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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) || (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 Py_hash_t 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 *epmeth_frombuf(PyObject *me, PyObject *arg)
312 {
313 buf b;
314 char *p;
315 Py_ssize_t sz;
316 PyObject *rc = 0;
317 ec pp = EC_INIT;
318
319 if (!PyArg_ParseTuple(arg, "s#:frombuf", &p, &sz)) goto end;
320 buf_init(&b, p, sz);
321 if (buf_getec(&b, &pp)) VALERR("malformed data");
322 rc = Py_BuildValue("(NN)", ecpt_pywrapout(me, &pp),
323 bytestring_pywrapbuf(&b));
324 end:
325 return (rc);
326 }
327
328 static PyObject *epmeth_parse(PyObject *me, PyObject *arg)
329 {
330 char *p;
331 qd_parse qd;
332 PyObject *rc = 0;
333 ec pp = EC_INIT;
334
335 if (!PyArg_ParseTuple(arg, "s:parse", &p)) goto end;
336 qd.p = p; qd.e = 0;
337 if (!ec_ptparse(&qd, &pp)) VALERR(qd.e);
338 rc = Py_BuildValue("(Ns)", ecpt_pywrapout(me, &pp), qd.p);
339 end:
340 return (rc);
341 }
342
343 static PyObject *epmeth_fromraw(PyObject *me, PyObject *arg)
344 {
345 char *p;
346 Py_ssize_t len;
347 buf b;
348 PyObject *rc = 0;
349 ec_curve *cc;
350 ec pp = EC_INIT;
351
352 if (!PyArg_ParseTuple(arg, "s#:fromraw", &me, &p, &len)) return (0);
353 buf_init(&b, p, len);
354 cc = ECCURVE_C(me);
355 if (ec_getraw(cc, &b, &pp))
356 VALERR("bad point");
357 EC_IN(cc, &pp, &pp);
358 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
359 end:
360 return (rc);
361 }
362
363 static PyObject *epmeth_os2ecp(PyObject *me, PyObject *arg, PyObject *kw)
364 {
365 char *p;
366 Py_ssize_t len;
367 buf b;
368 PyObject *rc = 0;
369 ec_curve *cc;
370 unsigned f = EC_XONLY | EC_LSB | EC_SORT | EC_EXPLY;
371 ec pp = EC_INIT;
372 static const char *const kwlist[] = { "buf", "flags", 0 };
373
374 if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#|O&:os2ecp", KWLIST,
375 &p, &len, convuint, &f))
376 return (0);
377 buf_init(&b, p, len);
378 cc = ECCURVE_C(me);
379 if (ec_os2ecp(cc, f, &b, &pp)) VALERR("bad point");
380 EC_IN(cc, &pp, &pp);
381 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
382 end:
383 return (rc);
384 }
385
386 static PyObject *epncget_ix(PyObject *me, void *hunoz)
387 {
388 ec p = EC_INIT;
389 PyObject *rc;
390 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
391 getecptout(&p, me);
392 rc = mp_pywrap(MP_COPY(p.x));
393 EC_DESTROY(&p);
394 return (rc);
395 }
396
397 static PyObject *epncget_iy(PyObject *me, void *hunoz)
398 {
399 ec p = EC_INIT;
400 PyObject *rc;
401 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
402 getecptout(&p, me);
403 rc = mp_pywrap(MP_COPY(p.y));
404 EC_DESTROY(&p);
405 return (rc);
406 }
407
408 static PyObject *epncget_point(PyObject *me, void *hunoz)
409 { RETURN_ME; }
410
411 static PyObject *epget_point(PyObject *me, void *hunoz)
412 {
413 ec p = EC_INIT;
414 getecptout(&p, me);
415 return (ecpt_pywrapout(ecpt_pytype, &p));
416 }
417
418 static PyObject *epget_x(PyObject *me, void *hunoz)
419 {
420 ec_curve *c = ECPT_C(me);
421 ec *pp = ECPT_P(me);
422 PyObject *fobj = ECPT_FOBJ(me);
423 ec p = EC_INIT;
424 PyObject *rc;
425
426 if (EC_ATINF(pp)) RETURN_NONE;
427 EC_OUT(c, &p, pp);
428 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.x));
429 EC_DESTROY(&p);
430 return (rc);
431 }
432
433 static PyObject *epget_y(PyObject *me, void *hunoz)
434 {
435 ec_curve *c = ECPT_C(me);
436 ec *pp = ECPT_P(me);
437 PyObject *fobj = ECPT_FOBJ(me);
438 ec p = EC_INIT;
439 PyObject *rc;
440
441 if (EC_ATINF(pp)) RETURN_NONE;
442 EC_OUT(c, &p, pp);
443 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.y));
444 EC_DESTROY(&p);
445 return (rc);
446 }
447
448 static PyObject *epget__x(PyObject *me, void *hunoz)
449 {
450 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
451 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->x)));
452 }
453
454 static PyObject *epget__y(PyObject *me, void *hunoz)
455 {
456 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
457 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->y)));
458 }
459
460 static PyObject *epget__z(PyObject *me, void *hunoz)
461 {
462 if (EC_ATINF(ECPT_P(me)) || !ECPT_P(me)->z) RETURN_NONE;
463 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->z)));
464 }
465
466 static mp *coord_in(field *f, PyObject *x)
467 {
468 mp *xx;
469 if (FE_PYCHECK(x) && FE_F(x) == f)
