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Various minor fixings.
[catacomb-python] / ec.c
CommitLineData
d7ab1bab 1/* -*-c-*-
2 *
3 * $Id$
4 *
5 * Elliptic curves
6 *
7 * (c) 2004 Straylight/Edgeware
8 */
9
10/*----- Licensing notice --------------------------------------------------*
11 *
12 * This file is part of the Python interface to Catacomb.
13 *
14 * Catacomb/Python is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * Catacomb/Python is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with Catacomb/Python; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 */
28
29/*----- Header files ------------------------------------------------------*/
30
31#include "catacomb-python.h"
32
33/*----- Utility functions -------------------------------------------------*/
34
35PyTypeObject *ecpt_pytype;
36PyTypeObject *ecptcurve_pytype;
37PyTypeObject *eccurve_pytype;
38PyTypeObject *ecprimecurve_pytype;
39PyTypeObject *ecprimeprojcurve_pytype;
40PyTypeObject *ecbincurve_pytype;
41PyTypeObject *ecbinprojcurve_pytype;
42PyTypeObject *ecinfo_pytype;
43
44ec_curve *eccurve_copy(ec_curve *c)
45{
46 field *f;
47 mp *a, *b;
48
49 if ((f = field_copy(c->f)) == 0)
50 return (0);
51 a = F_OUT(f, MP_NEW, c->a);
52 b = F_OUT(f, MP_NEW, c->b);
53 if (strcmp(EC_NAME(c), "prime") == 0)
54 c = ec_prime(f, a, b);
55 else if (strcmp(EC_NAME(c), "primeproj") == 0)
56 c = ec_primeproj(f, a, b);
57 else if (strcmp(EC_NAME(c), "bin") == 0)
58 c = ec_bin(f, a, b);
59 else if (strcmp(EC_NAME(c), "binproj") == 0)
60 c = ec_binproj(f, a, b);
61 else
62 c = 0;
63 MP_DROP(a);
64 MP_DROP(b);
65 if (!c) F_DESTROY(f);
66 return (c);
67}
68
69static PyObject *ecpt_dopywrap(PyObject *cobj, ec_curve *c, ec *p)
70{
71 ecpt_pyobj *z = PyObject_New(ecpt_pyobj, (PyTypeObject *)cobj);
72 z->p = *p;
73 z->c = c;
74 Py_INCREF(cobj);
75 return ((PyObject *)z);
76}
77
78PyObject *ecpt_pywrap(PyObject *cobj, ec *p)
79 { return (ecpt_dopywrap(cobj, ECCURVE_C(cobj), p)); }
80
81PyObject *ecpt_pywrapout(void *cobj, ec *p)
82{
83 ec_curve *c;
84
85 if (!PyType_IsSubtype(cobj, ecptcurve_pytype))
86 c = 0;
87 else {
88 c = ECCURVE_C(cobj);
89 EC_IN(ECCURVE_C(cobj), p, p);
90 }
91 return (ecpt_dopywrap(cobj, c, p));
92}
93
94int toecpt(ec_curve *c, ec *d, PyObject *p)
95{
96 if (ECPTCURVE_PYCHECK(p)) {
97 if (ECPT_C(p) != c && !ec_samep(ECPT_C(p), c))
98 return (-1);
99 EC_COPY(d, ECPT_P(p));
100 } else if (ECPT_PYCHECK(p))
101 EC_IN(c, d, ECPT_P(p));
102 else
103 return (-1);
104 return (0);
105}
106
107int getecpt(ec_curve *c, ec *d, PyObject *p)
108{
109 if (toecpt(c, d, p)) {
110 PyErr_Format(PyExc_TypeError, "can't convert %.100s to ecpt",
111 p->ob_type->tp_name);
112 return (-1);
113 }
114 return (0);
115}
116
117void getecptout(ec *d, PyObject *p)
118{
119 if (ECPTCURVE_PYCHECK(p))
120 EC_OUT(ECPT_C(p), d, ECPT_P(p));
121 else {
122 assert(ECPT_PYCHECK(p));
123 EC_COPY(d, ECPT_P(p));
124 }
125}
126
127int convecpt(PyObject *o, void *p)
128{
129 if (!ECPT_PYCHECK(o))
130 TYERR("want elliptic curve point");
131 getecptout(p, o);
132 return (1);
133end:
134 return (0);
135}
136
137/*----- Curve points ------------------------------------------------------*/
138
139static int ecbinop(PyObject *x, PyObject *y,
140 ec_curve **c, PyObject **cobj, ec *xx, ec *yy)
141{
142 if (ECPTCURVE_PYCHECK(x)) *cobj = ECPT_COBJ(x);
143 else if (ECPTCURVE_PYCHECK(y)) *cobj = ECPT_COBJ(y);
144 else return (-1);
145 *c = ECCURVE_C(*cobj);
146 if (toecpt(*c, xx, x) || toecpt(*c, yy, y)) return (-1);
147 return (0);
148}
149
150#define BINOP(name) \
151 static PyObject *ecpt_py##name(PyObject *x, PyObject *y) { \
152 ec xx = EC_INIT, yy = EC_INIT, zz = EC_INIT; \
153 PyObject *cobj; \
154 ec_curve *c; \
155 if (ecbinop(x, y, &c, &cobj, &xx, &yy)) RETURN_NOTIMPL; \
156 c->ops->name(c, &zz, &xx, &yy); \
157 EC_DESTROY(&xx); EC_DESTROY(&yy); \
158 return (ecpt_pywrap(ECPT_COBJ(x), &zz)); \
159 }
160BINOP(add)
161BINOP(sub)
162#undef BINOP
163
164#define UNOP(name) \
165 static PyObject *ecpt_py##name(PyObject *x) { \
166 ec zz = EC_INIT; \
167 ec_curve *c = ECPT_C(x); \
168 c->ops->name(c, &zz, ECPT_P(x)); \
169 return (ecpt_pywrap(ECPT_COBJ(x), &zz)); \
170 }
171UNOP(neg)
172#undef UNOP
173
174static PyObject *ecpt_pyid(PyObject *x) { RETURN_OBJ(x); }
175
176static int ecpt_pynonzerop(PyObject *x) { return (!EC_ATINF(ECPT_P(x))); }
177
178static void ecpt_pydealloc(PyObject *x)
179{
180 EC_DESTROY(ECPT_P(x));
181 Py_DECREF(ECPT_COBJ(x));
182 PyObject_DEL(x);
183}
184
185static PyObject *ecpt_pymul(PyObject *x, PyObject *y)
186{
187 mp *xx;
188 ec zz = EC_INIT;
189
190 if (ECPT_PYCHECK(x)) { PyObject *t; t = x; x = y; y = t; }
191 if (!ECPT_PYCHECK(y) || (xx = tomp(x)) == 0) RETURN_NOTIMPL;
192 ec_imul(ECPT_C(y), &zz, ECPT_P(y), xx);
193 return (ecpt_pywrap(ECPT_COBJ(y), &zz));
194}
195
196static long ecpt_pyhash(PyObject *me)
197{
198 long i;
199 ec p = EC_INIT;
200
201 EC_OUT(ECPT_C(me), &p, ECPT_P(me));
202 i = 0xe0fdd039; /* random perturbance */
203 if (p.x) i ^= mp_tolong(p.x);
204 if (p.y) i ^= mp_tolong(p.y);
205 if (i == -1) i = -2;
206 EC_DESTROY(&p);
207 return (i);
208}
209
210static PyObject *ecpt_pyrichcompare(PyObject *x, PyObject *y, int op)
211{
212 ec_curve *c;
213 PyObject *cobj;
214 ec p = EC_INIT, q = EC_INIT;
215 int b;
216 PyObject *rc = 0;
217
218 if (ecbinop(x, y, &c, &cobj, &p, &q)) RETURN_NOTIMPL;
