919 }
920
921 static PyObject *ecmmul_exp(PyObject *me, void *pp, size_t n)
922 {
923 ec p = EC_INIT;
924 ec_immul(ECCURVE_C(me), &p, pp, n);
925 return (ecpt_pywrap(me, &p));
926 }
927
928 static void ecmmul_drop(void *pp)
929 {
930 ec_mulfactor *f = pp;
931 EC_DESTROY(&f->base);
932 MP_DROP(f->exp);
933 }
934
935 static PyObject *ecmeth_mmul(PyObject *me, PyObject *arg)
936 {
937 return (mexp_common(me, arg, sizeof(ec_mulfactor),
938 ecmmul_id, ecmmul_fill, ecmmul_exp, ecmmul_drop));
939 }
940
941 static void eccurve_pydealloc(PyObject *me)
942 {
943 ec_destroycurve(ECCURVE_C(me));
944 Py_DECREF(ECCURVE_FOBJ(me));
945 PyType_Type.tp_dealloc(me);
946 }
947
948 static PyObject *ecmeth_find(PyObject *me, PyObject *arg)
949 {
950 PyObject *x;
951 mp *xx = 0;
952 ec p = EC_INIT;
953 PyObject *rc = 0;
954
955 if (!PyArg_ParseTuple(arg, "O:find", &x)) goto end;
956 if (FIELD_PYCHECK(x) && FE_F(x) == ECCURVE_C(me)->f)
957 xx = MP_COPY(FE_X(x));
958 else if ((xx = getmp(x)) == 0)
959 goto end;
960 else
961 xx = F_IN(ECCURVE_C(me)->f, xx, xx);
962 if (EC_FIND(ECCURVE_C(me), &p, xx) == 0)
963 VALERR("not on the curve");
964 rc = ecpt_pywrap(me, &p);
965 end:
966 if (xx) MP_DROP(xx);
967 return (rc);
968 }
969
970 static PyObject *ecmeth_rand(PyObject *me, PyObject *arg, PyObject *kw)
971 {
972 static const char *const kwlist[] = { "rng", 0 };
973 grand *r = &rand_global;
974 ec p = EC_INIT;
975
976 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:rand", KWLIST,
977 convgrand, &r))
978 return (0);
979 ec_rand(ECCURVE_C(me), &p, r);
980 EC_IN(ECCURVE_C(me), &p, &p);
981 return (ecpt_pywrap(me, &p));
982 }
983
984 static PyObject *ecmeth_parse(PyObject *me, PyObject *arg)
985 {
986 char *p;
987 qd_parse qd;
988 ec_curve *c;
989 PyObject *rc = 0;
990
991 if (!PyArg_ParseTuple(arg, "s:parse", &p)) goto end;
992 qd.p = p; qd.e = 0;
993 if ((c = ec_curveparse(&qd)) == 0) VALERR(qd.e);
994 rc = Py_BuildValue("(Ns)", eccurve_pywrap(0, c), qd.p);
995 end:
996 return (rc);
997 }
998
999 static PyObject *eccurve_dopywrap(PyTypeObject *ty,
1000 PyObject *fobj, ec_curve *c)
1001 {
1002 eccurve_pyobj *cobj = newtype(ty, 0, c->ops->name);
1003 cobj->c = c;
1004 cobj->fobj = fobj;
1005 cobj->ty.ht_type.tp_basicsize = sizeof(ecpt_pyobj);
1006 cobj->ty.ht_type.tp_base = ecptcurve_pytype;
1007 Py_INCREF(ecptcurve_pytype);
1008 cobj->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
1009 Py_TPFLAGS_BASETYPE |
1010 Py_TPFLAGS_CHECKTYPES |
1011 Py_TPFLAGS_HEAPTYPE);
