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[catacomb-python] / ec.c
1 /* -*-c-*-
2 *
3 * Elliptic curves
4 *
5 * (c) 2004 Straylight/Edgeware
6 */
7
8 /*----- Licensing notice --------------------------------------------------*
9 *
10 * This file is part of the Python interface to Catacomb.
11 *
12 * Catacomb/Python is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * Catacomb/Python is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with Catacomb/Python; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 */
26
27 /*----- Header files ------------------------------------------------------*/
28
29 #include "catacomb-python.h"
30
31 /*----- Utility functions -------------------------------------------------*/
32
33 PyTypeObject *ecpt_pytype;
34 PyTypeObject *ecptcurve_pytype;
35 PyTypeObject *eccurve_pytype;
36 PyTypeObject *ecprimecurve_pytype;
37 PyTypeObject *ecprimeprojcurve_pytype;
38 PyTypeObject *ecbincurve_pytype;
39 PyTypeObject *ecbinprojcurve_pytype;
40 PyTypeObject *ecinfo_pytype;
41
42 ec_curve *eccurve_copy(ec_curve *c)
43 {
44 field *f;
45 mp *a, *b;
46
47 if ((f = field_copy(c->f)) == 0)
48 return (0);
49 a = F_OUT(f, MP_NEW, c->a);
50 b = F_OUT(f, MP_NEW, c->b);
51 if (strcmp(EC_NAME(c), "prime") == 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
67 static PyObject *ecpt_dopywrap(PyObject *cobj, ec_curve *c, ec *p)
68 {
69 ecpt_pyobj *z = PyObject_New(ecpt_pyobj, (PyTypeObject *)cobj);
70 z->p = *p;
71 z->c = c;
72 Py_INCREF(cobj);
73 return ((PyObject *)z);
74 }
75
76 PyObject *ecpt_pywrap(PyObject *cobj, ec *p)
77 { return (ecpt_dopywrap(cobj, ECCURVE_C(cobj), p)); }
78
79 PyObject *ecpt_pywrapout(void *cobj, ec *p)
80 {
81 ec_curve *c;
82
83 if (!PyType_IsSubtype(cobj, ecptcurve_pytype))
84 c = 0;
85 else {
86 c = ECCURVE_C(cobj);
87 EC_IN(ECCURVE_C(cobj), p, p);
88 }
89 return (ecpt_dopywrap(cobj, c, p));
90 }
91
92 int toecpt(ec_curve *c, ec *d, PyObject *p)
93 {
94 if (ECPTCURVE_PYCHECK(p)) {
95 if (ECPT_C(p) != c && !ec_samep(ECPT_C(p), c))
96 return (-1);
97 EC_COPY(d, ECPT_P(p));
98 } else if (ECPT_PYCHECK(p))
99 EC_IN(c, d, ECPT_P(p));
100 else
101 return (-1);
102 return (0);
103 }
104
105 int getecpt(ec_curve *c, ec *d, PyObject *p)
106 {
107 if (toecpt(c, d, p)) {
108 PyErr_Format(PyExc_TypeError, "can't convert %.100s to ecpt",
109 p->ob_type->tp_name);
110 return (-1);
111 }
112 return (0);
113 }
114
115 void getecptout(ec *d, PyObject *p)
116 {
117 if (ECPTCURVE_PYCHECK(p))
118 EC_OUT(ECPT_C(p), d, ECPT_P(p));
119 else {
120 assert(ECPT_PYCHECK(p));
121 EC_COPY(d, ECPT_P(p));
122 }
123 }
124
125 int convecpt(PyObject *o, void *p)
126 {
127 if (!ECPT_PYCHECK(o))
128 TYERR("want elliptic curve point");
129 getecptout(p, o);
130 return (1);
131 end:
132 return (0);
133 }
134
135 /*----- Curve points ------------------------------------------------------*/
136
137 static int ecbinop(PyObject *x, PyObject *y,
138 ec_curve **c, PyObject **cobj, ec *xx, ec *yy)
139 {
140 if (ECPTCURVE_PYCHECK(x)) *cobj = ECPT_COBJ(x);
141 else if (ECPTCURVE_PYCHECK(y)) *cobj = ECPT_COBJ(y);
142 else return (-1);
143 *c = ECCURVE_C(*cobj);
144 if (toecpt(*c, xx, x) || toecpt(*c, yy, y)) return (-1);
145 return (0);
146 }
147
148 #define BINOP(name) \
149 static PyObject *ecpt_py##name(PyObject *x, PyObject *y) { \
150 ec xx = EC_INIT, yy = EC_INIT, zz = EC_INIT; \
151 PyObject *cobj; \
152 ec_curve *c; \
153 if (ecbinop(x, y, &c, &cobj, &xx, &yy)) RETURN_NOTIMPL; \
154 c->ops->name(c, &zz, &xx, &yy); \
155 EC_DESTROY(&xx); EC_DESTROY(&yy); \
156 return (ecpt_pywrap(ECPT_COBJ(x), &zz)); \
157 }
158 BINOP(add)
159 BINOP(sub)
160 #undef BINOP
161
162 #define UNOP(name) \
163 static PyObject *ecpt_py##name(PyObject *x) { \
164 ec zz = EC_INIT; \
165 ec_curve *c = ECPT_C(x); \
166 c->ops->name(c, &zz, ECPT_P(x)); \
167 return (ecpt_pywrap(ECPT_COBJ(x), &zz)); \
168 }
169 UNOP(neg)
170 #undef UNOP
171
172 static PyObject *ecpt_pyid(PyObject *x) { RETURN_OBJ(x); }
173
174 static int ecpt_pynonzerop(PyObject *x) { return (!EC_ATINF(ECPT_P(x))); }
175
176 static void ecpt_pydealloc(PyObject *x)
177 {
178 EC_DESTROY(ECPT_P(x));
179 Py_DECREF(ECPT_COBJ(x));
180 FREEOBJ(x);
181 }
182
183 static PyObject *ecpt_pymul(PyObject *x, PyObject *y)
184 {
185 mp *xx;
186 ec zz = EC_INIT;
187
188 if (ECPT_PYCHECK(x)) { PyObject *t; t = x; x = y; y = t; }
189 if (!ECPT_PYCHECK(y) || (xx = tomp(x)) == 0) RETURN_NOTIMPL;
190 ec_imul(ECPT_C(y), &zz, ECPT_P(y), xx);
191 MP_DROP(xx);
192 return (ecpt_pywrap(ECPT_COBJ(y), &zz));
193 }
194
195 static long ecpt_pyhash(PyObject *me)
196 {
197 uint32 h;
198 buf b;
199 ec p = EC_INIT;
200 size_t sz = 2*ECPT_C(me)->f->noctets + 1;
201 octet *q = xmalloc(sz);
202
203 h = 0xe0fdd039 + ECPT_C(me)->f->ops->ty;
204 buf_init(&b, q, sz);
205 EC_OUT(ECPT_C(me), &p, ECPT_P(me));
206 ec_putraw(ECPT_C(me), &b, &p);
207 EC_DESTROY(&p);
208 h = unihash_hash(&unihash_global, h, BBASE(&b), BLEN(&b));
209 xfree(q);
210 return (h % LONG_MAX);
211 }
212
213 static PyObject *ecpt_pyrichcompare(PyObject *x, PyObject *y, int op)
214 {
215 ec_curve *c;
216 PyObject *cobj;
217 ec p = EC_INIT, q = EC_INIT;
218 int b;
219 PyObject *rc = 0;
220
221 if (ecbinop(x, y, &c, &cobj, &p, &q)) RETURN_NOTIMPL;
222 EC_OUT(c, &p, &p);
223 EC_OUT(c, &q, &q);
224 switch (op) {
225 case Py_EQ: b = EC_EQ(&p, &q); break;
226 case Py_NE: b = !EC_EQ(&p, &q); break;
227 default: TYERR("elliptic curve points are unordered");
228 }
229 rc = getbool(b);
230 end:
231 EC_DESTROY(&p);
232 EC_DESTROY(&q);
233 return (rc);
234 }
235
236 static PyObject *epmeth_oncurvep(PyObject *me, PyObject *arg)
