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[catacomb-python] / ec.c
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d7ab1bab 1/* -*-c-*-
d7ab1bab 2 *
3 * Elliptic curves
4 *
5 * (c) 2004 Straylight/Edgeware
6 */
7
b2687a0a 8/*----- Licensing notice --------------------------------------------------*
d7ab1bab 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.
b2687a0a 16 *
d7ab1bab 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.
b2687a0a 21 *
d7ab1bab 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
33PyTypeObject *ecpt_pytype;
34PyTypeObject *ecptcurve_pytype;
35PyTypeObject *eccurve_pytype;
36PyTypeObject *ecprimecurve_pytype;
37PyTypeObject *ecprimeprojcurve_pytype;
38PyTypeObject *ecbincurve_pytype;
39PyTypeObject *ecbinprojcurve_pytype;
40PyTypeObject *ecinfo_pytype;
41
42ec_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") == 0)
52 c = ec_prime(f, a, b);
53 else if (strcmp(EC_NAME(c), "primeproj") == 0)
54 c = ec_primeproj(f, a, b);
55 else if (strcmp(EC_NAME(c), "bin") == 0)
56 c = ec_bin(f, a, b);
57 else if (strcmp(EC_NAME(c), "binproj") == 0)
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
67static 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
76PyObject *ecpt_pywrap(PyObject *cobj, ec *p)
77 { return (ecpt_dopywrap(cobj, ECCURVE_C(cobj), p)); }
78
79PyObject *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
92int 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
105int 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
115void 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
125int convecpt(PyObject *o, void *p)
126{
127 if (!ECPT_PYCHECK(o))
128 TYERR("want elliptic curve point");
129 getecptout(p, o);
130 return (1);
131end:
132 return (0);
133}
134
135/*----- Curve points ------------------------------------------------------*/
136
137static 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 }
158BINOP(add)
159BINOP(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 }
169UNOP(neg)
170#undef UNOP
171
172static PyObject *ecpt_pyid(PyObject *x) { RETURN_OBJ(x); }
173
174static int ecpt_pynonzerop(PyObject *x) { return (!EC_ATINF(ECPT_P(x))); }
175
176static void ecpt_pydealloc(PyObject *x)
177{
178 EC_DESTROY(ECPT_P(x));
179 Py_DECREF(ECPT_COBJ(x));
3aa33042 180 FREEOBJ(x);
d7ab1bab 181}
182
183static 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 return (ecpt_pywrap(ECPT_COBJ(y), &zz));
192}
193
194static long ecpt_pyhash(PyObject *me)
195{
6d481bc6
MW		 196 uint32 h;
197 buf b;
d7ab1bab 198 ec p = EC_INIT;
6d481bc6
MW		 199 size_t sz = 2*ECPT_C(me)->f->noctets + 1;
200 octet *q = xmalloc(sz);
d7ab1bab 201
6d481bc6
MW		 202 h = 0xe0fdd039 + ECPT_C(me)->f->ops->ty;
203 buf_init(&b, q, sz);
d7ab1bab 204 EC_OUT(ECPT_C(me), &p, ECPT_P(me));
6d481bc6 205 ec_putraw(ECPT_C(me), &b, &p);
d7ab1bab 206 EC_DESTROY(&p);
6d481bc6 207 h = unihash_hash(&unihash_global, h, BBASE(&b), BLEN(&b));
9acb0b54 208 xfree(q);
6d481bc6 209 return (h % LONG_MAX);
d7ab1bab 210}
211
212static PyObject *ecpt_pyrichcompare(PyObject *x, PyObject *y, int op)
213{
214 ec_curve *c;
215 PyObject *cobj;
216 ec p = EC_INIT, q = EC_INIT;
217 int b;
218 PyObject *rc = 0;
219
220 if (ecbinop(x, y, &c, &cobj, &p, &q)) RETURN_NOTIMPL;
221 EC_OUT(c, &p, &p);
222 EC_OUT(c, &q, &q);
223 switch (op) {
224 case Py_EQ: b = EC_EQ(&p, &q); break;
225 case Py_NE: b = !EC_EQ(&p, &q); break;
226 default: TYERR("elliptic curve points are unordered");
227 }
228 rc = getbool(b);
229end:
230 EC_DESTROY(&p);
231 EC_DESTROY(&q);
232 return (rc);
233}
234
235static PyObject *epmeth_oncurvep(PyObject *me, PyObject *arg)
236{
237 if (!PyArg_ParseTuple(arg, ":oncurvep")) return (0);
49915b4a
MW		 238 return (getbool(EC_ATINF(ECPT_P(me)) ||
239 !EC_CHECK(ECPT_C(me), ECPT_P(me))));
d7ab1bab 240}
241
242static PyObject *epmeth_dbl(PyObject *me, PyObject *arg)
243{
244 ec p = EC_INIT;
245 if (!PyArg_ParseTuple(arg, ":dbl")) return (0);
246 EC_DBL(ECPT_C(me), &p, ECPT_P(me));
247 return (ecpt_pywrap(ECPT_COBJ(me), &p));
248}
249
250static PyObject *epmeth_tobuf(PyObject *me, PyObject *arg)
251{
252 buf b;
253 ec p = EC_INIT;
254 PyObject *rc;
255 size_t n;
256
257 if (!PyArg_ParseTuple(arg, ":tobuf")) return (0);
258 getecptout(&p, me);
259 if (EC_ATINF(&p))
260 n = 2;
261 else
262 n = mp_octets(p.x) + mp_octets(p.y) + 4;
263 rc = bytestring_pywrap(0, n);
264 buf_init(&b, PyString_AS_STRING(rc), n);
265 buf_putec(&b, &p);
266 assert(BOK(&b));
267 _PyString_Resize(&rc, BLEN(&b));
268 EC_DESTROY(&p);
269 return (rc);
270}
271
272static PyObject *epmeth_toraw(PyObject *me, PyObject *arg)
273{
274 buf b;
275 PyObject *rc;
276 char *p;
277 ec_curve *c = ECPT_C(me);
278 ec pp = EC_INIT;
279 int len;
280
281 if (!PyArg_ParseTuple(arg, ":toraw")) return (0);
282 len = c->f->noctets * 2 + 1;
283 rc = bytestring_pywrap(0, len);
284 p = PyString_AS_STRING(rc);
285 buf_init(&b, p, len);
286 EC_OUT(c, &pp, ECPT_P(me));
287 ec_putraw(c, &b, &pp);
288 EC_DESTROY(&pp);
289 _PyString_Resize(&rc, BLEN(&b));
290 return (rc);
291}
292
e12df5f3
MW		 293static PyObject *epmeth_ec2osp(PyObject *me, PyObject *arg, PyObject *kw)
294{
295 buf b;
296 PyObject *rc;
297 char *p;
298 ec_curve *c = ECPT_C(me);
299 ec pp = EC_INIT;
300 int f = EC_EXPLY;
301 int len;
302 char *kwlist[] = { "flags", 0 };
