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