237 {
238 if (!PyArg_ParseTuple(arg, ":oncurvep")) return (0);
239 return (getbool(EC_ATINF(ECPT_P(me)) ||
240 !EC_CHECK(ECPT_C(me), ECPT_P(me))));
241 }
242
243 static PyObject *epmeth_dbl(PyObject *me, PyObject *arg)
244 {
245 ec p = EC_INIT;
246 if (!PyArg_ParseTuple(arg, ":dbl")) return (0);
247 EC_DBL(ECPT_C(me), &p, ECPT_P(me));
248 return (ecpt_pywrap(ECPT_COBJ(me), &p));
249 }
250
251 static PyObject *epmeth_tobuf(PyObject *me, PyObject *arg)
252 {
253 buf b;
254 ec p = EC_INIT;
255 PyObject *rc;
256 size_t n;
257
258 if (!PyArg_ParseTuple(arg, ":tobuf")) return (0);
259 getecptout(&p, me);
260 if (EC_ATINF(&p))
261 n = 2;
262 else
263 n = mp_octets(p.x) + mp_octets(p.y) + 4;
264 rc = bytestring_pywrap(0, n);
265 buf_init(&b, PyString_AS_STRING(rc), n);
266 buf_putec(&b, &p);
267 assert(BOK(&b));
268 _PyString_Resize(&rc, BLEN(&b));
269 EC_DESTROY(&p);
270 return (rc);
271 }
272
273 static PyObject *epmeth_toraw(PyObject *me, PyObject *arg)
274 {
275 buf b;
276 PyObject *rc;
277 char *p;
278 ec_curve *c = ECPT_C(me);
279 ec pp = EC_INIT;
280 int len;
281
282 if (!PyArg_ParseTuple(arg, ":toraw")) return (0);
283 len = c->f->noctets * 2 + 1;
284 rc = bytestring_pywrap(0, len);
285 p = PyString_AS_STRING(rc);
286 buf_init(&b, p, len);
287 EC_OUT(c, &pp, ECPT_P(me));
288 ec_putraw(c, &b, &pp);
289 EC_DESTROY(&pp);
290 _PyString_Resize(&rc, BLEN(&b));
291 return (rc);
292 }
293
294 static PyObject *epmeth_ec2osp(PyObject *me, PyObject *arg, PyObject *kw)
295 {
296 buf b;
297 PyObject *rc;
298 char *p;
299 ec_curve *c = ECPT_C(me);
300 ec pp = EC_INIT;
301 int f = EC_EXPLY;
302 int len;
303 char *kwlist[] = { "flags", 0 };
304
305 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|i:ectosp", kwlist, &f))
306 return (0);
307 len = c->f->noctets * 2 + 1;
308 rc = bytestring_pywrap(0, len);
309 p = PyString_AS_STRING(rc);
310 buf_init(&b, p, len);
311 EC_OUT(c, &pp, ECPT_P(me));
312 if (ec_ec2osp(c, f, &b, &pp)) {
313 Py_DECREF(rc); rc = 0;
314 VALERR("invalid flags");
315 }
316 EC_DESTROY(&pp);
317 _PyString_Resize(&rc, BLEN(&b));
318 end:
319 return (rc);
320 }
321
322 static PyObject *epget_curve(PyObject *me, void *hunoz)
323 { RETURN_OBJ(ECPT_COBJ(me)); }
324
325 static PyObject *epncget_ix(PyObject *me, void *hunoz)
326 {
327 ec p = EC_INIT;
328 PyObject *rc;
329 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
330 getecptout(&p, me);
331 rc = mp_pywrap(MP_COPY(p.x));
332 EC_DESTROY(&p);
333 return (rc);
334 }
335
336 static PyObject *epncget_iy(PyObject *me, void *hunoz)
337 {
338 ec p = EC_INIT;
339 PyObject *rc;
340 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
341 getecptout(&p, me);
342 rc = mp_pywrap(MP_COPY(p.y));
343 EC_DESTROY(&p);
344 return (rc);
345 }
346
347 static PyObject *epncget_point(PyObject *me, void *hunoz)
348 { RETURN_ME; }
349
350 static PyObject *epget_point(PyObject *me, void *hunoz)
351 {
352 ec p = EC_INIT;
353 getecptout(&p, me);
354 return (ecpt_pywrapout(ecpt_pytype, &p));
355 }
356
357 static PyObject *epget_x(PyObject *me, void *hunoz)
358 {
359 ec_curve *c = ECPT_C(me);
360 ec *pp = ECPT_P(me);
361 PyObject *fobj = ECPT_FOBJ(me);
362 ec p = EC_INIT;
363 PyObject *rc;
364
365 if (EC_ATINF(pp)) RETURN_NONE;
366 EC_OUT(c, &p, pp);
367 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.x));
368 EC_DESTROY(&p);
369 return (rc);
370 }
371
372 static PyObject *epget_y(PyObject *me, void *hunoz)
373 {
374 ec_curve *c = ECPT_C(me);
375 ec *pp = ECPT_P(me);
376 PyObject *fobj = ECPT_FOBJ(me);
377 ec p = EC_INIT;
378 PyObject *rc;
379
380 if (EC_ATINF(pp)) RETURN_NONE;
381 EC_OUT(c, &p, pp);
382 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.y));
383 EC_DESTROY(&p);
384 return (rc);
385 }
386
387 static PyObject *epget__x(PyObject *me, void *hunoz)
388 {
389 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
390 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->x)));
391 }
392
393 static PyObject *epget__y(PyObject *me, void *hunoz)
394 {
395 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
396 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->y)));
397 }
398
399 static PyObject *epget__z(PyObject *me, void *hunoz)
400 {
401 if (EC_ATINF(ECPT_P(me)) || !ECPT_P(me)->z) RETURN_NONE;
402 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->z)));
403 }
404
405 static mp *coord_in(field *f, PyObject *x)
406 {
407 mp *xx;
408 if (FE_PYCHECK(x) && FE_F(x) == f)
409 return (MP_COPY(FE_X(x)));
410 else if ((xx = getmp(x)) == 0)
411 return (0);
412 else
413 return (F_IN(f, xx, xx));
414 }
415
416 static int ecptxl_3(ec_curve *c, ec *p,
417 PyObject *x, PyObject *y, PyObject *z)
418 {
419 int rc = -1;
420
421 if (!x || !y || !z) TYERR("missing argument");
422 if (!c) VALERR("internal form with no curve!");
423 if ((p->x = coord_in(c->f, x)) == 0 ||
424 (p->y = coord_in(c->f, y)) == 0 ||
425 (z != Py_None && (p->z = coord_in(c->f, z)) == 0))
426 goto end;
427 if (!p->z) p->z = MP_COPY(c->f->one); /* just in case */
428 rc = 0;
429 end:
430 return (rc);
431 }
432
433 static int ecptxl_2(ec_curve *c, ec *p, PyObject *x, PyObject *y)
434 {
435 int rc = -1;
436
437 if (!x || !y) TYERR("missing argument");
438 if ((p->x = getmp(x)) == 0 ||
439 (p->y = getmp(y)) == 0)
440 goto end;
441 if (c) EC_IN(c, p, p);
442 rc = 0;
443 end:
444 return (rc);
445 }
446
447 static int ecptxl_1(ec_curve *c, ec *p, PyObject *x)
448 {
449 int rc = -1;
450 PyObject *y = 0, *z = 0, *t = 0;
451 mp *xx = 0;
452 const void *q;
453 int n;
454 qd_parse qd;
455
456 Py_XINCREF(x);
457 if (!x || x == Py_None)
458 /*cool*/;