303
304 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|i:ectosp", kwlist, &f))
305 return (0);
306 len = c->f->noctets * 2 + 1;
307 rc = bytestring_pywrap(0, len);
308 p = PyString_AS_STRING(rc);
309 buf_init(&b, p, len);
310 EC_OUT(c, &pp, ECPT_P(me));
311 if (ec_ec2osp(c, f, &b, &pp)) {
312 Py_DECREF(rc); rc = 0;
313 VALERR("invalid flags");
314 }
315 EC_DESTROY(&pp);
316 _PyString_Resize(&rc, BLEN(&b));
317end:
318 return (rc);
319}
320
d7ab1bab 321static PyObject *epget_curve(PyObject *me, void *hunoz)
322 { RETURN_OBJ(ECPT_COBJ(me)); }
323
324static PyObject *epncget_ix(PyObject *me, void *hunoz)
325{
326 ec p = EC_INIT;
327 PyObject *rc;
328 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
329 getecptout(&p, me);
330 rc = mp_pywrap(MP_COPY(p.x));
331 EC_DESTROY(&p);
332 return (rc);
333}
334
335static PyObject *epncget_iy(PyObject *me, void *hunoz)
336{
337 ec p = EC_INIT;
338 PyObject *rc;
339 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
340 getecptout(&p, me);
341 rc = mp_pywrap(MP_COPY(p.y));
342 EC_DESTROY(&p);
343 return (rc);
344}
345
346static PyObject *epncget_point(PyObject *me, void *hunoz)
347 { RETURN_ME; }
348
349static PyObject *epget_point(PyObject *me, void *hunoz)
350{
351 ec p = EC_INIT;
352 getecptout(&p, me);
353 return (ecpt_pywrapout(ecpt_pytype, &p));
354}
355
356static PyObject *epget_x(PyObject *me, void *hunoz)
357{
358 ec_curve *c = ECPT_C(me);
359 ec *pp = ECPT_P(me);
360 PyObject *fobj = ECPT_FOBJ(me);
361 ec p = EC_INIT;
362 PyObject *rc;
363
364 if (EC_ATINF(pp)) RETURN_NONE;
365 EC_OUT(c, &p, pp);
366 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.x));
367 EC_DESTROY(&p);
368 return (rc);
369}
370
371static PyObject *epget_y(PyObject *me, void *hunoz)
372{
373 ec_curve *c = ECPT_C(me);
374 ec *pp = ECPT_P(me);
375 PyObject *fobj = ECPT_FOBJ(me);
376 ec p = EC_INIT;
377 PyObject *rc;
378
379 if (EC_ATINF(pp)) RETURN_NONE;
380 EC_OUT(c, &p, pp);
381 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.y));
382 EC_DESTROY(&p);
383 return (rc);
384}
385
386static PyObject *epget__x(PyObject *me, void *hunoz)
387{
388 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
389 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->x)));
390}
391
392static PyObject *epget__y(PyObject *me, void *hunoz)
393{
394 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
395 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->y)));
396}
397
398static PyObject *epget__z(PyObject *me, void *hunoz)
399{
400 if (EC_ATINF(ECPT_P(me)) || !ECPT_P(me)->z) RETURN_NONE;
401 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->z)));
402}
403
404static mp *coord_in(field *f, PyObject *x)
405{
406 mp *xx;
407 if (FE_PYCHECK(x) && FE_F(x) == f)
408 return (MP_COPY(FE_X(x)));
409 else if ((xx = getmp(x)) == 0)
410 return (0);
411 else
412 return (F_IN(f, xx, xx));
413}
414
415static int ecptxl_3(ec_curve *c, ec *p,
416 PyObject *x, PyObject *y, PyObject *z)
417{
418 int rc = -1;
419
420 if (!x || !y || !z) TYERR("missing argument");
421 if (!c) VALERR("internal form with no curve!");
422 if ((p->x == coord_in(c->f, x)) == 0 ||
423 (p->y == coord_in(c->f, y)) == 0 ||
424 (z != Py_None && (p->z = coord_in(c->f, z))) == 0)
425 goto end;
426 if (!p->z) p->z = MP_COPY(c->f->one); /* just in case */
427 rc = 0;
428end:
429 return (rc);
430}
431
432static int ecptxl_2(ec_curve *c, ec *p, PyObject *x, PyObject *y)
433{
434 int rc = -1;
435
436 if (!x || !y) TYERR("missing argument");
437 if ((p->x = getmp(x)) == 0 ||
438 (p->y = getmp(y)) == 0)
439 goto end;
440 if (c) EC_IN(c, p, p);
441 rc = 0;
442end:
443 return (rc);
444}
445
446static int ecptxl_1(ec_curve *c, ec *p, PyObject *x)
447{
448 int rc = -1;
449 PyObject *y = 0, *z = 0, *t = 0;
450 mp *xx = 0;
451 const void *q;
452 int n;
453 qd_parse qd;
454
455 Py_XINCREF(x);
456 if (!x || x == Py_None)
457 /*cool*/;
458 else if (ECPT_PYCHECK(x)) {
459 getecptout(p, x);
460 goto fix;
461 } else if (PyString_Check(x)) {
462 if (PyObject_AsReadBuffer(x, &q, 0))
463 goto end;
464 qd.p = q;
465 qd.e = 0;
466 if (!ec_ptparse(&qd, p))
80f7cd89 467 VALERR(qd.e);
d7ab1bab 468 goto fix;
469 } else if (c && (xx = tomp(x)) != 0) {
470 xx = F_IN(c->f, xx, xx);
471 if (!EC_FIND(c, p, xx)) VALERR("not on the curve");
472 } else if (PySequence_Check(x)) {
473 t = x; x = 0;
474 n = PySequence_Size(t);
475 if (n != 2 && (n != 3 || !c))
476 TYERR("want sequence of two or three items");
477 if ((x = PySequence_GetItem(t, 0)) == 0 ||
478 (y = PySequence_GetItem(t, 1)) == 0 ||
479 (n == 3 && (z = PySequence_GetItem(t, 2)) == 0))
480 goto end;
481 rc = (n == 2) ? ecptxl_2(c, p, x, y) : ecptxl_3(c, p, x, y, z);
482 } else
483 TYERR("can't convert to curve point");
484 goto ok;
485
486fix:
487 if (c) EC_IN(c, p, p);
488ok:
489 rc = 0;
490end:
491 Py_XDECREF(x); Py_XDECREF(y); Py_XDECREF(z); Py_XDECREF(t);
492 mp_drop(xx);
493 return (rc);
494}
495
496static int ecptxl(ec_curve *c, ec *p, PyObject *x, PyObject *y, PyObject *z)
497{
498 if (z)
499 return (ecptxl_3(c, p, x, y, z));
500 else if (y)
501 return (ecptxl_2(c, p, x, y));
502 else
503 return (ecptxl_1(c, p, x));
504}
505
d7ab1bab 506static PyObject *ecptnc_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
507{
508 PyObject *x = 0, *y = 0, *z = 0;
509 ec p = EC_INIT;
