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*.c: Rearrange and reformat the class methods.
[catacomb-python] / ec.c
1 /* -*-c-*-
2 *
3 * Elliptic curves
4 *
5 * (c) 2004 Straylight/Edgeware
6 */
7
8 /*----- Licensing notice --------------------------------------------------*
9 *
10 * This file is part of the Python interface to Catacomb.
11 *
12 * Catacomb/Python is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * Catacomb/Python is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with Catacomb/Python; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 */
26
27 /*----- Header files ------------------------------------------------------*/
28
29 #include "catacomb-python.h"
30
31 /*----- Utility functions -------------------------------------------------*/
32
33 PyTypeObject *ecpt_pytype;
34 PyTypeObject *ecptcurve_pytype;
35 PyTypeObject *eccurve_pytype;
36 PyTypeObject *ecprimecurve_pytype;
37 PyTypeObject *ecprimeprojcurve_pytype;
38 PyTypeObject *ecbincurve_pytype;
39 PyTypeObject *ecbinprojcurve_pytype;
40 PyTypeObject *ecinfo_pytype;
41
42 ec_curve *eccurve_copy(ec_curve *c)
43 {
44 field *f;
45 mp *a, *b;
46
47 if ((f = field_copy(c->f)) == 0)
48 return (0);
49 a = F_OUT(f, MP_NEW, c->a);
50 b = F_OUT(f, MP_NEW, c->b);
51 if (STRCMP(EC_NAME(c), ==, "prime"))
52 c = ec_prime(f, a, b);
53 else if (STRCMP(EC_NAME(c), ==, "primeproj"))
54 c = ec_primeproj(f, a, b);
55 else if (STRCMP(EC_NAME(c), ==, "bin"))
56 c = ec_bin(f, a, b);
57 else if (STRCMP(EC_NAME(c), ==, "binproj"))
58 c = ec_binproj(f, a, b);
59 else
60 c = 0;
61 MP_DROP(a);
62 MP_DROP(b);
63 if (!c) F_DESTROY(f);
64 return (c);
65 }
66
67 static PyObject *ecpt_dopywrap(PyObject *cobj, ec_curve *c, ec *p)
68 {
69 ecpt_pyobj *z = PyObject_New(ecpt_pyobj, (PyTypeObject *)cobj);
70 z->p = *p;
71 z->c = c;
72 Py_INCREF(cobj);
73 return ((PyObject *)z);
74 }
75
76 PyObject *ecpt_pywrap(PyObject *cobj, ec *p)
77 { return (ecpt_dopywrap(cobj, ECCURVE_C(cobj), p)); }
78
79 PyObject *ecpt_pywrapout(void *cobj, ec *p)
80 {
81 ec_curve *c;
82
83 if (!PyType_IsSubtype(cobj, ecptcurve_pytype))
84 c = 0;
85 else {
86 c = ECCURVE_C(cobj);
87 EC_IN(ECCURVE_C(cobj), p, p);
88 }
89 return (ecpt_dopywrap(cobj, c, p));
90 }
91
92 int toecpt(ec_curve *c, ec *d, PyObject *p)
93 {
94 if (ECPTCURVE_PYCHECK(p)) {
95 if (ECPT_C(p) != c && !ec_samep(ECPT_C(p), c))
96 return (-1);
97 EC_COPY(d, ECPT_P(p));
98 } else if (ECPT_PYCHECK(p))
99 EC_IN(c, d, ECPT_P(p));
100 else
101 return (-1);
102 return (0);
103 }
104
105 int getecpt(ec_curve *c, ec *d, PyObject *p)
106 {
107 if (toecpt(c, d, p)) {
108 PyErr_Format(PyExc_TypeError, "can't convert %.100s to ecpt",
109 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 ec p = EC_INIT;
199
200 getecptout(&p, me);
201 if (EC_ATINF(&p)) h = 0x81d81a94;
202 else h = 0xe0fdd039 ^ (2*mphash(p.x)) ^ (3*mphash(p.y));
203 EC_DESTROY(&p);
204 return (h%LONG_MAX);
205 }
206
207 static PyObject *ecpt_pyrichcompare(PyObject *x, PyObject *y, int op)
208 {
209 ec p = EC_INIT, q = EC_INIT;
210 int b;
211 PyObject *rc = 0;
212
213 if (!ECPT_PYCHECK(y)) RETURN_NOTIMPL;
214 getecptout(&p, x);
215 getecptout(&q, y);
216 switch (op) {
217 case Py_EQ: b = EC_EQ(&p, &q); break;
218 case Py_NE: b = !EC_EQ(&p, &q); break;
219 default: TYERR("elliptic curve points are unordered");
220 }
221 rc = getbool(b);
222 end:
223 EC_DESTROY(&p);
224 EC_DESTROY(&q);
225 return (rc);
226 }
227
228 static PyObject *epmeth_oncurvep(PyObject *me, PyObject *arg)
229 {
230 if (!PyArg_ParseTuple(arg, ":oncurvep")) return (0);
231 return (getbool(EC_ATINF(ECPT_P(me)) ||
232 !EC_CHECK(ECPT_C(me), ECPT_P(me))));
233 }
234
235 static PyObject *epmeth_dbl(PyObject *me, PyObject *arg)
236 {
237 ec p = EC_INIT;
238 if (!PyArg_ParseTuple(arg, ":dbl")) return (0);
239 EC_DBL(ECPT_C(me), &p, ECPT_P(me));
240 return (ecpt_pywrap(ECPT_COBJ(me), &p));
241 }
242
243 static PyObject *epmeth_tobuf(PyObject *me, PyObject *arg)
244 {
245 buf b;
246 ec p = EC_INIT;
247 PyObject *rc;
248 size_t n;
249
250 if (!PyArg_ParseTuple(arg, ":tobuf")) return (0);
251 getecptout(&p, me);
252 if (EC_ATINF(&p))
253 n = 2;
254 else
255 n = mp_octets(p.x) + mp_octets(p.y) + 6;
256 rc = bytestring_pywrap(0, n);
257 buf_init(&b, PyString_AS_STRING(rc), n);
258 buf_putec(&b, &p);
259 assert(BOK(&b));
260 _PyString_Resize(&rc, BLEN(&b));
261 EC_DESTROY(&p);
262 return (rc);
263 }
264
265 static PyObject *epmeth_toraw(PyObject *me, PyObject *arg)
266 {
267 buf b;
268 PyObject *rc;
269 char *p;
270 ec_curve *c = ECPT_C(me);
271 ec pp = EC_INIT;
272 int len;
273
274 if (!PyArg_ParseTuple(arg, ":toraw")) return (0);
275 len = c->f->noctets * 2 + 1;
276 rc = bytestring_pywrap(0, len);
277 p = PyString_AS_STRING(rc);
278 buf_init(&b, p, len);
279 EC_OUT(c, &pp, ECPT_P(me));
280 ec_putraw(c, &b, &pp);
281 EC_DESTROY(&pp);
282 _PyString_Resize(&rc, BLEN(&b));
283 return (rc);
284 }
285
286 static PyObject *epmeth_ec2osp(PyObject *me, PyObject *arg, PyObject *kw)
287 {
288 buf b;
289 PyObject *rc;
290 char *p;
291 ec_curve *c = ECPT_C(me);
292 ec pp = EC_INIT;
293 unsigned f = EC_EXPLY;
294 int len;
295 static const char *const kwlist[] = { "flags", 0 };
296
297 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:ec2osp", KWLIST,
298 convuint, &f))