1012 cobj->ty.ht_type.tp_alloc = PyType_GenericAlloc;
1013 cobj->ty.ht_type.tp_free = 0;
1014 cobj->ty.ht_type.tp_new = ecpt_pynew;
1015 typeready(&cobj->ty.ht_type);
1016 return ((PyObject *)cobj);
1017 }
1018
1019 PyObject *eccurve_pywrap(PyObject *fobj, ec_curve *c)
1020 {
1021 PyTypeObject *ty;
1022
1023 if (!fobj)
1024 fobj = field_pywrap(c->f);
1025 else
1026 Py_INCREF(fobj);
1027 assert(FIELD_F(fobj) == c->f);
1028 if (STRCMP(EC_NAME(c), ==, "prime"))
1029 ty = ecprimecurve_pytype;
1030 else if (STRCMP(EC_NAME(c), ==, "primeproj"))
1031 ty = ecprimeprojcurve_pytype;
1032 else if (STRCMP(EC_NAME(c), ==, "bin"))
1033 ty = ecbincurve_pytype;
1034 else if (STRCMP(EC_NAME(c), ==, "binproj"))
1035 ty = ecbinprojcurve_pytype;
1036 else
1037 abort();
1038 return (eccurve_dopywrap(ty, fobj, c));
1039 }
1040
1041 static PyObject *eccurve_pynew(PyTypeObject *ty,
1042 ec_curve *(*make)(field *, mp *, mp *),
1043 PyObject *arg, PyObject *kw)
1044 {
1045 PyObject *fobj;
1046 PyObject *cobj = 0;
1047 static const char *const kwlist[] = { "field", "a", "b", 0 };
1048 mp *aa = 0, *bb = 0;
1049
1050 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O&O&", KWLIST,
1051 field_pytype, &fobj,
1052 convmp, &aa, convmp, &bb))
1053 goto end;
1054 Py_INCREF(fobj);
1055 cobj = eccurve_dopywrap(ty, fobj, make(FIELD_F(fobj), aa, bb));
1056 end:
1057 if (aa) MP_DROP(aa);
1058 if (bb) MP_DROP(bb);
1059 return (cobj);
1060 }
1061
1062 static PyObject *ecget_name(PyObject *me, void *hunoz)
1063 { return (TEXT_FROMSTR(EC_NAME(ECCURVE_C(me)))); }
1064
1065 static PyObject *ecget_a(PyObject *me, void *hunoz)
1066 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->a))); }
1067
1068 static PyObject *ecget_b(PyObject *me, void *hunoz)
1069 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->b))); }
1070
1071 static PyObject *ecget_field(PyObject *me, void *hunoz)
1072 { RETURN_OBJ(ECCURVE_FOBJ(me)); }
1073
1074 static PyObject *ecget_inf(PyObject *me, void *hunoz)
1075 { ec inf = EC_INIT; return (ecpt_pywrap(me, &inf)); }
1076
1077 static const PyGetSetDef eccurve_pygetset[] = {
1078 #define GETSETNAME(op, name) ec##op##_##name
1079 GET (name, "E.name -> name of this kind of curve")
1080 GET (a, "E.a -> first parameter of curve")
1081 GET (b, "E.b -> second parameter of curve")
1082 GET (field, "E.field -> finite field containing this curve")
1083 GET (inf, "E.inf -> point at infinity of this curve")
1084 #undef GETSETNAME
1085 { 0 }
1086 };