510 char *kwlist[] = { "x", "y", 0 };
511
512 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OO:new", kwlist, &x, &y) ||
513 ecptxl(0, &p, x, y, z))
514 goto end;
515 return (ecpt_pywrapout(ty, &p));
516end:
517 EC_DESTROY(&p);
518 return (0);
519}
520
521static PyObject *ecpt_pyint(PyObject *me)
522{
523 ec p = EC_INIT;
524 long l;
525 PyObject *rc = 0;
526 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
527 getecptout(&p, me);
bc243788
MW		 528 if (!mp_tolong_checked(p.x, &l, 0)) rc = PyInt_FromLong(l);
529 else rc = mp_topylong(p.x);
d7ab1bab 530end:
531 EC_DESTROY(&p);
532 return (rc);
533}
534
535static PyObject *ecpt_pylong(PyObject *me)
536{
537 ec p = EC_INIT;
538 PyObject *rc = 0;
539 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
540 getecptout(&p, me);
f368b46e 541 rc = mp_topylong(p.x);
d7ab1bab 542end:
543 EC_DESTROY(&p);
544 return (rc);
545}
546
547static PyObject *ecpt_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
548{
549 PyObject *x = 0, *y = 0, *z = 0;
550 ec p = EC_INIT;
551 char *kwlist[] = { "x", "y", "z", 0 };
552
553 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OOO:new", kwlist,
554 &x, &y, &z) ||
555 ecptxl(ECCURVE_C(ty), &p, x, y, z))
556 goto end;
557 return (ecpt_pywrap((PyObject *)ty, &p));
558end:
559 EC_DESTROY(&p);
560 return (0);
561}
562
563static PyGetSetDef ecptnc_pygetset[] = {
564#define GETSETNAME(op, name) epnc##op##_##name
565 GET (ix, "P.ix -> integer x coordinate of P")
566 GET (iy, "P.iy -> integer y coordinate of P")
567 GET (point, "P.point -> standalone curve point (no-op)")
568#undef GETSETNAME
569 { 0 }
570};
571
572static PyMethodDef ecptnc_pymethods[] = {
573#define METHNAME(func) epmeth_##func
574 METH (tobuf, "X.tobuf() -> BIN")
575#undef METHNAME
576 { 0 }
577};
578
579static PyNumberMethods ecpt_pynumber = {
580 0, /* @nb_add@ */
581 0, /* @nb_subtract@ */
582 0, /* @nb_multiply@ */
583 0, /* @nb_divide@ */
584 0, /* @nb_remainder@ */
585 0, /* @nb_divmod@ */
586 0, /* @nb_power@ */
587 0, /* @nb_negative@ */
588 0, /* @nb_positive@ */
589 0, /* @nb_absolute@ */
590 ecpt_pynonzerop, /* @nb_nonzero@ */
591 0, /* @nb_invert@ */
592 0, /* @nb_lshift@ */
593 0, /* @nb_rshift@ */
594 0, /* @nb_and@ */
595 0, /* @nb_xor@ */
596 0, /* @nb_or@ */
597 0, /* @nb_coerce@ */
598 ecpt_pyint, /* @nb_int@ */
599 ecpt_pylong, /* @nb_long@ */
600 0, /* @nb_float@ */
601 0, /* @nb_oct@ */
602 0, /* @nb_hex@ */
603
604 0, /* @nb_inplace_add@ */
605 0, /* @nb_inplace_subtract@ */
606 0, /* @nb_inplace_multiply@ */
607 0, /* @nb_inplace_divide@ */
608 0, /* @nb_inplace_remainder@ */
609 0, /* @nb_inplace_power@ */
610 0, /* @nb_inplace_lshift@ */
611 0, /* @nb_inplace_rshift@ */
612 0, /* @nb_inplace_and@ */
613 0, /* @nb_inplace_xor@ */
614 0, /* @nb_inplace_or@ */
615
616 0, /* @nb_floor_divide@ */
617 0, /* @nb_true_divide@ */
618 0, /* @nb_inplace_floor_divide@ */
619 0, /* @nb_inplace_true_divide@ */
620};
621
622static PyTypeObject ecpt_pytype_skel = {
6d4db0bf 623 PyObject_HEAD_INIT(0) 0, /* Header */
c461c9b3 624 "ECPt", /* @tp_name@ */
d7ab1bab 625 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
626 0, /* @tp_itemsize@ */
627
628 ecpt_pydealloc, /* @tp_dealloc@ */
629 0, /* @tp_print@ */
630 0, /* @tp_getattr@ */
631 0, /* @tp_setattr@ */
632 0, /* @tp_compare@ */
633 0, /* @tp_repr@ */
634 &ecpt_pynumber, /* @tp_as_number@ */
635 0, /* @tp_as_sequence@ */
636 0, /* @tp_as_mapping@ */
637 ecpt_pyhash, /* @tp_hash@ */
638 0, /* @tp_call@ */
639 0, /* @tp_str@ */
640 0, /* @tp_getattro@ */
641 0, /* @tp_setattro@ */
642 0, /* @tp_as_buffer@ */
643 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
644 Py_TPFLAGS_CHECKTYPES |
645 Py_TPFLAGS_BASETYPE,
646
647 /* @tp_doc@ */
648"Elliptic curve points, not associated with any curve.",
649
650 0, /* @tp_traverse@ */
651 0, /* @tp_clear@ */
652 ecpt_pyrichcompare, /* @tp_richcompare@ */
653 0, /* @tp_weaklistoffset@ */
654 0, /* @tp_iter@ */
963a6148 655 0, /* @tp_iternext@ */
d7ab1bab 656 ecptnc_pymethods, /* @tp_methods@ */
657 0, /* @tp_members@ */
658 ecptnc_pygetset, /* @tp_getset@ */
659 0, /* @tp_base@ */
660 0, /* @tp_dict@ */
661 0, /* @tp_descr_get@ */
662 0, /* @tp_descr_set@ */
663 0, /* @tp_dictoffset@ */
664 0, /* @tp_init@ */
665 PyType_GenericAlloc, /* @tp_alloc@ */
666 ecptnc_pynew, /* @tp_new@ */
3aa33042 667 0, /* @tp_free@ */
d7ab1bab 668 0 /* @tp_is_gc@ */
669};
670
671static PyGetSetDef ecpt_pygetset[] = {
672#define GETSETNAME(op, name) ep##op##_##name
673 GET (curve, "P.curve -> elliptic curve containing P")
674 GET (point, "P.point -> standalone curve point")
675 GET (x, "P.x -> Cartesian x coordinate of P")
676 GET (y, "P.y -> Cartesian y coordinate of P")
677 GET (_x, "P._x -> internal x coordinate of P")
678 GET (_y, "P._y -> internal y coordinate of P")
679 GET (_z, "P._z -> internal z coordinate of P, or None")
680#undef GETSETNAME
681 { 0 }
682};
683
684static PyMethodDef ecpt_pymethods[] = {
685#define METHNAME(func) epmeth_##func
686 METH (toraw, "X.toraw() -> BIN")
e12df5f3 687 KWMETH(ec2osp, "X.ec2osp([flags = EC_EXPLY]) -> BIN")
d7ab1bab 688 METH (dbl, "X.dbl() -> X + X")
3aa33042 689 METH (oncurvep, "X.oncurvep() -> BOOL")
d7ab1bab 690#undef METHNAME
691 { 0 }
692};
693
694static PyNumberMethods ecptcurve_pynumber = {
695 ecpt_pyadd, /* @nb_add@ */