299 return (0);
300 len = c->f->noctets * 2 + 1;
301 rc = bytestring_pywrap(0, len);
302 p = PyString_AS_STRING(rc);
303 buf_init(&b, p, len);
304 EC_OUT(c, &pp, ECPT_P(me));
305 if (ec_ec2osp(c, f, &b, &pp)) {
306 Py_DECREF(rc); rc = 0;
307 VALERR("invalid flags");
308 }
309 EC_DESTROY(&pp);
310 _PyString_Resize(&rc, BLEN(&b));
311 end:
312 return (rc);
313 }
314
315 static PyObject *epget_curve(PyObject *me, void *hunoz)
316 { RETURN_OBJ(ECPT_COBJ(me)); }
317
318 static PyObject *meth__ECPt_frombuf(PyObject *me, PyObject *arg)
319 {
320 buf b;
321 char *p;
322 Py_ssize_t sz;
323 PyObject *rc = 0;
324 ec pp = EC_INIT;
325
326 if (!PyArg_ParseTuple(arg, "Os#:frombuf", &me, &p, &sz)) goto end;
327 buf_init(&b, p, sz);
328 if (buf_getec(&b, &pp)) VALERR("malformed data");
329 rc = Py_BuildValue("(NN)", ecpt_pywrapout(me, &pp),
330 bytestring_pywrapbuf(&b));
331 end:
332 return (rc);
333 }
334
335 static PyObject *meth__ECPt_parse(PyObject *me, PyObject *arg)
336 {
337 char *p;
338 qd_parse qd;
339 PyObject *rc = 0;
340 ec pp = EC_INIT;
341
342 if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p)) goto end;
343 qd.p = p; qd.e = 0;
344 if (!ec_ptparse(&qd, &pp)) VALERR(qd.e);
345 rc = Py_BuildValue("(Ns)", ecpt_pywrapout(me, &pp), qd.p);
346 end:
347 return (rc);
348 }
349
350 static PyObject *meth__ECPtCurve_fromraw(PyObject *me, PyObject *arg)
351 {
352 char *p;
353 Py_ssize_t len;
354 buf b;
355 PyObject *rc = 0;
356 ec_curve *cc;
357 ec pp = EC_INIT;
358
359 if (!PyArg_ParseTuple(arg, "Os#:fromraw", &me, &p, &len))
360 return (0);
361 buf_init(&b, p, len);
362 cc = ECCURVE_C(me);
363 if (ec_getraw(cc, &b, &pp))
364 VALERR("bad point");
365 EC_IN(cc, &pp, &pp);
366 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
367 end:
368 return (rc);
369 }
370
371 static PyObject *meth__ECPtCurve_os2ecp(PyObject *me,
372 PyObject *arg, PyObject *kw)
373 {
374 char *p;
375 Py_ssize_t len;
376 buf b;
377 PyObject *rc = 0;
378 ec_curve *cc;
379 unsigned f = EC_XONLY | EC_LSB | EC_SORT | EC_EXPLY;
380 ec pp = EC_INIT;
381 static const char *const kwlist[] = { "class", "buf", "flags", 0 };
382
383 if (!PyArg_ParseTupleAndKeywords(arg, kw, "Os#|O&:os2ecp", KWLIST,
384 &me, &p, &len, convuint, &f))
385 return (0);
386 buf_init(&b, p, len);
387 cc = ECCURVE_C(me);
388 if (ec_os2ecp(cc, f, &b, &pp)) VALERR("bad point");
389 EC_IN(cc, &pp, &pp);
390 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
391 end:
392 return (rc);
393 }
394
395 static PyObject *epncget_ix(PyObject *me, void *hunoz)
396 {
397 ec p = EC_INIT;
398 PyObject *rc;
399 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
400 getecptout(&p, me);
401 rc = mp_pywrap(MP_COPY(p.x));
402 EC_DESTROY(&p);
403 return (rc);
404 }
405
406 static PyObject *epncget_iy(PyObject *me, void *hunoz)
407 {
408 ec p = EC_INIT;
409 PyObject *rc;
410 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
411 getecptout(&p, me);
412 rc = mp_pywrap(MP_COPY(p.y));
413 EC_DESTROY(&p);
414 return (rc);
415 }
416
417 static PyObject *epncget_point(PyObject *me, void *hunoz)
418 { RETURN_ME; }
419
420 static PyObject *epget_point(PyObject *me, void *hunoz)
421 {
422 ec p = EC_INIT;
423 getecptout(&p, me);
424 return (ecpt_pywrapout(ecpt_pytype, &p));
425 }
426
427 static PyObject *epget_x(PyObject *me, void *hunoz)
428 {
429 ec_curve *c = ECPT_C(me);
430 ec *pp = ECPT_P(me);
431 PyObject *fobj = ECPT_FOBJ(me);
432 ec p = EC_INIT;
433 PyObject *rc;
434
435 if (EC_ATINF(pp)) RETURN_NONE;
436 EC_OUT(c, &p, pp);
437 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.x));
438 EC_DESTROY(&p);
439 return (rc);
440 }
441
442 static PyObject *epget_y(PyObject *me, void *hunoz)
443 {
444 ec_curve *c = ECPT_C(me);
445 ec *pp = ECPT_P(me);
446 PyObject *fobj = ECPT_FOBJ(me);
447 ec p = EC_INIT;
448 PyObject *rc;
449
450 if (EC_ATINF(pp)) RETURN_NONE;
451 EC_OUT(c, &p, pp);
452 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.y));
453 EC_DESTROY(&p);
454 return (rc);
455 }
456
457 static PyObject *epget__x(PyObject *me, void *hunoz)
458 {
459 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
460 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->x)));
461 }
462
463 static PyObject *epget__y(PyObject *me, void *hunoz)
464 {
465 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
466 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->y)));
467 }
468
469 static PyObject *epget__z(PyObject *me, void *hunoz)
470 {
471 if (EC_ATINF(ECPT_P(me)) || !ECPT_P(me)->z) RETURN_NONE;
472 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->z)));
473 }
474
475 static mp *coord_in(field *f, PyObject *x)
476 {
477 mp *xx;
478 if (FE_PYCHECK(x) && FE_F(x) == f)
479 return (MP_COPY(FE_X(x)));
480 else if ((xx = getmp(x)) == 0)
481 return (0);
482 else
483 return (F_IN(f, xx, xx));
484 }
485
486 static int ecptxl_3(ec_curve *c, ec *p,
487 PyObject *x, PyObject *y, PyObject *z)
488 {
489 int rc = -1;
490
491 if (!x || !y || !z) TYERR("missing argument");
492 if (!c) VALERR("internal form with no curve!");
493 if ((p->x = coord_in(c->f, x)) == 0 ||
494 (p->y = coord_in(c->f, y)) == 0 ||
495 (z != Py_None && (p->z = coord_in(c->f, z)) == 0))
496 goto end;
497 if (!p->z) p->z = MP_COPY(c->f->one); /* just in case */
498 rc = 0;
499 end:
500 return (rc);
501 }
502
503 static int ecptxl_2(ec_curve *c, ec *p, PyObject *x, PyObject *y)
504 {
505 int rc = -1;
506
507 if (!x || !y) TYERR("missing argument");
508 if ((p->x = getmp(x)) == 0 ||
509 (p->y = getmp(y)) == 0)
510 goto end;
511 if (c) EC_IN(c, p, p);
512 rc = 0;
513 end:
514 return (rc);
515 }
516
517 static int ecptxl_1(ec_curve *c, ec *p, PyObject *x)
518 {
519 int rc = -1;
520 PyObject *y = 0, *z = 0, *t = 0;
521 mp *xx = 0;
522 const void *q;
523 Py_ssize_t n;
524 qd_parse qd;
525
526 Py_XINCREF(x);
527 if (!x || x == Py_None)
528 /*cool*/;
529 else if (ECPT_PYCHECK(x)) {
530 getecptout(p, x);
531 goto fix;
532 } else if (PyString_Check(x)) {
533 if (PyObject_AsReadBuffer(x, &q, &n))
534 goto end;
535 qd.p = q;
536 qd.e = 0;
537 if (!ec_ptparse(&qd, p))
538 VALERR(qd.e);
539 goto fix;
540 } else if (c && (xx = tomp(x)) != 0) {
541 xx = F_IN(c->f, xx, xx);
542 if (!EC_FIND(c, p, xx)) VALERR("not on the curve");
543 } else if (PySequence_Check(x)) {
544 t = x; x = 0;
545 n = PySequence_Size(t); if (n < 0) goto end;
546 if (n != 2 && (n != 3 || !c))
547 TYERR("want sequence of two or three items");
548 if ((x = PySequence_GetItem(t, 0)) == 0 ||
549 (y = PySequence_GetItem(t, 1)) == 0 ||
550 (n == 3 && (z = PySequence_GetItem(t, 2)) == 0))
551 goto end;
552 rc = (n == 2) ? ecptxl_2(c, p, x, y) : ecptxl_3(c, p, x, y, z);
553 goto end;
554 } else
555 TYERR("can't convert to curve point");
556 goto ok;
557
558 fix:
559 if (c) EC_IN(c, p, p);
560 ok:
561 rc = 0;
562 end:
563 Py_XDECREF(x); Py_XDECREF(y); Py_XDECREF(z); Py_XDECREF(t);
564 mp_drop(xx);
565 return (rc);
566 }
567
568 static int ecptxl(ec_curve *c, ec *p, PyObject *x, PyObject *y, PyObject *z)
569 {
570 if (z)
571 return (ecptxl_3(c, p, x, y, z));
572 else if (y)
573 return (ecptxl_2(c, p, x, y));
574 else
575 return (ecptxl_1(c, p, x));
576 }
577
578 static PyObject *ecptnc_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
579 {
580 PyObject *x = 0, *y = 0, *z = 0;
581 ec p = EC_INIT;
582 static const char *const kwlist[] = { "x", "y", 0 };
583
584 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OO:new", KWLIST, &x, &y) ||
585 ecptxl(0, &p, x, y, z))
586 goto end;
587 return (ecpt_pywrapout(ty, &p));
588 end:
589 mp_drop(p.x); mp_drop(p.y); mp_drop(p.z);
590 return (0);
591 }
592
593 static PyObject *ecpt_pyint(PyObject *me)
594 {
595 ec p = EC_INIT;
596 long l;
597 PyObject *rc = 0;
598 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
599 getecptout(&p, me);
600 if (!mp_tolong_checked(p.x, &l, 0)) rc = PyInt_FromLong(l);
601 else rc = mp_topylong(p.x);
602 end:
603 EC_DESTROY(&p);
604 return (rc);
605 }
606
607 static PyObject *ecpt_pylong(PyObject *me)
608 {
609 ec p = EC_INIT;
610 PyObject *rc = 0;
611 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
612 getecptout(&p, me);
613 rc = mp_topylong(p.x);
614 end:
615 EC_DESTROY(&p);
616 return (rc);
617 }
618
619 static PyObject *ecpt_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
620 {
621 PyObject *x = 0, *y = 0, *z = 0;
622 ec p = EC_INIT;
623 static const char *const kwlist[] = { "x", "y", "z", 0 };
624
625 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OOO:new", KWLIST,
626 &x, &y, &z) ||
627 ecptxl(ECCURVE_C(ty), &p, x, y, z))
628 goto end;
629 return (ecpt_pywrap((PyObject *)ty, &p));
630 end:
631 mp_drop(p.x); mp_drop(p.y); mp_drop(p.z);
632 return (0);
633 }
634
635 static const PyGetSetDef ecptnc_pygetset[] = {
636 #define GETSETNAME(op, name) epnc##op##_##name
637 GET (ix, "P.ix -> integer x coordinate of P")
638 GET (iy, "P.iy -> integer y coordinate of P")
639 GET (point, "P.point -> standalone curve point (no-op)")
640 #undef GETSETNAME
641 { 0 }
642 };
643
644 static const PyMethodDef ecptnc_pymethods[] = {
645 #define METHNAME(func) epmeth_##func
646 METH (tobuf, "X.tobuf() -> BIN")
647 #undef METHNAME
648 { 0 }
649 };
650
651 static const PyNumberMethods ecpt_pynumber = {
652 0, /* @nb_add@ */
653 0, /* @nb_subtract@ */
654 0, /* @nb_multiply@ */
655 0, /* @nb_divide@ */
656 0, /* @nb_remainder@ */
657 0, /* @nb_divmod@ */
658 0, /* @nb_power@ */
659 0, /* @nb_negative@ */
660 0, /* @nb_positive@ */
661 0, /* @nb_absolute@ */
662 ecpt_pynonzerop, /* @nb_nonzero@ */
663 0, /* @nb_invert@ */
664 0, /* @nb_lshift@ */
665 0, /* @nb_rshift@ */
666 0, /* @nb_and@ */
667 0, /* @nb_xor@ */
668 0, /* @nb_or@ */
669 0, /* @nb_coerce@ */
670 ecpt_pyint, /* @nb_int@ */
671 ecpt_pylong, /* @nb_long@ */
672 0, /* @nb_float@ */
673 0, /* @nb_oct@ */
674 0, /* @nb_hex@ */
675
676 0, /* @nb_inplace_add@ */
677 0, /* @nb_inplace_subtract@ */
678 0, /* @nb_inplace_multiply@ */
679 0, /* @nb_inplace_divide@ */
680 0, /* @nb_inplace_remainder@ */
681 0, /* @nb_inplace_power@ */
682 0, /* @nb_inplace_lshift@ */
683 0, /* @nb_inplace_rshift@ */
684 0, /* @nb_inplace_and@ */
685 0, /* @nb_inplace_xor@ */
686 0, /* @nb_inplace_or@ */
687
688 0, /* @nb_floor_divide@ */
689 0, /* @nb_true_divide@ */
690 0, /* @nb_inplace_floor_divide@ */
691 0, /* @nb_inplace_true_divide@ */
692 };
693
694 static PyTypeObject ecpt_pytype_skel = {
695 PyObject_HEAD_INIT(0) 0, /* Header */
696 "ECPt", /* @tp_name@ */
697 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
698 0, /* @tp_itemsize@ */
699