459 else if (ECPT_PYCHECK(x)) {
460 getecptout(p, x);
461 goto fix;
462 } else if (PyString_Check(x)) {
463 if (PyObject_AsReadBuffer(x, &q, 0))
464 goto end;
465 qd.p = q;
466 qd.e = 0;
467 if (!ec_ptparse(&qd, p))
468 VALERR(qd.e);
469 goto fix;
470 } else if (c && (xx = tomp(x)) != 0) {
471 xx = F_IN(c->f, xx, xx);
472 if (!EC_FIND(c, p, xx)) VALERR("not on the curve");
473 } else if (PySequence_Check(x)) {
474 t = x; x = 0;
475 n = PySequence_Size(t);
476 if (n != 2 && (n != 3 || !c))
477 TYERR("want sequence of two or three items");
478 if ((x = PySequence_GetItem(t, 0)) == 0 ||
479 (y = PySequence_GetItem(t, 1)) == 0 ||
480 (n == 3 && (z = PySequence_GetItem(t, 2)) == 0))
481 goto end;
482 rc = (n == 2) ? ecptxl_2(c, p, x, y) : ecptxl_3(c, p, x, y, z);
483 } else
484 TYERR("can't convert to curve point");
485 goto ok;
486
487 fix:
488 if (c) EC_IN(c, p, p);
489 ok:
490 rc = 0;
491 end:
492 Py_XDECREF(x); Py_XDECREF(y); Py_XDECREF(z); Py_XDECREF(t);
493 mp_drop(xx);
494 return (rc);
495 }
496
497 static int ecptxl(ec_curve *c, ec *p, PyObject *x, PyObject *y, PyObject *z)
498 {
499 if (z)
500 return (ecptxl_3(c, p, x, y, z));
501 else if (y)
502 return (ecptxl_2(c, p, x, y));
503 else
504 return (ecptxl_1(c, p, x));
505 }
506
507 static PyObject *ecptnc_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
508 {
509 PyObject *x = 0, *y = 0, *z = 0;
510 ec p = EC_INIT;
511 char *kwlist[] = { "x", "y", 0 };
512
513 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OO:new", kwlist, &x, &y) ||
514 ecptxl(0, &p, x, y, z))
515 goto end;
516 return (ecpt_pywrapout(ty, &p));
517 end:
518 EC_DESTROY(&p);
519 return (0);
520 }
521
522 static PyObject *ecpt_pyint(PyObject *me)
523 {
524 ec p = EC_INIT;
525 long l;
526 PyObject *rc = 0;
527 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
528 getecptout(&p, me);
529 if (!mp_tolong_checked(p.x, &l, 0)) rc = PyInt_FromLong(l);
530 else rc = mp_topylong(p.x);
531 end:
532 EC_DESTROY(&p);
533 return (rc);
534 }
535
536 static PyObject *ecpt_pylong(PyObject *me)
537 {
538 ec p = EC_INIT;
539 PyObject *rc = 0;
540 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
541 getecptout(&p, me);
542 rc = mp_topylong(p.x);
543 end:
544 EC_DESTROY(&p);
545 return (rc);
546 }
547
548 static PyObject *ecpt_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
549 {
550 PyObject *x = 0, *y = 0, *z = 0;
551 ec p = EC_INIT;
552 char *kwlist[] = { "x", "y", "z", 0 };
553
554 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OOO:new", kwlist,
555 &x, &y, &z) ||
556 ecptxl(ECCURVE_C(ty), &p, x, y, z))
557 goto end;
558 return (ecpt_pywrap((PyObject *)ty, &p));
559 end:
560 EC_DESTROY(&p);
561 return (0);
562 }
563
564 static PyGetSetDef ecptnc_pygetset[] = {
565 #define GETSETNAME(op, name) epnc##op##_##name
566 GET (ix, "P.ix -> integer x coordinate of P")
567 GET (iy, "P.iy -> integer y coordinate of P")
568 GET (point, "P.point -> standalone curve point (no-op)")
569 #undef GETSETNAME
570 { 0 }
571 };
572
573 static PyMethodDef ecptnc_pymethods[] = {
574 #define METHNAME(func) epmeth_##func
575 METH (tobuf, "X.tobuf() -> BIN")
576 #undef METHNAME
577 { 0 }
578 };
579
580 static PyNumberMethods ecpt_pynumber = {
581 0, /* @nb_add@ */
582 0, /* @nb_subtract@ */
583 0, /* @nb_multiply@ */
584 0, /* @nb_divide@ */
585 0, /* @nb_remainder@ */
586 0, /* @nb_divmod@ */
587 0, /* @nb_power@ */
588 0, /* @nb_negative@ */
589 0, /* @nb_positive@ */
590 0, /* @nb_absolute@ */
591 ecpt_pynonzerop, /* @nb_nonzero@ */
592 0, /* @nb_invert@ */
593 0, /* @nb_lshift@ */
594 0, /* @nb_rshift@ */
595 0, /* @nb_and@ */
596 0, /* @nb_xor@ */
597 0, /* @nb_or@ */
598 0, /* @nb_coerce@ */
599 ecpt_pyint, /* @nb_int@ */
600 ecpt_pylong, /* @nb_long@ */
601 0, /* @nb_float@ */
602 0, /* @nb_oct@ */
603 0, /* @nb_hex@ */
604
605 0, /* @nb_inplace_add@ */
606 0, /* @nb_inplace_subtract@ */
607 0, /* @nb_inplace_multiply@ */
608 0, /* @nb_inplace_divide@ */
609 0, /* @nb_inplace_remainder@ */
610 0, /* @nb_inplace_power@ */
611 0, /* @nb_inplace_lshift@ */
612 0, /* @nb_inplace_rshift@ */
613 0, /* @nb_inplace_and@ */
614 0, /* @nb_inplace_xor@ */
615 0, /* @nb_inplace_or@ */
616
617 0, /* @nb_floor_divide@ */
618 0, /* @nb_true_divide@ */
619 0, /* @nb_inplace_floor_divide@ */
620 0, /* @nb_inplace_true_divide@ */
621 };
622
623 static PyTypeObject ecpt_pytype_skel = {
624 PyObject_HEAD_INIT(0) 0, /* Header */
625 "ECPt", /* @tp_name@ */
626 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
627 0, /* @tp_itemsize@ */
628
629 ecpt_pydealloc, /* @tp_dealloc@ */
630 0, /* @tp_print@ */
631 0, /* @tp_getattr@ */
632 0, /* @tp_setattr@ */
633 0, /* @tp_compare@ */
634 0, /* @tp_repr@ */
635 &ecpt_pynumber, /* @tp_as_number@ */
636 0, /* @tp_as_sequence@ */
637 0, /* @tp_as_mapping@ */
638 ecpt_pyhash, /* @tp_hash@ */
639 0, /* @tp_call@ */
640 0, /* @tp_str@ */
641 0, /* @tp_getattro@ */
642 0, /* @tp_setattro@ */
643 0, /* @tp_as_buffer@ */
644 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
645 Py_TPFLAGS_CHECKTYPES |
646 Py_TPFLAGS_BASETYPE,
647
648 /* @tp_doc@ */
649 "Elliptic curve points, not associated with any curve.",
650
651 0, /* @tp_traverse@ */
652 0, /* @tp_clear@ */
653 ecpt_pyrichcompare, /* @tp_richcompare@ */
654 0, /* @tp_weaklistoffset@ */
655 0, /* @tp_iter@ */
656 0, /* @tp_iternext@ */
657 ecptnc_pymethods, /* @tp_methods@ */
658 0, /* @tp_members@ */
659 ecptnc_pygetset, /* @tp_getset@ */
660 0, /* @tp_base@ */
661 0, /* @tp_dict@ */
662 0, /* @tp_descr_get@ */
663 0, /* @tp_descr_set@ */
664 0, /* @tp_dictoffset@ */
