1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to.  The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 *    notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 *    notice, this list of conditions and the following disclaimer in the
29 *    documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 *    must display the following acknowledgement:
32 *    "This product includes cryptographic software written by
33 *     Eric Young (eay@cryptsoft.com)"
34 *    The word 'cryptographic' can be left out if the rouines from the library
35 *    being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 *    the apps directory (application code) you must include an acknowledgement:
38 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed.  i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57#include <openssl/x509.h>
58
59#include <stdio.h>
60#include <time.h>
61#include <sys/types.h>
62
63#include <openssl/bn.h>
64#include <openssl/buf.h>
65#include <openssl/digest.h>
66#include <openssl/err.h>
67#include <openssl/evp.h>
68#include <openssl/mem.h>
69#include <openssl/obj.h>
70
71#include "../evp/internal.h"
72
73
74int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a,
75		ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey)
76	{
77	EVP_MD_CTX ctx;
78	uint8_t *buf_in = NULL;
79	int ret = 0, inl;
80
81	if (!pkey)
82		{
83		OPENSSL_PUT_ERROR(X509, ERR_R_PASSED_NULL_PARAMETER);
84		return 0;
85		}
86
87	if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7)
88		{
89		OPENSSL_PUT_ERROR(X509, X509_R_INVALID_BIT_STRING_BITS_LEFT);
90		return 0;
91		}
92
93	EVP_MD_CTX_init(&ctx);
94
95	if (!EVP_DigestVerifyInitFromAlgorithm(&ctx, a, pkey))
96		{
97		goto err;
98		}
99
100	inl = ASN1_item_i2d(asn, &buf_in, it);
101
102	if (buf_in == NULL)
103		{
104		OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
105		goto err;
106		}
107
108	if (!EVP_DigestVerifyUpdate(&ctx,buf_in,inl))
109		{
110		OPENSSL_cleanse(buf_in,(unsigned int)inl);
111		OPENSSL_free(buf_in);
112		OPENSSL_PUT_ERROR(X509, ERR_R_EVP_LIB);
113		goto err;
114		}
115
116	OPENSSL_cleanse(buf_in,(unsigned int)inl);
117	OPENSSL_free(buf_in);
118
119	if (EVP_DigestVerifyFinal(&ctx,signature->data,
120			(size_t)signature->length) <= 0)
121		{
122		OPENSSL_PUT_ERROR(X509, ERR_R_EVP_LIB);
123		goto err;
124		}
125	/* we don't need to zero the 'ctx' because we just checked
126	 * public information */
127	/* memset(&ctx,0,sizeof(ctx)); */
128	ret = 1;
129err:
130	EVP_MD_CTX_cleanup(&ctx);
131	return ret;
132	}
133
134