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[catacomb-python] / ec.c
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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));
3aa33042 182 FREEOBJ(x);
d7ab1bab 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
d7ab1bab 475static PyObject *ecptnc_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
476{
477 PyObject *x = 0, *y = 0, *z = 0;
478 ec p = EC_INIT;
479 char *kwlist[] = { "x", "y", 0 };
480
481 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OO:new", kwlist, &x, &y) ||
482 ecptxl(0, &p, x, y, z))
483 goto end;
484 return (ecpt_pywrapout(ty, &p));
485end:
486 EC_DESTROY(&p);
487 return (0);
488}
489
490static PyObject *ecpt_pyint(PyObject *me)
491{
492 ec p = EC_INIT;
493 long l;
494 PyObject *rc = 0;
495 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
496 getecptout(&p, me);
497 if (mp_tolong_checked(p.x, &l)) goto end;
498 rc = PyInt_FromLong(l);
499end:
500 EC_DESTROY(&p);
501 return (rc);
502}
503
504static PyObject *ecpt_pylong(PyObject *me)
505{
506 ec p = EC_INIT;
507 PyObject *rc = 0;
508 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
509 getecptout(&p, me);
510 rc = (PyObject *)mp_topylong(p.x);
511end:
512 EC_DESTROY(&p);
513 return (rc);
514}
515
516static PyObject *ecpt_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
517{
518 PyObject *x = 0, *y = 0, *z = 0;
519 ec p = EC_INIT;
520 char *kwlist[] = { "x", "y", "z", 0 };
521
522 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OOO:new", kwlist,
523 &x, &y, &z) ||
524 ecptxl(ECCURVE_C(ty), &p, x, y, z))
525 goto end;
526 return (ecpt_pywrap((PyObject *)ty, &p));
527end:
528 EC_DESTROY(&p);
529 return (0);
530}
531
532static PyGetSetDef ecptnc_pygetset[] = {
533#define GETSETNAME(op, name) epnc##op##_##name
534 GET (ix, "P.ix -> integer x coordinate of P")
535 GET (iy, "P.iy -> integer y coordinate of P")
536 GET (point, "P.point -> standalone curve point (no-op)")
537#undef GETSETNAME
538 { 0 }
539};
540
541static PyMethodDef ecptnc_pymethods[] = {
542#define METHNAME(func) epmeth_##func
543 METH (tobuf, "X.tobuf() -> BIN")
544#undef METHNAME
545 { 0 }
546};
547
548static PyNumberMethods ecpt_pynumber = {
549 0, /* @nb_add@ */
550 0, /* @nb_subtract@ */
551 0, /* @nb_multiply@ */
552 0, /* @nb_divide@ */
553 0, /* @nb_remainder@ */
554 0, /* @nb_divmod@ */
555 0, /* @nb_power@ */
556 0, /* @nb_negative@ */
557 0, /* @nb_positive@ */
558 0, /* @nb_absolute@ */
559 ecpt_pynonzerop, /* @nb_nonzero@ */
560 0, /* @nb_invert@ */
561 0, /* @nb_lshift@ */
562 0, /* @nb_rshift@ */
563 0, /* @nb_and@ */
564 0, /* @nb_xor@ */
565 0, /* @nb_or@ */
566 0, /* @nb_coerce@ */
567 ecpt_pyint, /* @nb_int@ */
568 ecpt_pylong, /* @nb_long@ */
569 0, /* @nb_float@ */
570 0, /* @nb_oct@ */
571 0, /* @nb_hex@ */
572
573 0, /* @nb_inplace_add@ */
574 0, /* @nb_inplace_subtract@ */
575 0, /* @nb_inplace_multiply@ */
576 0, /* @nb_inplace_divide@ */
577 0, /* @nb_inplace_remainder@ */
578 0, /* @nb_inplace_power@ */
579 0, /* @nb_inplace_lshift@ */
580 0, /* @nb_inplace_rshift@ */
581 0, /* @nb_inplace_and@ */
582 0, /* @nb_inplace_xor@ */
583 0, /* @nb_inplace_or@ */
584
585 0, /* @nb_floor_divide@ */
586 0, /* @nb_true_divide@ */
587 0, /* @nb_inplace_floor_divide@ */
588 0, /* @nb_inplace_true_divide@ */
589};
590
591static PyTypeObject ecpt_pytype_skel = {
592 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
593 "catacomb.ECPt", /* @tp_name@ */
594 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
595 0, /* @tp_itemsize@ */
596
597 ecpt_pydealloc, /* @tp_dealloc@ */
598 0, /* @tp_print@ */
599 0, /* @tp_getattr@ */
600 0, /* @tp_setattr@ */
601 0, /* @tp_compare@ */
602 0, /* @tp_repr@ */
603 &ecpt_pynumber, /* @tp_as_number@ */
604 0, /* @tp_as_sequence@ */