1087
1088 static const PyMethodDef eccurve_pymethods[] = {
1089 #define METHNAME(name) ecmeth_##name
1090 METH (mmul, "E.mmul([(P0, N0), (P1, N1), ...]) = N0 P0 + N1 P1 + ...")
1091 METH (find, "E.find(X) -> P")
1092 KWMETH(rand, "E.rand([rng = rand]) -> P")
1093 SMTH (parse, "parse(STR) -> (E, REST)")
1094 #undef METHNAME
1095 { 0 }
1096 };
1097
1098 static const PyTypeObject eccurve_pytype_skel = {
1099 PyVarObject_HEAD_INIT(0, 0) /* Header */
1100 "ECCurve", /* @tp_name@ */
1101 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1102 0, /* @tp_itemsize@ */
1103
1104 eccurve_pydealloc, /* @tp_dealloc@ */
1105 0, /* @tp_print@ */
1106 0, /* @tp_getattr@ */
1107 0, /* @tp_setattr@ */
1108 0, /* @tp_compare@ */
1109 0, /* @tp_repr@ */
1110 0, /* @tp_as_number@ */
1111 0, /* @tp_as_sequence@ */
1112 0, /* @tp_as_mapping@ */
1113 0, /* @tp_hash@ */
1114 0, /* @tp_call@ */
1115 0, /* @tp_str@ */
1116 0, /* @tp_getattro@ */
1117 0, /* @tp_setattro@ */
1118 0, /* @tp_as_buffer@ */
1119 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1120 Py_TPFLAGS_BASETYPE,
1121
1122 /* @tp_doc@ */
1123 "An elliptic curve. Abstract class.",
1124
1125 0, /* @tp_traverse@ */
1126 0, /* @tp_clear@ */
1127 eccurve_pyrichcompare, /* @tp_richcompare@ */
1128 0, /* @tp_weaklistoffset@ */
1129 0, /* @tp_iter@ */
1130 0, /* @tp_iternext@ */
1131 PYMETHODS(eccurve), /* @tp_methods@ */
1132 0, /* @tp_members@ */
1133 PYGETSET(eccurve), /* @tp_getset@ */
1134 0, /* @tp_base@ */
1135 0, /* @tp_dict@ */
1136 0, /* @tp_descr_get@ */
1137 0, /* @tp_descr_set@ */
1138 0, /* @tp_dictoffset@ */
1139 0, /* @tp_init@ */
1140 PyType_GenericAlloc, /* @tp_alloc@ */
1141 abstract_pynew, /* @tp_new@ */
1142 0, /* @tp_free@ */
1143 0 /* @tp_is_gc@ */
1144 };
1145
1146 static PyObject *ecprimecurve_pynew(PyTypeObject *ty,
1147 PyObject *arg, PyObject *kw)
1148 {
1149 return (eccurve_pynew(ty, ec_prime, arg, kw));
1150 }
1151
1152 static const PyTypeObject ecprimecurve_pytype_skel = {
1153 PyVarObject_HEAD_INIT(0, 0) /* Header */
1154 "ECPrimeCurve", /* @tp_name@ */
1155 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1156 0, /* @tp_itemsize@ */
1157
1158 eccurve_pydealloc, /* @tp_dealloc@ */
1159 0, /* @tp_print@ */
1160 0, /* @tp_getattr@ */
1161 0, /* @tp_setattr@ */
1162 0, /* @tp_compare@ */
1163 0, /* @tp_repr@ */
1164 0, /* @tp_as_number@ */
1165 0, /* @tp_as_sequence@ */
1166 0, /* @tp_as_mapping@ */
1167 0, /* @tp_hash@ */
1168 0, /* @tp_call@ */
1169 0, /* @tp_str@ */
1170 0, /* @tp_getattro@ */
1171 0, /* @tp_setattro@ */
1172 0, /* @tp_as_buffer@ */
1173 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1174 Py_TPFLAGS_BASETYPE,
1175
1176 /* @tp_doc@ */
1177 "ECPrimeCurve(FIELD, A, B): an elliptic curve over a prime field.\n"
1178 " Use ECPrimeProjCurve instead.",
1179
1180 0, /* @tp_traverse@ */
1181 0, /* @tp_clear@ */
1182 0, /* @tp_richcompare@ */
1183 0, /* @tp_weaklistoffset@ */
1184 0, /* @tp_iter@ */
1185 0, /* @tp_iternext@ */
1186 0, /* @tp_methods@ */
1187 0, /* @tp_members@ */
1188 0, /* @tp_getset@ */