696 ecpt_pysub, /* @nb_subtract@ */
697 ecpt_pymul, /* @nb_multiply@ */
698 0, /* @nb_divide@ */
699 0, /* @nb_remainder@ */
700 0, /* @nb_divmod@ */
701 0, /* @nb_power@ */
702 ecpt_pyneg, /* @nb_negative@ */
703 ecpt_pyid, /* @nb_positive@ */
704 0, /* @nb_absolute@ */
705 0, /* @nb_nonzero@ */
706 0, /* @nb_invert@ */
707 0, /* @nb_lshift@ */
708 0, /* @nb_rshift@ */
709 0, /* @nb_and@ */
710 0, /* @nb_xor@ */
711 0, /* @nb_or@ */
712 0, /* @nb_coerce@ */
713 0, /* @nb_int@ */
714 0, /* @nb_long@ */
715 0, /* @nb_float@ */
716 0, /* @nb_oct@ */
717 0, /* @nb_hex@ */
718
719 0, /* @nb_inplace_add@ */
720 0, /* @nb_inplace_subtract@ */
721 0, /* @nb_inplace_multiply@ */
722 0, /* @nb_inplace_divide@ */
723 0, /* @nb_inplace_remainder@ */
724 0, /* @nb_inplace_power@ */
725 0, /* @nb_inplace_lshift@ */
726 0, /* @nb_inplace_rshift@ */
727 0, /* @nb_inplace_and@ */
728 0, /* @nb_inplace_xor@ */
729 0, /* @nb_inplace_or@ */
730
731 0, /* @nb_floor_divide@ */
732 0, /* @nb_true_divide@ */
733 0, /* @nb_inplace_floor_divide@ */
734 0, /* @nb_inplace_true_divide@ */
735};
736
737static PyTypeObject ecptcurve_pytype_skel = {
6d4db0bf 738 PyObject_HEAD_INIT(0) 0, /* Header */
c461c9b3 739 "ECPtCurve", /* @tp_name@ */
d7ab1bab 740 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
741 0, /* @tp_itemsize@ */
742
743 ecpt_pydealloc, /* @tp_dealloc@ */
744 0, /* @tp_print@ */
745 0, /* @tp_getattr@ */
746 0, /* @tp_setattr@ */
747 0, /* @tp_compare@ */
748 0, /* @tp_repr@ */
749 &ecptcurve_pynumber, /* @tp_as_number@ */
750 0, /* @tp_as_sequence@ */
751 0, /* @tp_as_mapping@ */
752 0, /* @tp_hash@ */
753 0, /* @tp_call@ */
754 0, /* @tp_str@ */
755 0, /* @tp_getattro@ */
756 0, /* @tp_setattro@ */
757 0, /* @tp_as_buffer@ */
758 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
759 Py_TPFLAGS_CHECKTYPES |
760 Py_TPFLAGS_BASETYPE,
761
762 /* @tp_doc@ */
763"Elliptic curve points; abstract base class for points on given curves.",
764
765 0, /* @tp_traverse@ */
766 0, /* @tp_clear@ */
767 0, /* @tp_richcompare@ */
768 0, /* @tp_weaklistoffset@ */
769 0, /* @tp_iter@ */
963a6148 770 0, /* @tp_iternext@ */
d7ab1bab 771 ecpt_pymethods, /* @tp_methods@ */
772 0, /* @tp_members@ */
773 ecpt_pygetset, /* @tp_getset@ */
774 0, /* @tp_base@ */
775 0, /* @tp_dict@ */
776 0, /* @tp_descr_get@ */
777 0, /* @tp_descr_set@ */
778 0, /* @tp_dictoffset@ */
779 0, /* @tp_init@ */
780 PyType_GenericAlloc, /* @tp_alloc@ */
781 abstract_pynew, /* @tp_new@ */
3aa33042 782 0, /* @tp_free@ */
d7ab1bab 783 0 /* @tp_is_gc@ */
784};
785
786/*----- Elliptic curves themselves ----------------------------------------*/
787
788static PyObject *eccurve_pyrichcompare(PyObject *x, PyObject *y, int op)
789{
790 int b = ec_samep(ECCURVE_C(x), ECCURVE_C(y));
791 switch (op) {
792 case Py_EQ: break;
793 case Py_NE: b = !b;
794 default: TYERR("can't order elliptic curves");
795 }
796 return (getbool(b));
797end:
798 return (0);
799}
800
801static PyObject *ecmmul_id(PyObject *me)
802 { ec p = EC_INIT; return (ecpt_pywrap(me, &p)); }
803
804static int ecmmul_fill(void *pp, PyObject *me, PyObject *x, PyObject *m)
805{
806 ec_mulfactor *f = pp;
807
50bff227 808 EC_CREATE(&f->base);
d7ab1bab 809 if (getecpt(ECCURVE_C(me), &f->base, x) ||
810 (f->exp = getmp(m)) == 0)
811 return (-1);
d7ab1bab 812 return (0);
813}
814
815static PyObject *ecmmul_exp(PyObject *me, void *pp, int n)
816{
817 ec p = EC_INIT;
818 ec_immul(ECCURVE_C(me), &p, pp, n);
819 return (ecpt_pywrap(me, &p));
820}
821
822static void ecmmul_drop(void *pp)
823{
824 ec_mulfactor *f = pp;
825 EC_DESTROY(&f->base);
826 MP_DROP(f->exp);
827}
828
829static PyObject *ecmeth_mmul(PyObject *me, PyObject *arg)
830{
831 return (mexp_common(me, arg, sizeof(ec_mulfactor),
832 ecmmul_id, ecmmul_fill, ecmmul_exp, ecmmul_drop));
833}
834
835static PyObject *meth__ECPtCurve_fromraw(PyObject *me, PyObject *arg)
836{
837 char *p;
6b54260d 838 Py_ssize_t len;
d7ab1bab 839 buf b;
840 PyObject *rc = 0;
841 ec_curve *cc;
842 ec pp = EC_INIT;
843
844 if (!PyArg_ParseTuple(arg, "Os#:fromraw", &me, &p, &len))
845 return (0);
846 buf_init(&b, p, len);
847 cc = ECCURVE_C(me);
848 if (ec_getraw(cc, &b, &pp))
80f7cd89 849 VALERR("bad point");
d7ab1bab 850 EC_IN(cc, &pp, &pp);
851 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
852end:
853 return (rc);
854}
855
e12df5f3
MW		 856static PyObject *meth__ECPtCurve_os2ecp(PyObject *me,
857 PyObject *arg, PyObject *kw)
858{
859 char *p;
6b54260d 860 Py_ssize_t len;
e12df5f3
MW		 861 buf b;
862 PyObject *rc = 0;
863 ec_curve *cc;
864 int f = EC_XONLY | EC_LSB | EC_SORT | EC_EXPLY;
865 ec pp = EC_INIT;
866 char *kwlist[] = { "buf", "flags", 0 };
867
868 if (!PyArg_ParseTupleAndKeywords(arg, kw, "Os#|f:os2ecp", kwlist,
869 &me, &p, &len, &f))
870 return (0);
871 buf_init(&b, p, len);
872 cc = ECCURVE_C(me);
873 if (ec_os2ecp(cc, f, &b, &pp)) VALERR("bad point");
874 EC_IN(cc, &pp, &pp);
875 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
876end:
877 return (rc);
878}
879
d7ab1bab 880static PyObject *meth__ECPt_frombuf(PyObject *me, PyObject *arg)
881{
882 buf b;
883 char *p;
6b54260d 884 Py_ssize_t sz;
d7ab1bab 885 PyObject *rc = 0;
886 ec pp = EC_INIT;
887
888 if (!PyArg_ParseTuple(arg, "Os#:frombuf", &me, &p, &sz)) goto end;
889 buf_init(&b, p, sz);