470 return (MP_COPY(FE_X(x)));
471 else if ((xx = getmp(x)) == 0)
472 return (0);
473 else
474 return (F_IN(f, xx, xx));
475 }
476
477 static int ecptxl_3(ec_curve *c, ec *p,
478 PyObject *x, PyObject *y, PyObject *z)
479 {
480 int rc = -1;
481
482 if (!x || !y || !z) TYERR("missing argument");
483 if (!c) VALERR("internal form with no curve!");
484 if ((p->x = coord_in(c->f, x)) == 0 ||
485 (p->y = coord_in(c->f, y)) == 0 ||
486 (z != Py_None && (p->z = coord_in(c->f, z)) == 0))
487 goto end;
488 if (!p->z) p->z = MP_COPY(c->f->one); /* just in case */
489 rc = 0;
490 end:
491 return (rc);
492 }
493
494 static int ecptxl_2(ec_curve *c, ec *p, PyObject *x, PyObject *y)
495 {
496 int rc = -1;
497
498 if (!x || !y) TYERR("missing argument");
499 if ((p->x = getmp(x)) == 0 ||
500 (p->y = getmp(y)) == 0)
501 goto end;
502 if (c) EC_IN(c, p, p);
503 rc = 0;
504 end:
505 return (rc);
506 }
507
508 static int ecptxl_1(ec_curve *c, ec *p, PyObject *x)
509 {
510 int rc = -1;
511 PyObject *y = 0, *z = 0, *t = 0;
512 mp *xx = 0;
513 const void *q;
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 (PyString_Check(x)) {
524 if (PyObject_AsReadBuffer(x, &q, &n))
525 goto end;
526 qd.p = q;
527 qd.e = 0;
528 if (!ec_ptparse(&qd, p))
529 VALERR(qd.e);
530 goto fix;
531 } else if (c && (xx = tomp(x)) != 0) {
532 xx = F_IN(c->f, xx, xx);
533 if (!EC_FIND(c, p, xx)) VALERR("not on the curve");
534 } else if (PySequence_Check(x)) {
535 t = x; x = 0;
536 n = PySequence_Size(t); if (n < 0) goto end;
537 if (n != 2 && (n != 3 || !c))
538 TYERR("want sequence of two or three items");
539 if ((x = PySequence_GetItem(t, 0)) == 0 ||
540 (y = PySequence_GetItem(t, 1)) == 0 ||
541 (n == 3 && (z = PySequence_GetItem(t, 2)) == 0))
542 goto end;
543 rc = (n == 2) ? ecptxl_2(c, p, x, y) : ecptxl_3(c, p, x, y, z);
544 goto end;
545 } else
546 TYERR("can't convert to curve point");
547 goto ok;
548
549 fix:
550 if (c) EC_IN(c, p, p);
551 ok:
552 rc = 0;
553 end:
554 Py_XDECREF(x); Py_XDECREF(y); Py_XDECREF(z); Py_XDECREF(t);
555 mp_drop(xx);
556 return (rc);
557 }
558
559 static int ecptxl(ec_curve *c, ec *p, PyObject *x, PyObject *y, PyObject *z)
560 {
561 if (z)
562 return (ecptxl_3(c, p, x, y, z));
563 else if (y)
564 return (ecptxl_2(c, p, x, y));
565 else
566 return (ecptxl_1(c, p, x));
567 }
568
569 static PyObject *ecptnc_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
570 {
571 PyObject *x = 0, *y = 0, *z = 0;
572 ec p = EC_INIT;
573 static const char *const kwlist[] = { "x", "y", 0 };
574
575 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OO:new", KWLIST, &x, &y) ||
576 ecptxl(0, &p, x, y, z))
577 goto end;
578 return (ecpt_pywrapout(ty, &p));
579 end:
580 mp_drop(p.x); mp_drop(p.y); mp_drop(p.z);
581 return (0);
582 }
583
584 static PyObject *ecpt_pyint(PyObject *me)
585 {
586 ec p = EC_INIT;
587 long l;
588 PyObject *rc = 0;
589 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
590 getecptout(&p, me);
591 if (!mp_tolong_checked(p.x, &l, 0)) rc = PyInt_FromLong(l);
592 else rc = mp_topylong(p.x);
593 end:
594 EC_DESTROY(&p);
595 return (rc);
596 }
597
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
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 0, /* @nb_divide@ */
649 0, /* @nb_remainder@ */
650 0, /* @nb_divmod@ */
651 0, /* @nb_power@ */
652 0, /* @nb_negative@ */
653 0, /* @nb_positive@ */
654 0, /* @nb_absolute@ */
655 ecpt_pynonzerop, /* @nb_nonzero@ */
656 0, /* @nb_invert@ */
657 0, /* @nb_lshift@ */
658 0, /* @nb_rshift@ */
659 0, /* @nb_and@ */
660 0, /* @nb_xor@ */
661 0, /* @nb_or@ */
662 0, /* @nb_coerce@ */
663 ecpt_pyint, /* @nb_int@ */
664 ecpt_pylong, /* @nb_long@ */
665 0, /* @nb_float@ */
666 0, /* @nb_oct@ */
667 0, /* @nb_hex@ */
668
669 0, /* @nb_inplace_add@ */
670 0, /* @nb_inplace_subtract@ */
671 0, /* @nb_inplace_multiply@ */
672 0, /* @nb_inplace_divide@ */
673 0, /* @nb_inplace_remainder@ */
674 0, /* @nb_inplace_power@ */
675 0, /* @nb_inplace_lshift@ */
676 0, /* @nb_inplace_rshift@ */
677 0, /* @nb_inplace_and@ */
678 0, /* @nb_inplace_xor@ */
679 0, /* @nb_inplace_or@ */
680
681 0, /* @nb_floor_divide@ */
682 0, /* @nb_true_divide@ */
683 0, /* @nb_inplace_floor_divide@ */
684 0, /* @nb_inplace_true_divide@ */
685 };
686
687 static const PyTypeObject ecpt_pytype_skel = {
688 PyVarObject_HEAD_INIT(0, 0) /* Header */
689 "ECPt", /* @tp_name@ */
