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