890 if (buf_getec(&b, &pp)) VALERR("malformed data");
891 rc = Py_BuildValue("(NN)", ecpt_pywrapout(me, &pp),
892 bytestring_pywrapbuf(&b));
893end:
894 return (rc);
895}
896
897static PyObject *meth__ECPt_parse(PyObject *me, PyObject *arg)
898{
899 char *p;
900 qd_parse qd;
901 PyObject *rc = 0;
902 ec pp = EC_INIT;
903
904 if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p)) goto end;
905 qd.p = p;
906 qd.e = 0;
80f7cd89 907 if (!ec_ptparse(&qd, &pp)) VALERR(qd.e);
d7ab1bab 908 rc = Py_BuildValue("(Ns)", ecpt_pywrapout(me, &pp), qd.p);
909end:
910 return (rc);
911}
912
913static void eccurve_pydealloc(PyObject *me)
914{
915 ec_destroycurve(ECCURVE_C(me));
916 Py_DECREF(ECCURVE_FOBJ(me));
917 PyType_Type.tp_dealloc(me);
918}
919
920static PyObject *ecmeth_find(PyObject *me, PyObject *arg)
921{
922 PyObject *x;
923 mp *xx = 0;
924 ec p = EC_INIT;
925 PyObject *rc = 0;
926
927 if (!PyArg_ParseTuple(arg, "O:find", &x)) goto end;
928 if (FIELD_PYCHECK(x) && FE_F(x) == ECCURVE_C(me)->f)
929 xx = MP_COPY(FE_X(x));
930 else if ((xx = getmp(x)) == 0)
931 goto end;
932 else
933 xx = F_IN(ECCURVE_C(me)->f, xx, xx);
934 if (EC_FIND(ECCURVE_C(me), &p, xx) == 0)
935 VALERR("not on the curve");
936 rc = ecpt_pywrap(me, &p);
937end:
938 if (xx) MP_DROP(xx);
939 return (rc);
940}
941
942static PyObject *ecmeth_rand(PyObject *me, PyObject *arg, PyObject *kw)
943{
944 char *kwlist[] = { "rng", 0 };
945 grand *r = &rand_global;
946 ec p = EC_INIT;
947
948 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:rand", kwlist,
949 convgrand, &r))
950 return (0);
951 ec_rand(ECCURVE_C(me), &p, r);
952 EC_IN(ECCURVE_C(me), &p, &p);
953 return (ecpt_pywrap(me, &p));
954}
955
956static PyObject *eccurve_dopywrap(PyTypeObject *ty,
957 PyObject *fobj, ec_curve *c)
958{
df9f8366 959 eccurve_pyobj *cobj = newtype(ty, 0, c->ops->name);
d7ab1bab 960 cobj->c = c;
961 cobj->fobj = fobj;
24b3d57b
MW		 962 cobj->ty.ht_type.tp_basicsize = sizeof(ecpt_pyobj);
963 cobj->ty.ht_type.tp_base = ecptcurve_pytype;
d7ab1bab 964 Py_INCREF(ecptcurve_pytype);
24b3d57b
MW		 965 cobj->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
966 Py_TPFLAGS_BASETYPE |
967 Py_TPFLAGS_CHECKTYPES |
968 Py_TPFLAGS_HEAPTYPE);
969 cobj->ty.ht_type.tp_alloc = PyType_GenericAlloc;
970 cobj->ty.ht_type.tp_free = 0;
971 cobj->ty.ht_type.tp_new = ecpt_pynew;
dc075750 972 typeready(&cobj->ty.ht_type);
d7ab1bab 973 return ((PyObject *)cobj);
974}
975
976PyObject *eccurve_pywrap(PyObject *fobj, ec_curve *c)
977{
978 PyTypeObject *ty;
979
980 if (!fobj)
981 fobj = field_pywrap(c->f);
982 else
983 Py_INCREF(fobj);
984 assert(FIELD_F(fobj) == c->f);
985 if (strcmp(EC_NAME(c), "prime") == 0)
986 ty = ecprimecurve_pytype;
987 else if (strcmp(EC_NAME(c), "primeproj") == 0)
988 ty = ecprimeprojcurve_pytype;
989 else if (strcmp(EC_NAME(c), "bin") == 0)
990 ty = ecbincurve_pytype;
991 else if (strcmp(EC_NAME(c), "binproj") == 0)
992 ty = ecbinprojcurve_pytype;
993 else
994 abort();
995 return (eccurve_dopywrap(ty, fobj, c));
996}
997
998static PyObject *eccurve_pynew(PyTypeObject *ty,
999 ec_curve *(*make)(field *, mp *, mp *),
1000 PyObject *arg, PyObject *kw)
1001{
1002 PyObject *fobj;
1003 PyObject *cobj = 0;
1004 char *kwlist[] = { "field", "a", "b", 0 };
1005 mp *aa = 0, *bb = 0;
1006
5f959e50 1007 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O&O&", kwlist,
d7ab1bab 1008 field_pytype, &fobj,
1009 convmp, &aa, convmp, &bb))
1010 goto end;
1011 Py_INCREF(fobj);
1012 cobj = eccurve_dopywrap(ty, fobj, make(FIELD_F(fobj), aa, bb));
1013end:
1014 if (aa) MP_DROP(aa);
1015 if (bb) MP_DROP(bb);
1016 return (cobj);
1017}
1018
1019static PyObject *meth__ECCurve_parse(PyObject *me, PyObject *arg)
1020{
1021 char *p;
1022 qd_parse qd;
1023 ec_curve *c;
1024 PyObject *rc = 0;
1025
46e6ad89 1026 if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p))
d7ab1bab 1027 goto end;
1028 qd.p = p;
1029 qd.e = 0;
1030 if ((c = ec_curveparse(&qd)) == 0)
80f7cd89 1031 VALERR(qd.e);
d7ab1bab 1032 rc = eccurve_pywrap(0, c);
1033end:
1034 return (rc);
1035}
1036
1037static PyObject *ecget_name(PyObject *me, void *hunoz)
1038 { return (PyString_FromString(EC_NAME(ECCURVE_C(me)))); }
1039
1040static PyObject *ecget_a(PyObject *me, void *hunoz)
1041 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->a))); }
1042
b2687a0a 1043static PyObject *ecget_b(PyObject *me, void *hunoz)
d7ab1bab 1044 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->b))); }
1045
1046static PyObject *ecget_field(PyObject *me, void *hunoz)
1047 { RETURN_OBJ(ECCURVE_FOBJ(me)); }
1048
1049static PyObject *ecget_inf(PyObject *me, void *hunoz)
1050 { ec inf = EC_INIT; return (ecpt_pywrap(me, &inf)); }
1051
1052static PyGetSetDef eccurve_pygetset[] = {
1053#define GETSETNAME(op, name) ec##op##_##name
1054 GET (name, "E.name -> name of this kind of curve")
1055 GET (a, "E.a -> first parameter of curve")
1056 GET (b, "E.b -> second parameter of curve")
1057 GET (field, "E.field -> finite field containing this curve")
1058 GET (inf, "E.inf -> point at infinity of this curve")
1059#undef GETSETNAME
1060 { 0 }
b2687a0a 1061};
d7ab1bab 1062
1063static PyMethodDef eccurve_pymethods[] = {
1064#define METHNAME(name) ecmeth_##name
1065 METH (mmul, "\
1066E.mmul([(P0, N0), (P1, N1), ...]) = N0 P0 + N1 P1 + ...")