690 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
691 0, /* @tp_itemsize@ */
692
693 ecpt_pydealloc, /* @tp_dealloc@ */
694 0, /* @tp_print@ */
695 0, /* @tp_getattr@ */
696 0, /* @tp_setattr@ */
697 0, /* @tp_compare@ */
698 0, /* @tp_repr@ */
699 PYNUMBER(ecpt), /* @tp_as_number@ */
700 0, /* @tp_as_sequence@ */
701 0, /* @tp_as_mapping@ */
702 ecpt_pyhash, /* @tp_hash@ */
703 0, /* @tp_call@ */
704 0, /* @tp_str@ */
705 0, /* @tp_getattro@ */
706 0, /* @tp_setattro@ */
707 0, /* @tp_as_buffer@ */
708 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
709 Py_TPFLAGS_CHECKTYPES |
710 Py_TPFLAGS_BASETYPE,
711
712 /* @tp_doc@ */
713 "ECPt([X, [Y]]): elliptic curve points, not associated with any curve.\n"
714 " X alone may be None, an existing point, a string 'X, Y', an\n"
715 " x-coordinate, or a pair (X, Y); X and Y should be a coordinate pair.",
716
717 0, /* @tp_traverse@ */
718 0, /* @tp_clear@ */
719 ecpt_pyrichcompare, /* @tp_richcompare@ */
720 0, /* @tp_weaklistoffset@ */
721 0, /* @tp_iter@ */
722 0, /* @tp_iternext@ */
723 PYMETHODS(ecptnc), /* @tp_methods@ */
724 0, /* @tp_members@ */
725 PYGETSET(ecptnc), /* @tp_getset@ */
726 0, /* @tp_base@ */
727 0, /* @tp_dict@ */
728 0, /* @tp_descr_get@ */
729 0, /* @tp_descr_set@ */
730 0, /* @tp_dictoffset@ */
731 0, /* @tp_init@ */
732 PyType_GenericAlloc, /* @tp_alloc@ */
733 ecptnc_pynew, /* @tp_new@ */
734 0, /* @tp_free@ */
735 0 /* @tp_is_gc@ */
736 };
737
738 static const PyMemberDef ecpt_pymembers[] = {
739 #define MEMBERSTRUCT ecpt_pyobj
740 MEMRNM(curve, T_OBJECT, ob_type, READONLY,
741 "P.curve -> elliptic curve containing P")
742 #undef MEMBERSTRUCT
743 { 0 }
744 };
745
746 static const PyGetSetDef ecpt_pygetset[] = {
747 #define GETSETNAME(op, name) ep##op##_##name
748 GET (point, "P.point -> standalone curve point")
749 GET (x, "P.x -> Cartesian x coordinate of P")
750 GET (y, "P.y -> Cartesian y coordinate of P")
751 GET (_x, "P._x -> internal x coordinate of P")
752 GET (_y, "P._y -> internal y coordinate of P")
753 GET (_z, "P._z -> internal z coordinate of P, or None")
754 #undef GETSETNAME
755 { 0 }
756 };
757
758 static const PyMethodDef ecpt_pymethods[] = {
759 #define METHNAME(func) epmeth_##func
760 NAMETH(toraw, "X.toraw() -> BIN")
761 KWMETH(ec2osp, "X.ec2osp([flags = EC_EXPLY]) -> BIN")
762 NAMETH(dbl, "X.dbl() -> X + X")
763 NAMETH(oncurvep, "X.oncurvep() -> BOOL")
764 CMTH (fromraw, "fromraw(STR) -> (P, REST)")
765 KWCMTH(os2ecp, "os2ecp(STR, [flags = ...]) -> (P, REST)")
766 #undef METHNAME
767 { 0 }
768 };
769
770 static const PyNumberMethods ecptcurve_pynumber = {
771 ecpt_pyadd, /* @nb_add@ */
772 ecpt_pysub, /* @nb_subtract@ */
773 ecpt_pymul, /* @nb_multiply@ */
774 0, /* @nb_divide@ */
775 0, /* @nb_remainder@ */
776 0, /* @nb_divmod@ */
777 0, /* @nb_power@ */
778 ecpt_pyneg, /* @nb_negative@ */
779 ecpt_pyid, /* @nb_positive@ */
780 0, /* @nb_absolute@ */
781 0, /* @nb_nonzero@ */
782 0, /* @nb_invert@ */
783 0, /* @nb_lshift@ */
784 0, /* @nb_rshift@ */
785 0, /* @nb_and@ */
786 0, /* @nb_xor@ */
787 0, /* @nb_or@ */
788 0, /* @nb_coerce@ */
789 0, /* @nb_int@ */
790 0, /* @nb_long@ */
791 0, /* @nb_float@ */
792 0, /* @nb_oct@ */
793 0, /* @nb_hex@ */
794
795 0, /* @nb_inplace_add@ */
796 0, /* @nb_inplace_subtract@ */
797 0, /* @nb_inplace_multiply@ */
798 0, /* @nb_inplace_divide@ */
799 0, /* @nb_inplace_remainder@ */
800 0, /* @nb_inplace_power@ */
801 0, /* @nb_inplace_lshift@ */
802 0, /* @nb_inplace_rshift@ */
803 0, /* @nb_inplace_and@ */
804 0, /* @nb_inplace_xor@ */
805 0, /* @nb_inplace_or@ */
806
807 0, /* @nb_floor_divide@ */
808 0, /* @nb_true_divide@ */
809 0, /* @nb_inplace_floor_divide@ */
810 0, /* @nb_inplace_true_divide@ */
811 };
812
813 static const PyTypeObject ecptcurve_pytype_skel = {
814 PyVarObject_HEAD_INIT(0, 0) /* Header */
815 "ECPtCurve", /* @tp_name@ */
816 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
817 0, /* @tp_itemsize@ */
818
819 ecpt_pydealloc, /* @tp_dealloc@ */
820 0, /* @tp_print@ */
821 0, /* @tp_getattr@ */
822 0, /* @tp_setattr@ */
823 0, /* @tp_compare@ */
824 0, /* @tp_repr@ */
825 PYNUMBER(ecptcurve), /* @tp_as_number@ */
826 0, /* @tp_as_sequence@ */
827 0, /* @tp_as_mapping@ */
828 0, /* @tp_hash@ */
829 0, /* @tp_call@ */
830 0, /* @tp_str@ */
831 0, /* @tp_getattro@ */
832 0, /* @tp_setattro@ */
833 0, /* @tp_as_buffer@ */