605 0, /* @tp_as_mapping@ */
606 ecpt_pyhash, /* @tp_hash@ */
607 0, /* @tp_call@ */
608 0, /* @tp_str@ */
609 0, /* @tp_getattro@ */
610 0, /* @tp_setattro@ */
611 0, /* @tp_as_buffer@ */
612 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
613 Py_TPFLAGS_CHECKTYPES |
614 Py_TPFLAGS_BASETYPE,
615
616 /* @tp_doc@ */
617"Elliptic curve points, not associated with any curve.",
618
619 0, /* @tp_traverse@ */
620 0, /* @tp_clear@ */
621 ecpt_pyrichcompare, /* @tp_richcompare@ */
622 0, /* @tp_weaklistoffset@ */
623 0, /* @tp_iter@ */
624 0, /* @tp_iternexr@ */
625 ecptnc_pymethods, /* @tp_methods@ */
626 0, /* @tp_members@ */
627 ecptnc_pygetset, /* @tp_getset@ */
628 0, /* @tp_base@ */
629 0, /* @tp_dict@ */
630 0, /* @tp_descr_get@ */
631 0, /* @tp_descr_set@ */
632 0, /* @tp_dictoffset@ */
633 0, /* @tp_init@ */
634 PyType_GenericAlloc, /* @tp_alloc@ */
635 ecptnc_pynew, /* @tp_new@ */
3aa33042 636 0, /* @tp_free@ */
d7ab1bab 637 0 /* @tp_is_gc@ */
638};
639
640static PyGetSetDef ecpt_pygetset[] = {
641#define GETSETNAME(op, name) ep##op##_##name
642 GET (curve, "P.curve -> elliptic curve containing P")
643 GET (point, "P.point -> standalone curve point")
644 GET (x, "P.x -> Cartesian x coordinate of P")
645 GET (y, "P.y -> Cartesian y coordinate of P")
646 GET (_x, "P._x -> internal x coordinate of P")
647 GET (_y, "P._y -> internal y coordinate of P")
648 GET (_z, "P._z -> internal z coordinate of P, or None")
649#undef GETSETNAME
650 { 0 }
651};
652
653static PyMethodDef ecpt_pymethods[] = {
654#define METHNAME(func) epmeth_##func
655 METH (toraw, "X.toraw() -> BIN")
656 METH (dbl, "X.dbl() -> X + X")
3aa33042 657 METH (oncurvep, "X.oncurvep() -> BOOL")
d7ab1bab 658#undef METHNAME
659 { 0 }
660};
661
662static PyNumberMethods ecptcurve_pynumber = {
663 ecpt_pyadd, /* @nb_add@ */
664 ecpt_pysub, /* @nb_subtract@ */
665 ecpt_pymul, /* @nb_multiply@ */
666 0, /* @nb_divide@ */
667 0, /* @nb_remainder@ */
668 0, /* @nb_divmod@ */
669 0, /* @nb_power@ */
670 ecpt_pyneg, /* @nb_negative@ */
671 ecpt_pyid, /* @nb_positive@ */
672 0, /* @nb_absolute@ */
673 0, /* @nb_nonzero@ */
674 0, /* @nb_invert@ */
675 0, /* @nb_lshift@ */
676 0, /* @nb_rshift@ */
677 0, /* @nb_and@ */
678 0, /* @nb_xor@ */
679 0, /* @nb_or@ */
680 0, /* @nb_coerce@ */
681 0, /* @nb_int@ */
682 0, /* @nb_long@ */
683 0, /* @nb_float@ */
684 0, /* @nb_oct@ */
685 0, /* @nb_hex@ */
686
687 0, /* @nb_inplace_add@ */
688 0, /* @nb_inplace_subtract@ */
689 0, /* @nb_inplace_multiply@ */
690 0, /* @nb_inplace_divide@ */
691 0, /* @nb_inplace_remainder@ */
692 0, /* @nb_inplace_power@ */
693 0, /* @nb_inplace_lshift@ */
694 0, /* @nb_inplace_rshift@ */
695 0, /* @nb_inplace_and@ */
696 0, /* @nb_inplace_xor@ */
697 0, /* @nb_inplace_or@ */
698
699 0, /* @nb_floor_divide@ */
700 0, /* @nb_true_divide@ */
701 0, /* @nb_inplace_floor_divide@ */
702 0, /* @nb_inplace_true_divide@ */
703};
704
705static PyTypeObject ecptcurve_pytype_skel = {
706 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
707 "catacomb.ECPtCurve", /* @tp_name@ */
708 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
709 0, /* @tp_itemsize@ */
710
711 ecpt_pydealloc, /* @tp_dealloc@ */
712 0, /* @tp_print@ */
713 0, /* @tp_getattr@ */
714 0, /* @tp_setattr@ */
715 0, /* @tp_compare@ */
716 0, /* @tp_repr@ */
717 &ecptcurve_pynumber, /* @tp_as_number@ */
718 0, /* @tp_as_sequence@ */
719 0, /* @tp_as_mapping@ */
720 0, /* @tp_hash@ */
721 0, /* @tp_call@ */
722 0, /* @tp_str@ */
723 0, /* @tp_getattro@ */
724 0, /* @tp_setattro@ */
725 0, /* @tp_as_buffer@ */
726 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
727 Py_TPFLAGS_CHECKTYPES |
728 Py_TPFLAGS_BASETYPE,
729
730 /* @tp_doc@ */
731"Elliptic curve points; abstract base class for points on given curves.",
732
733 0, /* @tp_traverse@ */