1189 0, /* @tp_base@ */
1190 0, /* @tp_dict@ */
1191 0, /* @tp_descr_get@ */
1192 0, /* @tp_descr_set@ */
1193 0, /* @tp_dictoffset@ */
1194 0, /* @tp_init@ */
1195 PyType_GenericAlloc, /* @tp_alloc@ */
1196 ecprimecurve_pynew, /* @tp_new@ */
1197 0, /* @tp_free@ */
1198 0 /* @tp_is_gc@ */
1199 };
1200
1201 static PyObject *ecprimeprojcurve_pynew(PyTypeObject *ty,
1202 PyObject *arg, PyObject *kw)
1203 {
1204 return (eccurve_pynew(ty, ec_primeproj, arg, kw));
1205 }
1206
1207 static const PyTypeObject ecprimeprojcurve_pytype_skel = {
1208 PyVarObject_HEAD_INIT(0, 0) /* Header */
1209 "ECPrimeProjCurve", /* @tp_name@ */
1210 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1211 0, /* @tp_itemsize@ */
1212
1213 eccurve_pydealloc, /* @tp_dealloc@ */
1214 0, /* @tp_print@ */
1215 0, /* @tp_getattr@ */
1216 0, /* @tp_setattr@ */
1217 0, /* @tp_compare@ */
1218 0, /* @tp_repr@ */
1219 0, /* @tp_as_number@ */
1220 0, /* @tp_as_sequence@ */
1221 0, /* @tp_as_mapping@ */
1222 0, /* @tp_hash@ */
1223 0, /* @tp_call@ */
1224 0, /* @tp_str@ */
1225 0, /* @tp_getattro@ */
1226 0, /* @tp_setattro@ */
1227 0, /* @tp_as_buffer@ */
1228 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1229 Py_TPFLAGS_BASETYPE,
1230
1231 /* @tp_doc@ */
1232 "ECPrimeProjCurve(FIELD, A, B): an elliptic curve over a prime field\n"
1233 " using projective coordinates.",
1234
1235 0, /* @tp_traverse@ */
1236 0, /* @tp_clear@ */
1237 0, /* @tp_richcompare@ */
1238 0, /* @tp_weaklistoffset@ */
1239 0, /* @tp_iter@ */
1240 0, /* @tp_iternext@ */
1241 0, /* @tp_methods@ */
1242 0, /* @tp_members@ */
1243 0, /* @tp_getset@ */
1244 0, /* @tp_base@ */
1245 0, /* @tp_dict@ */
1246 0, /* @tp_descr_get@ */
1247 0, /* @tp_descr_set@ */
1248 0, /* @tp_dictoffset@ */
1249 0, /* @tp_init@ */
1250 PyType_GenericAlloc, /* @tp_alloc@ */
1251 ecprimeprojcurve_pynew, /* @tp_new@ */
1252 0, /* @tp_free@ */
1253 0 /* @tp_is_gc@ */
1254 };
1255
1256 static PyObject *ecbincurve_pynew(PyTypeObject *ty,
1257 PyObject *arg, PyObject *kw)
1258 {
1259 return (eccurve_pynew(ty, ec_bin, arg, kw));
1260 }
1261
1262 static const PyTypeObject ecbincurve_pytype_skel = {
1263 PyVarObject_HEAD_INIT(0, 0) /* Header */
1264 "ECBinCurve", /* @tp_name@ */
1265 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1266 0, /* @tp_itemsize@ */
1267
1268 eccurve_pydealloc, /* @tp_dealloc@ */
1269 0, /* @tp_print@ */
1270 0, /* @tp_getattr@ */
1271 0, /* @tp_setattr@ */
1272 0, /* @tp_compare@ */
1273 0, /* @tp_repr@ */
1274 0, /* @tp_as_number@ */
1275 0, /* @tp_as_sequence@ */
1276 0, /* @tp_as_mapping@ */
1277 0, /* @tp_hash@ */
1278 0, /* @tp_call@ */
1279 0, /* @tp_str@ */
1280 0, /* @tp_getattro@ */
1281 0, /* @tp_setattro@ */
1282 0, /* @tp_as_buffer@ */
1283 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1284 Py_TPFLAGS_BASETYPE,
1285
1286 /* @tp_doc@ */
1287 "ECBinCurve(FIELD, A, B): an elliptic curve over a binary field.\n"
1288 " Use ECBinProjCurve instead.",
1289
1290 0, /* @tp_traverse@ */
1291 0, /* @tp_clear@ */
1292 0, /* @tp_richcompare@ */