834 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
835 Py_TPFLAGS_CHECKTYPES |
836 Py_TPFLAGS_BASETYPE,
837
838 /* @tp_doc@ */
839 "Elliptic curve points; abstract base class for points on given curves.",
840
841 0, /* @tp_traverse@ */
842 0, /* @tp_clear@ */
843 0, /* @tp_richcompare@ */
844 0, /* @tp_weaklistoffset@ */
845 0, /* @tp_iter@ */
846 0, /* @tp_iternext@ */
847 PYMETHODS(ecpt), /* @tp_methods@ */
848 PYMEMBERS(ecpt), /* @tp_members@ */
849 PYGETSET(ecpt), /* @tp_getset@ */
850 0, /* @tp_base@ */
851 0, /* @tp_dict@ */
852 0, /* @tp_descr_get@ */
853 0, /* @tp_descr_set@ */
854 0, /* @tp_dictoffset@ */
855 0, /* @tp_init@ */
856 PyType_GenericAlloc, /* @tp_alloc@ */
857 abstract_pynew, /* @tp_new@ */
858 0, /* @tp_free@ */
859 0 /* @tp_is_gc@ */
860 };
861
862 /*----- Elliptic curves themselves ----------------------------------------*/
863
864 static PyObject *eccurve_pyrichcompare(PyObject *x, PyObject *y, int op)
865 {
866 int b;
867
868 assert(ECCURVE_PYCHECK(x));
869 if (!ECCURVE_PYCHECK(y)) RETURN_NOTIMPL;
870 b = ec_samep(ECCURVE_C(x), ECCURVE_C(y));
871 switch (op) {
872 case Py_EQ: break;
873 case Py_NE: b = !b; break;
874 default: TYERR("can't order elliptic curves");
875 }
876 return (getbool(b));
877 end:
878 return (0);
879 }
880
881 static PyObject *ecmmul_id(PyObject *me)
882 { ec p = EC_INIT; return (ecpt_pywrap(me, &p)); }
883
884 static int ecmmul_fill(void *pp, PyObject *me, PyObject *x, PyObject *m)
885 {
886 ec_mulfactor *f = pp;
887
888 EC_CREATE(&f->base);
889 if (getecpt(ECCURVE_C(me), &f->base, x) ||
890 (f->exp = getmp(m)) == 0)
891 return (-1);
892 return (0);
893 }
894
895 static PyObject *ecmmul_exp(PyObject *me, void *pp, int n)
896 {
897 ec p = EC_INIT;
898 ec_immul(ECCURVE_C(me), &p, pp, n);
899 return (ecpt_pywrap(me, &p));
900 }
901
902 static void ecmmul_drop(void *pp)
903 {
904 ec_mulfactor *f = pp;
905 EC_DESTROY(&f->base);
906 MP_DROP(f->exp);
907 }
908
909 static PyObject *ecmeth_mmul(PyObject *me, PyObject *arg)
910 {
911 return (mexp_common(me, arg, sizeof(ec_mulfactor),
912 ecmmul_id, ecmmul_fill, ecmmul_exp, ecmmul_drop));
913 }
914
915 static void eccurve_pydealloc(PyObject *me)
916 {
917 ec_destroycurve(ECCURVE_C(me));
918 Py_DECREF(ECCURVE_FOBJ(me));
919 PyType_Type.tp_dealloc(me);
920 }
921
922 static PyObject *ecmeth_find(PyObject *me, PyObject *arg)
923 {
924 PyObject *x;
925 mp *xx = 0;
926 ec p = EC_INIT;
927 PyObject *rc = 0;
928
929 if (!PyArg_ParseTuple(arg, "O:find", &x)) goto end;
930 if (FIELD_PYCHECK(x) && FE_F(x) == ECCURVE_C(me)->f)
931 xx = MP_COPY(FE_X(x));
932 else if ((xx = getmp(x)) == 0)
933 goto end;
934 else
935 xx = F_IN(ECCURVE_C(me)->f, xx, xx);
936 if (EC_FIND(ECCURVE_C(me), &p, xx) == 0)
937 VALERR("not on the curve");
938 rc = ecpt_pywrap(me, &p);
939 end:
940 if (xx) MP_DROP(xx);
941 return (rc);
942 }
943
944 static PyObject *ecmeth_rand(PyObject *me, PyObject *arg, PyObject *kw)
945 {
946 static const char *const kwlist[] = { "rng", 0 };
947 grand *r = &rand_global;
948 ec p = EC_INIT;
949
950 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:rand", KWLIST,
951 convgrand, &r))
952 return (0);
953 ec_rand(ECCURVE_C(me), &p, r);
954 EC_IN(ECCURVE_C(me), &p, &p);
955 return (ecpt_pywrap(me, &p));
956 }
957
958 static PyObject *ecmeth_parse(PyObject *me, PyObject *arg)
959 {
960 char *p;
961 qd_parse qd;
962 ec_curve *c;
963 PyObject *rc = 0;
964
965 if (!PyArg_ParseTuple(arg, "s:parse", &p)) goto end;
966 qd.p = p; qd.e = 0;
967 if ((c = ec_curveparse(&qd)) == 0) VALERR(qd.e);
968 rc = eccurve_pywrap(0, c);
969 end:
970 return (rc);
971 }
972
973 static PyObject *eccurve_dopywrap(PyTypeObject *ty,
974 PyObject *fobj, ec_curve *c)
975 {
976 eccurve_pyobj *cobj = newtype(ty, 0, c->ops->name);
977 cobj->c = c;
978 cobj->fobj = fobj;
979 cobj->ty.ht_type.tp_basicsize = sizeof(ecpt_pyobj);
980 cobj->ty.ht_type.tp_base = ecptcurve_pytype;
981 Py_INCREF(ecptcurve_pytype);
982 cobj->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
983 Py_TPFLAGS_BASETYPE |
984 Py_TPFLAGS_CHECKTYPES |
985 Py_TPFLAGS_HEAPTYPE);
986 cobj->ty.ht_type.tp_alloc = PyType_GenericAlloc;
987 cobj->ty.ht_type.tp_free = 0;
988 cobj->ty.ht_type.tp_new = ecpt_pynew;
989 typeready(&cobj->ty.ht_type);
990 return ((PyObject *)cobj);
991 }
992
993 PyObject *eccurve_pywrap(PyObject *fobj, ec_curve *c)
994 {
995 PyTypeObject *ty;
996
997 if (!fobj)