1067 METH (find, "E.find(X) -> P")
1068 KWMETH(rand, "E.rand(rng = rand) ->P")
1069#undef METHNAME
1070 { 0 }
1071};
1072
1073static PyTypeObject eccurve_pytype_skel = {
6d4db0bf 1074 PyObject_HEAD_INIT(0) 0, /* Header */
c461c9b3 1075 "ECCurve", /* @tp_name@ */
d7ab1bab 1076 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1077 0, /* @tp_itemsize@ */
1078
1079 eccurve_pydealloc, /* @tp_dealloc@ */
1080 0, /* @tp_print@ */
1081 0, /* @tp_getattr@ */
1082 0, /* @tp_setattr@ */
1083 0, /* @tp_compare@ */
1084 0, /* @tp_repr@ */
1085 0, /* @tp_as_number@ */
1086 0, /* @tp_as_sequence@ */
1087 0, /* @tp_as_mapping@ */
1088 0, /* @tp_hash@ */
1089 0, /* @tp_call@ */
1090 0, /* @tp_str@ */
1091 0, /* @tp_getattro@ */
1092 0, /* @tp_setattro@ */
1093 0, /* @tp_as_buffer@ */
1094 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1095 Py_TPFLAGS_BASETYPE,
1096
1097 /* @tp_doc@ */
1098 "An elliptic curve. Abstract class.",
1099
1100 0, /* @tp_traverse@ */
1101 0, /* @tp_clear@ */
1102 eccurve_pyrichcompare, /* @tp_richcompare@ */
1103 0, /* @tp_weaklistoffset@ */
1104 0, /* @tp_iter@ */
963a6148 1105 0, /* @tp_iternext@ */
d7ab1bab 1106 eccurve_pymethods, /* @tp_methods@ */
1107 0, /* @tp_members@ */
1108 eccurve_pygetset, /* @tp_getset@ */
1109 0, /* @tp_base@ */
1110 0, /* @tp_dict@ */
1111 0, /* @tp_descr_get@ */
1112 0, /* @tp_descr_set@ */
1113 0, /* @tp_dictoffset@ */
1114 0, /* @tp_init@ */
1115 PyType_GenericAlloc, /* @tp_alloc@ */
1116 abstract_pynew, /* @tp_new@ */
3aa33042 1117 0, /* @tp_free@ */
d7ab1bab 1118 0 /* @tp_is_gc@ */
1119};
1120
1121static PyObject *ecprimecurve_pynew(PyTypeObject *ty,
1122 PyObject *arg, PyObject *kw)
1123{
1124 return (eccurve_pynew(ty, ec_prime, arg, kw));
1125}
1126
1127static PyTypeObject ecprimecurve_pytype_skel = {
6d4db0bf 1128 PyObject_HEAD_INIT(0) 0, /* Header */
c461c9b3 1129 "ECPrimeCurve", /* @tp_name@ */
d7ab1bab 1130 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1131 0, /* @tp_itemsize@ */
1132
1133 eccurve_pydealloc, /* @tp_dealloc@ */
1134 0, /* @tp_print@ */
1135 0, /* @tp_getattr@ */
1136 0, /* @tp_setattr@ */
1137 0, /* @tp_compare@ */
1138 0, /* @tp_repr@ */
1139 0, /* @tp_as_number@ */
1140 0, /* @tp_as_sequence@ */
1141 0, /* @tp_as_mapping@ */
1142 0, /* @tp_hash@ */
1143 0, /* @tp_call@ */
1144 0, /* @tp_str@ */
1145 0, /* @tp_getattro@ */
1146 0, /* @tp_setattro@ */
1147 0, /* @tp_as_buffer@ */
1148 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1149 Py_TPFLAGS_BASETYPE,
1150
1151 /* @tp_doc@ */
1152 "An elliptic curve over a prime field. Use ecprimeprojcurve.",
1153
1154 0, /* @tp_traverse@ */
1155 0, /* @tp_clear@ */
1156 eccurve_pyrichcompare, /* @tp_richcompare@ */
1157 0, /* @tp_weaklistoffset@ */
1158 0, /* @tp_iter@ */
963a6148 1159 0, /* @tp_iternext@ */
d7ab1bab 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@ */
3aa33042 1171 0, /* @tp_free@ */
d7ab1bab 1172 0 /* @tp_is_gc@ */
1173};
1174
1175static PyObject *ecprimeprojcurve_pynew(PyTypeObject *ty,
1176 PyObject *arg, PyObject *kw)
1177{
1178 return (eccurve_pynew(ty, ec_primeproj, arg, kw));
1179}
1180
1181static PyTypeObject ecprimeprojcurve_pytype_skel = {
6d4db0bf 1182 PyObject_HEAD_INIT(0) 0, /* Header */
c461c9b3 1183 "ECPrimeProjCurve", /* @tp_name@ */
d7ab1bab 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 "An elliptic curve over a prime field, using projective coordinates.",
1207
1208 0, /* @tp_traverse@ */
1209 0, /* @tp_clear@ */
1210 eccurve_pyrichcompare, /* @tp_richcompare@ */
1211 0, /* @tp_weaklistoffset@ */
1212 0, /* @tp_iter@ */
963a6148 1213 0, /* @tp_iternext@ */
d7ab1bab 1214 0, /* @tp_methods@ */
1215 0, /* @tp_members@ */
1216 0, /* @tp_getset@ */
1217 0, /* @tp_base@ */
1218 0, /* @tp_dict@ */
1219 0, /* @tp_descr_get@ */
1220 0, /* @tp_descr_set@ */
1221 0, /* @tp_dictoffset@ */
1222 0, /* @tp_init@ */
1223 PyType_GenericAlloc, /* @tp_alloc@ */
1224 ecprimeprojcurve_pynew, /* @tp_new@ */
3aa33042 1225 0, /* @tp_free@ */
d7ab1bab 1226 0 /* @tp_is_gc@ */
1227};
1228
1229static PyObject *ecbincurve_pynew(PyTypeObject *ty,
1230 PyObject *arg, PyObject *kw)
1231{
1232 return (eccurve_pynew(ty, ec_bin, arg, kw));
1233}
1234
1235static PyTypeObject ecbincurve_pytype_skel = {
6d4db0bf 1236 PyObject_HEAD_INIT(0) 0, /* Header */
c461c9b3 1237 "ECBinCurve", /* @tp_name@ */
d7ab1bab 1238 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1239 0, /* @tp_itemsize@ */
1240
1241 eccurve_pydealloc, /* @tp_dealloc@ */
1242 0, /* @tp_print@ */
1243 0, /* @tp_getattr@ */
1244 0, /* @tp_setattr@ */
1245 0, /* @tp_compare@ */
1246 0, /* @tp_repr@ */
1247 0, /* @tp_as_number@ */
1248 0, /* @tp_as_sequence@ */
1249 0, /* @tp_as_mapping@ */
1250 0, /* @tp_hash@ */
1251 0, /* @tp_call@ */
1252 0, /* @tp_str@ */