219 EC_OUT(c, &p, &p);
220 EC_OUT(c, &q, &q);
221 switch (op) {
222 case Py_EQ: b = EC_EQ(&p, &q); break;
223 case Py_NE: b = !EC_EQ(&p, &q); break;
224 default: TYERR("elliptic curve points are unordered");
225 }
226 rc = getbool(b);
227end:
228 EC_DESTROY(&p);
229 EC_DESTROY(&q);
230 return (rc);
231}
232
233static PyObject *epmeth_oncurvep(PyObject *me, PyObject *arg)
234{
235 if (!PyArg_ParseTuple(arg, ":oncurvep")) return (0);
236 return (getbool(!ec_check(ECPT_C(me), ECPT_P(me))));
237}
238
239static PyObject *epmeth_dbl(PyObject *me, PyObject *arg)
240{
241 ec p = EC_INIT;
242 if (!PyArg_ParseTuple(arg, ":dbl")) return (0);
243 EC_DBL(ECPT_C(me), &p, ECPT_P(me));
244 return (ecpt_pywrap(ECPT_COBJ(me), &p));
245}
246
247static PyObject *epmeth_tobuf(PyObject *me, PyObject *arg)
248{
249 buf b;
250 ec p = EC_INIT;
251 PyObject *rc;
252 size_t n;
253
254 if (!PyArg_ParseTuple(arg, ":tobuf")) return (0);
255 getecptout(&p, me);
256 if (EC_ATINF(&p))
257 n = 2;
258 else
259 n = mp_octets(p.x) + mp_octets(p.y) + 4;
260 rc = bytestring_pywrap(0, n);
261 buf_init(&b, PyString_AS_STRING(rc), n);
262 buf_putec(&b, &p);
263 assert(BOK(&b));
264 _PyString_Resize(&rc, BLEN(&b));
265 EC_DESTROY(&p);
266 return (rc);
267}
268
269static PyObject *epmeth_toraw(PyObject *me, PyObject *arg)
270{
271 buf b;
272 PyObject *rc;
273 char *p;
274 ec_curve *c = ECPT_C(me);
275 ec pp = EC_INIT;
276 int len;
277
278 if (!PyArg_ParseTuple(arg, ":toraw")) return (0);
279 len = c->f->noctets * 2 + 1;
280 rc = bytestring_pywrap(0, len);
281 p = PyString_AS_STRING(rc);
282 buf_init(&b, p, len);
283 EC_OUT(c, &pp, ECPT_P(me));
284 ec_putraw(c, &b, &pp);
285 EC_DESTROY(&pp);
286 _PyString_Resize(&rc, BLEN(&b));
287 return (rc);
288}
289
290static PyObject *epget_curve(PyObject *me, void *hunoz)
291 { RETURN_OBJ(ECPT_COBJ(me)); }
292
293static PyObject *epncget_ix(PyObject *me, void *hunoz)
294{
295 ec p = EC_INIT;
296 PyObject *rc;
297 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
298 getecptout(&p, me);
299 rc = mp_pywrap(MP_COPY(p.x));
300 EC_DESTROY(&p);
301 return (rc);
302}
303
304static PyObject *epncget_iy(PyObject *me, void *hunoz)
305{
306 ec p = EC_INIT;
307 PyObject *rc;
308 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
309 getecptout(&p, me);
310 rc = mp_pywrap(MP_COPY(p.y));
311 EC_DESTROY(&p);
312 return (rc);
313}
314
315static PyObject *epncget_point(PyObject *me, void *hunoz)
316 { RETURN_ME; }
317
318static PyObject *epget_point(PyObject *me, void *hunoz)
319{
320 ec p = EC_INIT;
321 getecptout(&p, me);
322 return (ecpt_pywrapout(ecpt_pytype, &p));
323}
324
325static PyObject *epget_x(PyObject *me, void *hunoz)
326{
327 ec_curve *c = ECPT_C(me);
328 ec *pp = ECPT_P(me);
329 PyObject *fobj = ECPT_FOBJ(me);
330 ec p = EC_INIT;
331 PyObject *rc;
332
333 if (EC_ATINF(pp)) RETURN_NONE;
334 EC_OUT(c, &p, pp);
335 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.x));
336 EC_DESTROY(&p);
337 return (rc);
338}
339
340static PyObject *epget_y(PyObject *me, void *hunoz)
341{
342 ec_curve *c = ECPT_C(me);
343 ec *pp = ECPT_P(me);
344 PyObject *fobj = ECPT_FOBJ(me);
345 ec p = EC_INIT;
346 PyObject *rc;
347
348 if (EC_ATINF(pp)) RETURN_NONE;
349 EC_OUT(c, &p, pp);
350 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.y));
351 EC_DESTROY(&p);
352 return (rc);
353}
354
355static PyObject *epget__x(PyObject *me, void *hunoz)
356{
357 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
358 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->x)));
359}
360
361static PyObject *epget__y(PyObject *me, void *hunoz)
362{
363 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
364 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->y)));
365}
366
367static PyObject *epget__z(PyObject *me, void *hunoz)
368{
369 if (EC_ATINF(ECPT_P(me)) || !ECPT_P(me)->z) RETURN_NONE;
370 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->z)));
371}
372
373static mp *coord_in(field *f, PyObject *x)
374{
375 mp *xx;
376 if (FE_PYCHECK(x) && FE_F(x) == f)
377 return (MP_COPY(FE_X(x)));
378 else if ((xx = getmp(x)) == 0)
379 return (0);
380 else
381 return (F_IN(f, xx, xx));
382}
383
384static int ecptxl_3(ec_curve *c, ec *p,
385 PyObject *x, PyObject *y, PyObject *z)
386{
387 int rc = -1;
388
389 if (!x || !y || !z) TYERR("missing argument");
390 if (!c) VALERR("internal form with no curve!");
391 if ((p->x == coord_in(c->f, x)) == 0 ||
392 (p->y == coord_in(c->f, y)) == 0 ||
393 (z != Py_None && (p->z = coord_in(c->f, z))) == 0)
394 goto end;
395 if (!p->z) p->z = MP_COPY(c->f->one); /* just in case */
396 rc = 0;
397end:
398 return (rc);
399}
400
401static int ecptxl_2(ec_curve *c, ec *p, PyObject *x, PyObject *y)
402{
403 int rc = -1;
404
405 if (!x || !y) TYERR("missing argument");
406 if ((p->x = getmp(x)) == 0 ||
407 (p->y = getmp(y)) == 0)
408 goto end;
409 if (c) EC_IN(c, p, p);
410 rc = 0;
411end:
412 return (rc);
413}
414
415static int ecptxl_1(ec_curve *c, ec *p, PyObject *x)
416{
417 int rc = -1;
418 PyObject *y = 0, *z = 0, *t = 0;
419 mp *xx = 0;
420 const void *q;
421 int n;
422 qd_parse qd;
423
424 Py_XINCREF(x);
425 if (!x || x == Py_None)
426 /*cool*/;
427 else if (ECPT_PYCHECK(x)) {
428 getecptout(p, x);
429 goto fix;
430 } else if (PyString_Check(x)) {
431 if (PyObject_AsReadBuffer(x, &q, 0))
432 goto end;
433 qd.p = q;
434 qd.e = 0;