998 fobj = field_pywrap(c->f);
999 else
1000 Py_INCREF(fobj);
1001 assert(FIELD_F(fobj) == c->f);
1002 if (STRCMP(EC_NAME(c), ==, "prime"))
1003 ty = ecprimecurve_pytype;
1004 else if (STRCMP(EC_NAME(c), ==, "primeproj"))
1005 ty = ecprimeprojcurve_pytype;
1006 else if (STRCMP(EC_NAME(c), ==, "bin"))
1007 ty = ecbincurve_pytype;
1008 else if (STRCMP(EC_NAME(c), ==, "binproj"))
1009 ty = ecbinprojcurve_pytype;
1010 else
1011 abort();
1012 return (eccurve_dopywrap(ty, fobj, c));
1013 }
1014
1015 static PyObject *eccurve_pynew(PyTypeObject *ty,
1016 ec_curve *(*make)(field *, mp *, mp *),
1017 PyObject *arg, PyObject *kw)
1018 {
1019 PyObject *fobj;
1020 PyObject *cobj = 0;
1021 static const char *const kwlist[] = { "field", "a", "b", 0 };
1022 mp *aa = 0, *bb = 0;
1023
1024 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O&O&", KWLIST,
1025 field_pytype, &fobj,
1026 convmp, &aa, convmp, &bb))
1027 goto end;
1028 Py_INCREF(fobj);
1029 cobj = eccurve_dopywrap(ty, fobj, make(FIELD_F(fobj), aa, bb));
1030 end:
1031 if (aa) MP_DROP(aa);
1032 if (bb) MP_DROP(bb);
1033 return (cobj);
1034 }
1035
1036 static PyObject *ecget_name(PyObject *me, void *hunoz)
1037 { return (PyString_FromString(EC_NAME(ECCURVE_C(me)))); }
1038
1039 static PyObject *ecget_a(PyObject *me, void *hunoz)
1040 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->a))); }
1041
1042 static PyObject *ecget_b(PyObject *me, void *hunoz)
1043 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->b))); }
1044
1045 static PyObject *ecget_field(PyObject *me, void *hunoz)
1046 { RETURN_OBJ(ECCURVE_FOBJ(me)); }
1047
1048 static PyObject *ecget_inf(PyObject *me, void *hunoz)
1049 { ec inf = EC_INIT; return (ecpt_pywrap(me, &inf)); }
1050
1051 static const PyGetSetDef eccurve_pygetset[] = {
1052 #define GETSETNAME(op, name) ec##op##_##name
1053 GET (name, "E.name -> name of this kind of curve")
1054 GET (a, "E.a -> first parameter of curve")
1055 GET (b, "E.b -> second parameter of curve")
1056 GET (field, "E.field -> finite field containing this curve")
1057 GET (inf, "E.inf -> point at infinity of this curve")
1058 #undef GETSETNAME
1059 { 0 }
1060 };
1061
1062 static const PyMethodDef eccurve_pymethods[] = {
1063 #define METHNAME(name) ecmeth_##name
1064 METH (mmul, "E.mmul([(P0, N0), (P1, N1), ...]) = N0 P0 + N1 P1 + ...")
1065 METH (find, "E.find(X) -> P")
1066 KWMETH(rand, "E.rand([rng = rand]) -> P")
1067 SMTH (parse, "parse(STR) -> (E, REST)")
1068 #undef METHNAME
1069 { 0 }
1070 };
1071
1072 static const PyTypeObject eccurve_pytype_skel = {
1073 PyVarObject_HEAD_INIT(0, 0) /* Header */
1074 "ECCurve", /* @tp_name@ */
1075 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1076 0, /* @tp_itemsize@ */
1077
1078 eccurve_pydealloc, /* @tp_dealloc@ */
1079 0, /* @tp_print@ */
1080 0, /* @tp_getattr@ */
1081 0, /* @tp_setattr@ */
1082 0, /* @tp_compare@ */
1083 0, /* @tp_repr@ */
1084 0, /* @tp_as_number@ */
1085 0, /* @tp_as_sequence@ */
1086 0, /* @tp_as_mapping@ */
1087 0, /* @tp_hash@ */
1088 0, /* @tp_call@ */
1089 0, /* @tp_str@ */
1090 0, /* @tp_getattro@ */
1091 0, /* @tp_setattro@ */
1092 0, /* @tp_as_buffer@ */
1093 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1094 Py_TPFLAGS_BASETYPE,
1095
1096 /* @tp_doc@ */
1097 "An elliptic curve. Abstract class.",
1098
1099 0, /* @tp_traverse@ */
1100 0, /* @tp_clear@ */
1101 eccurve_pyrichcompare, /* @tp_richcompare@ */
1102 0, /* @tp_weaklistoffset@ */
1103 0, /* @tp_iter@ */
1104 0, /* @tp_iternext@ */
1105 PYMETHODS(eccurve), /* @tp_methods@ */
1106 0, /* @tp_members@ */
1107 PYGETSET(eccurve), /* @tp_getset@ */
1108 0, /* @tp_base@ */
1109 0, /* @tp_dict@ */
1110 0, /* @tp_descr_get@ */
1111 0, /* @tp_descr_set@ */
1112 0, /* @tp_dictoffset@ */
1113 0, /* @tp_init@ */
1114 PyType_GenericAlloc, /* @tp_alloc@ */
1115 abstract_pynew, /* @tp_new@ */
1116 0, /* @tp_free@ */
1117 0 /* @tp_is_gc@ */
1118 };
1119
1120 static PyObject *ecprimecurve_pynew(PyTypeObject *ty,
1121 PyObject *arg, PyObject *kw)
1122 {
1123 return (eccurve_pynew(ty, ec_prime, arg, kw));
1124 }
1125
1126 static const PyTypeObject ecprimecurve_pytype_skel = {
1127 PyVarObject_HEAD_INIT(0, 0) /* Header */
1128 "ECPrimeCurve", /* @tp_name@ */
1129 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1130 0, /* @tp_itemsize@ */
1131
1132 eccurve_pydealloc, /* @tp_dealloc@ */
1133 0, /* @tp_print@ */