665 0, /* @tp_init@ */
666 PyType_GenericAlloc, /* @tp_alloc@ */
667 ecptnc_pynew, /* @tp_new@ */
668 0, /* @tp_free@ */
669 0 /* @tp_is_gc@ */
670 };
671
672 static PyGetSetDef ecpt_pygetset[] = {
673 #define GETSETNAME(op, name) ep##op##_##name
674 GET (curve, "P.curve -> elliptic curve containing P")
675 GET (point, "P.point -> standalone curve point")
676 GET (x, "P.x -> Cartesian x coordinate of P")
677 GET (y, "P.y -> Cartesian y coordinate of P")
678 GET (_x, "P._x -> internal x coordinate of P")
679 GET (_y, "P._y -> internal y coordinate of P")
680 GET (_z, "P._z -> internal z coordinate of P, or None")
681 #undef GETSETNAME
682 { 0 }
683 };
684
685 static PyMethodDef ecpt_pymethods[] = {
686 #define METHNAME(func) epmeth_##func
687 METH (toraw, "X.toraw() -> BIN")
688 KWMETH(ec2osp, "X.ec2osp([flags = EC_EXPLY]) -> BIN")
689 METH (dbl, "X.dbl() -> X + X")
690 METH (oncurvep, "X.oncurvep() -> BOOL")
691 #undef METHNAME
692 { 0 }
693 };
694
695 static PyNumberMethods ecptcurve_pynumber = {
696 ecpt_pyadd, /* @nb_add@ */
697 ecpt_pysub, /* @nb_subtract@ */
698 ecpt_pymul, /* @nb_multiply@ */
699 0, /* @nb_divide@ */
700 0, /* @nb_remainder@ */
701 0, /* @nb_divmod@ */
702 0, /* @nb_power@ */
703 ecpt_pyneg, /* @nb_negative@ */
704 ecpt_pyid, /* @nb_positive@ */
705 0, /* @nb_absolute@ */
706 0, /* @nb_nonzero@ */
707 0, /* @nb_invert@ */
708 0, /* @nb_lshift@ */
709 0, /* @nb_rshift@ */
710 0, /* @nb_and@ */
711 0, /* @nb_xor@ */
712 0, /* @nb_or@ */
713 0, /* @nb_coerce@ */
714 0, /* @nb_int@ */
715 0, /* @nb_long@ */
716 0, /* @nb_float@ */
717 0, /* @nb_oct@ */
718 0, /* @nb_hex@ */
719
720 0, /* @nb_inplace_add@ */
721 0, /* @nb_inplace_subtract@ */
722 0, /* @nb_inplace_multiply@ */
723 0, /* @nb_inplace_divide@ */
724 0, /* @nb_inplace_remainder@ */
725 0, /* @nb_inplace_power@ */
726 0, /* @nb_inplace_lshift@ */
727 0, /* @nb_inplace_rshift@ */
728 0, /* @nb_inplace_and@ */
729 0, /* @nb_inplace_xor@ */
730 0, /* @nb_inplace_or@ */
731
732 0, /* @nb_floor_divide@ */
733 0, /* @nb_true_divide@ */
734 0, /* @nb_inplace_floor_divide@ */
735 0, /* @nb_inplace_true_divide@ */
736 };
737
738 static PyTypeObject ecptcurve_pytype_skel = {
739 PyObject_HEAD_INIT(0) 0, /* Header */
740 "ECPtCurve", /* @tp_name@ */
741 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
742 0, /* @tp_itemsize@ */
743
744 ecpt_pydealloc, /* @tp_dealloc@ */
745 0, /* @tp_print@ */
746 0, /* @tp_getattr@ */
747 0, /* @tp_setattr@ */
748 0, /* @tp_compare@ */
749 0, /* @tp_repr@ */
750 &ecptcurve_pynumber, /* @tp_as_number@ */
751 0, /* @tp_as_sequence@ */
752 0, /* @tp_as_mapping@ */
753 0, /* @tp_hash@ */
754 0, /* @tp_call@ */
755 0, /* @tp_str@ */
756 0, /* @tp_getattro@ */
757 0, /* @tp_setattro@ */
758 0, /* @tp_as_buffer@ */
759 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
760 Py_TPFLAGS_CHECKTYPES |
761 Py_TPFLAGS_BASETYPE,
762
763 /* @tp_doc@ */
764 "Elliptic curve points; abstract base class for points on given curves.",
765
766 0, /* @tp_traverse@ */
767 0, /* @tp_clear@ */
768 0, /* @tp_richcompare@ */
769 0, /* @tp_weaklistoffset@ */
770 0, /* @tp_iter@ */
771 0, /* @tp_iternext@ */
772 ecpt_pymethods, /* @tp_methods@ */
773 0, /* @tp_members@ */
774 ecpt_pygetset, /* @tp_getset@ */
775 0, /* @tp_base@ */
776 0, /* @tp_dict@ */
777 0, /* @tp_descr_get@ */
778 0, /* @tp_descr_set@ */
779 0, /* @tp_dictoffset@ */
780 0, /* @tp_init@ */
781 PyType_GenericAlloc, /* @tp_alloc@ */
782 abstract_pynew, /* @tp_new@ */
783 0, /* @tp_free@ */
784 0 /* @tp_is_gc@ */
785 };
786
787 /*----- Elliptic curves themselves ----------------------------------------*/
788
789 static PyObject *eccurve_pyrichcompare(PyObject *x, PyObject *y, int op)
790 {
791 int b = ec_samep(ECCURVE_C(x), ECCURVE_C(y));
792 switch (op) {
793 case Py_EQ: break;
794 case Py_NE: b = !b; break;
795 default: TYERR("can't order elliptic curves");
796 }
797 return (getbool(b));
798 end:
799 return (0);
800 }
801
802 static PyObject *ecmmul_id(PyObject *me)
803 { ec p = EC_INIT; return (ecpt_pywrap(me, &p)); }
804
805 static int ecmmul_fill(void *pp, PyObject *me, PyObject *x, PyObject *m)
806 {
807 ec_mulfactor *f = pp;
808
809 EC_CREATE(&f->base);
810 if (getecpt(ECCURVE_C(me), &f->base, x) ||
811 (f->exp = getmp(m)) == 0)
812 return (-1);
813 return (0);
814 }
815
816 static PyObject *ecmmul_exp(PyObject *me, void *pp, int n)
817 {
818 ec p = EC_INIT;
819 ec_immul(ECCURVE_C(me), &p, pp, n);
820 return (ecpt_pywrap(me, &p));
821 }
822
823 static void ecmmul_drop(void *pp)
824 {
825 ec_mulfactor *f = pp;
826 EC_DESTROY(&f->base);
827 MP_DROP(f->exp);
828 }
829
830 static PyObject *ecmeth_mmul(PyObject *me, PyObject *arg)
831 {
832 return (mexp_common(me, arg, sizeof(ec_mulfactor),
833 ecmmul_id, ecmmul_fill, ecmmul_exp, ecmmul_drop));
834 }
835
836 static PyObject *meth__ECPtCurve_fromraw(PyObject *me, PyObject *arg)
837 {
838 char *p;
839 Py_ssize_t len;
840 buf b;
841 PyObject *rc = 0;
842 ec_curve *cc;
843 ec pp = EC_INIT;
844
845 if (!PyArg_ParseTuple(arg, "Os#:fromraw", &me, &p, &len))
846 return (0);
847 buf_init(&b, p, len);
848 cc = ECCURVE_C(me);
849 if (ec_getraw(cc, &b, &pp))
850 VALERR("bad point");
851 EC_IN(cc, &pp, &pp);
852 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
853 end:
854 return (rc);
855 }
856
857 static PyObject *meth__ECPtCurve_os2ecp(PyObject *me,
858 PyObject *arg, PyObject *kw)
859 {
860 char *p;
861 Py_ssize_t len;
862 buf b;
863 PyObject *rc = 0;
864 ec_curve *cc;
865 int f = EC_XONLY | EC_LSB | EC_SORT | EC_EXPLY;
866 ec pp = EC_INIT;
867 char *kwlist[] = { "buf", "flags", 0 };