435 if (!ec_ptparse(&qd, p))
436 SYNERR(qd.e);
437 goto fix;
438 } else if (c && (xx = tomp(x)) != 0) {
439 xx = F_IN(c->f, xx, xx);
440 if (!EC_FIND(c, p, xx)) VALERR("not on the curve");
441 } else if (PySequence_Check(x)) {
442 t = x; x = 0;
443 n = PySequence_Size(t);
444 if (n != 2 && (n != 3 || !c))
445 TYERR("want sequence of two or three items");
446 if ((x = PySequence_GetItem(t, 0)) == 0 ||
447 (y = PySequence_GetItem(t, 1)) == 0 ||
448 (n == 3 && (z = PySequence_GetItem(t, 2)) == 0))
449 goto end;
450 rc = (n == 2) ? ecptxl_2(c, p, x, y) : ecptxl_3(c, p, x, y, z);
451 } else
452 TYERR("can't convert to curve point");
453 goto ok;
454
455fix:
456 if (c) EC_IN(c, p, p);
457ok:
458 rc = 0;
459end:
460 Py_XDECREF(x); Py_XDECREF(y); Py_XDECREF(z); Py_XDECREF(t);
461 mp_drop(xx);
462 return (rc);
463}
464
465static int ecptxl(ec_curve *c, ec *p, PyObject *x, PyObject *y, PyObject *z)
466{
467 if (z)
468 return (ecptxl_3(c, p, x, y, z));
469 else if (y)
470 return (ecptxl_2(c, p, x, y));
471 else
472 return (ecptxl_1(c, p, x));
473}
474
475static int ecpt_fromobjects(PyObject *cc, ec *p,
476 PyObject *x, PyObject *y, PyObject *z)
477{
478 ec_curve *c = 0;
479
480 if (cc && PyType_IsSubtype((PyTypeObject *)cc, ecptcurve_pytype))
481 c = ECCURVE_C(cc);
482 return (ecptxl(c, p, x, y, z));
483}
484
485static PyObject *ecptnc_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
486{
487 PyObject *x = 0, *y = 0, *z = 0;
488 ec p = EC_INIT;
489 char *kwlist[] = { "x", "y", 0 };
490
491 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OO:new", kwlist, &x, &y) ||
492 ecptxl(0, &p, x, y, z))
493 goto end;
494 return (ecpt_pywrapout(ty, &p));
495end:
496 EC_DESTROY(&p);
497 return (0);
498}
499
500static PyObject *ecpt_pyint(PyObject *me)
501{
502 ec p = EC_INIT;
503 long l;
504 PyObject *rc = 0;
505 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
506 getecptout(&p, me);
507 if (mp_tolong_checked(p.x, &l)) goto end;
508 rc = PyInt_FromLong(l);
509end:
510 EC_DESTROY(&p);
511 return (rc);
512}
513
514static PyObject *ecpt_pylong(PyObject *me)
515{
516 ec p = EC_INIT;
517 PyObject *rc = 0;
518 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
519 getecptout(&p, me);
520 rc = (PyObject *)mp_topylong(p.x);
521end:
522 EC_DESTROY(&p);
523 return (rc);
524}
525
526static PyObject *ecpt_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
527{
528 PyObject *x = 0, *y = 0, *z = 0;
529 ec p = EC_INIT;
530 char *kwlist[] = { "x", "y", "z", 0 };
531
532 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OOO:new", kwlist,
533 &x, &y, &z) ||
534 ecptxl(ECCURVE_C(ty), &p, x, y, z))
535 goto end;
536 return (ecpt_pywrap((PyObject *)ty, &p));
537end:
538 EC_DESTROY(&p);
539 return (0);
540}
541
542static PyGetSetDef ecptnc_pygetset[] = {
543#define GETSETNAME(op, name) epnc##op##_##name
544 GET (ix, "P.ix -> integer x coordinate of P")
545 GET (iy, "P.iy -> integer y coordinate of P")
546 GET (point, "P.point -> standalone curve point (no-op)")
547#undef GETSETNAME
548 { 0 }
549};
550
551static PyMethodDef ecptnc_pymethods[] = {
552#define METHNAME(func) epmeth_##func
553 METH (tobuf, "X.tobuf() -> BIN")
554#undef METHNAME
555 { 0 }
556};
557
558static PyNumberMethods ecpt_pynumber = {
559 0, /* @nb_add@ */
560 0, /* @nb_subtract@ */
561 0, /* @nb_multiply@ */
562 0, /* @nb_divide@ */
563 0, /* @nb_remainder@ */
564 0, /* @nb_divmod@ */
565 0, /* @nb_power@ */
566 0, /* @nb_negative@ */
567 0, /* @nb_positive@ */
568 0, /* @nb_absolute@ */
569 ecpt_pynonzerop, /* @nb_nonzero@ */
570 0, /* @nb_invert@ */
571 0, /* @nb_lshift@ */
572 0, /* @nb_rshift@ */
573 0, /* @nb_and@ */
574 0, /* @nb_xor@ */
575 0, /* @nb_or@ */
576 0, /* @nb_coerce@ */
577 ecpt_pyint, /* @nb_int@ */
578 ecpt_pylong, /* @nb_long@ */
579 0, /* @nb_float@ */
580 0, /* @nb_oct@ */
581 0, /* @nb_hex@ */
582
583 0, /* @nb_inplace_add@ */
584 0, /* @nb_inplace_subtract@ */
585 0, /* @nb_inplace_multiply@ */
586 0, /* @nb_inplace_divide@ */
587 0, /* @nb_inplace_remainder@ */
588 0, /* @nb_inplace_power@ */
589 0, /* @nb_inplace_lshift@ */
590 0, /* @nb_inplace_rshift@ */
591 0, /* @nb_inplace_and@ */
592 0, /* @nb_inplace_xor@ */
593 0, /* @nb_inplace_or@ */
594
595 0, /* @nb_floor_divide@ */
596 0, /* @nb_true_divide@ */
597 0, /* @nb_inplace_floor_divide@ */
598 0, /* @nb_inplace_true_divide@ */
599};
600
601static PyTypeObject ecpt_pytype_skel = {
602 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
603 "catacomb.ECPt", /* @tp_name@ */
604 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
605 0, /* @tp_itemsize@ */
606
607 ecpt_pydealloc, /* @tp_dealloc@ */
608 0, /* @tp_print@ */
609 0, /* @tp_getattr@ */
610 0, /* @tp_setattr@ */
611 0, /* @tp_compare@ */
612 0, /* @tp_repr@ */
613 &ecpt_pynumber, /* @tp_as_number@ */
614 0, /* @tp_as_sequence@ */
615 0, /* @tp_as_mapping@ */
616 ecpt_pyhash, /* @tp_hash@ */
617 0, /* @tp_call@ */
618 0, /* @tp_str@ */
619 0, /* @tp_getattro@ */
620 0, /* @tp_setattro@ */
621 0, /* @tp_as_buffer@ */
622 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
623 Py_TPFLAGS_CHECKTYPES |
624 Py_TPFLAGS_BASETYPE,
625
626 /* @tp_doc@ */
627"Elliptic curve points, not associated with any curve.",
628
629 0, /* @tp_traverse@ */
630 0, /* @tp_clear@ */
631 ecpt_pyrichcompare, /* @tp_richcompare@ */
632 0, /* @tp_weaklistoffset@ */
633 0, /* @tp_iter@ */
634 0, /* @tp_iternexr@ */
