1 /* crypto/ec/ec_lib.c */
2 /* ====================================================================
3 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * openssl-core@openssl.org.
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
31 * 6. Redistributions of any form whatsoever must retain the following
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
50 * This product includes cryptographic software written by Eric Young
51 * (eay@cryptsoft.com). This product includes software written by Tim
52 * Hudson (tjh@cryptsoft.com).
58 #include <openssl/err.h>
63 /* functions for EC_GROUP objects */
65 EC_GROUP *EC_GROUP_new(const EC_METHOD *meth)
71 ECerr(EC_F_EC_GROUP_NEW, ERR_R_PASSED_NULL_PARAMETER);
74 if (meth->group_init == 0)
76 ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
80 ret = OPENSSL_malloc(sizeof *ret);
83 ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE);
89 ret->extra_data = NULL;
90 ret->extra_data_dup_func = 0;
91 ret->extra_data_free_func = 0;
92 ret->extra_data_clear_free_func = 0;
94 if (!meth->group_init(ret))
104 int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
106 if (group->meth->group_set_curve_GFp == 0)
108 ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
111 return group->meth->group_set_curve_GFp(group, p, a, b, ctx);
115 void EC_GROUP_free(EC_GROUP *group)
117 if (group->meth->group_finish != 0)
118 group->meth->group_finish(group);
120 EC_GROUP_free_extra_data(group);
126 void EC_GROUP_clear_free(EC_GROUP *group)
128 if (group->meth->group_clear_finish != 0)
129 group->meth->group_clear_finish(group);
130 else if (group->meth != NULL && group->meth->group_finish != 0)
131 group->meth->group_finish(group);
133 EC_GROUP_clear_free_extra_data(group);
135 memset(group, 0, sizeof *group);
140 int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src)
142 if (dest->meth->group_copy == 0)
144 ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
147 if (dest->meth != src->meth)
149 ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS);
153 EC_GROUP_clear_free_extra_data(dest);
154 if (src->extra_data_dup_func)
156 if (src->extra_data != NULL)
158 dest->extra_data = src->extra_data_dup_func(src->extra_data);
159 if (dest->extra_data == NULL)
163 dest->extra_data_dup_func = src->extra_data_dup_func;
164 dest->extra_data_free_func = src->extra_data_free_func;
165 dest->extra_data_clear_free_func = src->extra_data_clear_free_func;
168 return dest->meth->group_copy(dest, src);
172 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, const BIGNUM *order, const BIGNUM *cofactor)
174 if (group->meth->group_set_generator == 0)
176 ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
179 return group->meth->group_set_generator(group, generator, order, cofactor);
183 /* TODO: 'set' and 'get' functions for EC_GROUPs */
186 /* this has 'package' visibility */
187 int EC_GROUP_set_extra_data(EC_GROUP *group, void *extra_data, void *(*extra_data_dup_func)(void *),
188 void (*extra_data_free_func)(void *), void (*extra_data_clear_free_func)(void *))
190 if ((group->extra_data != NULL)
191 || (group->extra_data_dup_func != 0)
192 || (group->extra_data_free_func != 0)
193 || (group->extra_data_clear_free_func != 0))
195 ECerr(EC_F_EC_GROUP_SET_EXTRA_DATA, EC_R_SLOT_FULL);
199 group->extra_data = extra_data;
200 group->extra_data_dup_func = extra_data_dup_func;
201 group->extra_data_free_func = extra_data_free_func;
202 group->extra_data_clear_free_func = extra_data_clear_free_func;
207 /* this has 'package' visibility */
208 void *EC_GROUP_get_extra_data(EC_GROUP *group, void *(*extra_data_dup_func)(void *),
209 void (*extra_data_free_func)(void *), void (*extra_data_clear_free_func)(void *))
211 if ((group->extra_data_dup_func != extra_data_dup_func)
212 || (group->extra_data_free_func != extra_data_free_func)
213 || (group->extra_data_clear_free_func != extra_data_clear_free_func))
215 ECerr(EC_F_EC_GROUP_GET_EXTRA_DATA, EC_R_NO_SUCH_EXTRA_DATA);
219 return group->extra_data;
223 /* this has 'package' visibility */
224 void EC_GROUP_free_extra_data(EC_GROUP *group)
226 if (group->extra_data_free_func)
227 group->extra_data_free_func(group->extra_data);
228 group->extra_data = NULL;
229 group->extra_data_dup_func = 0;
230 group->extra_data_free_func = 0;
231 group->extra_data_clear_free_func = 0;
235 /* this has 'package' visibility */
236 void EC_GROUP_clear_free_extra_data(EC_GROUP *group)
238 if (group->extra_data_clear_free_func)
239 group->extra_data_clear_free_func(group->extra_data);
240 else if (group->extra_data_free_func)
241 group->extra_data_free_func(group->extra_data);
242 group->extra_data = NULL;
243 group->extra_data_dup_func = 0;
244 group->extra_data_free_func = 0;