1253 0, /* @tp_getattro@ */
1254 0, /* @tp_setattro@ */
1255 0, /* @tp_as_buffer@ */
1256 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1257 Py_TPFLAGS_BASETYPE,
1258
1259 /* @tp_doc@ */
1260 "An elliptic curve over a binary field. Use ecbinprojcurve.",
1261
1262 0, /* @tp_traverse@ */
1263 0, /* @tp_clear@ */
1264 eccurve_pyrichcompare, /* @tp_richcompare@ */
1265 0, /* @tp_weaklistoffset@ */
1266 0, /* @tp_iter@ */
963a6148 1267 0, /* @tp_iternext@ */
d7ab1bab 1268 0, /* @tp_methods@ */
1269 0, /* @tp_members@ */
1270 0, /* @tp_getset@ */
1271 0, /* @tp_base@ */
1272 0, /* @tp_dict@ */
1273 0, /* @tp_descr_get@ */
1274 0, /* @tp_descr_set@ */
1275 0, /* @tp_dictoffset@ */
1276 0, /* @tp_init@ */
1277 PyType_GenericAlloc, /* @tp_alloc@ */
1278 ecbincurve_pynew, /* @tp_new@ */
3aa33042 1279 0, /* @tp_free@ */
d7ab1bab 1280 0 /* @tp_is_gc@ */
1281};
1282
1283static PyObject *ecbinprojcurve_pynew(PyTypeObject *ty,
1284 PyObject *arg, PyObject *kw)
1285{
1286 return (eccurve_pynew(ty, ec_binproj, arg, kw));
1287}
1288
1289static PyTypeObject ecbinprojcurve_pytype_skel = {
6d4db0bf 1290 PyObject_HEAD_INIT(0) 0, /* Header */
c461c9b3 1291 "ECBinProjCurve", /* @tp_name@ */
d7ab1bab 1292 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1293 0, /* @tp_itemsize@ */
1294
1295 eccurve_pydealloc, /* @tp_dealloc@ */
1296 0, /* @tp_print@ */
1297 0, /* @tp_getattr@ */
1298 0, /* @tp_setattr@ */
1299 0, /* @tp_compare@ */
1300 0, /* @tp_repr@ */
1301 0, /* @tp_as_number@ */
1302 0, /* @tp_as_sequence@ */
1303 0, /* @tp_as_mapping@ */
1304 0, /* @tp_hash@ */
1305 0, /* @tp_call@ */
1306 0, /* @tp_str@ */
1307 0, /* @tp_getattro@ */
1308 0, /* @tp_setattro@ */
1309 0, /* @tp_as_buffer@ */
1310 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1311 Py_TPFLAGS_BASETYPE,
1312
1313 /* @tp_doc@ */
1314 "An elliptic curve over a binary field, using projective coordinates.",
1315
1316 0, /* @tp_traverse@ */
1317 0, /* @tp_clear@ */
1318 eccurve_pyrichcompare, /* @tp_richcompare@ */
1319 0, /* @tp_weaklistoffset@ */
1320 0, /* @tp_iter@ */
963a6148 1321 0, /* @tp_iternext@ */
d7ab1bab 1322 0, /* @tp_methods@ */
1323 0, /* @tp_members@ */
1324 0, /* @tp_getset@ */
1325 0, /* @tp_base@ */
1326 0, /* @tp_dict@ */
1327 0, /* @tp_descr_get@ */
1328 0, /* @tp_descr_set@ */
1329 0, /* @tp_dictoffset@ */
1330 0, /* @tp_init@ */
1331 PyType_GenericAlloc, /* @tp_alloc@ */
1332 ecbinprojcurve_pynew, /* @tp_new@ */
3aa33042 1333 0, /* @tp_free@ */
d7ab1bab 1334 0 /* @tp_is_gc@ */
1335};
1336
1337/*----- Curve info --------------------------------------------------------*/
1338
1339static int ncurves = -1;
1340
1341void ecinfo_copy(ec_info *eic, const ec_info *ei)
1342{
1343 eic->c = eccurve_copy(ei->c);
1344 EC_CREATE(&eic->g);
1345 EC_COPY(&eic->g, &ei->g);
1346 eic->r = MP_COPY(ei->r);
1347 eic->h = MP_COPY(ei->h);
1348}
1349
1350PyObject *ecinfo_pywrap(ec_info *ei)
1351{
1352 ecinfo_pyobj *o;
1353
1354 o = PyObject_NEW(ecinfo_pyobj, ecinfo_pytype);
1355 o->ei = *ei;
1356 o->cobj = eccurve_pywrap(0, o->ei.c);
1357 Py_INCREF(o->cobj);
1358 return ((PyObject *)o);
1359}
1360
1361static void ecinfo_pydealloc(PyObject *me)
1362{
1363 ec_info *ei = ECINFO_EI(me);
1364 EC_DESTROY(&ei->g);
1365 MP_DROP(ei->r);
1366 MP_DROP(ei->h);
1367 Py_DECREF(ECINFO_COBJ(me));
3aa33042 1368 FREEOBJ(me);
d7ab1bab 1369}
1370
1371static PyObject *ecinfo_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
1372{
1373 ec_info ei = { 0 };
1374 PyObject *e, *g;
1375 char *kwlist[] = { "curve", "G", "r", "h", 0 };
1376 ecinfo_pyobj *rc = 0;
1377
1378 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O!O&O&:new", kwlist,
1379 eccurve_pytype, &e, ecpt_pytype, &g,
1380 convmp, &ei.r, convmp, &ei.h))
1381 goto end;
1382 if (ECPT_C(g) != ECCURVE_C(e) && !ec_samep(ECPT_C(g), ECCURVE_C(e)))
1383 TYERR("point not from this curve");
1384 ei.c = ECCURVE_C(e);
1385 EC_CREATE(&ei.g);
30720615 1386 EC_OUT(ei.c, &ei.g, ECPT_P(g));
d7ab1bab 1387 rc = (ecinfo_pyobj *)ty->tp_alloc(ty, 0);
1388 rc->ei = ei;
1389 rc->cobj = e;
1390 Py_INCREF(rc->cobj);
1391 return ((PyObject *)rc);
1392
1393end:
1394 mp_drop(ei.r);
1395 mp_drop(ei.h);
1396 return (0);
1397}
1398
1399static PyObject *meth__ECInfo_parse(PyObject *me, PyObject *arg)
1400{
1401 char *p;
1402 qd_parse qd;
1403 ec_info ei;
1404 PyObject *rc = 0;
1405
1406 if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p))
1407 goto end;
1408 qd.p = p;
1409 qd.e = 0;
1410 if (ec_infoparse(&qd, &ei))
80f7cd89 1411 VALERR(qd.e);
d7ab1bab 1412 rc = Py_BuildValue("(Ns)", ecinfo_pywrap(&ei), qd.p);
1413end:
1414 return (rc);
1415}
1416
1417static PyObject *meth__ECInfo__curven(PyObject *me, PyObject *arg)
1418{
1419 int i;
1420 ec_info ei;
1421 PyObject *rc = 0;
1422