1134 0, /* @tp_getattr@ */
1135 0, /* @tp_setattr@ */
1136 0, /* @tp_compare@ */
1137 0, /* @tp_repr@ */
1138 0, /* @tp_as_number@ */
1139 0, /* @tp_as_sequence@ */
1140 0, /* @tp_as_mapping@ */
1141 0, /* @tp_hash@ */
1142 0, /* @tp_call@ */
1143 0, /* @tp_str@ */
1144 0, /* @tp_getattro@ */
1145 0, /* @tp_setattro@ */
1146 0, /* @tp_as_buffer@ */
1147 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1148 Py_TPFLAGS_BASETYPE,
1149
1150 /* @tp_doc@ */
1151 "ECPrimeCurve(FIELD, A, B): an elliptic curve over a prime field.\n"
1152 " Use ECPrimeProjCurve instead.",
1153
1154 0, /* @tp_traverse@ */
1155 0, /* @tp_clear@ */
1156 eccurve_pyrichcompare, /* @tp_richcompare@ */
1157 0, /* @tp_weaklistoffset@ */
1158 0, /* @tp_iter@ */
1159 0, /* @tp_iternext@ */
1160 0, /* @tp_methods@ */
1161 0, /* @tp_members@ */
1162 0, /* @tp_getset@ */
1163 0, /* @tp_base@ */
1164 0, /* @tp_dict@ */
1165 0, /* @tp_descr_get@ */
1166 0, /* @tp_descr_set@ */
1167 0, /* @tp_dictoffset@ */
1168 0, /* @tp_init@ */
1169 PyType_GenericAlloc, /* @tp_alloc@ */
1170 ecprimecurve_pynew, /* @tp_new@ */
1171 0, /* @tp_free@ */
1172 0 /* @tp_is_gc@ */
1173 };
1174
1175 static PyObject *ecprimeprojcurve_pynew(PyTypeObject *ty,
1176 PyObject *arg, PyObject *kw)
1177 {
1178 return (eccurve_pynew(ty, ec_primeproj, arg, kw));
1179 }
1180
1181 static const PyTypeObject ecprimeprojcurve_pytype_skel = {
1182 PyVarObject_HEAD_INIT(0, 0) /* Header */
1183 "ECPrimeProjCurve", /* @tp_name@ */
1184 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1185 0, /* @tp_itemsize@ */
1186
1187 eccurve_pydealloc, /* @tp_dealloc@ */
1188 0, /* @tp_print@ */
1189 0, /* @tp_getattr@ */
1190 0, /* @tp_setattr@ */
1191 0, /* @tp_compare@ */
1192 0, /* @tp_repr@ */
1193 0, /* @tp_as_number@ */
1194 0, /* @tp_as_sequence@ */
1195 0, /* @tp_as_mapping@ */
1196 0, /* @tp_hash@ */
1197 0, /* @tp_call@ */
1198 0, /* @tp_str@ */
1199 0, /* @tp_getattro@ */
1200 0, /* @tp_setattro@ */
1201 0, /* @tp_as_buffer@ */
1202 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1203 Py_TPFLAGS_BASETYPE,
1204
1205 /* @tp_doc@ */
1206 "ECPrimeProjCurve(FIELD, A, B): an elliptic curve over a prime field\n"
1207 " using projective coordinates.",
1208
1209 0, /* @tp_traverse@ */
1210 0, /* @tp_clear@ */
1211 eccurve_pyrichcompare, /* @tp_richcompare@ */
1212 0, /* @tp_weaklistoffset@ */
1213 0, /* @tp_iter@ */
1214 0, /* @tp_iternext@ */
1215 0, /* @tp_methods@ */
1216 0, /* @tp_members@ */
1217 0, /* @tp_getset@ */
1218 0, /* @tp_base@ */
1219 0, /* @tp_dict@ */
1220 0, /* @tp_descr_get@ */
1221 0, /* @tp_descr_set@ */
1222 0, /* @tp_dictoffset@ */
1223 0, /* @tp_init@ */
1224 PyType_GenericAlloc, /* @tp_alloc@ */
1225 ecprimeprojcurve_pynew, /* @tp_new@ */
1226 0, /* @tp_free@ */
1227 0 /* @tp_is_gc@ */
1228 };
1229
1230 static PyObject *ecbincurve_pynew(PyTypeObject *ty,
1231 PyObject *arg, PyObject *kw)
1232 {
1233 return (eccurve_pynew(ty, ec_bin, arg, kw));
1234 }
1235
1236 static const PyTypeObject ecbincurve_pytype_skel = {
1237 PyVarObject_HEAD_INIT(0, 0) /* Header */
1238 "ECBinCurve", /* @tp_name@ */
1239 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1240 0, /* @tp_itemsize@ */
1241
1242 eccurve_pydealloc, /* @tp_dealloc@ */
1243 0, /* @tp_print@ */
1244 0, /* @tp_getattr@ */
1245 0, /* @tp_setattr@ */
1246 0, /* @tp_compare@ */
1247 0, /* @tp_repr@ */
1248 0, /* @tp_as_number@ */
1249 0, /* @tp_as_sequence@ */
1250 0, /* @tp_as_mapping@ */
1251 0, /* @tp_hash@ */
1252 0, /* @tp_call@ */
1253 0, /* @tp_str@ */
1254 0, /* @tp_getattro@ */
1255 0, /* @tp_setattro@ */
1256 0, /* @tp_as_buffer@ */
1257 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1258 Py_TPFLAGS_BASETYPE,
1259
1260 /* @tp_doc@ */
1261 "ECBinCurve(FIELD, A, B): an elliptic curve over a binary field.\n"
1262 " Use ECBinProjCurve instead.",
1263
1264 0, /* @tp_traverse@ */
1265 0, /* @tp_clear@ */
1266 eccurve_pyrichcompare, /* @tp_richcompare@ */
1267 0, /* @tp_weaklistoffset@ */
1268 0, /* @tp_iter@ */
1269 0, /* @tp_iternext@ */
1270 0, /* @tp_methods@ */
1271 0, /* @tp_members@ */
1272 0, /* @tp_getset@ */
1273 0, /* @tp_base@ */
1274 0, /* @tp_dict@ */
1275 0, /* @tp_descr_get@ */
1276 0, /* @tp_descr_set@ */
1277 0, /* @tp_dictoffset@ */
1278 0, /* @tp_init@ */
1279 PyType_GenericAlloc, /* @tp_alloc@ */
1280 ecbincurve_pynew, /* @tp_new@ */
1281 0, /* @tp_free@ */
