1 /* crypto/ecdsa/ecdsa_sign.c */
2 /* ====================================================================
3 * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
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
15 * distribution.
16 *
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/)"
21 *
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.
26 *
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.
30 *
31 * 6. Redistributions of any form whatsoever must retain the following
32 * acknowledgment:
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
35 *
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 * ====================================================================
49 *
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).
53 *
54 */
55
56 #include "ecs_locl.h"
57 #ifndef OPENSSL_NO_ENGINE
58 #include <openssl/engine.h>
59 #endif
60 #include <openssl/rand.h>
61 #include <openssl/err.h>
62
ECDSA_do_sign(const unsigned char * dgst,int dlen,EC_KEY * eckey)63 ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst, int dlen, EC_KEY *eckey)
64 {
65 return ECDSA_do_sign_ex(dgst, dlen, NULL, NULL, eckey);
66 }
67
ECDSA_do_sign_ex(const unsigned char * dgst,int dlen,const BIGNUM * kinv,const BIGNUM * rp,EC_KEY * eckey)68 ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst, int dlen,
69 const BIGNUM *kinv, const BIGNUM *rp, EC_KEY *eckey)
70 {
71 ECDSA_DATA *ecdsa = ecdsa_check(eckey);
72 if (ecdsa == NULL)
73 return NULL;
74 return ecdsa->meth->ecdsa_do_sign(dgst, dlen, kinv, rp, eckey);
75 }
76
ECDSA_sign(int type,const unsigned char * dgst,int dlen,unsigned char * sig,unsigned int * siglen,EC_KEY * eckey)77 int ECDSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char
78 *sig, unsigned int *siglen, EC_KEY *eckey)
79 {
80 return ECDSA_sign_ex(type, dgst, dlen, sig, siglen, NULL, NULL, eckey);
81 }
82
ECDSA_sign_ex(int type,const unsigned char * dgst,int dlen,unsigned char * sig,unsigned int * siglen,const BIGNUM * kinv,const BIGNUM * r,EC_KEY * eckey)83 int ECDSA_sign_ex(int type, const unsigned char *dgst, int dlen, unsigned char
84 *sig, unsigned int *siglen, const BIGNUM *kinv, const BIGNUM *r,
85 EC_KEY *eckey)
86 {
87 ECDSA_SIG *s;
88 RAND_seed(dgst, dlen);
89 s = ECDSA_do_sign_ex(dgst, dlen, kinv, r, eckey);
90 if (s == NULL)
91 {
92 *siglen=0;
93 return 0;
94 }
95 *siglen = i2d_ECDSA_SIG(s, &sig);
96 ECDSA_SIG_free(s);
97 return 1;
98 }
99
ECDSA_sign_setup(EC_KEY * eckey,BN_CTX * ctx_in,BIGNUM ** kinvp,BIGNUM ** rp)100 int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
101 BIGNUM **rp)
102 {
103 ECDSA_DATA *ecdsa = ecdsa_check(eckey);
104 if (ecdsa == NULL)
105 return 0;
106 if (EC_KEY_get_nonce_from_hash(eckey))
107 {
108 /* You cannot precompute the ECDSA nonce if it is required to
109 * depend on the message. */
110 ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ECDSA_R_NONCE_CANNOT_BE_PRECOMPUTED);
111 return 0;
112 }
113 return ecdsa->meth->ecdsa_sign_setup(eckey, ctx_in, kinvp, rp, NULL, 0);
114 }
115