868
869 if (!PyArg_ParseTupleAndKeywords(arg, kw, "Os#|f:os2ecp", kwlist,
870 &me, &p, &len, &f))
871 return (0);
872 buf_init(&b, p, len);
873 cc = ECCURVE_C(me);
874 if (ec_os2ecp(cc, f, &b, &pp)) VALERR("bad point");
875 EC_IN(cc, &pp, &pp);
876 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
877 end:
878 return (rc);
879 }
880
881 static PyObject *meth__ECPt_frombuf(PyObject *me, PyObject *arg)
882 {
883 buf b;
884 char *p;
885 Py_ssize_t sz;
886 PyObject *rc = 0;
887 ec pp = EC_INIT;
888
889 if (!PyArg_ParseTuple(arg, "Os#:frombuf", &me, &p, &sz)) goto end;
890 buf_init(&b, p, sz);
891 if (buf_getec(&b, &pp)) VALERR("malformed data");
892 rc = Py_BuildValue("(NN)", ecpt_pywrapout(me, &pp),
893 bytestring_pywrapbuf(&b));
894 end:
895 return (rc);
896 }
897
898 static PyObject *meth__ECPt_parse(PyObject *me, PyObject *arg)
899 {
900 char *p;
901 qd_parse qd;
902 PyObject *rc = 0;
903 ec pp = EC_INIT;
904
905 if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p)) goto end;
906 qd.p = p;
907 qd.e = 0;
908 if (!ec_ptparse(&qd, &pp)) VALERR(qd.e);
909 rc = Py_BuildValue("(Ns)", ecpt_pywrapout(me, &pp), qd.p);
910 end:
911 return (rc);
912 }
913
914 static void eccurve_pydealloc(PyObject *me)
915 {
916 ec_destroycurve(ECCURVE_C(me));
917 Py_DECREF(ECCURVE_FOBJ(me));
918 PyType_Type.tp_dealloc(me);
919 }
920
921 static PyObject *ecmeth_find(PyObject *me, PyObject *arg)
922 {
923 PyObject *x;
924 mp *xx = 0;
925 ec p = EC_INIT;
926 PyObject *rc = 0;
927
928 if (!PyArg_ParseTuple(arg, "O:find", &x)) goto end;
929 if (FIELD_PYCHECK(x) && FE_F(x) == ECCURVE_C(me)->f)
930 xx = MP_COPY(FE_X(x));
931 else if ((xx = getmp(x)) == 0)
932 goto end;
933 else
934 xx = F_IN(ECCURVE_C(me)->f, xx, xx);
935 if (EC_FIND(ECCURVE_C(me), &p, xx) == 0)
936 VALERR("not on the curve");
937 rc = ecpt_pywrap(me, &p);
938 end:
939 if (xx) MP_DROP(xx);
940 return (rc);
941 }
942
943 static PyObject *ecmeth_rand(PyObject *me, PyObject *arg, PyObject *kw)
944 {
945 char *kwlist[] = { "rng", 0 };
946 grand *r = &rand_global;
947 ec p = EC_INIT;
948
949 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:rand", kwlist,
950 convgrand, &r))
951 return (0);
952 ec_rand(ECCURVE_C(me), &p, r);
953 EC_IN(ECCURVE_C(me), &p, &p);
954 return (ecpt_pywrap(me, &p));
955 }
956
957 static PyObject *eccurve_dopywrap(PyTypeObject *ty,
958 PyObject *fobj, ec_curve *c)
959 {
960 eccurve_pyobj *cobj = newtype(ty, 0, c->ops->name);
961 cobj->c = c;
962 cobj->fobj = fobj;
963 cobj->ty.ht_type.tp_basicsize = sizeof(ecpt_pyobj);
964 cobj->ty.ht_type.tp_base = ecptcurve_pytype;
965 Py_INCREF(ecptcurve_pytype);
966 cobj->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
967 Py_TPFLAGS_BASETYPE |
968 Py_TPFLAGS_CHECKTYPES |
969 Py_TPFLAGS_HEAPTYPE);
970 cobj->ty.ht_type.tp_alloc = PyType_GenericAlloc;
971 cobj->ty.ht_type.tp_free = 0;
972 cobj->ty.ht_type.tp_new = ecpt_pynew;
973 typeready(&cobj->ty.ht_type);
974 return ((PyObject *)cobj);
975 }
976
977 PyObject *eccurve_pywrap(PyObject *fobj, ec_curve *c)
978 {
979 PyTypeObject *ty;
980
981 if (!fobj)
982 fobj = field_pywrap(c->f);
983 else
984 Py_INCREF(fobj);
985 assert(FIELD_F(fobj) == c->f);
986 if (strcmp(EC_NAME(c), "prime") == 0)
987 ty = ecprimecurve_pytype;
988 else if (strcmp(EC_NAME(c), "primeproj") == 0)
989 ty = ecprimeprojcurve_pytype;
990 else if (strcmp(EC_NAME(c), "bin") == 0)
991 ty = ecbincurve_pytype;
992 else if (strcmp(EC_NAME(c), "binproj") == 0)
993 ty = ecbinprojcurve_pytype;
994 else
995 abort();
996 return (eccurve_dopywrap(ty, fobj, c));
997 }
998
999 static PyObject *eccurve_pynew(PyTypeObject *ty,
1000 ec_curve *(*make)(field *, mp *, mp *),
1001 PyObject *arg, PyObject *kw)
1002 {
1003 PyObject *fobj;
1004 PyObject *cobj = 0;
1005 char *kwlist[] = { "field", "a", "b", 0 };
1006 mp *aa = 0, *bb = 0;
1007
1008 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O&O&", kwlist,
1009 field_pytype, &fobj,
1010 convmp, &aa, convmp, &bb))
1011 goto end;
1012 Py_INCREF(fobj);
1013 cobj = eccurve_dopywrap(ty, fobj, make(FIELD_F(fobj), aa, bb));
1014 end:
1015 if (aa) MP_DROP(aa);
1016 if (bb) MP_DROP(bb);
1017 return (cobj);
1018 }
1019
1020 static PyObject *meth__ECCurve_parse(PyObject *me, PyObject *arg)
1021 {
1022 char *p;
1023 qd_parse qd;
1024 ec_curve *c;
1025 PyObject *rc = 0;
1026
1027 if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p))
1028 goto end;
1029 qd.p = p;
1030 qd.e = 0;
1031 if ((c = ec_curveparse(&qd)) == 0)
1032 VALERR(qd.e);
1033 rc = eccurve_pywrap(0, c);
1034 end:
1035 return (rc);
1036 }
1037
1038 static PyObject *ecget_name(PyObject *me, void *hunoz)
1039 { return (PyString_FromString(EC_NAME(ECCURVE_C(me)))); }
1040
1041 static PyObject *ecget_a(PyObject *me, void *hunoz)
1042 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->a))); }
1043
1044 static PyObject *ecget_b(PyObject *me, void *hunoz)
1045 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->b))); }
1046
1047 static PyObject *ecget_field(PyObject *me, void *hunoz)
1048 { RETURN_OBJ(ECCURVE_FOBJ(me)); }
1049
1050 static PyObject *ecget_inf(PyObject *me, void *hunoz)
1051 { ec inf = EC_INIT; return (ecpt_pywrap(me, &inf)); }
1052
1053 static PyGetSetDef eccurve_pygetset[] = {
1054 #define GETSETNAME(op, name) ec##op##_##name
1055 GET (name, "E.name -> name of this kind of curve")
1056 GET (a, "E.a -> first parameter of curve")
1057 GET (b, "E.b -> second parameter of curve")
1058 GET (field, "E.field -> finite field containing this curve")
1059 GET (inf, "E.inf -> point at infinity of this curve")
1060 #undef GETSETNAME
1061 { 0 }
1062 };
