2 * Written by Nils Larsch for the OpenSSL project.
4 /* ====================================================================
5 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * openssl-core@openssl.org.
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
57 /* ====================================================================
58 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
59 * Portions originally developed by SUN MICROSYSTEMS, INC., and
60 * contributed to the OpenSSL project.
63 #include <internal/cryptlib.h>
66 #include <openssl/err.h>
67 #ifndef OPENSSL_NO_ENGINE
68 # include <openssl/engine.h>
71 EC_KEY *EC_KEY_new(void)
73 return EC_KEY_new_method(NULL);
76 EC_KEY *EC_KEY_new_by_curve_name(int nid)
78 EC_KEY *ret = EC_KEY_new();
81 ret->group = EC_GROUP_new_by_curve_name(nid);
82 if (ret->group == NULL) {
86 if (ret->meth->set_group != NULL
87 && ret->meth->set_group(ret, ret->group) == 0) {
94 void EC_KEY_free(EC_KEY *r)
101 CRYPTO_atomic_add(&r->references, -1, &i, r->lock);
102 REF_PRINT_COUNT("EC_KEY", r);
105 REF_ASSERT_ISNT(i < 0);
107 if (r->meth->finish != NULL)
110 #ifndef OPENSSL_NO_ENGINE
111 ENGINE_finish(r->engine);
114 if (r->group && r->group->meth->keyfinish)
115 r->group->meth->keyfinish(r);
117 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, r, &r->ex_data);
118 CRYPTO_THREAD_lock_free(r->lock);
119 EC_GROUP_free(r->group);
120 EC_POINT_free(r->pub_key);
121 BN_clear_free(r->priv_key);
123 OPENSSL_clear_free((void *)r, sizeof(EC_KEY));
126 EC_KEY *EC_KEY_copy(EC_KEY *dest, EC_KEY *src)
128 if (dest == NULL || src == NULL) {
129 ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER);
132 if (src->meth != dest->meth) {
133 if (dest->meth->finish != NULL)
134 dest->meth->finish(dest);
135 if (dest->group && dest->group->meth->keyfinish)
136 dest->group->meth->keyfinish(dest);
137 #ifndef OPENSSL_NO_ENGINE
138 if (ENGINE_finish(dest->engine) == 0)
143 /* copy the parameters */
144 if (src->group != NULL) {
145 const EC_METHOD *meth = EC_GROUP_method_of(src->group);
146 /* clear the old group */
147 EC_GROUP_free(dest->group);
148 dest->group = EC_GROUP_new(meth);
149 if (dest->group == NULL)
151 if (!EC_GROUP_copy(dest->group, src->group))
154 /* copy the public key */
155 if (src->pub_key != NULL && src->group != NULL) {
156 EC_POINT_free(dest->pub_key);
157 dest->pub_key = EC_POINT_new(src->group);
158 if (dest->pub_key == NULL)
160 if (!EC_POINT_copy(dest->pub_key, src->pub_key))
163 /* copy the private key */
164 if (src->priv_key != NULL) {
165 if (dest->priv_key == NULL) {
166 dest->priv_key = BN_new();
167 if (dest->priv_key == NULL)
170 if (!BN_copy(dest->priv_key, src->priv_key))
172 if (src->group->meth->keycopy
173 && src->group->meth->keycopy(dest, src) == 0)
179 dest->enc_flag = src->enc_flag;
180 dest->conv_form = src->conv_form;
181 dest->version = src->version;
182 dest->flags = src->flags;
183 if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_EC_KEY,
184 &dest->ex_data, &src->ex_data))
187 if (src->meth != dest->meth) {
188 #ifndef OPENSSL_NO_ENGINE
189 if (src->engine != NULL && ENGINE_init(src->engine) == 0)
191 dest->engine = src->engine;
193 dest->meth = src->meth;
196 if (src->meth->copy != NULL && src->meth->copy(dest, src) == 0)
202 EC_KEY *EC_KEY_dup(EC_KEY *ec_key)
204 EC_KEY *ret = EC_KEY_new_method(ec_key->engine);
209 if (EC_KEY_copy(ret, ec_key) == NULL) {
216 int EC_KEY_up_ref(EC_KEY *r)
220 if (CRYPTO_atomic_add(&r->references, 1, &i, r->lock) <= 0)
223 REF_PRINT_COUNT("EC_KEY", r);
224 REF_ASSERT_ISNT(i < 2);
225 return ((i > 1) ? 1 : 0);
228 int EC_KEY_generate_key(EC_KEY *eckey)
230 if (eckey == NULL || eckey->group == NULL) {
231 ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
234 if (eckey->meth->keygen != NULL)
235 return eckey->meth->keygen(eckey);
236 ECerr(EC_F_EC_KEY_GENERATE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