635 ecptnc_pymethods, /* @tp_methods@ */
636 0, /* @tp_members@ */
637 ecptnc_pygetset, /* @tp_getset@ */
638 0, /* @tp_base@ */
639 0, /* @tp_dict@ */
640 0, /* @tp_descr_get@ */
641 0, /* @tp_descr_set@ */
642 0, /* @tp_dictoffset@ */
643 0, /* @tp_init@ */
644 PyType_GenericAlloc, /* @tp_alloc@ */
645 ecptnc_pynew, /* @tp_new@ */
646 _PyObject_Del, /* @tp_free@ */
647 0 /* @tp_is_gc@ */
648};
649
650static PyGetSetDef ecpt_pygetset[] = {
651#define GETSETNAME(op, name) ep##op##_##name
652 GET (curve, "P.curve -> elliptic curve containing P")
653 GET (point, "P.point -> standalone curve point")
654 GET (x, "P.x -> Cartesian x coordinate of P")
655 GET (y, "P.y -> Cartesian y coordinate of P")
656 GET (_x, "P._x -> internal x coordinate of P")
657 GET (_y, "P._y -> internal y coordinate of P")
658 GET (_z, "P._z -> internal z coordinate of P, or None")
659#undef GETSETNAME
660 { 0 }
661};
662
663static PyMethodDef ecpt_pymethods[] = {
664#define METHNAME(func) epmeth_##func
665 METH (toraw, "X.toraw() -> BIN")
666 METH (dbl, "X.dbl() -> X + X")
667#undef METHNAME
668 { 0 }
669};
670
671static PyNumberMethods ecptcurve_pynumber = {
672 ecpt_pyadd, /* @nb_add@ */
673 ecpt_pysub, /* @nb_subtract@ */
674 ecpt_pymul, /* @nb_multiply@ */
675 0, /* @nb_divide@ */
676 0, /* @nb_remainder@ */
677 0, /* @nb_divmod@ */
678 0, /* @nb_power@ */
679 ecpt_pyneg, /* @nb_negative@ */
680 ecpt_pyid, /* @nb_positive@ */
681 0, /* @nb_absolute@ */
682 0, /* @nb_nonzero@ */
683 0, /* @nb_invert@ */
684 0, /* @nb_lshift@ */
685 0, /* @nb_rshift@ */
686 0, /* @nb_and@ */
687 0, /* @nb_xor@ */
688 0, /* @nb_or@ */
689 0, /* @nb_coerce@ */
690 0, /* @nb_int@ */
691 0, /* @nb_long@ */
692 0, /* @nb_float@ */
693 0, /* @nb_oct@ */
694 0, /* @nb_hex@ */
695
696 0, /* @nb_inplace_add@ */
697 0, /* @nb_inplace_subtract@ */
698 0, /* @nb_inplace_multiply@ */
699 0, /* @nb_inplace_divide@ */
700 0, /* @nb_inplace_remainder@ */
701 0, /* @nb_inplace_power@ */
702 0, /* @nb_inplace_lshift@ */
703 0, /* @nb_inplace_rshift@ */
704 0, /* @nb_inplace_and@ */
705 0, /* @nb_inplace_xor@ */
706 0, /* @nb_inplace_or@ */
707
708 0, /* @nb_floor_divide@ */
709 0, /* @nb_true_divide@ */
710 0, /* @nb_inplace_floor_divide@ */
711 0, /* @nb_inplace_true_divide@ */
712};
713
714static PyTypeObject ecptcurve_pytype_skel = {
715 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
716 "catacomb.ECPtCurve", /* @tp_name@ */
717 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
718 0, /* @tp_itemsize@ */
719
720 ecpt_pydealloc, /* @tp_dealloc@ */
721 0, /* @tp_print@ */
722 0, /* @tp_getattr@ */
723 0, /* @tp_setattr@ */
724 0, /* @tp_compare@ */
725 0, /* @tp_repr@ */
726 &ecptcurve_pynumber, /* @tp_as_number@ */
727 0, /* @tp_as_sequence@ */
728 0, /* @tp_as_mapping@ */
729 0, /* @tp_hash@ */
730 0, /* @tp_call@ */
731 0, /* @tp_str@ */
732 0, /* @tp_getattro@ */
733 0, /* @tp_setattro@ */
734 0, /* @tp_as_buffer@ */
735 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
736 Py_TPFLAGS_CHECKTYPES |
737 Py_TPFLAGS_BASETYPE,
738
739 /* @tp_doc@ */
740"Elliptic curve points; abstract base class for points on given curves.",
741
742 0, /* @tp_traverse@ */
743 0, /* @tp_clear@ */
744 0, /* @tp_richcompare@ */
745 0, /* @tp_weaklistoffset@ */
746 0, /* @tp_iter@ */
747 0, /* @tp_iternexr@ */
748 ecpt_pymethods, /* @tp_methods@ */
749 0, /* @tp_members@ */
750 ecpt_pygetset, /* @tp_getset@ */
751 0, /* @tp_base@ */
752 0, /* @tp_dict@ */
753 0, /* @tp_descr_get@ */
754 0, /* @tp_descr_set@ */
755 0, /* @tp_dictoffset@ */
756 0, /* @tp_init@ */
757 PyType_GenericAlloc, /* @tp_alloc@ */
758 abstract_pynew, /* @tp_new@ */
759 _PyObject_Del, /* @tp_free@ */
760 0 /* @tp_is_gc@ */
761};
762
763/*----- Elliptic curves themselves ----------------------------------------*/
764
765static PyObject *eccurve_pyrichcompare(PyObject *x, PyObject *y, int op)
766{
767 int b = ec_samep(ECCURVE_C(x), ECCURVE_C(y));
768 switch (op) {
769 case Py_EQ: break;
770 case Py_NE: b = !b;
771 default: TYERR("can't order elliptic curves");
772 }
773 return (getbool(b));
774end:
775 return (0);
776}
777
778static PyObject *ecmmul_id(PyObject *me)
779 { ec p = EC_INIT; return (ecpt_pywrap(me, &p)); }
780
781static int ecmmul_fill(void *pp, PyObject *me, PyObject *x, PyObject *m)
782{
783 ec_mulfactor *f = pp;
784
785 if (getecpt(ECCURVE_C(me), &f->base, x) ||
786 (f->exp = getmp(m)) == 0)
787 return (-1);
788 f->base = *ECPT_P(x);
789 return (0);
790}
791
792static PyObject *ecmmul_exp(PyObject *me, void *pp, int n)
793{
794 ec p = EC_INIT;
795 ec_immul(ECCURVE_C(me), &p, pp, n);
796 return (ecpt_pywrap(me, &p));
797}
798
799static void ecmmul_drop(void *pp)
800{
801 ec_mulfactor *f = pp;
802 EC_DESTROY(&f->base);
803 MP_DROP(f->exp);
804}
805
806static PyObject *ecmeth_mmul(PyObject *me, PyObject *arg)
807{
808 return (mexp_common(me, arg, sizeof(ec_mulfactor),
809 ecmmul_id, ecmmul_fill, ecmmul_exp, ecmmul_drop));
810}
811
812static PyObject *meth__ECPtCurve_fromraw(PyObject *me, PyObject *arg)
813{
814 char *p;
815 int len;
816 buf b;
817 PyObject *rc = 0;
818 ec_curve *cc;
819 ec pp = EC_INIT;
820
821 if (!PyArg_ParseTuple(arg, "Os#:fromraw", &me, &p, &len))
822 return (0);
823 buf_init(&b, p, len);
824 cc = ECCURVE_C(me);
825 if (ec_getraw(cc, &b, &pp))
826 SYNERR("bad point");
827 EC_IN(cc, &pp, &pp);
