1 /* crypto/ec/ec_key.c */
3 * Written by Nils Larsch for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 1998-2002 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.
65 #include <openssl/err.h>
68 EC_KEY *EC_KEY_new(void)
72 ret=(EC_KEY *)OPENSSL_malloc(sizeof(EC_KEY));
75 ECerr(EC_F_EC_NEW, ERR_R_MALLOC_FAILURE);
84 ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
86 ret->meth_data = NULL;
91 void EC_KEY_free(EC_KEY *r)
95 if (r == NULL) return;
97 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_EC);
99 REF_PRINT("EC_KEY",r);
105 fprintf(stderr,"EC_KEY_free, bad reference count\n");
110 if (r->group != NULL)
111 EC_GROUP_free(r->group);
112 if (r->pub_key != NULL)
113 EC_POINT_free(r->pub_key);
114 if (r->priv_key != NULL)
115 BN_clear_free(r->priv_key);
117 if (r->meth_data && r->meth_data->finish)
118 r->meth_data->finish(r);
120 memset((void *)r, 0x0, sizeof(EC_KEY));
125 EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src)
127 if (dest == NULL || src == NULL)
129 ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER);
132 /* copy the parameters */
135 const EC_METHOD *meth = EC_GROUP_method_of(src->group);
136 /* clear the old group */
138 EC_GROUP_free(dest->group);
139 dest->group = EC_GROUP_new(meth);
140 if (dest->group == NULL)
142 if (!EC_GROUP_copy(dest->group, src->group))
145 /* copy the public key */
146 if (src->pub_key && src->group)
149 EC_POINT_free(dest->pub_key);
150 dest->pub_key = EC_POINT_new(src->group);
151 if (dest->pub_key == NULL)
153 if (!EC_POINT_copy(dest->pub_key, src->pub_key))
156 /* copy the private key */
159 if (dest->priv_key == NULL)
161 dest->priv_key = BN_new();
162 if (dest->priv_key == NULL)
165 if (!BN_copy(dest->priv_key, src->priv_key))
169 dest->enc_flag = src->enc_flag;
170 dest->conv_form = src->conv_form;
171 dest->version = src->version;
176 EC_KEY *EC_KEY_dup(const EC_KEY *eckey)
184 /* copy the parameters */
187 ret->group = EC_GROUP_dup(eckey->group);
188 if (ret->group == NULL)
191 /* copy the public key */
192 if (eckey->pub_key && eckey->group)
194 ret->pub_key = EC_POINT_dup(eckey->pub_key, eckey->group);
195 if (ret->pub_key == NULL)
198 /* copy the private key */
201 ret->priv_key = BN_dup(ret->priv_key);
202 if (ret->priv_key == NULL)
206 ret->enc_flag = eckey->enc_flag;
207 ret->conv_form = eckey->conv_form;
208 ret->version = eckey->version;
219 int EC_KEY_up_ref(EC_KEY *r)
221 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_EC);
223 REF_PRINT("EC_KEY",r);
228 fprintf(stderr, "EC_KEY_up, bad reference count\n");
232 return ((i > 1) ? 1 : 0);
235 int EC_KEY_generate_key(EC_KEY *eckey)
239 BIGNUM *priv_key = NULL, *order = NULL;
240 EC_POINT *pub_key = NULL;
242 if (!eckey || !eckey->group)
244 ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
248 if ((order = BN_new()) == NULL) goto err;
249 if ((ctx = BN_CTX_new()) == NULL) goto err;
251 if (eckey->priv_key == NULL)
254 if (priv_key == NULL)
258 priv_key = eckey->priv_key;
260 if (!EC_GROUP_get_order(eckey->group, order, ctx))
264 if (!BN_rand_range(priv_key, order))
266 while (BN_is_zero(priv_key));
268 if (eckey->pub_key == NULL)
270 pub_key = EC_POINT_new(eckey->group);
275 pub_key = eckey->pub_key;
277 if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx))
280 eckey->priv_key = priv_key;
281 eckey->pub_key = pub_key;
288 if (pub_key != NULL && eckey->pub_key == NULL)
289 EC_POINT_free(pub_key);
290 if (priv_key != NULL && eckey->priv_key == NULL)
297 int EC_KEY_check_key(const EC_KEY *eckey)
301 BIGNUM *order = NULL;
302 EC_POINT *point = NULL;
304 if (!eckey || !eckey->group || !eckey->pub_key)
306 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
310 if ((ctx = BN_CTX_new()) == NULL)
312 if ((order = BN_new()) == NULL)
314 if ((point = EC_POINT_new(eckey->group)) == NULL)
317 /* testing whether the pub_key is on the elliptic curve */
318 if (!EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx))
320 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE);
323 /* testing whether pub_key * order is the point at infinity */
324 if (!EC_GROUP_get_order(eckey->group, order, ctx))
326 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_GROUP_ORDER);
329 if (!EC_POINT_copy(point, eckey->pub_key))
331 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
334 if (!EC_POINT_mul(eckey->group, point, order, NULL, NULL, ctx))
336 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
339 if (!EC_POINT_is_at_infinity(eckey->group, point))
341 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
344 /* in case the priv_key is present :
345 * check if generator * priv_key == pub_key
349 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,
357 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
360 if (EC_POINT_cmp(eckey->group, point, eckey->pub_key,
363 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY);
374 EC_POINT_free(point);