1063
1064 static PyMethodDef eccurve_pymethods[] = {
1065 #define METHNAME(name) ecmeth_##name
1066 METH (mmul, "\
1067 E.mmul([(P0, N0), (P1, N1), ...]) = N0 P0 + N1 P1 + ...")
1068 METH (find, "E.find(X) -> P")
1069 KWMETH(rand, "E.rand(rng = rand) ->P")
1070 #undef METHNAME
1071 { 0 }
1072 };
1073
1074 static PyTypeObject eccurve_pytype_skel = {
1075 PyObject_HEAD_INIT(0) 0, /* Header */
1076 "ECCurve", /* @tp_name@ */
1077 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1078 0, /* @tp_itemsize@ */
1079
1080 eccurve_pydealloc, /* @tp_dealloc@ */
1081 0, /* @tp_print@ */
1082 0, /* @tp_getattr@ */
1083 0, /* @tp_setattr@ */
1084 0, /* @tp_compare@ */
1085 0, /* @tp_repr@ */
1086 0, /* @tp_as_number@ */
1087 0, /* @tp_as_sequence@ */
1088 0, /* @tp_as_mapping@ */
1089 0, /* @tp_hash@ */
1090 0, /* @tp_call@ */
1091 0, /* @tp_str@ */
1092 0, /* @tp_getattro@ */
1093 0, /* @tp_setattro@ */
1094 0, /* @tp_as_buffer@ */
1095 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1096 Py_TPFLAGS_BASETYPE,
1097
1098 /* @tp_doc@ */
1099 "An elliptic curve. Abstract class.",
1100
1101 0, /* @tp_traverse@ */
1102 0, /* @tp_clear@ */
1103 eccurve_pyrichcompare, /* @tp_richcompare@ */
1104 0, /* @tp_weaklistoffset@ */
1105 0, /* @tp_iter@ */
1106 0, /* @tp_iternext@ */
1107 eccurve_pymethods, /* @tp_methods@ */
1108 0, /* @tp_members@ */
1109 eccurve_pygetset, /* @tp_getset@ */
1110 0, /* @tp_base@ */
1111 0, /* @tp_dict@ */
1112 0, /* @tp_descr_get@ */
1113 0, /* @tp_descr_set@ */
1114 0, /* @tp_dictoffset@ */
1115 0, /* @tp_init@ */
1116 PyType_GenericAlloc, /* @tp_alloc@ */
1117 abstract_pynew, /* @tp_new@ */
1118 0, /* @tp_free@ */
1119 0 /* @tp_is_gc@ */
1120 };
1121
1122 static PyObject *ecprimecurve_pynew(PyTypeObject *ty,
1123 PyObject *arg, PyObject *kw)
1124 {
1125 return (eccurve_pynew(ty, ec_prime, arg, kw));
1126 }
1127
1128 static PyTypeObject ecprimecurve_pytype_skel = {
1129 PyObject_HEAD_INIT(0) 0, /* Header */
1130 "ECPrimeCurve", /* @tp_name@ */
1131 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1132 0, /* @tp_itemsize@ */
1133
1134 eccurve_pydealloc, /* @tp_dealloc@ */
1135 0, /* @tp_print@ */
1136 0, /* @tp_getattr@ */
1137 0, /* @tp_setattr@ */
1138 0, /* @tp_compare@ */
1139 0, /* @tp_repr@ */
1140 0, /* @tp_as_number@ */
1141 0, /* @tp_as_sequence@ */
1142 0, /* @tp_as_mapping@ */
1143 0, /* @tp_hash@ */
1144 0, /* @tp_call@ */
1145 0, /* @tp_str@ */
1146 0, /* @tp_getattro@ */
1147 0, /* @tp_setattro@ */
1148 0, /* @tp_as_buffer@ */
1149 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1150 Py_TPFLAGS_BASETYPE,
1151
1152 /* @tp_doc@ */
1153 "An elliptic curve over a prime field. Use ecprimeprojcurve.",
1154
1155 0, /* @tp_traverse@ */
1156 0, /* @tp_clear@ */
1157 eccurve_pyrichcompare, /* @tp_richcompare@ */
1158 0, /* @tp_weaklistoffset@ */
1159 0, /* @tp_iter@ */
1160 0, /* @tp_iternext@ */
1161 0, /* @tp_methods@ */
1162 0, /* @tp_members@ */
1163 0, /* @tp_getset@ */
1164 0, /* @tp_base@ */
1165 0, /* @tp_dict@ */
1166 0, /* @tp_descr_get@ */
1167 0, /* @tp_descr_set@ */
1168 0, /* @tp_dictoffset@ */
1169 0, /* @tp_init@ */
1170 PyType_GenericAlloc, /* @tp_alloc@ */
1171 ecprimecurve_pynew, /* @tp_new@ */
1172 0, /* @tp_free@ */
1173 0 /* @tp_is_gc@ */
1174 };
1175
1176 static PyObject *ecprimeprojcurve_pynew(PyTypeObject *ty,
1177 PyObject *arg, PyObject *kw)
1178 {
1179 return (eccurve_pynew(ty, ec_primeproj, arg, kw));
1180 }
1181
1182 static PyTypeObject ecprimeprojcurve_pytype_skel = {
1183 PyObject_HEAD_INIT(0) 0, /* Header */
1184 "ECPrimeProjCurve", /* @tp_name@ */
1185 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1186 0, /* @tp_itemsize@ */
1187
1188 eccurve_pydealloc, /* @tp_dealloc@ */
1189 0, /* @tp_print@ */
1190 0, /* @tp_getattr@ */
1191 0, /* @tp_setattr@ */
1192 0, /* @tp_compare@ */
1193 0, /* @tp_repr@ */
1194 0, /* @tp_as_number@ */
1195 0, /* @tp_as_sequence@ */
1196 0, /* @tp_as_mapping@ */
1197 0, /* @tp_hash@ */
1198 0, /* @tp_call@ */
1199 0, /* @tp_str@ */
1200 0, /* @tp_getattro@ */
1201 0, /* @tp_setattro@ */
1202 0, /* @tp_as_buffer@ */
1203 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1204 Py_TPFLAGS_BASETYPE,
1205
1206 /* @tp_doc@ */
1207 "An elliptic curve over a prime field, using projective coordinates.",
1208
1209 0, /* @tp_traverse@ */
1210 0, /* @tp_clear@ */
1211 eccurve_pyrichcompare, /* @tp_richcompare@ */
1212 0, /* @tp_weaklistoffset@ */
1213 0, /* @tp_iter@ */
1214 0, /* @tp_iternext@ */
1215 0, /* @tp_methods@ */
1216 0, /* @tp_members@ */
1217 0, /* @tp_getset@ */
1218 0, /* @tp_base@ */
1219 0, /* @tp_dict@ */
1220 0, /* @tp_descr_get@ */
1221 0, /* @tp_descr_set@ */
1222 0, /* @tp_dictoffset@ */
1223 0, /* @tp_init@ */
1224 PyType_GenericAlloc, /* @tp_alloc@ */
1225 ecprimeprojcurve_pynew, /* @tp_new@ */
1226 0, /* @tp_free@ */
1227 0 /* @tp_is_gc@ */
1228 };
1229
1230 static PyObject *ecbincurve_pynew(PyTypeObject *ty,
1231 PyObject *arg, PyObject *kw)
1232 {
1233 return (eccurve_pynew(ty, ec_bin, arg, kw));
1234 }
1235
1236 static PyTypeObject ecbincurve_pytype_skel = {
1237 PyObject_HEAD_INIT(0) 0, /* Header */
1238 "ECBinCurve", /* @tp_name@ */
1239 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1240 0, /* @tp_itemsize@ */
1241
1242 eccurve_pydealloc, /* @tp_dealloc@ */