700 ecpt_pydealloc, /* @tp_dealloc@ */
701 0, /* @tp_print@ */
702 0, /* @tp_getattr@ */
703 0, /* @tp_setattr@ */
704 0, /* @tp_compare@ */
705 0, /* @tp_repr@ */
706 PYNUMBER(ecpt), /* @tp_as_number@ */
707 0, /* @tp_as_sequence@ */
708 0, /* @tp_as_mapping@ */
709 ecpt_pyhash, /* @tp_hash@ */
710 0, /* @tp_call@ */
711 0, /* @tp_str@ */
712 0, /* @tp_getattro@ */
713 0, /* @tp_setattro@ */
714 0, /* @tp_as_buffer@ */
715 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
716 Py_TPFLAGS_CHECKTYPES |
717 Py_TPFLAGS_BASETYPE,
718
719 /* @tp_doc@ */
720 "ECPt([X, [Y]]): elliptic curve points, not associated with any curve.\n"
721 " X alone may be None, an existing point, a string 'X, Y', an\n"
722 " x-coordinate, or a pair (X, Y); X and Y should be a coordinate pair.",
723
724 0, /* @tp_traverse@ */
725 0, /* @tp_clear@ */
726 ecpt_pyrichcompare, /* @tp_richcompare@ */
727 0, /* @tp_weaklistoffset@ */
728 0, /* @tp_iter@ */
729 0, /* @tp_iternext@ */
730 PYMETHODS(ecptnc), /* @tp_methods@ */
731 0, /* @tp_members@ */
732 PYGETSET(ecptnc), /* @tp_getset@ */
733 0, /* @tp_base@ */
734 0, /* @tp_dict@ */
735 0, /* @tp_descr_get@ */
736 0, /* @tp_descr_set@ */
737 0, /* @tp_dictoffset@ */
738 0, /* @tp_init@ */
739 PyType_GenericAlloc, /* @tp_alloc@ */
740 ecptnc_pynew, /* @tp_new@ */
741 0, /* @tp_free@ */
742 0 /* @tp_is_gc@ */
743 };
744
745 static const PyGetSetDef ecpt_pygetset[] = {
746 #define GETSETNAME(op, name) ep##op##_##name
747 GET (curve, "P.curve -> elliptic curve containing P")
748 GET (point, "P.point -> standalone curve point")
749 GET (x, "P.x -> Cartesian x coordinate of P")
750 GET (y, "P.y -> Cartesian y coordinate of P")
751 GET (_x, "P._x -> internal x coordinate of P")
752 GET (_y, "P._y -> internal y coordinate of P")
753 GET (_z, "P._z -> internal z coordinate of P, or None")
754 #undef GETSETNAME
755 { 0 }
756 };
757
758 static const PyMethodDef ecpt_pymethods[] = {
759 #define METHNAME(func) epmeth_##func
760 METH (toraw, "X.toraw() -> BIN")
761 KWMETH(ec2osp, "X.ec2osp([flags = EC_EXPLY]) -> BIN")
762 METH (dbl, "X.dbl() -> X + X")
763 METH (oncurvep, "X.oncurvep() -> BOOL")
764 #undef METHNAME
765 { 0 }
766 };
767
768 static const PyNumberMethods ecptcurve_pynumber = {
769 ecpt_pyadd, /* @nb_add@ */
770 ecpt_pysub, /* @nb_subtract@ */
771 ecpt_pymul, /* @nb_multiply@ */
772 0, /* @nb_divide@ */
773 0, /* @nb_remainder@ */
774 0, /* @nb_divmod@ */
775 0, /* @nb_power@ */
776 ecpt_pyneg, /* @nb_negative@ */
777 ecpt_pyid, /* @nb_positive@ */
778 0, /* @nb_absolute@ */
779 0, /* @nb_nonzero@ */
780 0, /* @nb_invert@ */
781 0, /* @nb_lshift@ */
782 0, /* @nb_rshift@ */
783 0, /* @nb_and@ */
784 0, /* @nb_xor@ */
785 0, /* @nb_or@ */
786 0, /* @nb_coerce@ */
787 0, /* @nb_int@ */
788 0, /* @nb_long@ */
789 0, /* @nb_float@ */
790 0, /* @nb_oct@ */
791 0, /* @nb_hex@ */
792
793 0, /* @nb_inplace_add@ */
794 0, /* @nb_inplace_subtract@ */
795 0, /* @nb_inplace_multiply@ */
796 0, /* @nb_inplace_divide@ */
797 0, /* @nb_inplace_remainder@ */
798 0, /* @nb_inplace_power@ */
799 0, /* @nb_inplace_lshift@ */
800 0, /* @nb_inplace_rshift@ */
801 0, /* @nb_inplace_and@ */
802 0, /* @nb_inplace_xor@ */
803 0, /* @nb_inplace_or@ */
804
805 0, /* @nb_floor_divide@ */
806 0, /* @nb_true_divide@ */
807 0, /* @nb_inplace_floor_divide@ */
808 0, /* @nb_inplace_true_divide@ */
809 };
810
811 static PyTypeObject ecptcurve_pytype_skel = {
812 PyObject_HEAD_INIT(0) 0, /* Header */
813 "ECPtCurve", /* @tp_name@ */
814 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
815 0, /* @tp_itemsize@ */
816
817 ecpt_pydealloc, /* @tp_dealloc@ */
818 0, /* @tp_print@ */
819 0, /* @tp_getattr@ */
820 0, /* @tp_setattr@ */
821 0, /* @tp_compare@ */
822 0, /* @tp_repr@ */
823 PYNUMBER(ecptcurve), /* @tp_as_number@ */
824 0, /* @tp_as_sequence@ */
825 0, /* @tp_as_mapping@ */
826 0, /* @tp_hash@ */
827 0, /* @tp_call@ */
828 0, /* @tp_str@ */
829 0, /* @tp_getattro@ */
830 0, /* @tp_setattro@ */
831 0, /* @tp_as_buffer@ */
832 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
833 Py_TPFLAGS_CHECKTYPES |
834 Py_TPFLAGS_BASETYPE,
835
836 /* @tp_doc@ */
837 "Elliptic curve points; abstract base class for points on given curves.",
838
839 0, /* @tp_traverse@ */
840 0, /* @tp_clear@ */
841 0, /* @tp_richcompare@ */
842 0, /* @tp_weaklistoffset@ */
843 0, /* @tp_iter@ */
844 0, /* @tp_iternext@ */
845 PYMETHODS(ecpt), /* @tp_methods@ */
846 0, /* @tp_members@ */
847 PYGETSET(ecpt), /* @tp_getset@ */
848 0, /* @tp_base@ */
849 0, /* @tp_dict@ */
850 0, /* @tp_descr_get@ */
851 0, /* @tp_descr_set@ */
852 0, /* @tp_dictoffset@ */
853 0, /* @tp_init@ */
854 PyType_GenericAlloc, /* @tp_alloc@ */
855 abstract_pynew, /* @tp_new@ */
856 0, /* @tp_free@ */
857 0 /* @tp_is_gc@ */
858 };
859
860 /*----- Elliptic curves themselves ----------------------------------------*/
861
862 static PyObject *eccurve_pyrichcompare(PyObject *x, PyObject *y, int op)
863 {
864 int b;
865
866 assert(ECCURVE_PYCHECK(x));
867 if (!ECCURVE_PYCHECK(y)) RETURN_NOTIMPL;
868 b = ec_samep(ECCURVE_C(x), ECCURVE_C(y));
869 switch (op) {
870 case Py_EQ: break;
871 case Py_NE: b = !b; break;
872 default: TYERR("can't order elliptic curves");
873 }
874 return (getbool(b));
875 end:
876 return (0);
877 }
878
