1/* crypto/evp/p_verify.c */
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#include "cryptlib.h"
61#include <openssl/evp.h>
62#include <openssl/objects.h>
63#include <openssl/x509.h>
64
65int EVP_VerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sigbuf,
66	     unsigned int siglen, EVP_PKEY *pkey)
67	{
68	unsigned char m[EVP_MAX_MD_SIZE];
69	unsigned int m_len;
70	int i = 0,ok = 0,v;
71	EVP_MD_CTX tmp_ctx;
72	EVP_PKEY_CTX *pkctx = NULL;
73
74	EVP_MD_CTX_init(&tmp_ctx);
75	if (!EVP_MD_CTX_copy_ex(&tmp_ctx,ctx))
76		goto err;
77	if (!EVP_DigestFinal_ex(&tmp_ctx,&(m[0]),&m_len))
78		goto err;
79	EVP_MD_CTX_cleanup(&tmp_ctx);
80
81	if (ctx->digest->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE)
82		{
83		i = -1;
84		pkctx = EVP_PKEY_CTX_new(pkey, NULL);
85		if (!pkctx)
86			goto err;
87		if (EVP_PKEY_verify_init(pkctx) <= 0)
88			goto err;
89		if (EVP_PKEY_CTX_set_signature_md(pkctx, ctx->digest) <= 0)
90			goto err;
91		i = EVP_PKEY_verify(pkctx, sigbuf, siglen, m, m_len);
92		err:
93		EVP_PKEY_CTX_free(pkctx);
94		return i;
95		}
96
97	for (i=0; i<4; i++)
98		{
99		v=ctx->digest->required_pkey_type[i];
100		if (v == 0) break;
101		if (pkey->type == v)
102			{
103			ok=1;
104			break;
105			}
106		}
107	if (!ok)
108		{
109		EVPerr(EVP_F_EVP_VERIFYFINAL,EVP_R_WRONG_PUBLIC_KEY_TYPE);
110		return(-1);
111		}
112        if (ctx->digest->verify == NULL)
113                {
114		EVPerr(EVP_F_EVP_VERIFYFINAL,EVP_R_NO_VERIFY_FUNCTION_CONFIGURED);
115		return(0);
116		}
117
118	return(ctx->digest->verify(ctx->digest->type,m,m_len,
119		sigbuf,siglen,pkey->pkey.ptr));
120	}
121
122