734 0, /* @tp_clear@ */
735 0, /* @tp_richcompare@ */
736 0, /* @tp_weaklistoffset@ */
737 0, /* @tp_iter@ */
738 0, /* @tp_iternexr@ */
739 ecpt_pymethods, /* @tp_methods@ */
740 0, /* @tp_members@ */
741 ecpt_pygetset, /* @tp_getset@ */
742 0, /* @tp_base@ */
743 0, /* @tp_dict@ */
744 0, /* @tp_descr_get@ */
745 0, /* @tp_descr_set@ */
746 0, /* @tp_dictoffset@ */
747 0, /* @tp_init@ */
748 PyType_GenericAlloc, /* @tp_alloc@ */
749 abstract_pynew, /* @tp_new@ */
3aa33042 750 0, /* @tp_free@ */
d7ab1bab 751 0 /* @tp_is_gc@ */
752};
753
754/*----- Elliptic curves themselves ----------------------------------------*/
755
756static PyObject *eccurve_pyrichcompare(PyObject *x, PyObject *y, int op)
757{
758 int b = ec_samep(ECCURVE_C(x), ECCURVE_C(y));
759 switch (op) {
760 case Py_EQ: break;
761 case Py_NE: b = !b;
762 default: TYERR("can't order elliptic curves");
763 }
764 return (getbool(b));
765end:
766 return (0);
767}
768
769static PyObject *ecmmul_id(PyObject *me)
770 { ec p = EC_INIT; return (ecpt_pywrap(me, &p)); }
771
772static int ecmmul_fill(void *pp, PyObject *me, PyObject *x, PyObject *m)
773{
774 ec_mulfactor *f = pp;
775
776 if (getecpt(ECCURVE_C(me), &f->base, x) ||
777 (f->exp = getmp(m)) == 0)
778 return (-1);
779 f->base = *ECPT_P(x);
780 return (0);
781}
782
783static PyObject *ecmmul_exp(PyObject *me, void *pp, int n)
784{
785 ec p = EC_INIT;
786 ec_immul(ECCURVE_C(me), &p, pp, n);
787 return (ecpt_pywrap(me, &p));
788}
789
790static void ecmmul_drop(void *pp)
791{
792 ec_mulfactor *f = pp;
793 EC_DESTROY(&f->base);
794 MP_DROP(f->exp);
795}
796
797static PyObject *ecmeth_mmul(PyObject *me, PyObject *arg)
798{
799 return (mexp_common(me, arg, sizeof(ec_mulfactor),
800 ecmmul_id, ecmmul_fill, ecmmul_exp, ecmmul_drop));
801}
802
803static PyObject *meth__ECPtCurve_fromraw(PyObject *me, PyObject *arg)
804{
805 char *p;
806 int len;
807 buf b;
808 PyObject *rc = 0;
809 ec_curve *cc;
810 ec pp = EC_INIT;
811
812 if (!PyArg_ParseTuple(arg, "Os#:fromraw", &me, &p, &len))
813 return (0);
814 buf_init(&b, p, len);
815 cc = ECCURVE_C(me);
816 if (ec_getraw(cc, &b, &pp))
817 SYNERR("bad point");
818 EC_IN(cc, &pp, &pp);
819 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
820end:
821 return (rc);
822}
823
824static PyObject *meth__ECPt_frombuf(PyObject *me, PyObject *arg)
825{
826 buf b;
827 char *p;
828 int sz;
829 PyObject *rc = 0;
830 ec pp = EC_INIT;
831
832 if (!PyArg_ParseTuple(arg, "Os#:frombuf", &me, &p, &sz)) goto end;
833 buf_init(&b, p, sz);
834 if (buf_getec(&b, &pp)) VALERR("malformed data");
835 rc = Py_BuildValue("(NN)", ecpt_pywrapout(me, &pp),
836 bytestring_pywrapbuf(&b));
837end:
838 return (rc);
839}
840
841static PyObject *meth__ECPt_parse(PyObject *me, PyObject *arg)
842{
843 char *p;
844 qd_parse qd;
845 PyObject *rc = 0;
846 ec pp = EC_INIT;
847
848 if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p)) goto end;
849 qd.p = p;
850 qd.e = 0;
851 if (!ec_ptparse(&qd, &pp)) SYNERR(qd.e);
852 rc = Py_BuildValue("(Ns)", ecpt_pywrapout(me, &pp), qd.p);
853end:
854 return (rc);
855}
856
857static void eccurve_pydealloc(PyObject *me)
858{
859 ec_destroycurve(ECCURVE_C(me));
860 Py_DECREF(ECCURVE_FOBJ(me));
861 PyType_Type.tp_dealloc(me);
862}
863
864static PyObject *ecmeth_find(PyObject *me, PyObject *arg)
865{
866 PyObject *x;
867 mp *xx = 0;
868 ec p = EC_INIT;
869 PyObject *rc = 0;
870
871 if (!PyArg_ParseTuple(arg, "O:find", &x)) goto end;
872 if (FIELD_PYCHECK(x) && FE_F(x) == ECCURVE_C(me)->f)
873 xx = MP_COPY(FE_X(x));
874 else if ((xx = getmp(x)) == 0)
875 goto end;
876 else
877 xx = F_IN(ECCURVE_C(me)->f, xx, xx);
878 if (EC_FIND(ECCURVE_C(me), &p, xx) == 0)
879 VALERR("not on the curve");
880 rc = ecpt_pywrap(me, &p);
881end:
882 if (xx) MP_DROP(xx);
883 return (rc);
884}