879 static PyObject *ecmmul_id(PyObject *me)
880 { ec p = EC_INIT; return (ecpt_pywrap(me, &p)); }
881
882 static int ecmmul_fill(void *pp, PyObject *me, PyObject *x, PyObject *m)
883 {
884 ec_mulfactor *f = pp;
885
886 EC_CREATE(&f->base);
887 if (getecpt(ECCURVE_C(me), &f->base, x) ||
888 (f->exp = getmp(m)) == 0)
889 return (-1);
890 return (0);
891 }
892
893 static PyObject *ecmmul_exp(PyObject *me, void *pp, int n)
894 {
895 ec p = EC_INIT;
896 ec_immul(ECCURVE_C(me), &p, pp, n);
897 return (ecpt_pywrap(me, &p));
898 }
899
900 static void ecmmul_drop(void *pp)
901 {
902 ec_mulfactor *f = pp;
903 EC_DESTROY(&f->base);
904 MP_DROP(f->exp);
905 }
906
907 static PyObject *ecmeth_mmul(PyObject *me, PyObject *arg)
908 {
909 return (mexp_common(me, arg, sizeof(ec_mulfactor),
910 ecmmul_id, ecmmul_fill, ecmmul_exp, ecmmul_drop));
911 }
912
913 static void eccurve_pydealloc(PyObject *me)
914 {
915 ec_destroycurve(ECCURVE_C(me));
916 Py_DECREF(ECCURVE_FOBJ(me));
917 PyType_Type.tp_dealloc(me);
918 }
919
920 static PyObject *ecmeth_find(PyObject *me, PyObject *arg)
921 {
922 PyObject *x;
923 mp *xx = 0;
924 ec p = EC_INIT;
925 PyObject *rc = 0;
926
927 if (!PyArg_ParseTuple(arg, "O:find", &x)) goto end;
928 if (FIELD_PYCHECK(x) && FE_F(x) == ECCURVE_C(me)->f)
929 xx = MP_COPY(FE_X(x));
930 else if ((xx = getmp(x)) == 0)
931 goto end;
932 else
933 xx = F_IN(ECCURVE_C(me)->f, xx, xx);
934 if (EC_FIND(ECCURVE_C(me), &p, xx) == 0)
935 VALERR("not on the curve");
936 rc = ecpt_pywrap(me, &p);
937 end:
938 if (xx) MP_DROP(xx);
939 return (rc);
940 }
941
942 static PyObject *ecmeth_rand(PyObject *me, PyObject *arg, PyObject *kw)
943 {
944 static const char *const kwlist[] = { "rng", 0 };
945 grand *r = &rand_global;
946 ec p = EC_INIT;
947
948 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:rand", KWLIST,
949 convgrand, &r))
950 return (0);
951 ec_rand(ECCURVE_C(me), &p, r);
952 EC_IN(ECCURVE_C(me), &p, &p);
953 return (ecpt_pywrap(me, &p));
954 }
955
956 static PyObject *meth__ECCurve_parse(PyObject *me, PyObject *arg)
957 {
958 char *p;
959 qd_parse qd;
960 ec_curve *c;
961 PyObject *rc = 0;
962
963 if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p)) goto end;
964 qd.p = p; qd.e = 0;
965 if ((c = ec_curveparse(&qd)) == 0) VALERR(qd.e);
966 rc = eccurve_pywrap(0, c);
967 end:
968 return (rc);
969 }
970
971 static PyObject *eccurve_dopywrap(PyTypeObject *ty,
972 PyObject *fobj, ec_curve *c)
973 {
974 eccurve_pyobj *cobj = newtype(ty, 0, c->ops->name);
975 cobj->c = c;
976 cobj->fobj = fobj;
977 cobj->ty.ht_type.tp_basicsize = sizeof(ecpt_pyobj);
978 cobj->ty.ht_type.tp_base = ecptcurve_pytype;
979 Py_INCREF(ecptcurve_pytype);
980 cobj->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
981 Py_TPFLAGS_BASETYPE |
982 Py_TPFLAGS_CHECKTYPES |
983 Py_TPFLAGS_HEAPTYPE);
984 cobj->ty.ht_type.tp_alloc = PyType_GenericAlloc;
985 cobj->ty.ht_type.tp_free = 0;
986 cobj->ty.ht_type.tp_new = ecpt_pynew;
987 typeready(&cobj->ty.ht_type);
988 return ((PyObject *)cobj);
989 }
990
991 PyObject *eccurve_pywrap(PyObject *fobj, ec_curve *c)
992 {
993 PyTypeObject *ty;
994
995 if (!fobj)
996 fobj = field_pywrap(c->f);
997 else
998 Py_INCREF(fobj);
999 assert(FIELD_F(fobj) == c->f);
1000 if (STRCMP(EC_NAME(c), ==, "prime"))
1001 ty = ecprimecurve_pytype;
1002 else if (STRCMP(EC_NAME(c), ==, "primeproj"))
1003 ty = ecprimeprojcurve_pytype;
1004 else if (STRCMP(EC_NAME(c), ==, "bin"))
1005 ty = ecbincurve_pytype;
1006 else if (STRCMP(EC_NAME(c), ==, "binproj"))
1007 ty = ecbinprojcurve_pytype;
1008 else
1009 abort();
1010 return (eccurve_dopywrap(ty, fobj, c));
1011 }
1012
1013 static PyObject *eccurve_pynew(PyTypeObject *ty,
1014 ec_curve *(*make)(field *, mp *, mp *),
1015 PyObject *arg, PyObject *kw)
1016 {
1017 PyObject *fobj;
1018 PyObject *cobj = 0;
1019 static const char *const kwlist[] = { "field", "a", "b", 0 };
1020 mp *aa = 0, *bb = 0;
1021
1022 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O&O&", KWLIST,
1023 field_pytype, &fobj,
1024 convmp, &aa, convmp, &bb))
1025 goto end;
1026 Py_INCREF(fobj);
1027 cobj = eccurve_dopywrap(ty, fobj, make(FIELD_F(fobj), aa, bb));
1028 end:
1029 if (aa) MP_DROP(aa);
1030 if (bb) MP_DROP(bb);
1031 return (cobj);
1032 }
1033
1034 static PyObject *ecget_name(PyObject *me, void *hunoz)
1035 { return (PyString_FromString(EC_NAME(ECCURVE_C(me)))); }
1036
1037 static PyObject *ecget_a(PyObject *me, void *hunoz)
1038 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->a))); }
1039
1040 static PyObject *ecget_b(PyObject *me, void *hunoz)
1041 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->b))); }
1042
1043 static PyObject *ecget_field(PyObject *me, void *hunoz)
1044 { RETURN_OBJ(ECCURVE_FOBJ(me)); }
1045
1046 static PyObject *ecget_inf(PyObject *me, void *hunoz)
1047 { ec inf = EC_INIT; return (ecpt_pywrap(me, &inf)); }
1048
1049 static const PyGetSetDef eccurve_pygetset[] = {
1050 #define GETSETNAME(op, name) ec##op##_##name
1051 GET (name, "E.name -> name of this kind of curve")
1052 GET (a, "E.a -> first parameter of curve")
1053 GET (b, "E.b -> second parameter of curve")
1054 GET (field, "E.field -> finite field containing this curve")
1055 GET (inf, "E.inf -> point at infinity of this curve")
1056 #undef GETSETNAME
1057 { 0 }
1058 };