240 int ossl_ec_key_gen(EC_KEY *eckey)
242 OPENSSL_assert(eckey->group->meth->keygen != NULL);
243 return eckey->group->meth->keygen(eckey);
246 int ec_key_simple_generate_key(EC_KEY *eckey)
250 BIGNUM *priv_key = NULL;
251 const BIGNUM *order = NULL;
252 EC_POINT *pub_key = NULL;
254 if ((ctx = BN_CTX_new()) == NULL)
257 if (eckey->priv_key == NULL) {
259 if (priv_key == NULL)
262 priv_key = eckey->priv_key;
264 order = EC_GROUP_get0_order(eckey->group);
269 if (!BN_rand_range(priv_key, order))
271 while (BN_is_zero(priv_key)) ;
273 if (eckey->pub_key == NULL) {
274 pub_key = EC_POINT_new(eckey->group);
278 pub_key = eckey->pub_key;
280 if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx))
283 eckey->priv_key = priv_key;
284 eckey->pub_key = pub_key;
289 if (eckey->pub_key == NULL)
290 EC_POINT_free(pub_key);
291 if (eckey->priv_key != priv_key)
297 int ec_key_simple_generate_public_key(EC_KEY *eckey)
299 return EC_POINT_mul(eckey->group, eckey->pub_key, eckey->priv_key, NULL,
303 int EC_KEY_check_key(const EC_KEY *eckey)
305 if (eckey == NULL || eckey->group == NULL || eckey->pub_key == NULL) {
306 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
310 if (eckey->group->meth->keycheck == NULL) {
311 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
315 return eckey->group->meth->keycheck(eckey);
318 int ec_key_simple_check_key(const EC_KEY *eckey)
322 const BIGNUM *order = NULL;
323 EC_POINT *point = NULL;
325 if (eckey == NULL || eckey->group == NULL || eckey->pub_key == NULL) {
326 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
330 if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key)) {
331 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_POINT_AT_INFINITY);
335 if ((ctx = BN_CTX_new()) == NULL)
337 if ((point = EC_POINT_new(eckey->group)) == NULL)
340 /* testing whether the pub_key is on the elliptic curve */
341 if (EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx) <= 0) {
342 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE);
345 /* testing whether pub_key * order is the point at infinity */
346 order = eckey->group->order;
347 if (BN_is_zero(order)) {
348 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_INVALID_GROUP_ORDER);
351 if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) {
352 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_EC_LIB);
355 if (!EC_POINT_is_at_infinity(eckey->group, point)) {
356 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_WRONG_ORDER);
360 * in case the priv_key is present : check if generator * priv_key ==
363 if (eckey->priv_key != NULL) {
364 if (BN_cmp(eckey->priv_key, order) >= 0) {
365 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_WRONG_ORDER);
368 if (!EC_POINT_mul(eckey->group, point, eckey->priv_key,
370 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_EC_LIB);
373 if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, ctx) != 0) {
374 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY);
381 EC_POINT_free(point);
385 int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x,
390 EC_POINT *point = NULL;
392 #ifndef OPENSSL_NO_EC2M
393 int tmp_nid, is_char_two = 0;
396 if (key == NULL || key->group == NULL || x == NULL || y == NULL) {
397 ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
398 ERR_R_PASSED_NULL_PARAMETER);
405 point = EC_POINT_new(key->group);
410 tx = BN_CTX_get(ctx);
411 ty = BN_CTX_get(ctx);
415 #ifndef OPENSSL_NO_EC2M
416 tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(key->group));
418 if (tmp_nid == NID_X9_62_characteristic_two_field)
422 if (!EC_POINT_set_affine_coordinates_GF2m(key->group, point,
425 if (!EC_POINT_get_affine_coordinates_GF2m(key->group, point,
431 if (!EC_POINT_set_affine_coordinates_GFp(key->group, point,
434 if (!EC_POINT_get_affine_coordinates_GFp(key->group, point,
439 * Check if retrieved coordinates match originals and are less than field
440 * order: if not values are out of range.