1243 0, /* @tp_print@ */
1244 0, /* @tp_getattr@ */
1245 0, /* @tp_setattr@ */
1246 0, /* @tp_compare@ */
1247 0, /* @tp_repr@ */
1248 0, /* @tp_as_number@ */
1249 0, /* @tp_as_sequence@ */
1250 0, /* @tp_as_mapping@ */
1251 0, /* @tp_hash@ */
1252 0, /* @tp_call@ */
1253 0, /* @tp_str@ */
1254 0, /* @tp_getattro@ */
1255 0, /* @tp_setattro@ */
1256 0, /* @tp_as_buffer@ */
1257 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1258 Py_TPFLAGS_BASETYPE,
1259
1260 /* @tp_doc@ */
1261 "An elliptic curve over a binary field. Use ecbinprojcurve.",
1262
1263 0, /* @tp_traverse@ */
1264 0, /* @tp_clear@ */
1265 eccurve_pyrichcompare, /* @tp_richcompare@ */
1266 0, /* @tp_weaklistoffset@ */
1267 0, /* @tp_iter@ */
1268 0, /* @tp_iternext@ */
1269 0, /* @tp_methods@ */
1270 0, /* @tp_members@ */
1271 0, /* @tp_getset@ */
1272 0, /* @tp_base@ */
1273 0, /* @tp_dict@ */
1274 0, /* @tp_descr_get@ */
1275 0, /* @tp_descr_set@ */
1276 0, /* @tp_dictoffset@ */
1277 0, /* @tp_init@ */
1278 PyType_GenericAlloc, /* @tp_alloc@ */
1279 ecbincurve_pynew, /* @tp_new@ */
1280 0, /* @tp_free@ */
1281 0 /* @tp_is_gc@ */
1282 };
1283
1284 static PyObject *ecbinprojcurve_pynew(PyTypeObject *ty,
1285 PyObject *arg, PyObject *kw)
1286 {
1287 return (eccurve_pynew(ty, ec_binproj, arg, kw));
1288 }
1289
1290 static PyTypeObject ecbinprojcurve_pytype_skel = {
1291 PyObject_HEAD_INIT(0) 0, /* Header */
1292 "ECBinProjCurve", /* @tp_name@ */
1293 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1294 0, /* @tp_itemsize@ */
1295
1296 eccurve_pydealloc, /* @tp_dealloc@ */
1297 0, /* @tp_print@ */
1298 0, /* @tp_getattr@ */
1299 0, /* @tp_setattr@ */
1300 0, /* @tp_compare@ */
1301 0, /* @tp_repr@ */
1302 0, /* @tp_as_number@ */
1303 0, /* @tp_as_sequence@ */
1304 0, /* @tp_as_mapping@ */
1305 0, /* @tp_hash@ */
1306 0, /* @tp_call@ */
1307 0, /* @tp_str@ */
1308 0, /* @tp_getattro@ */
1309 0, /* @tp_setattro@ */
1310 0, /* @tp_as_buffer@ */
1311 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1312 Py_TPFLAGS_BASETYPE,
1313
1314 /* @tp_doc@ */
1315 "An elliptic curve over a binary field, using projective coordinates.",
1316
1317 0, /* @tp_traverse@ */
1318 0, /* @tp_clear@ */
1319 eccurve_pyrichcompare, /* @tp_richcompare@ */
1320 0, /* @tp_weaklistoffset@ */
1321 0, /* @tp_iter@ */
1322 0, /* @tp_iternext@ */
1323 0, /* @tp_methods@ */
1324 0, /* @tp_members@ */
1325 0, /* @tp_getset@ */
1326 0, /* @tp_base@ */
1327 0, /* @tp_dict@ */
1328 0, /* @tp_descr_get@ */
1329 0, /* @tp_descr_set@ */
1330 0, /* @tp_dictoffset@ */
1331 0, /* @tp_init@ */
1332 PyType_GenericAlloc, /* @tp_alloc@ */
1333 ecbinprojcurve_pynew, /* @tp_new@ */
1334 0, /* @tp_free@ */
1335 0 /* @tp_is_gc@ */
1336 };
1337
1338 /*----- Curve info --------------------------------------------------------*/
1339
1340 static int ncurves = -1;
1341
1342 void ecinfo_copy(ec_info *eic, const ec_info *ei)
1343 {
1344 eic->c = eccurve_copy(ei->c);
1345 EC_CREATE(&eic->g);
1346 EC_COPY(&eic->g, &ei->g);
1347 eic->r = MP_COPY(ei->r);
1348 eic->h = MP_COPY(ei->h);
1349 }
1350
1351 PyObject *ecinfo_pywrap(ec_info *ei)
1352 {
1353 ecinfo_pyobj *o;
1354
1355 o = PyObject_NEW(ecinfo_pyobj, ecinfo_pytype);
1356 o->ei = *ei;
1357 o->cobj = eccurve_pywrap(0, o->ei.c);
1358 Py_INCREF(o->cobj);
1359 return ((PyObject *)o);
1360 }
1361
1362 static void ecinfo_pydealloc(PyObject *me)
1363 {
1364 ec_info *ei = ECINFO_EI(me);
1365 EC_DESTROY(&ei->g);
1366 MP_DROP(ei->r);
1367 MP_DROP(ei->h);
1368 Py_DECREF(ECINFO_COBJ(me));
1369 FREEOBJ(me);
1370 }
1371
1372 static PyObject *ecinfo_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
1373 {
1374 ec_info ei = { 0 };
1375 PyObject *e, *g;
1376 char *kwlist[] = { "curve", "G", "r", "h", 0 };
1377 ecinfo_pyobj *rc = 0;
1378
1379 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O!O&O&:new", kwlist,
1380 eccurve_pytype, &e, ecpt_pytype, &g,
1381 convmp, &ei.r, convmp, &ei.h))
1382 goto end;
1383 if (ECPT_C(g) != ECCURVE_C(e) && !ec_samep(ECPT_C(g), ECCURVE_C(e)))
1384 TYERR("point not from this curve");
1385 ei.c = ECCURVE_C(e);
1386 EC_CREATE(&ei.g);
1387 EC_OUT(ei.c, &ei.g, ECPT_P(g));
1388 rc = (ecinfo_pyobj *)ty->tp_alloc(ty, 0);
1389 rc->ei = ei;
1390 rc->cobj = e;
1391 Py_INCREF(rc->cobj);
1392 return ((PyObject *)rc);
1393
1394 end:
1395 mp_drop(ei.r);
1396 mp_drop(ei.h);
1397 return (0);
1398 }
1399
1400 static PyObject *meth__ECInfo_parse(PyObject *me, PyObject *arg)
1401 {
1402 char *p;
1403 qd_parse qd;
1404 ec_info ei;
1405 PyObject *rc = 0;
1406
1407 if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p))
1408 goto end;
1409 qd.p = p;
1410 qd.e = 0;
1411 if (ec_infoparse(&qd, &ei))
1412 VALERR(qd.e);
1413 rc = Py_BuildValue("(Ns)", ecinfo_pywrap(&ei), qd.p);
1414 end:
1415 return (rc);
1416 }
1417
1418 static PyObject *meth__ECInfo__curven(PyObject *me, PyObject *arg)
1419 {
1420 int i;
1421 ec_info ei;
1422 PyObject *rc = 0;
1423
1424 if (!PyArg_ParseTuple(arg, "Oi:_curven", &me, &i)) goto end;
1425 if (i < 0 || i >= ncurves) VALERR("curve index out of range");
1426 ec_infofromdata(&ei, ectab[i].data);
1427 rc = ecinfo_pywrap(&ei);
1428 end:
1429 return (rc);
1430 }
1431
1432 static PyObject *ecinfo_pyrichcompare(PyObject *x, PyObject *y, int op)
1433 {