1282 0 /* @tp_is_gc@ */
1283 };
1284
1285 static PyObject *ecbinprojcurve_pynew(PyTypeObject *ty,
1286 PyObject *arg, PyObject *kw)
1287 {
1288 return (eccurve_pynew(ty, ec_binproj, arg, kw));
1289 }
1290
1291 static const PyTypeObject ecbinprojcurve_pytype_skel = {
1292 PyVarObject_HEAD_INIT(0, 0) /* Header */
1293 "ECBinProjCurve", /* @tp_name@ */
1294 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1295 0, /* @tp_itemsize@ */
1296
1297 eccurve_pydealloc, /* @tp_dealloc@ */
1298 0, /* @tp_print@ */
1299 0, /* @tp_getattr@ */
1300 0, /* @tp_setattr@ */
1301 0, /* @tp_compare@ */
1302 0, /* @tp_repr@ */
1303 0, /* @tp_as_number@ */
1304 0, /* @tp_as_sequence@ */
1305 0, /* @tp_as_mapping@ */
1306 0, /* @tp_hash@ */
1307 0, /* @tp_call@ */
1308 0, /* @tp_str@ */
1309 0, /* @tp_getattro@ */
1310 0, /* @tp_setattro@ */
1311 0, /* @tp_as_buffer@ */
1312 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1313 Py_TPFLAGS_BASETYPE,
1314
1315 /* @tp_doc@ */
1316 "ECBinProjCurve(FIELD, A, B): an elliptic curve over a binary field,\n"
1317 " using projective coordinates.",
1318
1319 0, /* @tp_traverse@ */
1320 0, /* @tp_clear@ */
1321 eccurve_pyrichcompare, /* @tp_richcompare@ */
1322 0, /* @tp_weaklistoffset@ */
1323 0, /* @tp_iter@ */
1324 0, /* @tp_iternext@ */
1325 0, /* @tp_methods@ */
1326 0, /* @tp_members@ */
1327 0, /* @tp_getset@ */
1328 0, /* @tp_base@ */
1329 0, /* @tp_dict@ */
1330 0, /* @tp_descr_get@ */
1331 0, /* @tp_descr_set@ */
1332 0, /* @tp_dictoffset@ */
1333 0, /* @tp_init@ */
1334 PyType_GenericAlloc, /* @tp_alloc@ */
1335 ecbinprojcurve_pynew, /* @tp_new@ */
1336 0, /* @tp_free@ */
1337 0 /* @tp_is_gc@ */
1338 };
1339
1340 /*----- Curve info --------------------------------------------------------*/
1341
1342 void ecinfo_copy(ec_info *eic, const ec_info *ei)
1343 {
1344 eic->c = eccurve_copy(ei->c);
1345 EC_CREATE(&eic->g);
1346 EC_COPY(&eic->g, &ei->g);
1347 eic->r = MP_COPY(ei->r);
1348 eic->h = MP_COPY(ei->h);
1349 }
1350
1351 PyObject *ecinfo_pywrap(ec_info *ei)
1352 {
1353 ecinfo_pyobj *o;
1354
1355 o = PyObject_NEW(ecinfo_pyobj, ecinfo_pytype);
1356 o->ei = *ei;
1357 o->cobj = eccurve_pywrap(0, o->ei.c);
1358 Py_INCREF(o->cobj);
1359 return ((PyObject *)o);
1360 }
1361
1362 static void ecinfo_pydealloc(PyObject *me)
1363 {
1364 ec_info *ei = ECINFO_EI(me);
1365 EC_DESTROY(&ei->g);
1366 MP_DROP(ei->r);
1367 MP_DROP(ei->h);
1368 Py_DECREF(ECINFO_COBJ(me));
1369 FREEOBJ(me);
1370 }
1371
1372 static PyObject *ecinfo_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
1373 {
1374 ec_info ei = { 0 };
1375 PyObject *e, *g;
1376 static const char *const kwlist[] = { "curve", "G", "r", "h", 0 };
1377 ecinfo_pyobj *rc = 0;
1378
1379 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O!O&O&:new", KWLIST,
1380 eccurve_pytype, &e, ecpt_pytype, &g,
1381 convmp, &ei.r, convmp, &ei.h))
1382 goto end;
1383 if (ECPT_C(g) != ECCURVE_C(e) && !ec_samep(ECPT_C(g), ECCURVE_C(e)))
1384 TYERR("point not from this curve");
1385 ei.c = ECCURVE_C(e);
1386 EC_CREATE(&ei.g);
1387 EC_OUT(ei.c, &ei.g, ECPT_P(g));
1388 rc = (ecinfo_pyobj *)ty->tp_alloc(ty, 0);
1389 rc->ei = ei;
1390 rc->cobj = e;
1391 Py_INCREF(rc->cobj);
1392 return ((PyObject *)rc);
1393
1394 end:
1395 mp_drop(ei.r);
1396 mp_drop(ei.h);
1397 return (0);
1398 }
1399
1400 static PyObject *eimeth_parse(PyObject *me, PyObject *arg)
1401 {
1402 char *p;
1403 qd_parse qd;
1404 ec_info ei;
1405 PyObject *rc = 0;
1406
1407 if (!PyArg_ParseTuple(arg, "s:parse", &p)) goto end;
1408 qd.p = p; qd.e = 0;
1409 if (ec_infoparse(&qd, &ei)) VALERR(qd.e);
1410 rc = Py_BuildValue("(Ns)", ecinfo_pywrap(&ei), qd.p);
1411 end:
1412 return (rc);
1413 }
1414
1415 static PyObject *ecinfo_pyrichcompare(PyObject *x, PyObject *y, int op)
1416 {
1417 int b = ec_sameinfop(ECINFO_EI(x), ECINFO_EI(y));
1418 switch (op) {
1419 case Py_EQ: break;
1420 case Py_NE: b = !b;
1421 default: TYERR("can't order elliptic curve infos");
1422 }
1423 return (getbool(b));
1424 end:
1425 return (0);
1426 }
1427
1428 static PyObject *eimeth_check(PyObject *me, PyObject *arg, PyObject *kw)
1429 {
1430 static const char *const kwlist[] = { "rng", 0 };
1431 grand *r = &rand_global;
1432 const char *p;
1433
1434 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:check", KWLIST,
1435 convgrand, &r))
1436 goto end;
1437 if ((p = ec_checkinfo(ECINFO_EI(me), r)) != 0)
1438 VALERR(p);
