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