885
886static PyObject *ecmeth_rand(PyObject *me, PyObject *arg, PyObject *kw)
887{
888 char *kwlist[] = { "rng", 0 };
889 grand *r = &rand_global;
890 ec p = EC_INIT;
891
892 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:rand", kwlist,
893 convgrand, &r))
894 return (0);
895 ec_rand(ECCURVE_C(me), &p, r);
896 EC_IN(ECCURVE_C(me), &p, &p);
897 return (ecpt_pywrap(me, &p));
898}
899
900static PyObject *eccurve_dopywrap(PyTypeObject *ty,
901 PyObject *fobj, ec_curve *c)
902{
df9f8366 903 eccurve_pyobj *cobj = newtype(ty, 0, c->ops->name);
d7ab1bab 904 cobj->c = c;
905 cobj->fobj = fobj;
df9f8366 906 cobj->ty.type.tp_basicsize = sizeof(ecpt_pyobj);
907 cobj->ty.type.tp_base = ecptcurve_pytype;
d7ab1bab 908 Py_INCREF(ecptcurve_pytype);
df9f8366 909 cobj->ty.type.tp_flags = (Py_TPFLAGS_DEFAULT |
910 Py_TPFLAGS_BASETYPE |
911 Py_TPFLAGS_CHECKTYPES |
912 Py_TPFLAGS_HEAPTYPE);
913 cobj->ty.type.tp_alloc = PyType_GenericAlloc;
914 cobj->ty.type.tp_free = 0;
915 cobj->ty.type.tp_new = ecpt_pynew;
916 PyType_Ready(&cobj->ty.type);
d7ab1bab 917 return ((PyObject *)cobj);
918}
919
920PyObject *eccurve_pywrap(PyObject *fobj, ec_curve *c)
921{
922 PyTypeObject *ty;
923
924 if (!fobj)
925 fobj = field_pywrap(c->f);
926 else
927 Py_INCREF(fobj);
928 assert(FIELD_F(fobj) == c->f);
929 if (strcmp(EC_NAME(c), "prime") == 0)
930 ty = ecprimecurve_pytype;
931 else if (strcmp(EC_NAME(c), "primeproj") == 0)
932 ty = ecprimeprojcurve_pytype;
933 else if (strcmp(EC_NAME(c), "bin") == 0)
934 ty = ecbincurve_pytype;
935 else if (strcmp(EC_NAME(c), "binproj") == 0)
936 ty = ecbinprojcurve_pytype;
937 else
938 abort();
939 return (eccurve_dopywrap(ty, fobj, c));
940}
941
942static PyObject *eccurve_pynew(PyTypeObject *ty,
943 ec_curve *(*make)(field *, mp *, mp *),
944 PyObject *arg, PyObject *kw)
945{
946 PyObject *fobj;
947 PyObject *cobj = 0;
948 char *kwlist[] = { "field", "a", "b", 0 };
949 mp *aa = 0, *bb = 0;
950
951 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!OO", kwlist,
952 field_pytype, &fobj,
953 convmp, &aa, convmp, &bb))
954 goto end;
955 Py_INCREF(fobj);
956 cobj = eccurve_dopywrap(ty, fobj, make(FIELD_F(fobj), aa, bb));
957end:
958 if (aa) MP_DROP(aa);
959 if (bb) MP_DROP(bb);
960 return (cobj);
961}
962
963static PyObject *meth__ECCurve_parse(PyObject *me, PyObject *arg)
964{
965 char *p;
966 qd_parse qd;
967 ec_curve *c;
968 PyObject *rc = 0;
969
970 if (!PyArg_ParseTuple(arg, "Os", &me, &p))
971 goto end;
972 qd.p = p;
973 qd.e = 0;
974 if ((c = ec_curveparse(&qd)) == 0)
975 SYNERR(qd.e);
976 rc = eccurve_pywrap(0, c);
977end:
978 return (rc);
979}
980
981static PyObject *ecget_name(PyObject *me, void *hunoz)
982 { return (PyString_FromString(EC_NAME(ECCURVE_C(me)))); }
983
984static PyObject *ecget_a(PyObject *me, void *hunoz)
985 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->a))); }
986
987static PyObject *ecget_b(PyObject *me, void *hunoz)
988 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->b))); }
989
990static PyObject *ecget_field(PyObject *me, void *hunoz)
991 { RETURN_OBJ(ECCURVE_FOBJ(me)); }
992
993static PyObject *ecget_inf(PyObject *me, void *hunoz)
994 { ec inf = EC_INIT; return (ecpt_pywrap(me, &inf)); }
995
996static PyGetSetDef eccurve_pygetset[] = {
997#define GETSETNAME(op, name) ec##op##_##name
998 GET (name, "E.name -> name of this kind of curve")
999 GET (a, "E.a -> first parameter of curve")
1000 GET (b, "E.b -> second parameter of curve")
1001 GET (field, "E.field -> finite field containing this curve")
1002 GET (inf, "E.inf -> point at infinity of this curve")
1003#undef GETSETNAME
1004 { 0 }
1005};
1006
1007static PyMethodDef eccurve_pymethods[] = {
1008#define METHNAME(name) ecmeth_##name
1009 METH (mmul, "\
1010E.mmul([(P0, N0), (P1, N1), ...]) = N0 P0 + N1 P1 + ...")
