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