1 /* crypto/ec/ec_key.c */
3 * Written by Nils Larsch for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * openssl-core@openssl.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
58 /* ====================================================================
59 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
60 * Portions originally developed by SUN MICROSYSTEMS, INC., and
61 * contributed to the OpenSSL project.
64 #include <internal/cryptlib.h>
67 #include <openssl/err.h>
68 #ifndef OPENSSSL_NO_ENGINE
69 # include <openssl/engine.h>
72 EC_KEY *EC_KEY_new(void)
74 return EC_KEY_new_method(NULL);
77 EC_KEY *EC_KEY_new_by_curve_name(int nid)
79 EC_KEY *ret = EC_KEY_new();
82 ret->group = EC_GROUP_new_by_curve_name(nid);
83 if (ret->group == NULL) {
87 if (ret->meth->set_group && ret->meth->set_group(ret, ret->group) == 0) {
94 void EC_KEY_free(EC_KEY *r)
101 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_EC);
103 REF_PRINT("EC_KEY", r);
109 fprintf(stderr, "EC_KEY_free, bad reference count\n");
117 #ifndef OPENSSL_NO_ENGINE
119 ENGINE_finish(r->engine);
122 EC_GROUP_free(r->group);
123 EC_POINT_free(r->pub_key);
124 BN_clear_free(r->priv_key);
126 EC_EX_DATA_free_all_data(&r->method_data);
128 OPENSSL_clear_free((void *)r, sizeof(EC_KEY));
131 EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src)
135 if (dest == NULL || src == NULL) {
136 ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER);
139 if (src->meth != dest->meth) {
140 if (dest->meth->finish)
141 dest->meth->finish(dest);
142 #ifndef OPENSSL_NO_ENGINE
143 if (dest->engine && ENGINE_finish(dest->engine) == 0)
148 /* copy the parameters */
150 const EC_METHOD *meth = EC_GROUP_method_of(src->group);
151 /* clear the old group */
152 EC_GROUP_free(dest->group);
153 dest->group = EC_GROUP_new(meth);
154 if (dest->group == NULL)
156 if (!EC_GROUP_copy(dest->group, src->group))
159 /* copy the public key */
160 if (src->pub_key && src->group) {
161 EC_POINT_free(dest->pub_key);
162 dest->pub_key = EC_POINT_new(src->group);
163 if (dest->pub_key == NULL)
165 if (!EC_POINT_copy(dest->pub_key, src->pub_key))
168 /* copy the private key */
170 if (dest->priv_key == NULL) {
171 dest->priv_key = BN_new();
172 if (dest->priv_key == NULL)
175 if (!BN_copy(dest->priv_key, src->priv_key))
178 /* copy method/extra data */
179 EC_EX_DATA_free_all_data(&dest->method_data);
181 for (d = src->method_data; d != NULL; d = d->next) {
182 void *t = d->dup_func(d->data);
186 if (!EC_EX_DATA_set_data
187 (&dest->method_data, t, d->dup_func, d->free_func,
193 dest->enc_flag = src->enc_flag;
194 dest->conv_form = src->conv_form;
195 dest->version = src->version;
196 dest->flags = src->flags;
198 if (src->meth != dest->meth) {
199 #ifndef OPENSSL_NO_ENGINE
200 if (src->engine && ENGINE_init(src->engine) == 0)
202 dest->engine = src->engine;
204 dest->meth = src->meth;
207 if (src->meth->copy && src->meth->copy(dest, src) == 0)
213 EC_KEY *EC_KEY_dup(const EC_KEY *ec_key)
215 EC_KEY *ret = EC_KEY_new_method(ec_key->engine);
218 if (EC_KEY_copy(ret, ec_key) == NULL) {
225 int EC_KEY_up_ref(EC_KEY *r)
227 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_EC);
229 REF_PRINT("EC_KEY", r);
233 fprintf(stderr, "EC_KEY_up, bad reference count\n");
237 return ((i > 1) ? 1 : 0);
240 int EC_KEY_generate_key(EC_KEY *eckey)
242 if (!eckey || !eckey->group) {
243 ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
246 if (eckey->meth->keygen)
247 return eckey->meth->keygen(eckey);
248 ECerr(EC_F_EC_KEY_GENERATE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
252 int ossl_ec_key_gen(EC_KEY *eckey)
256 BIGNUM *priv_key = NULL, *order = NULL;
257 EC_POINT *pub_key = NULL;
259 if ((order = BN_new()) == NULL)
261 if ((ctx = BN_CTX_new()) == NULL)
264 if (eckey->priv_key == NULL) {
266 if (priv_key == NULL)
269 priv_key = eckey->priv_key;
271 if (!EC_GROUP_get_order(eckey->group, order, ctx))
275 if (!BN_rand_range(priv_key, order))
277 while (BN_is_zero(priv_key)) ;
279 if (eckey->pub_key == NULL) {
280 pub_key = EC_POINT_new(eckey->group);
284 pub_key = eckey->pub_key;
286 if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx))
289 eckey->priv_key = priv_key;
290 eckey->pub_key = pub_key;
296 if (eckey->pub_key == NULL)
297 EC_POINT_free(pub_key);
298 if (eckey->priv_key != priv_key)
304 int EC_KEY_check_key(const EC_KEY *eckey)
308 const BIGNUM *order = NULL;
309 EC_POINT *point = NULL;
311 if (!eckey || !eckey->group || !eckey->pub_key) {
312 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
316 if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key)) {
317 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_AT_INFINITY);
321 if ((ctx = BN_CTX_new()) == NULL)
323 if ((point = EC_POINT_new(eckey->group)) == NULL)
326 /* testing whether the pub_key is on the elliptic curve */