1434 int b = ec_sameinfop(ECINFO_EI(x), ECINFO_EI(y));
1435 switch (op) {
1436 case Py_EQ: break;
1437 case Py_NE: b = !b;
1438 default: TYERR("can't order elliptic curve infos");
1439 }
1440 return (getbool(b));
1441 end:
1442 return (0);
1443 }
1444
1445 static PyObject *eimeth_check(PyObject *me, PyObject *arg, PyObject *kw)
1446 {
1447 char *kwlist[] = { "rng", 0 };
1448 grand *r = &rand_global;
1449 const char *p;
1450
1451 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:check", kwlist,
1452 convgrand, &r))
1453 goto end;
1454 if ((p = ec_checkinfo(ECINFO_EI(me), r)) != 0)
1455 VALERR(p);
1456 RETURN_ME;
1457 end:
1458 return (0);
1459 }
1460
1461 static PyObject *eiget_curve(PyObject *me, void *hunoz)
1462 { RETURN_OBJ(ECINFO_COBJ(me)); }
1463
1464 static PyObject *eiget_G(PyObject *me, void *hunoz)
1465 {
1466 ec_info *ei = ECINFO_EI(me);
1467 ec p = EC_INIT;
1468 EC_IN(ei->c, &p, &ei->g);
1469 return (ecpt_pywrap(ECINFO_COBJ(me), &p));
1470 }
1471
1472 static PyObject *eiget_r(PyObject *me, void *hunoz)
1473 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->r))); }
1474
1475 static PyObject *eiget_h(PyObject *me, void *hunoz)
1476 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->h))); }
1477
1478 static PyGetSetDef ecinfo_pygetset[] = {
1479 #define GETSETNAME(op, name) ei##op##_##name
1480 GET (curve, "I.curve -> the elliptic curve")
1481 GET (G, "I.G -> generator point for the group")
1482 GET (r, "I.r -> order of the group (and hence of G")
1483 GET (h, "I.h -> cofactor of the group")
1484 #undef GETSETNAME
1485 { 0 }
1486 };
1487
1488 static PyMethodDef ecinfo_pymethods[] = {
1489 #define METHNAME(name) eimeth_##name
1490 KWMETH(check, "I.check() -> None")
1491 #undef METHNAME
1492 { 0 }
1493 };
1494
1495 static PyTypeObject ecinfo_pytype_skel = {
1496 PyObject_HEAD_INIT(0) 0, /* Header */
1497 "ECInfo", /* @tp_name@ */
1498 sizeof(ecinfo_pyobj), /* @tp_basicsize@ */
1499 0, /* @tp_itemsize@ */
1500
1501 ecinfo_pydealloc, /* @tp_dealloc@ */
1502 0, /* @tp_print@ */
1503 0, /* @tp_getattr@ */
1504 0, /* @tp_setattr@ */
1505 0, /* @tp_compare@ */
1506 0, /* @tp_repr@ */
1507 0, /* @tp_as_number@ */
1508 0, /* @tp_as_sequence@ */
1509 0, /* @tp_as_mapping@ */
1510 0, /* @tp_hash@ */
1511 0, /* @tp_call@ */
1512 0, /* @tp_str@ */
1513 0, /* @tp_getattro@ */
1514 0, /* @tp_setattro@ */
1515 0, /* @tp_as_buffer@ */
1516 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1517 Py_TPFLAGS_BASETYPE,
1518
1519 /* @tp_doc@ */
1520 "Elliptic curve domain parameters.",
1521
1522 0, /* @tp_traverse@ */
1523 0, /* @tp_clear@ */
1524 ecinfo_pyrichcompare, /* @tp_richcompare@ */
1525 0, /* @tp_weaklistoffset@ */
1526 0, /* @tp_iter@ */
1527 0, /* @tp_iternext@ */
1528 ecinfo_pymethods, /* @tp_methods@ */
1529 0, /* @tp_members@ */
1530 ecinfo_pygetset, /* @tp_getset@ */
1531 0, /* @tp_base@ */
1532 0, /* @tp_dict@ */
1533 0, /* @tp_descr_get@ */
1534 0, /* @tp_descr_set@ */
1535 0, /* @tp_dictoffset@ */
1536 0, /* @tp_init@ */
1537 PyType_GenericAlloc, /* @tp_alloc@ */
1538 ecinfo_pynew, /* @tp_new@ */
1539 0, /* @tp_free@ */
1540 0 /* @tp_is_gc@ */
1541 };
1542
1543 /*----- Setup -------------------------------------------------------------*/
1544
1545 static PyMethodDef methods[] = {
1546 #define METHNAME(func) meth_##func
1547 METH (_ECPt_frombuf, "frombuf(E, STR) -> (P, REST)")
1548 METH (_ECPtCurve_fromraw, "fromraw(E, STR) -> (P, REST)")
1549 KWMETH(_ECPtCurve_os2ecp, "os2ecp(E, STR, [flags = ...]) -> (P, REST)")
1550 METH (_ECPt_parse, "parse(E, STR) -> (P, REST)")
1551 METH (_ECCurve_parse, "parse(STR) -> (E, REST)")
1552 METH (_ECInfo_parse, "parse(STR) -> (I, REST)")
1553 METH (_ECInfo__curven, "_curven(N) -> I")
1554 #undef METHNAME
1555 { 0 }
1556 };
1557
1558 void ec_pyinit(void)
1559 {
1560 INITTYPE(ecpt, root);
1561 INITTYPE(ecptcurve, ecpt);
1562 INITTYPE(eccurve, type);
1563 INITTYPE(ecprimecurve, eccurve);
1564 INITTYPE(ecprimeprojcurve, ecprimecurve);
1565 INITTYPE(ecbincurve, eccurve);
1566 INITTYPE(ecbinprojcurve, ecbincurve);
1567 INITTYPE(ecinfo, root);
1568 addmethods(methods);
1569 }
1570
1571 static PyObject *namedcurves(void)
1572 {
1573 int i, j;
1574 const char *p;
1575 PyObject *d, *c;
1576
1577 d = PyDict_New();
1578 for (i = 0; ectab[i].name; i++) {
1579 p = ectab[i].name;
1580 for (j = 0; j < i; j++) {
1581 if (ectab[i].data == ectab[j].data) {
1582 c = PyDict_GetItemString(d, (/*unconst*/ char *)ectab[j].name);
1583 Py_INCREF(c);
1584 goto found;
1585 }
1586 }
1587 c = PyInt_FromLong(i);
1588 found:
1589 PyDict_SetItemString(d, (/*unconst*/ char *)p, c);
1590 Py_DECREF(c);
1591 }
1592 ncurves = i;
1593 return (d);
1594 }
1595
1596 void ec_pyinsert(PyObject *mod)
1597 {
1598 INSERT("ECPt", ecpt_pytype);
1599 INSERT("ECPtCurve", ecptcurve_pytype);
1600 INSERT("ECCurve", eccurve_pytype);
1601 INSERT("ECPrimeCurve", ecprimecurve_pytype);
1602 INSERT("ECPrimeProjCurve", ecprimeprojcurve_pytype);
1603 INSERT("ECBinCurve", ecbincurve_pytype);
1604 INSERT("ECBinProjCurve", ecbinprojcurve_pytype);
1605 INSERT("ECInfo", ecinfo_pytype);
1606 INSERT("_eccurves", namedcurves());
1607 }
1608
1609 /*----- That's all, folks -------------------------------------------------*/
Catacomb cryptographic library -- Python bindings