828 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
829end:
830 return (rc);
831}
832
833static PyObject *meth__ECPt_frombuf(PyObject *me, PyObject *arg)
834{
835 buf b;
836 char *p;
837 int sz;
838 PyObject *rc = 0;
839 ec pp = EC_INIT;
840
841 if (!PyArg_ParseTuple(arg, "Os#:frombuf", &me, &p, &sz)) goto end;
842 buf_init(&b, p, sz);
843 if (buf_getec(&b, &pp)) VALERR("malformed data");
844 rc = Py_BuildValue("(NN)", ecpt_pywrapout(me, &pp),
845 bytestring_pywrapbuf(&b));
846end:
847 return (rc);
848}
849
850static PyObject *meth__ECPt_parse(PyObject *me, PyObject *arg)
851{
852 char *p;
853 qd_parse qd;
854 PyObject *rc = 0;
855 ec pp = EC_INIT;
856
857 if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p)) goto end;
858 qd.p = p;
859 qd.e = 0;
860 if (!ec_ptparse(&qd, &pp)) SYNERR(qd.e);
861 rc = Py_BuildValue("(Ns)", ecpt_pywrapout(me, &pp), qd.p);
862end:
863 return (rc);
864}
865
866static void eccurve_pydealloc(PyObject *me)
867{
868 ec_destroycurve(ECCURVE_C(me));
869 Py_DECREF(ECCURVE_FOBJ(me));
870 PyType_Type.tp_dealloc(me);
871}
872
873static PyObject *ecmeth_find(PyObject *me, PyObject *arg)
874{
875 PyObject *x;
876 mp *xx = 0;
877 ec p = EC_INIT;
878 PyObject *rc = 0;
879
880 if (!PyArg_ParseTuple(arg, "O:find", &x)) goto end;
881 if (FIELD_PYCHECK(x) && FE_F(x) == ECCURVE_C(me)->f)
882 xx = MP_COPY(FE_X(x));
883 else if ((xx = getmp(x)) == 0)
884 goto end;
885 else
886 xx = F_IN(ECCURVE_C(me)->f, xx, xx);
887 if (EC_FIND(ECCURVE_C(me), &p, xx) == 0)
888 VALERR("not on the curve");
889 rc = ecpt_pywrap(me, &p);
890end:
891 if (xx) MP_DROP(xx);
892 return (rc);
893}
894
895static PyObject *ecmeth_rand(PyObject *me, PyObject *arg, PyObject *kw)
896{
897 char *kwlist[] = { "rng", 0 };
898 grand *r = &rand_global;
899 ec p = EC_INIT;
900
901 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:rand", kwlist,
902 convgrand, &r))
903 return (0);
904 ec_rand(ECCURVE_C(me), &p, r);
905 EC_IN(ECCURVE_C(me), &p, &p);
906 return (ecpt_pywrap(me, &p));
907}
908
909static PyObject *eccurve_dopywrap(PyTypeObject *ty,
910 PyObject *fobj, ec_curve *c)
911{
912 eccurve_pyobj *cobj = newtype(ty, 0);
913 cobj->c = c;
914 cobj->fobj = fobj;
915 cobj->ty.tp_name = (/*unconst*/ char *)c->ops->name;
916 cobj->ty.tp_basicsize = sizeof(ecpt_pyobj);
917 cobj->ty.tp_base = ecptcurve_pytype;
918 Py_INCREF(ecptcurve_pytype);
919 cobj->ty.tp_flags = (Py_TPFLAGS_DEFAULT |
920 Py_TPFLAGS_BASETYPE |
921 Py_TPFLAGS_CHECKTYPES |
922 Py_TPFLAGS_HEAPTYPE);
923 cobj->ty.tp_alloc = PyType_GenericAlloc;
924 cobj->ty.tp_free =_PyObject_Del;
925 cobj->ty.tp_new = ecpt_pynew;
926 PyType_Ready(&cobj->ty);
927 return ((PyObject *)cobj);
928}
929
930PyObject *eccurve_pywrap(PyObject *fobj, ec_curve *c)
931{
932 PyTypeObject *ty;
933
934 if (!fobj)
935 fobj = field_pywrap(c->f);
936 else
937 Py_INCREF(fobj);
938 assert(FIELD_F(fobj) == c->f);
939 if (strcmp(EC_NAME(c), "prime") == 0)
940 ty = ecprimecurve_pytype;
941 else if (strcmp(EC_NAME(c), "primeproj") == 0)
942 ty = ecprimeprojcurve_pytype;
943 else if (strcmp(EC_NAME(c), "bin") == 0)
944 ty = ecbincurve_pytype;
945 else if (strcmp(EC_NAME(c), "binproj") == 0)
946 ty = ecbinprojcurve_pytype;
947 else
948 abort();
949 return (eccurve_dopywrap(ty, fobj, c));
950}
951
952static PyObject *eccurve_pynew(PyTypeObject *ty,
953 ec_curve *(*make)(field *, mp *, mp *),
954 PyObject *arg, PyObject *kw)
955{
956 PyObject *fobj;
957 PyObject *cobj = 0;
958 char *kwlist[] = { "field", "a", "b", 0 };
959 mp *aa = 0, *bb = 0;
960
961 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!OO", kwlist,
962 field_pytype, &fobj,
963 convmp, &aa, convmp, &bb))
964 goto end;
965 Py_INCREF(fobj);
966 cobj = eccurve_dopywrap(ty, fobj, make(FIELD_F(fobj), aa, bb));
967end:
968 if (aa) MP_DROP(aa);
969 if (bb) MP_DROP(bb);
970 return (cobj);
971}
972
973static PyObject *meth__ECCurve_parse(PyObject *me, PyObject *arg)
974{
975 char *p;
976 qd_parse qd;
977 ec_curve *c;
978 PyObject *rc = 0;
979
980 if (!PyArg_ParseTuple(arg, "Os", &me, &p))
981 goto end;
982 qd.p = p;
983 qd.e = 0;
984 if ((c = ec_curveparse(&qd)) == 0)
985 SYNERR(qd.e);
986 rc = eccurve_pywrap(0, c);
987end:
988 return (rc);
989}
990
991static PyObject *ecget_name(PyObject *me, void *hunoz)
992 { return (PyString_FromString(EC_NAME(ECCURVE_C(me)))); }
993
994static PyObject *ecget_a(PyObject *me, void *hunoz)
995 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->a))); }
996
997static PyObject *ecget_b(PyObject *me, void *hunoz)
998 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->b))); }
999
1000static PyObject *ecget_field(PyObject *me, void *hunoz)
1001 { RETURN_OBJ(ECCURVE_FOBJ(me)); }
1002
1003static PyObject *ecget_inf(PyObject *me, void *hunoz)
1004 { ec inf = EC_INIT; return (ecpt_pywrap(me, &inf)); }
1005
1006static PyGetSetDef eccurve_pygetset[] = {
1007#define GETSETNAME(op, name) ec##op##_##name
1008 GET (name, "E.name -> name of this kind of curve")
1009 GET (a, "E.a -> first parameter of curve")
1010 GET (b, "E.b -> second parameter of curve")
1011 GET (field, "E.field -> finite field containing this curve")
1012 GET (inf, "E.inf -> point at infinity of this curve")
1013#undef GETSETNAME
1014 { 0 }
1015};
1016
1017static PyMethodDef eccurve_pymethods[] = {
1018#define METHNAME(name) ecmeth_##name
1019 METH (mmul, "\
1020E.mmul([(P0, N0), (P1, N1), ...]) = N0 P0 + N1 P1 + ...")