1059
1060 static const PyMethodDef eccurve_pymethods[] = {
1061 #define METHNAME(name) ecmeth_##name
1062 METH (mmul, "E.mmul([(P0, N0), (P1, N1), ...]) = N0 P0 + N1 P1 + ...")
1063 METH (find, "E.find(X) -> P")
1064 KWMETH(rand, "E.rand([rng = rand]) -> P")
1065 #undef METHNAME
1066 { 0 }
1067 };
1068
1069 static PyTypeObject eccurve_pytype_skel = {
1070 PyObject_HEAD_INIT(0) 0, /* Header */
1071 "ECCurve", /* @tp_name@ */
1072 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1073 0, /* @tp_itemsize@ */
1074
1075 eccurve_pydealloc, /* @tp_dealloc@ */
1076 0, /* @tp_print@ */
1077 0, /* @tp_getattr@ */
1078 0, /* @tp_setattr@ */
1079 0, /* @tp_compare@ */
1080 0, /* @tp_repr@ */
1081 0, /* @tp_as_number@ */
1082 0, /* @tp_as_sequence@ */
1083 0, /* @tp_as_mapping@ */
1084 0, /* @tp_hash@ */
1085 0, /* @tp_call@ */
1086 0, /* @tp_str@ */
1087 0, /* @tp_getattro@ */
1088 0, /* @tp_setattro@ */
1089 0, /* @tp_as_buffer@ */
1090 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1091 Py_TPFLAGS_BASETYPE,
1092
1093 /* @tp_doc@ */
1094 "An elliptic curve. Abstract class.",
1095
1096 0, /* @tp_traverse@ */
1097 0, /* @tp_clear@ */
1098 eccurve_pyrichcompare, /* @tp_richcompare@ */
1099 0, /* @tp_weaklistoffset@ */
1100 0, /* @tp_iter@ */
1101 0, /* @tp_iternext@ */
1102 PYMETHODS(eccurve), /* @tp_methods@ */
1103 0, /* @tp_members@ */
1104 PYGETSET(eccurve), /* @tp_getset@ */
1105 0, /* @tp_base@ */
1106 0, /* @tp_dict@ */
1107 0, /* @tp_descr_get@ */
1108 0, /* @tp_descr_set@ */
1109 0, /* @tp_dictoffset@ */
1110 0, /* @tp_init@ */
1111 PyType_GenericAlloc, /* @tp_alloc@ */
1112 abstract_pynew, /* @tp_new@ */
1113 0, /* @tp_free@ */
1114 0 /* @tp_is_gc@ */
1115 };
1116
1117 static PyObject *ecprimecurve_pynew(PyTypeObject *ty,
1118 PyObject *arg, PyObject *kw)
1119 {
1120 return (eccurve_pynew(ty, ec_prime, arg, kw));
1121 }
1122
1123 static PyTypeObject ecprimecurve_pytype_skel = {
1124 PyObject_HEAD_INIT(0) 0, /* Header */
1125 "ECPrimeCurve", /* @tp_name@ */
1126 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1127 0, /* @tp_itemsize@ */
1128
1129 eccurve_pydealloc, /* @tp_dealloc@ */
1130 0, /* @tp_print@ */
1131 0, /* @tp_getattr@ */
1132 0, /* @tp_setattr@ */
1133 0, /* @tp_compare@ */
1134 0, /* @tp_repr@ */
1135 0, /* @tp_as_number@ */
1136 0, /* @tp_as_sequence@ */
1137 0, /* @tp_as_mapping@ */
1138 0, /* @tp_hash@ */
1139 0, /* @tp_call@ */
1140 0, /* @tp_str@ */
1141 0, /* @tp_getattro@ */
1142 0, /* @tp_setattro@ */
1143 0, /* @tp_as_buffer@ */
1144 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1145 Py_TPFLAGS_BASETYPE,
1146
1147 /* @tp_doc@ */
1148 "ECPrimeCurve(FIELD, A, B): an elliptic curve over a prime field.\n"
1149 " Use ECPrimeProjCurve instead.",
1150
1151 0, /* @tp_traverse@ */
1152 0, /* @tp_clear@ */
1153 eccurve_pyrichcompare, /* @tp_richcompare@ */
1154 0, /* @tp_weaklistoffset@ */
1155 0, /* @tp_iter@ */
1156 0, /* @tp_iternext@ */
1157 0, /* @tp_methods@ */
1158 0, /* @tp_members@ */
1159 0, /* @tp_getset@ */
1160 0, /* @tp_base@ */
1161 0, /* @tp_dict@ */
1162 0, /* @tp_descr_get@ */
1163 0, /* @tp_descr_set@ */
1164 0, /* @tp_dictoffset@ */
1165 0, /* @tp_init@ */
1166 PyType_GenericAlloc, /* @tp_alloc@ */
1167 ecprimecurve_pynew, /* @tp_new@ */
1168 0, /* @tp_free@ */
1169 0 /* @tp_is_gc@ */
1170 };
1171
1172 static PyObject *ecprimeprojcurve_pynew(PyTypeObject *ty,
1173 PyObject *arg, PyObject *kw)
1174 {
1175 return (eccurve_pynew(ty, ec_primeproj, arg, kw));
1176 }
1177
1178 static PyTypeObject ecprimeprojcurve_pytype_skel = {
1179 PyObject_HEAD_INIT(0) 0, /* Header */
1180 "ECPrimeProjCurve", /* @tp_name@ */
1181 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1182 0, /* @tp_itemsize@ */
1183
1184 eccurve_pydealloc, /* @tp_dealloc@ */
1185 0, /* @tp_print@ */
1186 0, /* @tp_getattr@ */
1187 0, /* @tp_setattr@ */
1188 0, /* @tp_compare@ */
1189 0, /* @tp_repr@ */
1190 0, /* @tp_as_number@ */
1191 0, /* @tp_as_sequence@ */
1192 0, /* @tp_as_mapping@ */
1193 0, /* @tp_hash@ */
1194 0, /* @tp_call@ */
1195 0, /* @tp_str@ */
1196 0, /* @tp_getattro@ */
1197 0, /* @tp_setattro@ */
1198 0, /* @tp_as_buffer@ */
1199 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1200 Py_TPFLAGS_BASETYPE,
1201
1202 /* @tp_doc@ */
1203 "ECPrimeProjCurve(FIELD, A, B): an elliptic curve over a prime field\n"
1204 " using projective coordinates.",
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_iternext@ */
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 ecprimeprojcurve_pynew, /* @tp_new@ */
1223 0, /* @tp_free@ */
1224 0 /* @tp_is_gc@ */
1225 };
1226
1227 static PyObject *ecbincurve_pynew(PyTypeObject *ty,
1228 PyObject *arg, PyObject *kw)
1229 {
1230 return (eccurve_pynew(ty, ec_bin, arg, kw));
1231 }
1232
1233 static PyTypeObject ecbincurve_pytype_skel = {
1234 PyObject_HEAD_INIT(0) 0, /* Header */
1235 "ECBinCurve", /* @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 "ECBinCurve(FIELD, A, B): an elliptic curve over a binary field.\n"
1259 " Use ECBinProjCurve instead.",
1260