1011 METH (find, "E.find(X) -> P")
1012 KWMETH(rand, "E.rand(rng = rand) ->P")
1013#undef METHNAME
1014 { 0 }
1015};
1016
1017static PyTypeObject eccurve_pytype_skel = {
1018 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
1019 "catacomb.ECCurve", /* @tp_name@ */
1020 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1021 0, /* @tp_itemsize@ */
1022
1023 eccurve_pydealloc, /* @tp_dealloc@ */
1024 0, /* @tp_print@ */
1025 0, /* @tp_getattr@ */
1026 0, /* @tp_setattr@ */
1027 0, /* @tp_compare@ */
1028 0, /* @tp_repr@ */
1029 0, /* @tp_as_number@ */
1030 0, /* @tp_as_sequence@ */
1031 0, /* @tp_as_mapping@ */
1032 0, /* @tp_hash@ */
1033 0, /* @tp_call@ */
1034 0, /* @tp_str@ */
1035 0, /* @tp_getattro@ */
1036 0, /* @tp_setattro@ */
1037 0, /* @tp_as_buffer@ */
1038 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1039 Py_TPFLAGS_BASETYPE,
1040
1041 /* @tp_doc@ */
1042 "An elliptic curve. Abstract class.",
1043
1044 0, /* @tp_traverse@ */
1045 0, /* @tp_clear@ */
1046 eccurve_pyrichcompare, /* @tp_richcompare@ */
1047 0, /* @tp_weaklistoffset@ */
1048 0, /* @tp_iter@ */
1049 0, /* @tp_iternexr@ */
1050 eccurve_pymethods, /* @tp_methods@ */
1051 0, /* @tp_members@ */
1052 eccurve_pygetset, /* @tp_getset@ */
1053 0, /* @tp_base@ */
1054 0, /* @tp_dict@ */
1055 0, /* @tp_descr_get@ */
1056 0, /* @tp_descr_set@ */
1057 0, /* @tp_dictoffset@ */
1058 0, /* @tp_init@ */
1059 PyType_GenericAlloc, /* @tp_alloc@ */
1060 abstract_pynew, /* @tp_new@ */
3aa33042 1061 0, /* @tp_free@ */
d7ab1bab 1062 0 /* @tp_is_gc@ */
1063};
1064
1065static PyObject *ecprimecurve_pynew(PyTypeObject *ty,
1066 PyObject *arg, PyObject *kw)
1067{
1068 return (eccurve_pynew(ty, ec_prime, arg, kw));
1069}
1070
1071static PyTypeObject ecprimecurve_pytype_skel = {
1072 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
1073 "catacomb.ECPrimeCurve", /* @tp_name@ */
1074 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1075 0, /* @tp_itemsize@ */
1076
1077 eccurve_pydealloc, /* @tp_dealloc@ */
1078 0, /* @tp_print@ */
1079 0, /* @tp_getattr@ */
1080 0, /* @tp_setattr@ */
1081 0, /* @tp_compare@ */
1082 0, /* @tp_repr@ */
1083 0, /* @tp_as_number@ */
1084 0, /* @tp_as_sequence@ */
1085 0, /* @tp_as_mapping@ */
1086 0, /* @tp_hash@ */
1087 0, /* @tp_call@ */
1088 0, /* @tp_str@ */
1089 0, /* @tp_getattro@ */
1090 0, /* @tp_setattro@ */
1091 0, /* @tp_as_buffer@ */
1092 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1093 Py_TPFLAGS_BASETYPE,
1094
1095 /* @tp_doc@ */
1096 "An elliptic curve over a prime field. Use ecprimeprojcurve.",
1097
1098 0, /* @tp_traverse@ */
1099 0, /* @tp_clear@ */
1100 eccurve_pyrichcompare, /* @tp_richcompare@ */
1101 0, /* @tp_weaklistoffset@ */
1102 0, /* @tp_iter@ */
1103 0, /* @tp_iternexr@ */
1104 0, /* @tp_methods@ */
1105 0, /* @tp_members@ */
1106 0, /* @tp_getset@ */
1107 0, /* @tp_base@ */
1108 0, /* @tp_dict@ */
1109 0, /* @tp_descr_get@ */
1110 0, /* @tp_descr_set@ */
1111 0, /* @tp_dictoffset@ */
1112 0, /* @tp_init@ */
1113 PyType_GenericAlloc, /* @tp_alloc@ */
1114 ecprimecurve_pynew, /* @tp_new@ */
3aa33042 1115 0, /* @tp_free@ */
d7ab1bab 1116 0 /* @tp_is_gc@ */
1117};
1118
1119static PyObject *ecprimeprojcurve_pynew(PyTypeObject *ty,
1120 PyObject *arg, PyObject *kw)
1121{
1122 return (eccurve_pynew(ty, ec_primeproj, arg, kw));
1123}
1124
1125static PyTypeObject ecprimeprojcurve_pytype_skel = {
1126 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
1127 "catacomb.ECPrimeProjCurve", /* @tp_name@ */
1128 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1129 0, /* @tp_itemsize@ */
1130
1131 eccurve_pydealloc, /* @tp_dealloc@ */
1132 0, /* @tp_print@ */
1133 0, /* @tp_getattr@ */
1134 0, /* @tp_setattr@ */
1135 0, /* @tp_compare@ */
1136 0, /* @tp_repr@ */
1137 0, /* @tp_as_number@ */
1138 0, /* @tp_as_sequence@ */
1139 0, /* @tp_as_mapping@ */
1140 0, /* @tp_hash@ */
1141 0, /* @tp_call@ */
1142 0, /* @tp_str@ */