1439 RETURN_ME;
1440 end:
1441 return (0);
1442 }
1443
1444 static PyObject *eiget_curve(PyObject *me, void *hunoz)
1445 { RETURN_OBJ(ECINFO_COBJ(me)); }
1446
1447 static PyObject *eiget_G(PyObject *me, void *hunoz)
1448 {
1449 ec_info *ei = ECINFO_EI(me);
1450 ec p = EC_INIT;
1451 EC_IN(ei->c, &p, &ei->g);
1452 return (ecpt_pywrap(ECINFO_COBJ(me), &p));
1453 }
1454
1455 static PyObject *eiget_r(PyObject *me, void *hunoz)
1456 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->r))); }
1457
1458 static PyObject *eiget_h(PyObject *me, void *hunoz)
1459 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->h))); }
1460
1461 static const PyGetSetDef ecinfo_pygetset[] = {
1462 #define GETSETNAME(op, name) ei##op##_##name
1463 GET (curve, "I.curve -> the elliptic curve")
1464 GET (G, "I.G -> generator point for the group")
1465 GET (r, "I.r -> order of the group (and hence of G")
1466 GET (h, "I.h -> cofactor of the group")
1467 #undef GETSETNAME
1468 { 0 }
1469 };
1470
1471 static const PyMethodDef ecinfo_pymethods[] = {
1472 #define METHNAME(name) eimeth_##name
1473 KWMETH(check, "I.check([rng = rand]) -> None")
1474 SMTH (parse, "parse(STR) -> (I, REST)")
1475 #undef METHNAME
1476 { 0 }
1477 };
1478
1479 static const PyTypeObject ecinfo_pytype_skel = {
1480 PyVarObject_HEAD_INIT(0, 0) /* Header */
1481 "ECInfo", /* @tp_name@ */
1482 sizeof(ecinfo_pyobj), /* @tp_basicsize@ */
1483 0, /* @tp_itemsize@ */
1484
1485 ecinfo_pydealloc, /* @tp_dealloc@ */
1486 0, /* @tp_print@ */
1487 0, /* @tp_getattr@ */
1488 0, /* @tp_setattr@ */
1489 0, /* @tp_compare@ */
1490 0, /* @tp_repr@ */
1491 0, /* @tp_as_number@ */
1492 0, /* @tp_as_sequence@ */
1493 0, /* @tp_as_mapping@ */
1494 0, /* @tp_hash@ */
1495 0, /* @tp_call@ */
1496 0, /* @tp_str@ */
1497 0, /* @tp_getattro@ */
1498 0, /* @tp_setattro@ */
1499 0, /* @tp_as_buffer@ */
1500 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1501 Py_TPFLAGS_BASETYPE,
1502
1503 /* @tp_doc@ */
1504 "ECInfo(CURVE, G, R, H): elliptic curve domain parameters.",
1505
1506 0, /* @tp_traverse@ */
1507 0, /* @tp_clear@ */
1508 ecinfo_pyrichcompare, /* @tp_richcompare@ */
1509 0, /* @tp_weaklistoffset@ */
1510 0, /* @tp_iter@ */
1511 0, /* @tp_iternext@ */
1512 PYMETHODS(ecinfo), /* @tp_methods@ */
1513 0, /* @tp_members@ */
1514 PYGETSET(ecinfo), /* @tp_getset@ */
1515 0, /* @tp_base@ */
1516 0, /* @tp_dict@ */
1517 0, /* @tp_descr_get@ */
1518 0, /* @tp_descr_set@ */
1519 0, /* @tp_dictoffset@ */
1520 0, /* @tp_init@ */
1521 PyType_GenericAlloc, /* @tp_alloc@ */
1522 ecinfo_pynew, /* @tp_new@ */
1523 0, /* @tp_free@ */
1524 0 /* @tp_is_gc@ */
1525 };
1526
1527 /*----- Setup -------------------------------------------------------------*/
1528
1529 static const struct nameval consts[] = {
1530 CONST(EC_XONLY), CONST(EC_YBIT), CONST(EC_LSB),
1531 CONST(EC_CMPR), CONST(EC_EXPLY), CONST(EC_SORT),
1532 { 0 }
1533 };
1534
1535 void ec_pyinit(void)
1536 {
1537 INITTYPE(ecpt, root);
1538 INITTYPE(ecptcurve, ecpt);
1539 INITTYPE(eccurve, type);
1540 INITTYPE(ecprimecurve, eccurve);
1541 INITTYPE(ecprimeprojcurve, ecprimecurve);
1542 INITTYPE(ecbincurve, eccurve);
1543 INITTYPE(ecbinprojcurve, ecbincurve);
1544 INITTYPE(ecinfo, root);
1545 }
1546
1547 static const char *ec_namefn(const void *p)
1548 { const ecentry *ec = p; return (ec->name); }
1549
1550 static int ec_ixfn(const void *p)
1551 {
1552 const ecentry *ec = p;
1553 int i;
1554
1555 for (i = 0; ectab[i].name; i++)
1556 if (ectab[i].data == ec->data) return (i);
1557 return (-1);
1558 }
1559
1560 static PyObject *ec_valfn(int i)
1561 {
1562 ec_info ei;
1563
1564 ec_infofromdata(&ei, ectab[i].data);
1565 return (ecinfo_pywrap(&ei));
1566 }
1567
1568 void ec_pyinsert(PyObject *mod)
1569 {
1570 INSERT("ECPt", ecpt_pytype);
1571 INSERT("ECPtCurve", ecptcurve_pytype);
1572 INSERT("ECCurve", eccurve_pytype);
1573 INSERT("ECPrimeCurve", ecprimecurve_pytype);
1574 INSERT("ECPrimeProjCurve", ecprimeprojcurve_pytype);
1575 INSERT("ECBinCurve", ecbincurve_pytype);
1576 INSERT("ECBinProjCurve", ecbinprojcurve_pytype);
1577 INSERT("ECInfo", ecinfo_pytype);
1578 INSERT("eccurves", make_grouptab(ectab, sizeof(*ectab),
1579 ec_namefn, ec_ixfn, ec_valfn));
1580 setconstants(mod, consts);
1581 }
1582
1583 /*----- That's all, folks -------------------------------------------------*/
Catacomb cryptographic library -- Python bindings