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
63ECDSA_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
68ECDSA_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
77int 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
83int 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
100int 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