442 if (BN_cmp(x, tx) || BN_cmp(y, ty)
443 || (BN_cmp(x, key->group->field) >= 0)
444 || (BN_cmp(y, key->group->field) >= 0)) {
445 ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
446 EC_R_COORDINATES_OUT_OF_RANGE);
450 if (!EC_KEY_set_public_key(key, point))
453 if (EC_KEY_check_key(key) == 0)
460 EC_POINT_free(point);
465 const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key)
470 int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group)
472 if (key->meth->set_group != NULL && key->meth->set_group(key, group) == 0)
474 EC_GROUP_free(key->group);
475 key->group = EC_GROUP_dup(group);
476 return (key->group == NULL) ? 0 : 1;
479 const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key)
481 return key->priv_key;
484 int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key)
486 if (key->group == NULL || key->group->meth == NULL)
488 if (key->group->meth->set_private
489 && key->meth->set_private(key, priv_key) == 0)
491 if (key->meth->set_private != NULL
492 && key->meth->set_private(key, priv_key) == 0)
494 BN_clear_free(key->priv_key);
495 key->priv_key = BN_dup(priv_key);
496 return (key->priv_key == NULL) ? 0 : 1;
499 const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key)
504 int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key)
506 if (key->meth->set_public != NULL
507 && key->meth->set_public(key, pub_key) == 0)
509 EC_POINT_free(key->pub_key);
510 key->pub_key = EC_POINT_dup(pub_key, key->group);
511 return (key->pub_key == NULL) ? 0 : 1;
514 unsigned int EC_KEY_get_enc_flags(const EC_KEY *key)
516 return key->enc_flag;
519 void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags)
521 key->enc_flag = flags;
524 point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key)
526 return key->conv_form;
529 void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform)
531 key->conv_form = cform;
532 if (key->group != NULL)
533 EC_GROUP_set_point_conversion_form(key->group, cform);
536 void EC_KEY_set_asn1_flag(EC_KEY *key, int flag)
538 if (key->group != NULL)
539 EC_GROUP_set_asn1_flag(key->group, flag);
542 int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx)
544 if (key->group == NULL)
546 return EC_GROUP_precompute_mult(key->group, ctx);
549 int EC_KEY_get_flags(const EC_KEY *key)
554 void EC_KEY_set_flags(EC_KEY *key, int flags)
559 void EC_KEY_clear_flags(EC_KEY *key, int flags)
561 key->flags &= ~flags;
564 size_t EC_KEY_key2buf(const EC_KEY *key, point_conversion_form_t form,
565 unsigned char **pbuf, BN_CTX *ctx)
567 if (key == NULL || key->pub_key == NULL || key->group == NULL)
569 return EC_POINT_point2buf(key->group, key->pub_key, form, pbuf, ctx);
572 int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf, size_t len,
575 if (key == NULL || key->group == NULL)
577 if (key->pub_key == NULL)
578 key->pub_key = EC_POINT_new(key->group);
579 if (key->pub_key == NULL)
581 if (EC_POINT_oct2point(key->group, key->pub_key, buf, len, ctx) == 0)
584 * Save the point conversion form.
585 * For non-custom curves the first octet of the buffer (excluding
586 * the last significant bit) contains the point conversion form.
587 * EC_POINT_oct2point() has already performed sanity checking of
588 * the buffer so we know it is valid.
590 if ((key->group->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0)
591 key->conv_form = (point_conversion_form_t)(buf[0] & ~0x01);
595 size_t EC_KEY_priv2oct(const EC_KEY *eckey, unsigned char *buf, size_t len)
597 if (eckey->group == NULL || eckey->group->meth == NULL)
599 if (eckey->group->meth->priv2oct == NULL) {
600 ECerr(EC_F_EC_KEY_PRIV2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
604 return eckey->group->meth->priv2oct(eckey, buf, len);
607 size_t ec_key_simple_priv2oct(const EC_KEY *eckey,
608 unsigned char *buf, size_t len)
612 buf_len = (EC_GROUP_get_degree(eckey->group) + 7) / 8;
613 if (eckey->priv_key == NULL)
617 else if (len < buf_len)
620 /* Octetstring may need leading zeros if BN is to short */
622 if (BN_bn2binpad(eckey->priv_key, buf, buf_len) == -1) {
623 ECerr(EC_F_EC_KEY_SIMPLE_PRIV2OCT, EC_R_BUFFER_TOO_SMALL);
630 int EC_KEY_oct2priv(EC_KEY *eckey, unsigned char *buf, size_t len)
632 if (eckey->group == NULL || eckey->group->meth == NULL)
634 if (eckey->group->meth->oct2priv == NULL) {
635 ECerr(EC_F_EC_KEY_OCT2PRIV, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
638 return eckey->group->meth->oct2priv(eckey, buf, len);
641 int ec_key_simple_oct2priv(EC_KEY *eckey, unsigned char *buf, size_t len)
643 if (eckey->priv_key == NULL)
644 eckey->priv_key = BN_secure_new();
645 if (eckey->priv_key == NULL) {
646 ECerr(EC_F_EC_KEY_SIMPLE_OCT2PRIV, ERR_R_MALLOC_FAILURE);
649 eckey->priv_key = BN_bin2bn(buf, len, eckey->priv_key);
650 if (eckey->priv_key == NULL) {
651 ECerr(EC_F_EC_KEY_SIMPLE_OCT2PRIV, ERR_R_BN_LIB);
657 size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf)
661 len = EC_KEY_priv2oct(eckey, NULL, 0);
664 buf = OPENSSL_malloc(len);
667 len = EC_KEY_priv2oct(eckey, buf, len);
676 int EC_KEY_can_sign(const EC_KEY *eckey)
678 if (eckey->group == NULL || eckey->group->meth == NULL
679 || (eckey->group->meth->flags & EC_FLAGS_NO_SIGN))