1261 0, /* @tp_traverse@ */
1262 0, /* @tp_clear@ */
1263 eccurve_pyrichcompare, /* @tp_richcompare@ */
1264 0, /* @tp_weaklistoffset@ */
1265 0, /* @tp_iter@ */
1266 0, /* @tp_iternext@ */
1267 0, /* @tp_methods@ */
1268 0, /* @tp_members@ */
1269 0, /* @tp_getset@ */
1270 0, /* @tp_base@ */
1271 0, /* @tp_dict@ */
1272 0, /* @tp_descr_get@ */
1273 0, /* @tp_descr_set@ */
1274 0, /* @tp_dictoffset@ */
1275 0, /* @tp_init@ */
1276 PyType_GenericAlloc, /* @tp_alloc@ */
1277 ecbincurve_pynew, /* @tp_new@ */
1278 0, /* @tp_free@ */
1279 0 /* @tp_is_gc@ */
1280 };
1281
1282 static PyObject *ecbinprojcurve_pynew(PyTypeObject *ty,
1283 PyObject *arg, PyObject *kw)
1284 {
1285 return (eccurve_pynew(ty, ec_binproj, arg, kw));
1286 }
1287
1288 static PyTypeObject ecbinprojcurve_pytype_skel = {
1289 PyObject_HEAD_INIT(0) 0, /* Header */
1290 "ECBinProjCurve", /* @tp_name@ */
1291 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1292 0, /* @tp_itemsize@ */
1293
1294 eccurve_pydealloc, /* @tp_dealloc@ */
1295 0, /* @tp_print@ */
1296 0, /* @tp_getattr@ */
1297 0, /* @tp_setattr@ */
1298 0, /* @tp_compare@ */
1299 0, /* @tp_repr@ */
1300 0, /* @tp_as_number@ */
1301 0, /* @tp_as_sequence@ */
1302 0, /* @tp_as_mapping@ */
1303 0, /* @tp_hash@ */
1304 0, /* @tp_call@ */
1305 0, /* @tp_str@ */
1306 0, /* @tp_getattro@ */
1307 0, /* @tp_setattro@ */
1308 0, /* @tp_as_buffer@ */
1309 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1310 Py_TPFLAGS_BASETYPE,
1311
1312 /* @tp_doc@ */
1313 "ECBinProjCurve(FIELD, A, B): an elliptic curve over a binary field,\n"
1314 " using projective coordinates.",
1315
1316 0, /* @tp_traverse@ */
1317 0, /* @tp_clear@ */
1318 eccurve_pyrichcompare, /* @tp_richcompare@ */
1319 0, /* @tp_weaklistoffset@ */
1320 0, /* @tp_iter@ */
1321 0, /* @tp_iternext@ */
1322 0, /* @tp_methods@ */
1323 0, /* @tp_members@ */
1324 0, /* @tp_getset@ */
1325 0, /* @tp_base@ */
1326 0, /* @tp_dict@ */
1327 0, /* @tp_descr_get@ */
1328 0, /* @tp_descr_set@ */
1329 0, /* @tp_dictoffset@ */
1330 0, /* @tp_init@ */
1331 PyType_GenericAlloc, /* @tp_alloc@ */
1332 ecbinprojcurve_pynew, /* @tp_new@ */
1333 0, /* @tp_free@ */
1334 0 /* @tp_is_gc@ */
1335 };
1336
1337 /*----- Curve info --------------------------------------------------------*/
1338
1339 static int ncurves = -1;
1340
1341 void ecinfo_copy(ec_info *eic, const ec_info *ei)
1342 {
1343 eic->c = eccurve_copy(ei->c);
1344 EC_CREATE(&eic->g);
1345 EC_COPY(&eic->g, &ei->g);
1346 eic->r = MP_COPY(ei->r);
1347 eic->h = MP_COPY(ei->h);
1348 }
1349
1350 PyObject *ecinfo_pywrap(ec_info *ei)
1351 {
1352 ecinfo_pyobj *o;
1353
1354 o = PyObject_NEW(ecinfo_pyobj, ecinfo_pytype);
1355 o->ei = *ei;
1356 o->cobj = eccurve_pywrap(0, o->ei.c);
1357 Py_INCREF(o->cobj);
1358 return ((PyObject *)o);
1359 }
1360
1361 static void ecinfo_pydealloc(PyObject *me)
1362 {
1363 ec_info *ei = ECINFO_EI(me);
1364 EC_DESTROY(&ei->g);
1365 MP_DROP(ei->r);
1366 MP_DROP(ei->h);
1367 Py_DECREF(ECINFO_COBJ(me));
1368 FREEOBJ(me);
1369 }
1370
1371 static PyObject *ecinfo_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
1372 {
1373 ec_info ei = { 0 };
1374 PyObject *e, *g;
1375 static const char *const kwlist[] = { "curve", "G", "r", "h", 0 };
1376 ecinfo_pyobj *rc = 0;
1377
1378 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O!O&O&:new", KWLIST,
1379 eccurve_pytype, &e, ecpt_pytype, &g,
1380 convmp, &ei.r, convmp, &ei.h))
1381 goto end;
1382 if (ECPT_C(g) != ECCURVE_C(e) && !ec_samep(ECPT_C(g), ECCURVE_C(e)))
1383 TYERR("point not from this curve");
1384 ei.c = ECCURVE_C(e);
1385 EC_CREATE(&ei.g);
1386 EC_OUT(ei.c, &ei.g, ECPT_P(g));
1387 rc = (ecinfo_pyobj *)ty->tp_alloc(ty, 0);
1388 rc->ei = ei;
1389 rc->cobj = e;
1390 Py_INCREF(rc->cobj);
1391 return ((PyObject *)rc);
1392
1393 end:
1394 mp_drop(ei.r);
1395 mp_drop(ei.h);
1396 return (0);
1397 }
1398
1399 static PyObject *meth__ECInfo_parse(PyObject *me, PyObject *arg)
1400 {
1401 char *p;
1402 qd_parse qd;
1403 ec_info ei;
1404 PyObject *rc = 0;
1405
1406 if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p)) goto end;
1407 qd.p = p; qd.e = 0;
1408 if (ec_infoparse(&qd, &ei)) VALERR(qd.e);
1409 rc = Py_BuildValue("(Ns)", ecinfo_pywrap(&ei), qd.p);
1410 end:
1411 return (rc);
1412 }
1413
1414 static PyObject *meth__ECInfo__curven(PyObject *me, PyObject *arg)
1415 {
1416 int i;
1417 ec_info ei;
1418 PyObject *rc = 0;
1419
1420 if (!PyArg_ParseTuple(arg, "Oi:_curven", &me, &i)) goto end;
1421 if (i < 0 || i >= ncurves) VALERR("curve index out of range");
1422 ec_infofromdata(&ei, ectab[i].data);
1423 rc = ecinfo_pywrap(&ei);
1424 end:
1425 return (rc);
1426 }
1427
1428 static PyObject *ecinfo_pyrichcompare(PyObject *x, PyObject *y, int op)
1429 {
1430 int b = ec_sameinfop(ECINFO_EI(x), ECINFO_EI(y));
1431 switch (op) {
1432 case Py_EQ: break;
1433 case Py_NE: b = !b;
1434 default: TYERR("can't order elliptic curve infos");
1435 }
1436 return (getbool(b));
1437 end:
1438 return (0);
1439 }
1440
1441 static PyObject *eimeth_check(PyObject *me, PyObject *arg, PyObject *kw)
