p_sign.c revision 1.21 
1/* $OpenBSD: p_sign.c,v 1.21 2024/03/26 06:08:51 joshua Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <stdio.h>
60
61#include <openssl/err.h>
62#include <openssl/evp.h>
63#include <openssl/objects.h>
64#include <openssl/x509.h>
65
66#include "evp_local.h"
67
68int
69EVP_SignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, unsigned int *siglen,
70    EVP_PKEY *pkey)
71{
72	unsigned char m[EVP_MAX_MD_SIZE];
73	unsigned int m_len;
74	EVP_MD_CTX *md_ctx;
75	EVP_PKEY_CTX *pkctx = NULL;
76	size_t sltmp;
77	int ret = 0;
78
79	*siglen = 0;
80
81	if ((md_ctx = EVP_MD_CTX_new()) == NULL)
82		goto err;
83	if (!EVP_MD_CTX_copy_ex(md_ctx, ctx))
84		goto err;
85	if (!EVP_DigestFinal_ex(md_ctx, &(m[0]), &m_len))
86		goto err;
87
88	sltmp = (size_t)EVP_PKEY_size(pkey);
89
90	if ((pkctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL)
91		goto err;
92	if (EVP_PKEY_sign_init(pkctx) <= 0)
93		goto err;
94	if (EVP_PKEY_CTX_set_signature_md(pkctx, ctx->digest) <= 0)
95		goto err;
96	if (EVP_PKEY_sign(pkctx, sigret, &sltmp, m, m_len) <= 0)
97		goto err;
98	*siglen = sltmp;
99
100	ret = 1;
101
102 err:
103	EVP_MD_CTX_free(md_ctx);
104	EVP_PKEY_CTX_free(pkctx);
105	return ret;
106}
107