1021 METH (find, "E.find(X) -> P")
1022 KWMETH(rand, "E.rand(rng = rand) ->P")
1023#undef METHNAME
1024 { 0 }
1025};
1026
1027static PyTypeObject eccurve_pytype_skel = {
1028 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
1029 "catacomb.ECCurve", /* @tp_name@ */
1030 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1031 0, /* @tp_itemsize@ */
1032
1033 eccurve_pydealloc, /* @tp_dealloc@ */
1034 0, /* @tp_print@ */
1035 0, /* @tp_getattr@ */
1036 0, /* @tp_setattr@ */
1037 0, /* @tp_compare@ */
1038 0, /* @tp_repr@ */
1039 0, /* @tp_as_number@ */
1040 0, /* @tp_as_sequence@ */
1041 0, /* @tp_as_mapping@ */
1042 0, /* @tp_hash@ */
1043 0, /* @tp_call@ */
1044 0, /* @tp_str@ */
1045 0, /* @tp_getattro@ */
1046 0, /* @tp_setattro@ */
1047 0, /* @tp_as_buffer@ */
1048 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1049 Py_TPFLAGS_BASETYPE,
1050
1051 /* @tp_doc@ */
1052 "An elliptic curve. Abstract class.",
1053
1054 0, /* @tp_traverse@ */
1055 0, /* @tp_clear@ */
1056 eccurve_pyrichcompare, /* @tp_richcompare@ */
1057 0, /* @tp_weaklistoffset@ */
1058 0, /* @tp_iter@ */
1059 0, /* @tp_iternexr@ */
1060 eccurve_pymethods, /* @tp_methods@ */
1061 0, /* @tp_members@ */
1062 eccurve_pygetset, /* @tp_getset@ */
1063 0, /* @tp_base@ */
1064 0, /* @tp_dict@ */
1065 0, /* @tp_descr_get@ */
1066 0, /* @tp_descr_set@ */
1067 0, /* @tp_dictoffset@ */
1068 0, /* @tp_init@ */
1069 PyType_GenericAlloc, /* @tp_alloc@ */
1070 abstract_pynew, /* @tp_new@ */
1071 _PyObject_Del, /* @tp_free@ */
1072 0 /* @tp_is_gc@ */
1073};
1074
1075static PyObject *ecprimecurve_pynew(PyTypeObject *ty,
1076 PyObject *arg, PyObject *kw)
1077{
1078 return (eccurve_pynew(ty, ec_prime, arg, kw));
1079}
1080
1081static PyTypeObject ecprimecurve_pytype_skel = {
1082 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
1083 "catacomb.ECPrimeCurve", /* @tp_name@ */
1084 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1085 0, /* @tp_itemsize@ */
1086
1087 eccurve_pydealloc, /* @tp_dealloc@ */
1088 0, /* @tp_print@ */
1089 0, /* @tp_getattr@ */
1090 0, /* @tp_setattr@ */
1091 0, /* @tp_compare@ */
1092 0, /* @tp_repr@ */
1093 0, /* @tp_as_number@ */
1094 0, /* @tp_as_sequence@ */
1095 0, /* @tp_as_mapping@ */
1096 0, /* @tp_hash@ */
1097 0, /* @tp_call@ */
1098 0, /* @tp_str@ */
1099 0, /* @tp_getattro@ */
1100 0, /* @tp_setattro@ */
1101 0, /* @tp_as_buffer@ */
1102 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1103 Py_TPFLAGS_BASETYPE,
1104
1105 /* @tp_doc@ */
1106 "An elliptic curve over a prime field. Use ecprimeprojcurve.",
1107
1108 0, /* @tp_traverse@ */
1109 0, /* @tp_clear@ */
1110 eccurve_pyrichcompare, /* @tp_richcompare@ */
1111 0, /* @tp_weaklistoffset@ */
1112 0, /* @tp_iter@ */
1113 0, /* @tp_iternexr@ */
1114 0, /* @tp_methods@ */
1115 0, /* @tp_members@ */
1116 0, /* @tp_getset@ */
1117 0, /* @tp_base@ */
1118 0, /* @tp_dict@ */
1119 0, /* @tp_descr_get@ */
1120 0, /* @tp_descr_set@ */
1121 0, /* @tp_dictoffset@ */
1122 0, /* @tp_init@ */
1123 PyType_GenericAlloc, /* @tp_alloc@ */
1124 ecprimecurve_pynew, /* @tp_new@ */
1125 _PyObject_Del, /* @tp_free@ */
1126 0 /* @tp_is_gc@ */
1127};
1128
1129static PyObject *ecprimeprojcurve_pynew(PyTypeObject *ty,
1130 PyObject *arg, PyObject *kw)
1131{
1132 return (eccurve_pynew(ty, ec_primeproj, arg, kw));
1133}
1134
1135static PyTypeObject ecprimeprojcurve_pytype_skel = {
1136 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
1137 "catacomb.ECPrimeProjCurve", /* @tp_name@ */
1138 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1139 0, /* @tp_itemsize@ */
1140
1141 eccurve_pydealloc, /* @tp_dealloc@ */
1142 0, /* @tp_print@ */
1143 0, /* @tp_getattr@ */
1144 0, /* @tp_setattr@ */
1145 0, /* @tp_compare@ */
1146 0, /* @tp_repr@ */
1147 0, /* @tp_as_number@ */
1148 0, /* @tp_as_sequence@ */
1149 0, /* @tp_as_mapping@ */
1150 0, /* @tp_hash@ */
1151 0, /* @tp_call@ */
1152 0, /* @tp_str@ */
1153 0, /* @tp_getattro@ */
1154 0, /* @tp_setattro@ */
1155 0, /* @tp_as_buffer@ */
1156 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1157 Py_TPFLAGS_BASETYPE,
1158
1159 /* @tp_doc@ */
1160 "An elliptic curve over a prime field, using projective coordinates.",
1161
1162 0, /* @tp_traverse@ */
1163 0, /* @tp_clear@ */
1164 eccurve_pyrichcompare, /* @tp_richcompare@ */
1165 0, /* @tp_weaklistoffset@ */
1166 0, /* @tp_iter@ */
1167 0, /* @tp_iternexr@ */
1168 0, /* @tp_methods@ */
1169 0, /* @tp_members@ */
1170 0, /* @tp_getset@ */
1171 0, /* @tp_base@ */
1172 0, /* @tp_dict@ */
1173 0, /* @tp_descr_get@ */
1174 0, /* @tp_descr_set@ */
1175 0, /* @tp_dictoffset@ */
1176 0, /* @tp_init@ */
1177 PyType_GenericAlloc, /* @tp_alloc@ */
1178 ecprimeprojcurve_pynew, /* @tp_new@ */
1179 _PyObject_Del, /* @tp_free@ */
1180 0 /* @tp_is_gc@ */
1181};
1182
1183static PyObject *ecbincurve_pynew(PyTypeObject *ty,
1184 PyObject *arg, PyObject *kw)
1185{
1186 return (eccurve_pynew(ty, ec_bin, arg, kw));
1187}
1188
1189static PyTypeObject ecbincurve_pytype_skel = {
1190 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
1191 "catacomb.ECBinCurve", /* @tp_name@ */
1192 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1193 0, /* @tp_itemsize@ */
1194
1195 eccurve_pydealloc, /* @tp_dealloc@ */