1293 0, /* @tp_weaklistoffset@ */
1294 0, /* @tp_iter@ */
1295 0, /* @tp_iternext@ */
1296 0, /* @tp_methods@ */
1297 0, /* @tp_members@ */
1298 0, /* @tp_getset@ */
1299 0, /* @tp_base@ */
1300 0, /* @tp_dict@ */
1301 0, /* @tp_descr_get@ */
1302 0, /* @tp_descr_set@ */
1303 0, /* @tp_dictoffset@ */
1304 0, /* @tp_init@ */
1305 PyType_GenericAlloc, /* @tp_alloc@ */
1306 ecbincurve_pynew, /* @tp_new@ */
1307 0, /* @tp_free@ */
1308 0 /* @tp_is_gc@ */
1309 };
1310
1311 static PyObject *ecbinprojcurve_pynew(PyTypeObject *ty,
1312 PyObject *arg, PyObject *kw)
1313 {
1314 return (eccurve_pynew(ty, ec_binproj, arg, kw));
1315 }
1316
1317 static const PyTypeObject ecbinprojcurve_pytype_skel = {
1318 PyVarObject_HEAD_INIT(0, 0) /* Header */
1319 "ECBinProjCurve", /* @tp_name@ */
1320 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1321 0, /* @tp_itemsize@ */
1322
1323 eccurve_pydealloc, /* @tp_dealloc@ */
1324 0, /* @tp_print@ */
1325 0, /* @tp_getattr@ */
1326 0, /* @tp_setattr@ */
1327 0, /* @tp_compare@ */
1328 0, /* @tp_repr@ */
1329 0, /* @tp_as_number@ */
1330 0, /* @tp_as_sequence@ */
1331 0, /* @tp_as_mapping@ */
1332 0, /* @tp_hash@ */
1333 0, /* @tp_call@ */
1334 0, /* @tp_str@ */
1335 0, /* @tp_getattro@ */
1336 0, /* @tp_setattro@ */
1337 0, /* @tp_as_buffer@ */
1338 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1339 Py_TPFLAGS_BASETYPE,
1340
1341 /* @tp_doc@ */
1342 "ECBinProjCurve(FIELD, A, B): an elliptic curve over a binary field,\n"
1343 " using projective coordinates.",
1344
1345 0, /* @tp_traverse@ */
1346 0, /* @tp_clear@ */
1347 0, /* @tp_richcompare@ */
1348 0, /* @tp_weaklistoffset@ */
1349 0, /* @tp_iter@ */
1350 0, /* @tp_iternext@ */
1351 0, /* @tp_methods@ */
1352 0, /* @tp_members@ */
1353 0, /* @tp_getset@ */
1354 0, /* @tp_base@ */
1355 0, /* @tp_dict@ */
1356 0, /* @tp_descr_get@ */
1357 0, /* @tp_descr_set@ */
1358 0, /* @tp_dictoffset@ */
1359 0, /* @tp_init@ */
1360 PyType_GenericAlloc, /* @tp_alloc@ */
1361 ecbinprojcurve_pynew, /* @tp_new@ */
1362 0, /* @tp_free@ */
1363 0 /* @tp_is_gc@ */
1364 };
1365
1366 /*----- Curve info --------------------------------------------------------*/
1367
1368 void ecinfo_copy(ec_info *eic, const ec_info *ei)
1369 {
1370 eic->c = eccurve_copy(ei->c);
1371 EC_CREATE(&eic->g);
1372 EC_COPY(&eic->g, &ei->g);
1373 eic->r = MP_COPY(ei->r);
1374 eic->h = MP_COPY(ei->h);
1375 }
1376
1377 PyObject *ecinfo_pywrap(ec_info *ei)
1378 {
1379 ecinfo_pyobj *o;
1380
1381 o = PyObject_NEW(ecinfo_pyobj, ecinfo_pytype);
1382 o->ei = *ei;
1383 o->cobj = eccurve_pywrap(0, o->ei.c);
1384 Py_INCREF(o->cobj);
1385 return ((PyObject *)o);
1386 }
1387
1388 static void ecinfo_pydealloc(PyObject *me)
1389 {
1390 ec_info *ei = ECINFO_EI(me);
1391 EC_DESTROY(&ei->g);
1392 MP_DROP(ei->r);
1393 MP_DROP(ei->h);
1394 Py_DECREF(ECINFO_COBJ(me));
1395 FREEOBJ(me);
1396 }
1397
1398 static PyObject *ecinfo_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
1399 {
1400 ec_info ei = { 0 };
1401 PyObject *e, *g;
1402 static const char *const kwlist[] = { "curve", "G", "r", "h", 0 };