1442 {
1443 static const char *const kwlist[] = { "rng", 0 };
1444 grand *r = &rand_global;
1445 const char *p;
1446
1447 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:check", KWLIST,
1448 convgrand, &r))
1449 goto end;
1450 if ((p = ec_checkinfo(ECINFO_EI(me), r)) != 0)
1451 VALERR(p);
1452 RETURN_ME;
1453 end:
1454 return (0);
1455 }
1456
1457 static PyObject *eiget_curve(PyObject *me, void *hunoz)
1458 { RETURN_OBJ(ECINFO_COBJ(me)); }
1459
1460 static PyObject *eiget_G(PyObject *me, void *hunoz)
1461 {
1462 ec_info *ei = ECINFO_EI(me);
1463 ec p = EC_INIT;
1464 EC_IN(ei->c, &p, &ei->g);
1465 return (ecpt_pywrap(ECINFO_COBJ(me), &p));
1466 }
1467
1468 static PyObject *eiget_r(PyObject *me, void *hunoz)
1469 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->r))); }
1470
1471 static PyObject *eiget_h(PyObject *me, void *hunoz)
1472 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->h))); }
1473
1474 static const PyGetSetDef ecinfo_pygetset[] = {
1475 #define GETSETNAME(op, name) ei##op##_##name
1476 GET (curve, "I.curve -> the elliptic curve")
1477 GET (G, "I.G -> generator point for the group")
1478 GET (r, "I.r -> order of the group (and hence of G")
1479 GET (h, "I.h -> cofactor of the group")
1480 #undef GETSETNAME
1481 { 0 }
1482 };
1483
1484 static const PyMethodDef ecinfo_pymethods[] = {
1485 #define METHNAME(name) eimeth_##name
1486 KWMETH(check, "I.check([rng = rand]) -> None")
1487 #undef METHNAME
1488 { 0 }
1489 };
1490
1491 static PyTypeObject ecinfo_pytype_skel = {
1492 PyObject_HEAD_INIT(0) 0, /* Header */
1493 "ECInfo", /* @tp_name@ */
1494 sizeof(ecinfo_pyobj), /* @tp_basicsize@ */
1495 0, /* @tp_itemsize@ */
1496
1497 ecinfo_pydealloc, /* @tp_dealloc@ */
1498 0, /* @tp_print@ */
1499 0, /* @tp_getattr@ */
1500 0, /* @tp_setattr@ */
1501 0, /* @tp_compare@ */
1502 0, /* @tp_repr@ */
1503 0, /* @tp_as_number@ */
1504 0, /* @tp_as_sequence@ */
1505 0, /* @tp_as_mapping@ */
1506 0, /* @tp_hash@ */
1507 0, /* @tp_call@ */
1508 0, /* @tp_str@ */
1509 0, /* @tp_getattro@ */
1510 0, /* @tp_setattro@ */
1511 0, /* @tp_as_buffer@ */
1512 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1513 Py_TPFLAGS_BASETYPE,
1514
1515 /* @tp_doc@ */
1516 "ECInfo(CURVE, G, R, H): elliptic curve domain parameters.",
1517
1518 0, /* @tp_traverse@ */
1519 0, /* @tp_clear@ */
1520 ecinfo_pyrichcompare, /* @tp_richcompare@ */
1521 0, /* @tp_weaklistoffset@ */
1522 0, /* @tp_iter@ */
1523 0, /* @tp_iternext@ */
1524 PYMETHODS(ecinfo), /* @tp_methods@ */
1525 0, /* @tp_members@ */
1526 PYGETSET(ecinfo), /* @tp_getset@ */
1527 0, /* @tp_base@ */
1528 0, /* @tp_dict@ */
1529 0, /* @tp_descr_get@ */
1530 0, /* @tp_descr_set@ */
1531 0, /* @tp_dictoffset@ */
1532 0, /* @tp_init@ */
1533 PyType_GenericAlloc, /* @tp_alloc@ */
1534 ecinfo_pynew, /* @tp_new@ */
1535 0, /* @tp_free@ */
1536 0 /* @tp_is_gc@ */
1537 };
1538
1539 /*----- Setup -------------------------------------------------------------*/
1540
1541 static const PyMethodDef methods[] = {
1542 #define METHNAME(func) meth_##func
1543 METH (_ECPt_frombuf, "frombuf(E, STR) -> (P, REST)")
1544 METH (_ECPtCurve_fromraw, "fromraw(E, STR) -> (P, REST)")
1545 KWMETH(_ECPtCurve_os2ecp, "os2ecp(E, STR, [flags = ...]) -> (P, REST)")
1546 METH (_ECPt_parse, "parse(E, STR) -> (P, REST)")
1547 METH (_ECCurve_parse, "parse(STR) -> (E, REST)")
1548 METH (_ECInfo_parse, "parse(STR) -> (I, REST)")
1549 METH (_ECInfo__curven, "_curven(N) -> I")
1550 #undef METHNAME
1551 { 0 }
1552 };
1553
1554 void ec_pyinit(void)
1555 {
1556 INITTYPE(ecpt, root);
1557 INITTYPE(ecptcurve, ecpt);
1558 INITTYPE(eccurve, type);
1559 INITTYPE(ecprimecurve, eccurve);
1560 INITTYPE(ecprimeprojcurve, ecprimecurve);
1561 INITTYPE(ecbincurve, eccurve);
1562 INITTYPE(ecbinprojcurve, ecbincurve);
1563 INITTYPE(ecinfo, root);
1564 addmethods(methods);
1565 }
1566
1567 static PyObject *namedcurves(void)
1568 {
1569 int i, j;
1570 const char *p;
1571 PyObject *d, *c;
1572
1573 d = PyDict_New();
1574 for (i = 0; ectab[i].name; i++) {
1575 p = ectab[i].name;
1576 for (j = 0; j < i; j++) {
1577 if (ectab[i].data == ectab[j].data) {
1578 c = PyDict_GetItemString(d, (/*unconst*/ char *)ectab[j].name);
1579 Py_INCREF(c);
1580 goto found;
1581 }
1582 }
1583 c = PyInt_FromLong(i);
1584 found:
1585 PyDict_SetItemString(d, (/*unconst*/ char *)p, c);
1586 Py_DECREF(c);
1587 }
1588 ncurves = i;
1589 return (d);
1590 }
1591
1592 void ec_pyinsert(PyObject *mod)
1593 {
1594 INSERT("ECPt", ecpt_pytype);
1595 INSERT("ECPtCurve", ecptcurve_pytype);
1596 INSERT("ECCurve", eccurve_pytype);
1597 INSERT("ECPrimeCurve", ecprimecurve_pytype);
1598 INSERT("ECPrimeProjCurve", ecprimeprojcurve_pytype);
1599 INSERT("ECBinCurve", ecbincurve_pytype);
1600 INSERT("ECBinProjCurve", ecbinprojcurve_pytype);
1601 INSERT("ECInfo", ecinfo_pytype);
1602 INSERT("_eccurves", namedcurves());
1603 }
1604
1605 /*----- That's all, folks -------------------------------------------------*/
Catacomb cryptographic library -- Python bindings