1196 0, /* @tp_print@ */
1197 0, /* @tp_getattr@ */
1198 0, /* @tp_setattr@ */
1199 0, /* @tp_compare@ */
1200 0, /* @tp_repr@ */
1201 0, /* @tp_as_number@ */
1202 0, /* @tp_as_sequence@ */
1203 0, /* @tp_as_mapping@ */
1204 0, /* @tp_hash@ */
1205 0, /* @tp_call@ */
1206 0, /* @tp_str@ */
1207 0, /* @tp_getattro@ */
1208 0, /* @tp_setattro@ */
1209 0, /* @tp_as_buffer@ */
1210 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1211 Py_TPFLAGS_BASETYPE,
1212
1213 /* @tp_doc@ */
1214 "An elliptic curve over a binary field. Use ecbinprojcurve.",
1215
1216 0, /* @tp_traverse@ */
1217 0, /* @tp_clear@ */
1218 eccurve_pyrichcompare, /* @tp_richcompare@ */
1219 0, /* @tp_weaklistoffset@ */
1220 0, /* @tp_iter@ */
1221 0, /* @tp_iternexr@ */
1222 0, /* @tp_methods@ */
1223 0, /* @tp_members@ */
1224 0, /* @tp_getset@ */
1225 0, /* @tp_base@ */
1226 0, /* @tp_dict@ */
1227 0, /* @tp_descr_get@ */
1228 0, /* @tp_descr_set@ */
1229 0, /* @tp_dictoffset@ */
1230 0, /* @tp_init@ */
1231 PyType_GenericAlloc, /* @tp_alloc@ */
1232 ecbincurve_pynew, /* @tp_new@ */
1233 _PyObject_Del, /* @tp_free@ */
1234 0 /* @tp_is_gc@ */
1235};
1236
1237static PyObject *ecbinprojcurve_pynew(PyTypeObject *ty,
1238 PyObject *arg, PyObject *kw)
1239{
1240 return (eccurve_pynew(ty, ec_binproj, arg, kw));
1241}
1242
1243static PyTypeObject ecbinprojcurve_pytype_skel = {
1244 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
1245 "catacomb.ECBinProjCurve", /* @tp_name@ */
1246 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1247 0, /* @tp_itemsize@ */
1248
1249 eccurve_pydealloc, /* @tp_dealloc@ */
1250 0, /* @tp_print@ */
1251 0, /* @tp_getattr@ */
1252 0, /* @tp_setattr@ */
1253 0, /* @tp_compare@ */
1254 0, /* @tp_repr@ */
1255 0, /* @tp_as_number@ */
1256 0, /* @tp_as_sequence@ */
1257 0, /* @tp_as_mapping@ */
1258 0, /* @tp_hash@ */
1259 0, /* @tp_call@ */
1260 0, /* @tp_str@ */
1261 0, /* @tp_getattro@ */
1262 0, /* @tp_setattro@ */
1263 0, /* @tp_as_buffer@ */
1264 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1265 Py_TPFLAGS_BASETYPE,
1266
1267 /* @tp_doc@ */
1268 "An elliptic curve over a binary field, using projective coordinates.",
1269
1270 0, /* @tp_traverse@ */
1271 0, /* @tp_clear@ */
1272 eccurve_pyrichcompare, /* @tp_richcompare@ */
1273 0, /* @tp_weaklistoffset@ */
1274 0, /* @tp_iter@ */
1275 0, /* @tp_iternexr@ */
1276 0, /* @tp_methods@ */
1277 0, /* @tp_members@ */
1278 0, /* @tp_getset@ */
1279 0, /* @tp_base@ */
1280 0, /* @tp_dict@ */
1281 0, /* @tp_descr_get@ */
1282 0, /* @tp_descr_set@ */
1283 0, /* @tp_dictoffset@ */
1284 0, /* @tp_init@ */
1285 PyType_GenericAlloc, /* @tp_alloc@ */
1286 ecbinprojcurve_pynew, /* @tp_new@ */
1287 _PyObject_Del, /* @tp_free@ */
1288 0 /* @tp_is_gc@ */
1289};
1290
1291/*----- Curve info --------------------------------------------------------*/
1292
1293static int ncurves = -1;
1294
1295void ecinfo_copy(ec_info *eic, const ec_info *ei)
1296{
1297 eic->c = eccurve_copy(ei->c);
1298 EC_CREATE(&eic->g);
1299 EC_COPY(&eic->g, &ei->g);
1300 eic->r = MP_COPY(ei->r);
1301 eic->h = MP_COPY(ei->h);
1302}
1303
1304PyObject *ecinfo_pywrap(ec_info *ei)
1305{
1306 ecinfo_pyobj *o;
1307
1308 o = PyObject_NEW(ecinfo_pyobj, ecinfo_pytype);
1309 o->ei = *ei;
1310 o->cobj = eccurve_pywrap(0, o->ei.c);
1311 Py_INCREF(o->cobj);
1312 return ((PyObject *)o);
1313}
1314
1315static void ecinfo_pydealloc(PyObject *me)
1316{
1317 ec_info *ei = ECINFO_EI(me);
1318 EC_DESTROY(&ei->g);
1319 MP_DROP(ei->r);
1320 MP_DROP(ei->h);
1321 Py_DECREF(ECINFO_COBJ(me));
1322 PyObject_DEL(me);
1323}
1324
1325static PyObject *ecinfo_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
1326{
1327 ec_info ei = { 0 };
1328 PyObject *e, *g;
1329 char *kwlist[] = { "curve", "G", "r", "h", 0 };
1330 ecinfo_pyobj *rc = 0;
1331
1332 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O!O&O&:new", kwlist,
1333 eccurve_pytype, &e, ecpt_pytype, &g,
1334 convmp, &ei.r, convmp, &ei.h))
1335 goto end;
1336 if (ECPT_C(g) != ECCURVE_C(e) && !ec_samep(ECPT_C(g), ECCURVE_C(e)))
1337 TYERR("point not from this curve");
1338 ei.c = ECCURVE_C(e);
1339 EC_CREATE(&ei.g);
1340 EC_COPY(&ei.g, ECPT_P(g));
1341 rc = (ecinfo_pyobj *)ty->tp_alloc(ty, 0);
1342 rc->ei = ei;
1343 rc->cobj = e;
1344 Py_INCREF(rc->cobj);
1345 return ((PyObject *)rc);
1346
1347end:
1348 mp_drop(ei.r);
1349 mp_drop(ei.h);
1350 return (0);
1351}
1352
1353static PyObject *meth__ECInfo_parse(PyObject *me, PyObject *arg)
1354{
1355 char *p;
1356 qd_parse qd;
1357 ec_info ei;
1358 PyObject *rc = 0;
1359
1360 if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p))
1361 goto end;
1362 qd.p = p;
1363 qd.e = 0;
1364 if (ec_infoparse(&qd, &ei))
1365 SYNERR(qd.e);
1366 rc = Py_BuildValue("(Ns)", ecinfo_pywrap(&ei), qd.p);
1367end:
1368 return (rc);
1369}
1370
1371static PyObject *meth__ECInfo__curven(PyObject *me, PyObject *arg)
1372{
1373 int i;
1374 ec_info ei;
1375 PyObject *rc = 0;
1376
1377 if (!PyArg_ParseTuple(arg, "Oi:_curven", &me, &i)) goto end;
1378 if (i < 0 || i >= ncurves) VALERR("curve index out of range");
1379 ec_infofromdata(&ei, ectab[i].data);
1380 rc = ecinfo_pywrap(&ei);
1381end:
1382 return (rc);
1383}
1384
1385static PyObject *ecinfo_pyrichcompare(PyObject *x, PyObject *y, int op)