1403 ecinfo_pyobj *rc = 0;
1404
1405 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O!O&O&:new", KWLIST,
1406 eccurve_pytype, &e, ecpt_pytype, &g,
1407 convmp, &ei.r, convmp, &ei.h))
1408 goto end;
1409 if (ECPT_C(g) != ECCURVE_C(e) && !ec_samep(ECPT_C(g), ECCURVE_C(e)))
1410 TYERR("point not from this curve");
1411 ei.c = ECCURVE_C(e);
1412 EC_CREATE(&ei.g);
1413 EC_OUT(ei.c, &ei.g, ECPT_P(g));
1414 rc = (ecinfo_pyobj *)ty->tp_alloc(ty, 0);
1415 rc->ei = ei;
1416 rc->cobj = e;
1417 Py_INCREF(rc->cobj);
1418 return ((PyObject *)rc);
1419
1420 end:
1421 mp_drop(ei.r);
1422 mp_drop(ei.h);
1423 return (0);
1424 }
1425
1426 static PyObject *eimeth_parse(PyObject *me, PyObject *arg)
1427 {
1428 char *p;
1429 qd_parse qd;
1430 ec_info ei;
1431 PyObject *rc = 0;
1432
1433 if (!PyArg_ParseTuple(arg, "s:parse", &p)) goto end;
1434 qd.p = p; qd.e = 0;
1435 if (ec_infoparse(&qd, &ei)) VALERR(qd.e);
1436 rc = Py_BuildValue("(Ns)", ecinfo_pywrap(&ei), qd.p);
1437 end:
1438 return (rc);
1439 }
1440
1441 static PyObject *ecinfo_pyrichcompare(PyObject *x, PyObject *y, int op)
1442 {
1443 int b = ec_sameinfop(ECINFO_EI(x), ECINFO_EI(y));
1444 switch (op) {
1445 case Py_EQ: break;
1446 case Py_NE: b = !b;
1447 default: TYERR("can't order elliptic curve infos");
1448 }
1449 return (getbool(b));
1450 end:
1451 return (0);
1452 }
1453
1454 static PyObject *eimeth_check(PyObject *me, PyObject *arg, PyObject *kw)
1455 {
1456 static const char *const kwlist[] = { "rng", 0 };
1457 grand *r = &rand_global;
1458 const char *p;
1459
1460 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:check", KWLIST,
1461 convgrand, &r))
1462 goto end;
1463 if ((p = ec_checkinfo(ECINFO_EI(me), r)) != 0)
1464 VALERR(p);
1465 RETURN_ME;
1466 end:
1467 return (0);
1468 }
1469
1470 static PyObject *eiget_curve(PyObject *me, void *hunoz)
1471 { RETURN_OBJ(ECINFO_COBJ(me)); }
1472
1473 static PyObject *eiget_G(PyObject *me, void *hunoz)
1474 {
1475 ec_info *ei = ECINFO_EI(me);
1476 ec p = EC_INIT;
1477 EC_IN(ei->c, &p, &ei->g);
1478 return (ecpt_pywrap(ECINFO_COBJ(me), &p));
1479 }
1480
1481 static PyObject *eiget_r(PyObject *me, void *hunoz)
1482 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->r))); }
1483
1484 static PyObject *eiget_h(PyObject *me, void *hunoz)
1485 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->h))); }
1486
1487 static const PyGetSetDef ecinfo_pygetset[] = {
1488 #define GETSETNAME(op, name) ei##op##_##name
1489 GET (curve, "I.curve -> the elliptic curve")
1490 GET (G, "I.G -> generator point for the group")
1491 GET (r, "I.r -> order of the group (and hence of G")
1492 GET (h, "I.h -> cofactor of the group")
1493 #undef GETSETNAME
1494 { 0 }
1495 };
1496
1497 static const PyMethodDef ecinfo_pymethods[] = {
1498 #define METHNAME(name) eimeth_##name
1499 KWMETH(check, "I.check([rng = rand]) -> None")
1500 SMTH (parse, "parse(STR) -> (I, REST)")
1501 #undef METHNAME
1502 { 0 }
1503 };
1504
1505 static const PyTypeObject ecinfo_pytype_skel = {
1506 PyVarObject_HEAD_INIT(0, 0) /* Header */