1143 0, /* @tp_getattro@ */
1144 0, /* @tp_setattro@ */
1145 0, /* @tp_as_buffer@ */
1146 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1147 Py_TPFLAGS_BASETYPE,
1148
1149 /* @tp_doc@ */
1150 "An elliptic curve over a prime field, using projective coordinates.",
1151
1152 0, /* @tp_traverse@ */
1153 0, /* @tp_clear@ */
1154 eccurve_pyrichcompare, /* @tp_richcompare@ */
1155 0, /* @tp_weaklistoffset@ */
1156 0, /* @tp_iter@ */
1157 0, /* @tp_iternexr@ */
1158 0, /* @tp_methods@ */
1159 0, /* @tp_members@ */
1160 0, /* @tp_getset@ */
1161 0, /* @tp_base@ */
1162 0, /* @tp_dict@ */
1163 0, /* @tp_descr_get@ */
1164 0, /* @tp_descr_set@ */
1165 0, /* @tp_dictoffset@ */
1166 0, /* @tp_init@ */
1167 PyType_GenericAlloc, /* @tp_alloc@ */
1168 ecprimeprojcurve_pynew, /* @tp_new@ */
3aa33042 1169 0, /* @tp_free@ */
d7ab1bab 1170 0 /* @tp_is_gc@ */
1171};
1172
1173static PyObject *ecbincurve_pynew(PyTypeObject *ty,
1174 PyObject *arg, PyObject *kw)
1175{
1176 return (eccurve_pynew(ty, ec_bin, arg, kw));
1177}
1178
1179static PyTypeObject ecbincurve_pytype_skel = {
1180 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
1181 "catacomb.ECBinCurve", /* @tp_name@ */
1182 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1183 0, /* @tp_itemsize@ */
1184
1185 eccurve_pydealloc, /* @tp_dealloc@ */
1186 0, /* @tp_print@ */
1187 0, /* @tp_getattr@ */
1188 0, /* @tp_setattr@ */
1189 0, /* @tp_compare@ */
1190 0, /* @tp_repr@ */
1191 0, /* @tp_as_number@ */
1192 0, /* @tp_as_sequence@ */
1193 0, /* @tp_as_mapping@ */
1194 0, /* @tp_hash@ */
1195 0, /* @tp_call@ */
1196 0, /* @tp_str@ */
1197 0, /* @tp_getattro@ */
1198 0, /* @tp_setattro@ */
1199 0, /* @tp_as_buffer@ */
1200 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1201 Py_TPFLAGS_BASETYPE,
1202
1203 /* @tp_doc@ */
1204 "An elliptic curve over a binary field. Use ecbinprojcurve.",
1205
1206 0, /* @tp_traverse@ */
1207 0, /* @tp_clear@ */
1208 eccurve_pyrichcompare, /* @tp_richcompare@ */
1209 0, /* @tp_weaklistoffset@ */
1210 0, /* @tp_iter@ */
1211 0, /* @tp_iternexr@ */
1212 0, /* @tp_methods@ */
1213 0, /* @tp_members@ */
1214 0, /* @tp_getset@ */
1215 0, /* @tp_base@ */
1216 0, /* @tp_dict@ */
1217 0, /* @tp_descr_get@ */
1218 0, /* @tp_descr_set@ */
1219 0, /* @tp_dictoffset@ */
1220 0, /* @tp_init@ */
1221 PyType_GenericAlloc, /* @tp_alloc@ */
1222 ecbincurve_pynew, /* @tp_new@ */
3aa33042 1223 0, /* @tp_free@ */
d7ab1bab 1224 0 /* @tp_is_gc@ */
1225};
1226
1227static PyObject *ecbinprojcurve_pynew(PyTypeObject *ty,
1228 PyObject *arg, PyObject *kw)
1229{
1230 return (eccurve_pynew(ty, ec_binproj, arg, kw));
1231}
1232
1233static PyTypeObject ecbinprojcurve_pytype_skel = {
1234 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
1235 "catacomb.ECBinProjCurve", /* @tp_name@ */
1236 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1237 0, /* @tp_itemsize@ */
1238
1239 eccurve_pydealloc, /* @tp_dealloc@ */
1240 0, /* @tp_print@ */
1241 0, /* @tp_getattr@ */
1242 0, /* @tp_setattr@ */
1243 0, /* @tp_compare@ */
1244 0, /* @tp_repr@ */
1245 0, /* @tp_as_number@ */
1246 0, /* @tp_as_sequence@ */
1247 0, /* @tp_as_mapping@ */
1248 0, /* @tp_hash@ */
1249 0, /* @tp_call@ */
1250 0, /* @tp_str@ */
1251 0, /* @tp_getattro@ */
1252 0, /* @tp_setattro@ */
1253 0, /* @tp_as_buffer@ */
1254 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1255 Py_TPFLAGS_BASETYPE,
1256
1257 /* @tp_doc@ */
1258 "An elliptic curve over a binary field, using projective coordinates.",
1259
1260 0, /* @tp_traverse@ */
1261 0, /* @tp_clear@ */
1262 eccurve_pyrichcompare, /* @tp_richcompare@ */
1263 0, /* @tp_weaklistoffset@ */
1264 0, /* @tp_iter@ */
1265 0, /* @tp_iternexr@ */
1266 0, /* @tp_methods@ */
1267 0, /* @tp_members@ */
1268 0, /* @tp_getset@ */
1269 0, /* @tp_base@ */
1270 0, /* @tp_dict@ */
1271 0, /* @tp_descr_get@ */
1272 0, /* @tp_descr_set@ */
1273 0, /* @tp_dictoffset@ */
1274 0, /* @tp_init@ */