1386{
1387 int b = ec_sameinfop(ECINFO_EI(x), ECINFO_EI(y));
1388 switch (op) {
1389 case Py_EQ: break;
1390 case Py_NE: b = !b;
1391 default: TYERR("can't order elliptic curve infos");
1392 }
1393 return (getbool(b));
1394end:
1395 return (0);
1396}
1397
1398static PyObject *eimeth_check(PyObject *me, PyObject *arg, PyObject *kw)
1399{
1400 char *kwlist[] = { "rng", 0 };
1401 grand *r = &rand_global;
1402 const char *p;
1403
1404 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:check", kwlist,
1405 convgrand, &r))
1406 goto end;
1407 if ((p = ec_checkinfo(ECINFO_EI(me), r)) != 0)
1408 VALERR(p);
1409 RETURN_ME;
1410end:
1411 return (0);
1412}
1413
1414static PyObject *eiget_curve(PyObject *me, void *hunoz)
1415 { RETURN_OBJ(ECINFO_COBJ(me)); }
1416
1417static PyObject *eiget_G(PyObject *me, void *hunoz)
1418{
1419 ec_info *ei = ECINFO_EI(me);
1420 ec p = EC_INIT;
1421 EC_IN(ei->c, &p, &ei->g);
1422 return (ecpt_pywrap(ECINFO_COBJ(me), &p));
1423}
1424
1425static PyObject *eiget_r(PyObject *me, void *hunoz)
1426 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->r))); }
1427
1428static PyObject *eiget_h(PyObject *me, void *hunoz)
1429 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->h))); }
1430
1431static PyGetSetDef ecinfo_pygetset[] = {
1432#define GETSETNAME(op, name) ei##op##_##name
1433 GET (curve, "I.curve -> the elliptic curve")
1434 GET (G, "I.G -> generator point for the group")
1435 GET (r, "I.r -> order of the group (and hence of G")
1436 GET (h, "I.h -> cofactor of the group")
1437#undef GETSETNAME
1438 { 0 }
1439};
1440
1441static PyMethodDef ecinfo_pymethods[] = {
1442#define METHNAME(name) eimeth_##name
1443 KWMETH(check, "I.check() -> None")
1444#undef METHNAME
1445 { 0 }
1446};
1447
1448static PyTypeObject ecinfo_pytype_skel = {
1449 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
1450 "catacomb.ECInfo", /* @tp_name@ */
1451 sizeof(ecinfo_pyobj), /* @tp_basicsize@ */
1452 0, /* @tp_itemsize@ */
1453
1454 ecinfo_pydealloc, /* @tp_dealloc@ */
1455 0, /* @tp_print@ */
1456 0, /* @tp_getattr@ */
1457 0, /* @tp_setattr@ */
1458 0, /* @tp_compare@ */
1459 0, /* @tp_repr@ */
1460 0, /* @tp_as_number@ */
1461 0, /* @tp_as_sequence@ */
1462 0, /* @tp_as_mapping@ */
1463 0, /* @tp_hash@ */
1464 0, /* @tp_call@ */
1465 0, /* @tp_str@ */
1466 0, /* @tp_getattro@ */
1467 0, /* @tp_setattro@ */
1468 0, /* @tp_as_buffer@ */
1469 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1470 Py_TPFLAGS_BASETYPE,
1471
1472 /* @tp_doc@ */
1473 "Elliptic curve domain parameters.",
1474
1475 0, /* @tp_traverse@ */
1476 0, /* @tp_clear@ */
1477 ecinfo_pyrichcompare, /* @tp_richcompare@ */
1478 0, /* @tp_weaklistoffset@ */
1479 0, /* @tp_iter@ */
1480 0, /* @tp_iternexr@ */
1481 ecinfo_pymethods, /* @tp_methods@ */
1482 0, /* @tp_members@ */
1483 ecinfo_pygetset, /* @tp_getset@ */
1484 0, /* @tp_base@ */
1485 0, /* @tp_dict@ */
1486 0, /* @tp_descr_get@ */
1487 0, /* @tp_descr_set@ */
1488 0, /* @tp_dictoffset@ */
1489 0, /* @tp_init@ */
1490 PyType_GenericAlloc, /* @tp_alloc@ */
1491 ecinfo_pynew, /* @tp_new@ */
1492 _PyObject_Del, /* @tp_free@ */
1493 0 /* @tp_is_gc@ */
1494};
1495
1496/*----- Setup -------------------------------------------------------------*/
1497
1498static PyMethodDef methods[] = {
1499#define METHNAME(func) meth_##func
1500 METH (_ECPt_frombuf, "frombuf(E, STR) -> (P, REST)")
1501 METH (_ECPtCurve_fromraw, "fromraw(E, STR) -> (P, REST)")
1502 METH (_ECPt_parse, "parse(E, STR) -> (P, REST)")
1503 METH (_ECCurve_parse, "parse(STR) -> (E, REST)")
1504 METH (_ECInfo_parse, "parse(STR) -> (I, REST)")
1505 METH (_ECInfo__curven, "_curven(N) -> I")
1506#undef METHNAME
1507 { 0 }
1508};
1509
1510void ec_pyinit(void)
1511{
1512 INITTYPE(ecpt, root);
1513 INITTYPE(ecptcurve, ecpt);
1514 INITTYPE(eccurve, type);
1515 INITTYPE(ecprimecurve, eccurve);
1516 INITTYPE(ecprimeprojcurve, ecprimecurve);
1517 INITTYPE(ecbincurve, eccurve);
1518 INITTYPE(ecbinprojcurve, ecbincurve);
1519 INITTYPE(ecinfo, root);
1520 addmethods(methods);
1521}
1522
1523static PyObject *namedcurves(void)
1524{
1525 int i, j;
1526 const char *p;
1527 PyObject *d, *c;
1528
1529 d = PyDict_New();
1530 for (i = 0; ectab[i].name; i++) {
1531 p = ectab[i].name;
1532 for (j = 0; j < i; j++) {
1533 if (ectab[i].data == ectab[j].data) {
1534 c = PyDict_GetItemString(d, (/*unconst*/ char *)ectab[j].name);
1535 Py_INCREF(c);
1536 goto found;
1537 }
1538 }
1539 c = PyInt_FromLong(i);
1540 found:
1541 PyDict_SetItemString(d, (/*unconst*/ char *)ectab[i].name, c);
1542 Py_DECREF(c);
1543 }
1544 ncurves = i;
1545 return (d);
1546}
1547
1548void ec_pyinsert(PyObject *mod)
1549{
1550 INSERT("ECPt", ecpt_pytype);
1551 INSERT("ECPtCurve", ecptcurve_pytype);
1552 INSERT("ECCurve", eccurve_pytype);
1553 INSERT("ECPrimeCurve", ecprimecurve_pytype);
1554 INSERT("ECPrimeProjCurve", ecprimeprojcurve_pytype);
1555 INSERT("ECBinCurve", ecbincurve_pytype);
1556 INSERT("ECBinProjCurve", ecbinprojcurve_pytype);
1557 INSERT("ECInfo", ecinfo_pytype);
1558 INSERT("_eccurves", namedcurves());
1559}
1560
1561/*----- That's all, folks -------------------------------------------------*/
Catacomb cryptographic library -- Python bindings