1507 "ECInfo", /* @tp_name@ */
1508 sizeof(ecinfo_pyobj), /* @tp_basicsize@ */
1509 0, /* @tp_itemsize@ */
1510
1511 ecinfo_pydealloc, /* @tp_dealloc@ */
1512 0, /* @tp_print@ */
1513 0, /* @tp_getattr@ */
1514 0, /* @tp_setattr@ */
1515 0, /* @tp_compare@ */
1516 0, /* @tp_repr@ */
1517 0, /* @tp_as_number@ */
1518 0, /* @tp_as_sequence@ */
1519 0, /* @tp_as_mapping@ */
1520 0, /* @tp_hash@ */
1521 0, /* @tp_call@ */
1522 0, /* @tp_str@ */
1523 0, /* @tp_getattro@ */
1524 0, /* @tp_setattro@ */
1525 0, /* @tp_as_buffer@ */
1526 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1527 Py_TPFLAGS_BASETYPE,
1528
1529 /* @tp_doc@ */
1530 "ECInfo(CURVE, G, R, H): elliptic curve domain parameters.",
1531
1532 0, /* @tp_traverse@ */
1533 0, /* @tp_clear@ */
1534 ecinfo_pyrichcompare, /* @tp_richcompare@ */
1535 0, /* @tp_weaklistoffset@ */
1536 0, /* @tp_iter@ */
1537 0, /* @tp_iternext@ */
1538 PYMETHODS(ecinfo), /* @tp_methods@ */
1539 0, /* @tp_members@ */
1540 PYGETSET(ecinfo), /* @tp_getset@ */
1541 0, /* @tp_base@ */
1542 0, /* @tp_dict@ */
1543 0, /* @tp_descr_get@ */
1544 0, /* @tp_descr_set@ */
1545 0, /* @tp_dictoffset@ */
1546 0, /* @tp_init@ */
1547 PyType_GenericAlloc, /* @tp_alloc@ */
1548 ecinfo_pynew, /* @tp_new@ */
1549 0, /* @tp_free@ */
1550 0 /* @tp_is_gc@ */
1551 };
1552
1553 /*----- Setup -------------------------------------------------------------*/
1554
1555 static const struct nameval consts[] = {
1556 CONST(EC_XONLY), CONST(EC_YBIT), CONST(EC_LSB),
1557 CONST(EC_CMPR), CONST(EC_EXPLY), CONST(EC_SORT),
1558 { 0 }
1559 };
1560
1561 void ec_pyinit(void)
1562 {
1563 INITTYPE(ecpt, root);
1564 INITTYPE(ecptcurve, ecpt);
1565 INITTYPE(eccurve, type);
1566 INITTYPE(ecprimecurve, eccurve);
1567 INITTYPE(ecprimeprojcurve, ecprimecurve);
1568 INITTYPE(ecbincurve, eccurve);
1569 INITTYPE(ecbinprojcurve, ecbincurve);
1570 INITTYPE(ecinfo, root);
1571 }
1572
1573 static const char *ec_namefn(const void *p)
1574 { const ecentry *ec = p; return (ec->name); }
1575
1576 static int ec_ixfn(const void *p)
1577 {
1578 const ecentry *ec = p;
1579 int i;
1580
1581 for (i = 0; ectab[i].name; i++)
1582 if (ectab[i].data == ec->data) return (i);
1583 return (-1);
1584 }
1585
1586 static PyObject *ec_valfn(int i)
1587 {
1588 ec_info ei;
1589
1590 ec_infofromdata(&ei, ectab[i].data);
1591 return (ecinfo_pywrap(&ei));
1592 }
1593
1594 void ec_pyinsert(PyObject *mod)
1595 {
1596 INSERT("ECPt", ecpt_pytype);
1597 INSERT("ECPtCurve", ecptcurve_pytype);
1598 INSERT("ECCurve", eccurve_pytype);
1599 INSERT("ECPrimeCurve", ecprimecurve_pytype);
1600 INSERT("ECPrimeProjCurve", ecprimeprojcurve_pytype);
1601 INSERT("ECBinCurve", ecbincurve_pytype);
1602 INSERT("ECBinProjCurve", ecbinprojcurve_pytype);
1603 INSERT("ECInfo", ecinfo_pytype);
1604 INSERT("eccurves", make_grouptab(ectab, sizeof(*ectab),
1605 ec_namefn, ec_ixfn, ec_valfn));
1606 setconstants(mod, consts);
1607 }
1608
1609 /*----- That's all, folks -------------------------------------------------*/
Catacomb cryptographic library -- Python bindings