1275 PyType_GenericAlloc, /* @tp_alloc@ */
1276 ecbinprojcurve_pynew, /* @tp_new@ */
3aa33042 1277 0, /* @tp_free@ */
d7ab1bab 1278 0 /* @tp_is_gc@ */
1279};
1280
1281/*----- Curve info --------------------------------------------------------*/
1282
1283static int ncurves = -1;
1284
1285void ecinfo_copy(ec_info *eic, const ec_info *ei)
1286{
1287 eic->c = eccurve_copy(ei->c);
1288 EC_CREATE(&eic->g);
1289 EC_COPY(&eic->g, &ei->g);
1290 eic->r = MP_COPY(ei->r);
1291 eic->h = MP_COPY(ei->h);
1292}
1293
1294PyObject *ecinfo_pywrap(ec_info *ei)
1295{
1296 ecinfo_pyobj *o;
1297
1298 o = PyObject_NEW(ecinfo_pyobj, ecinfo_pytype);
1299 o->ei = *ei;
1300 o->cobj = eccurve_pywrap(0, o->ei.c);
1301 Py_INCREF(o->cobj);
1302 return ((PyObject *)o);
1303}
1304
1305static void ecinfo_pydealloc(PyObject *me)
1306{
1307 ec_info *ei = ECINFO_EI(me);
1308 EC_DESTROY(&ei->g);
1309 MP_DROP(ei->r);
1310 MP_DROP(ei->h);
1311 Py_DECREF(ECINFO_COBJ(me));
3aa33042 1312 FREEOBJ(me);
d7ab1bab 1313}
1314
1315static PyObject *ecinfo_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
1316{
1317 ec_info ei = { 0 };
1318 PyObject *e, *g;
1319 char *kwlist[] = { "curve", "G", "r", "h", 0 };
1320 ecinfo_pyobj *rc = 0;
1321
1322 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O!O&O&:new", kwlist,
1323 eccurve_pytype, &e, ecpt_pytype, &g,
1324 convmp, &ei.r, convmp, &ei.h))
1325 goto end;
1326 if (ECPT_C(g) != ECCURVE_C(e) && !ec_samep(ECPT_C(g), ECCURVE_C(e)))
1327 TYERR("point not from this curve");
1328 ei.c = ECCURVE_C(e);
1329 EC_CREATE(&ei.g);
1330 EC_COPY(&ei.g, ECPT_P(g));
1331 rc = (ecinfo_pyobj *)ty->tp_alloc(ty, 0);
1332 rc->ei = ei;
1333 rc->cobj = e;
1334 Py_INCREF(rc->cobj);
1335 return ((PyObject *)rc);
1336
1337end:
1338 mp_drop(ei.r);
1339 mp_drop(ei.h);
1340 return (0);
1341}
1342
1343static PyObject *meth__ECInfo_parse(PyObject *me, PyObject *arg)
1344{
1345 char *p;
1346 qd_parse qd;
1347 ec_info ei;
1348 PyObject *rc = 0;
1349
1350 if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p))
1351 goto end;
1352 qd.p = p;
1353 qd.e = 0;
1354 if (ec_infoparse(&qd, &ei))
1355 SYNERR(qd.e);
1356 rc = Py_BuildValue("(Ns)", ecinfo_pywrap(&ei), qd.p);
1357end:
1358 return (rc);
1359}
1360
1361static PyObject *meth__ECInfo__curven(PyObject *me, PyObject *arg)
1362{
1363 int i;
1364 ec_info ei;
1365 PyObject *rc = 0;
1366
1367 if (!PyArg_ParseTuple(arg, "Oi:_curven", &me, &i)) goto end;
1368 if (i < 0 || i >= ncurves) VALERR("curve index out of range");
1369 ec_infofromdata(&ei, ectab[i].data);
1370 rc = ecinfo_pywrap(&ei);
1371end:
1372 return (rc);
1373}
1374
1375static PyObject *ecinfo_pyrichcompare(PyObject *x, PyObject *y, int op)
1376{
1377 int b = ec_sameinfop(ECINFO_EI(x), ECINFO_EI(y));
1378 switch (op) {
1379 case Py_EQ: break;
1380 case Py_NE: b = !b;
1381 default: TYERR("can't order elliptic curve infos");
1382 }
1383 return (getbool(b));
1384end:
1385 return (0);
1386}
1387
1388static PyObject *eimeth_check(PyObject *me, PyObject *arg, PyObject *kw)
1389{
1390 char *kwlist[] = { "rng", 0 };
1391 grand *r = &rand_global;
1392 const char *p;
1393
1394 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:check", kwlist,
1395 convgrand, &r))
1396 goto end;
1397 if ((p = ec_checkinfo(ECINFO_EI(me), r)) != 0)
1398 VALERR(p);
1399 RETURN_ME;
1400end:
1401 return (0);
1402}
1403
1404static PyObject *eiget_curve(PyObject *me, void *hunoz)
1405 { RETURN_OBJ(ECINFO_COBJ(me)); }
1406
1407static PyObject *eiget_G(PyObject *me, void *hunoz)
1408{
1409 ec_info *ei = ECINFO_EI(me);
1410 ec p = EC_INIT;
1411 EC_IN(ei->c, &p, &ei->g);
1412 return (ecpt_pywrap(ECINFO_COBJ(me), &p));
1413}
1414
1415static PyObject *eiget_r(PyObject *me, void *hunoz)
1416 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->r))); }
1417
1418static PyObject *eiget_h(PyObject *me, void *hunoz)
1419 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->h))); }
1420
1421static PyGetSetDef ecinfo_pygetset[] = {