245 group->extra_data_clear_free_func = 0;
250 /* functions for EC_POINT objects */
252 EC_POINT *EC_POINT_new(const EC_GROUP *group)
258 ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
261 if (group->meth->point_init == 0)
263 ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
267 ret = OPENSSL_malloc(sizeof *ret);
270 ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
274 ret->meth = group->meth;
276 if (!ret->meth->point_init(ret))
286 void EC_POINT_free(EC_POINT *point)
288 if (point->meth->point_finish != 0)
289 point->meth->point_finish(point);
294 void EC_POINT_clear_free(EC_POINT *point)
296 if (point->meth->point_clear_finish != 0)
297 point->meth->point_clear_finish(point);
298 else if (point->meth != NULL && point->meth->point_finish != 0)
299 point->meth->point_finish(point);
300 memset(point, 0, sizeof *point);
305 int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
307 if (dest->meth->point_copy == 0)
309 ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
312 if (dest->meth != src->meth)
314 ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
317 return dest->meth->point_copy(dest, src);
321 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
323 if (group->meth->point_set_to_infinity == 0)
325 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
328 if (group->meth != point->meth)
330 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
333 return group->meth->point_set_to_infinity(group, point);
337 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
338 const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
340 if (group->meth->point_set_affine_coordinates_GFp == 0)
342 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
345 if (group->meth != point->meth)
347 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
350 return group->meth->point_set_affine_coordinates_GFp(group, point, x, y, ctx);
354 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
355 BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
357 if (group->meth->point_get_affine_coordinates_GFp == 0)
359 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
362 if (group->meth != point->meth)
364 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
367 return group->meth->point_get_affine_coordinates_GFp(group, point, x, y, ctx);
371 /* TODO: other 'set' and 'get' functions for EC_POINTs */
374 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, point_conversion_form_t form,
375 unsigned char *buf, size_t len, BN_CTX *ctx)
377 if (group->meth->point2oct == 0)
379 ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
382 if (group->meth != point->meth)
384 ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
387 return group->meth->point2oct(group, point, form, buf, len, ctx);
391 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
392 const unsigned char *buf, size_t len, BN_CTX *ctx)
394 if (group->meth->oct2point == 0)
396 ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
399 if (group->meth != point->meth)
401 ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
404 return group->meth->oct2point(group, point, buf, len, ctx);
408 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
410 if (group->meth->add == 0)
412 ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
415 if ((group->meth != r->meth) || (r->meth != a->meth) || (a->meth != b->meth))
417 ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
420 return group->meth->add(group, r, a, b, ctx);
424 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, BN_CTX *ctx)
426 if (group->meth->dbl == 0)
428 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
431 if ((group->meth != r->meth) || (r->meth != a->meth))
433 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
436 return group->meth->dbl(group, r, a, ctx);
440 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
442 if (group->meth->is_at_infinity == 0)
444 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
447 if (group->meth != point->meth)
449 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
452 return group->meth->is_at_infinity(group, point);
456 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, BN_CTX *ctx)
458 if (group->meth->is_on_curve == 0)
460 ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
463 if (group->meth != point->meth)
465 ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
468 return group->meth->is_on_curve(group, point, ctx);
472 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
474 if (group->meth->make_affine == 0)
476 ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
479 if (group->meth != point->meth)
481 ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
484 return group->meth->make_affine(group, point, ctx);