327 if (EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx) <= 0) {
328 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE);
331 /* testing whether pub_key * order is the point at infinity */
332 order = eckey->group->order;
333 if (BN_is_zero(order)) {
334 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_GROUP_ORDER);
337 if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) {
338 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
341 if (!EC_POINT_is_at_infinity(eckey->group, point)) {
342 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
346 * in case the priv_key is present : check if generator * priv_key ==
349 if (eckey->priv_key) {
350 if (BN_cmp(eckey->priv_key, order) >= 0) {
351 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
354 if (!EC_POINT_mul(eckey->group, point, eckey->priv_key,
356 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
359 if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, ctx) != 0) {
360 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY);
367 EC_POINT_free(point);
371 int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x,
376 EC_POINT *point = NULL;
378 #ifndef OPENSSL_NO_EC2M
379 int tmp_nid, is_char_two = 0;
382 if (!key || !key->group || !x || !y) {
383 ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
384 ERR_R_PASSED_NULL_PARAMETER);
391 point = EC_POINT_new(key->group);
396 tx = BN_CTX_get(ctx);
397 ty = BN_CTX_get(ctx);
399 #ifndef OPENSSL_NO_EC2M
400 tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(key->group));
402 if (tmp_nid == NID_X9_62_characteristic_two_field)
406 if (!EC_POINT_set_affine_coordinates_GF2m(key->group, point,
409 if (!EC_POINT_get_affine_coordinates_GF2m(key->group, point,
415 if (!EC_POINT_set_affine_coordinates_GFp(key->group, point,
418 if (!EC_POINT_get_affine_coordinates_GFp(key->group, point,
423 * Check if retrieved coordinates match originals and are less than field
424 * order: if not values are out of range.
426 if (BN_cmp(x, tx) || BN_cmp(y, ty)
427 || (BN_cmp(x, key->group->field) >= 0)
428 || (BN_cmp(y, key->group->field) >= 0)) {
429 ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
430 EC_R_COORDINATES_OUT_OF_RANGE);
434 if (!EC_KEY_set_public_key(key, point))
437 if (EC_KEY_check_key(key) == 0)
444 EC_POINT_free(point);
449 const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key)
454 int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group)
456 if (key->meth->set_group && key->meth->set_group(key, group) == 0)
458 EC_GROUP_free(key->group);
459 key->group = EC_GROUP_dup(group);
460 return (key->group == NULL) ? 0 : 1;
463 const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key)
465 return key->priv_key;
468 int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key)
470 if (key->meth->set_private && key->meth->set_private(key, priv_key) == 0)
472 BN_clear_free(key->priv_key);
473 key->priv_key = BN_dup(priv_key);
474 return (key->priv_key == NULL) ? 0 : 1;
477 const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key)
482 int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key)
484 if (key->meth->set_public && key->meth->set_public(key, pub_key) == 0)
486 EC_POINT_free(key->pub_key);
487 key->pub_key = EC_POINT_dup(pub_key, key->group);
488 return (key->pub_key == NULL) ? 0 : 1;
491 unsigned int EC_KEY_get_enc_flags(const EC_KEY *key)
493 return key->enc_flag;
496 void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags)
498 key->enc_flag = flags;
501 point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key)
503 return key->conv_form;
506 void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform)
508 key->conv_form = cform;
509 if (key->group != NULL)
510 EC_GROUP_set_point_conversion_form(key->group, cform);
513 void *EC_KEY_get_key_method_data(EC_KEY *key,
514 void *(*dup_func) (void *),
515 void (*free_func) (void *),
516 void (*clear_free_func) (void *))
520 CRYPTO_r_lock(CRYPTO_LOCK_EC);
522 EC_EX_DATA_get_data(key->method_data, dup_func, free_func,
524 CRYPTO_r_unlock(CRYPTO_LOCK_EC);
529 void *EC_KEY_insert_key_method_data(EC_KEY *key, void *data,
530 void *(*dup_func) (void *),
531 void (*free_func) (void *),
532 void (*clear_free_func) (void *))
534 EC_EXTRA_DATA *ex_data;
536 CRYPTO_w_lock(CRYPTO_LOCK_EC);
538 EC_EX_DATA_get_data(key->method_data, dup_func, free_func,
541 EC_EX_DATA_set_data(&key->method_data, data, dup_func, free_func,
543 CRYPTO_w_unlock(CRYPTO_LOCK_EC);
548 void EC_KEY_set_asn1_flag(EC_KEY *key, int flag)
550 if (key->group != NULL)
551 EC_GROUP_set_asn1_flag(key->group, flag);
554 int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx)
556 if (key->group == NULL)
558 return EC_GROUP_precompute_mult(key->group, ctx);
561 int EC_KEY_get_flags(const EC_KEY *key)
566 void EC_KEY_set_flags(EC_KEY *key, int flags)
571 void EC_KEY_clear_flags(EC_KEY *key, int flags)
573 key->flags &= ~flags;