1422#define GETSETNAME(op, name) ei##op##_##name
1423 GET (curve, "I.curve -> the elliptic curve")
1424 GET (G, "I.G -> generator point for the group")
1425 GET (r, "I.r -> order of the group (and hence of G")
1426 GET (h, "I.h -> cofactor of the group")
1427#undef GETSETNAME
1428 { 0 }
1429};
1430
1431static PyMethodDef ecinfo_pymethods[] = {
1432#define METHNAME(name) eimeth_##name
1433 KWMETH(check, "I.check() -> None")
1434#undef METHNAME
1435 { 0 }
1436};
1437
1438static PyTypeObject ecinfo_pytype_skel = {
1439 PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */
1440 "catacomb.ECInfo", /* @tp_name@ */
1441 sizeof(ecinfo_pyobj), /* @tp_basicsize@ */
1442 0, /* @tp_itemsize@ */
1443
1444 ecinfo_pydealloc, /* @tp_dealloc@ */
1445 0, /* @tp_print@ */
1446 0, /* @tp_getattr@ */
1447 0, /* @tp_setattr@ */
1448 0, /* @tp_compare@ */
1449 0, /* @tp_repr@ */
1450 0, /* @tp_as_number@ */
1451 0, /* @tp_as_sequence@ */
1452 0, /* @tp_as_mapping@ */
1453 0, /* @tp_hash@ */
1454 0, /* @tp_call@ */
1455 0, /* @tp_str@ */
1456 0, /* @tp_getattro@ */
1457 0, /* @tp_setattro@ */
1458 0, /* @tp_as_buffer@ */
1459 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1460 Py_TPFLAGS_BASETYPE,
1461
1462 /* @tp_doc@ */
1463 "Elliptic curve domain parameters.",
1464
1465 0, /* @tp_traverse@ */
1466 0, /* @tp_clear@ */
1467 ecinfo_pyrichcompare, /* @tp_richcompare@ */
1468 0, /* @tp_weaklistoffset@ */
1469 0, /* @tp_iter@ */
1470 0, /* @tp_iternexr@ */
1471 ecinfo_pymethods, /* @tp_methods@ */
1472 0, /* @tp_members@ */
1473 ecinfo_pygetset, /* @tp_getset@ */
1474 0, /* @tp_base@ */
1475 0, /* @tp_dict@ */
1476 0, /* @tp_descr_get@ */
1477 0, /* @tp_descr_set@ */
1478 0, /* @tp_dictoffset@ */
1479 0, /* @tp_init@ */
1480 PyType_GenericAlloc, /* @tp_alloc@ */
1481 ecinfo_pynew, /* @tp_new@ */
3aa33042 1482 0, /* @tp_free@ */
d7ab1bab 1483 0 /* @tp_is_gc@ */
1484};
1485
1486/*----- Setup -------------------------------------------------------------*/
1487
1488static PyMethodDef methods[] = {
1489#define METHNAME(func) meth_##func
1490 METH (_ECPt_frombuf, "frombuf(E, STR) -> (P, REST)")
1491 METH (_ECPtCurve_fromraw, "fromraw(E, STR) -> (P, REST)")
1492 METH (_ECPt_parse, "parse(E, STR) -> (P, REST)")
1493 METH (_ECCurve_parse, "parse(STR) -> (E, REST)")
1494 METH (_ECInfo_parse, "parse(STR) -> (I, REST)")
1495 METH (_ECInfo__curven, "_curven(N) -> I")
1496#undef METHNAME
1497 { 0 }
1498};
1499
1500void ec_pyinit(void)
1501{
1502 INITTYPE(ecpt, root);
1503 INITTYPE(ecptcurve, ecpt);
1504 INITTYPE(eccurve, type);
1505 INITTYPE(ecprimecurve, eccurve);
1506 INITTYPE(ecprimeprojcurve, ecprimecurve);
1507 INITTYPE(ecbincurve, eccurve);
1508 INITTYPE(ecbinprojcurve, ecbincurve);
1509 INITTYPE(ecinfo, root);
1510 addmethods(methods);
1511}
1512
1513static PyObject *namedcurves(void)
1514{
1515 int i, j;
1516 const char *p;
1517 PyObject *d, *c;
1518
1519 d = PyDict_New();
1520 for (i = 0; ectab[i].name; i++) {
1521 p = ectab[i].name;
1522 for (j = 0; j < i; j++) {
1523 if (ectab[i].data == ectab[j].data) {
1524 c = PyDict_GetItemString(d, (/*unconst*/ char *)ectab[j].name);
1525 Py_INCREF(c);
1526 goto found;
1527 }
1528 }
1529 c = PyInt_FromLong(i);
1530 found:
1531 PyDict_SetItemString(d, (/*unconst*/ char *)ectab[i].name, c);
1532 Py_DECREF(c);
1533 }
1534 ncurves = i;
1535 return (d);
1536}
1537
1538void ec_pyinsert(PyObject *mod)
1539{
1540 INSERT("ECPt", ecpt_pytype);
1541 INSERT("ECPtCurve", ecptcurve_pytype);
1542 INSERT("ECCurve", eccurve_pytype);
1543 INSERT("ECPrimeCurve", ecprimecurve_pytype);
1544 INSERT("ECPrimeProjCurve", ecprimeprojcurve_pytype);
1545 INSERT("ECBinCurve", ecbincurve_pytype);
1546 INSERT("ECBinProjCurve", ecbinprojcurve_pytype);
1547 INSERT("ECInfo", ecinfo_pytype);
1548 INSERT("_eccurves", namedcurves());
1549}
1550
1551/*----- That's all, folks -------------------------------------------------*/
Catacomb cryptographic library -- Python bindings