1423 if (!PyArg_ParseTuple(arg, "Oi:_curven", &me, &i)) goto end;
1424 if (i < 0 || i >= ncurves) VALERR("curve index out of range");
1425 ec_infofromdata(&ei, ectab[i].data);
1426 rc = ecinfo_pywrap(&ei);
1427end:
1428 return (rc);
1429}
1430
1431static PyObject *ecinfo_pyrichcompare(PyObject *x, PyObject *y, int op)
1432{
1433 int b = ec_sameinfop(ECINFO_EI(x), ECINFO_EI(y));
1434 switch (op) {
1435 case Py_EQ: break;
1436 case Py_NE: b = !b;
1437 default: TYERR("can't order elliptic curve infos");
1438 }
1439 return (getbool(b));
1440end:
1441 return (0);
1442}
1443
1444static PyObject *eimeth_check(PyObject *me, PyObject *arg, PyObject *kw)
1445{
1446 char *kwlist[] = { "rng", 0 };
1447 grand *r = &rand_global;
1448 const char *p;
1449
1450 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:check", kwlist,
1451 convgrand, &r))
1452 goto end;
1453 if ((p = ec_checkinfo(ECINFO_EI(me), r)) != 0)
1454 VALERR(p);
1455 RETURN_ME;
1456end:
1457 return (0);
1458}
1459
1460static PyObject *eiget_curve(PyObject *me, void *hunoz)
1461 { RETURN_OBJ(ECINFO_COBJ(me)); }
1462
1463static PyObject *eiget_G(PyObject *me, void *hunoz)
1464{
1465 ec_info *ei = ECINFO_EI(me);
1466 ec p = EC_INIT;
1467 EC_IN(ei->c, &p, &ei->g);
1468 return (ecpt_pywrap(ECINFO_COBJ(me), &p));
1469}
1470
1471static PyObject *eiget_r(PyObject *me, void *hunoz)
1472 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->r))); }
1473
1474static PyObject *eiget_h(PyObject *me, void *hunoz)
1475 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->h))); }
1476
1477static PyGetSetDef ecinfo_pygetset[] = {
1478#define GETSETNAME(op, name) ei##op##_##name
1479 GET (curve, "I.curve -> the elliptic curve")
1480 GET (G, "I.G -> generator point for the group")
1481 GET (r, "I.r -> order of the group (and hence of G")
1482 GET (h, "I.h -> cofactor of the group")
1483#undef GETSETNAME
1484 { 0 }
1485};
1486
1487static PyMethodDef ecinfo_pymethods[] = {
1488#define METHNAME(name) eimeth_##name
1489 KWMETH(check, "I.check() -> None")
1490#undef METHNAME
1491 { 0 }
1492};
1493
1494static PyTypeObject ecinfo_pytype_skel = {
6d4db0bf 1495 PyObject_HEAD_INIT(0) 0, /* Header */
c461c9b3 1496 "ECInfo", /* @tp_name@ */
d7ab1bab 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 "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@ */
963a6148 1526 0, /* @tp_iternext@ */
d7ab1bab 1527 ecinfo_pymethods, /* @tp_methods@ */
1528 0, /* @tp_members@ */
1529 ecinfo_pygetset, /* @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@ */
3aa33042 1538 0, /* @tp_free@ */
d7ab1bab 1539 0 /* @tp_is_gc@ */
1540};
1541
1542/*----- Setup -------------------------------------------------------------*/
1543
1544static PyMethodDef methods[] = {
1545#define METHNAME(func) meth_##func
b2687a0a
MW		 1546 METH (_ECPt_frombuf, "frombuf(E, STR) -> (P, REST)")
1547 METH (_ECPtCurve_fromraw, "fromraw(E, STR) -> (P, REST)")
e12df5f3 1548 KWMETH(_ECPtCurve_os2ecp, "os2ecp(E, STR, [flags = ...]) -> (P, REST)")
b2687a0a
MW		 1549 METH (_ECPt_parse, "parse(E, STR) -> (P, REST)")
1550 METH (_ECCurve_parse, "parse(STR) -> (E, REST)")
1551 METH (_ECInfo_parse, "parse(STR) -> (I, REST)")
1552 METH (_ECInfo__curven, "_curven(N) -> I")
d7ab1bab 1553#undef METHNAME
1554 { 0 }
1555};
1556
1557void ec_pyinit(void)
1558{
1559 INITTYPE(ecpt, root);
1560 INITTYPE(ecptcurve, ecpt);
1561 INITTYPE(eccurve, type);
1562 INITTYPE(ecprimecurve, eccurve);
1563 INITTYPE(ecprimeprojcurve, ecprimecurve);
1564 INITTYPE(ecbincurve, eccurve);
1565 INITTYPE(ecbinprojcurve, ecbincurve);
1566 INITTYPE(ecinfo, root);
1567 addmethods(methods);
1568}
1569
1570static PyObject *namedcurves(void)
1571{
1572 int i, j;
1573 const char *p;
1574 PyObject *d, *c;
1575
1576 d = PyDict_New();
1577 for (i = 0; ectab[i].name; i++) {
1578 p = ectab[i].name;
1579 for (j = 0; j < i; j++) {
1580 if (ectab[i].data == ectab[j].data) {
1581 c = PyDict_GetItemString(d, (/*unconst*/ char *)ectab[j].name);
1582 Py_INCREF(c);
1583 goto found;
1584 }
1585 }
1586 c = PyInt_FromLong(i);
1587 found:
98963817 1588 PyDict_SetItemString(d, (/*unconst*/ char *)p, c);
d7ab1bab 1589 Py_DECREF(c);
1590 }
1591 ncurves = i;
1592 return (d);
1593}
1594
1595void ec_pyinsert(PyObject *mod)
1596{
1597 INSERT("ECPt", ecpt_pytype);
1598 INSERT("ECPtCurve", ecptcurve_pytype);
1599 INSERT("ECCurve", eccurve_pytype);
1600 INSERT("ECPrimeCurve", ecprimecurve_pytype);
1601 INSERT("ECPrimeProjCurve", ecprimeprojcurve_pytype);
1602 INSERT("ECBinCurve", ecbincurve_pytype);
1603 INSERT("ECBinProjCurve", ecbinprojcurve_pytype);
1604 INSERT("ECInfo", ecinfo_pytype);
1605 INSERT("_eccurves", namedcurves());
1606}
1607
1608/*----- That's all, folks -------------------------------------------------*/
Catacomb cryptographic library -- Python bindings