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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 
ASN1_item_verify(const ASN1_ITEM * it,X509_ALGOR * a,ASN1_BIT_STRING * signature,void * asn,EVP_PKEY * pkey)74 int 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, ASN1_item_verify, 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, ASN1_item_verify, 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, ASN1_item_verify, 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, ASN1_item_verify, 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, ASN1_item_verify, 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;
129 err:
130 	EVP_MD_CTX_cleanup(&ctx);
131 	return ret;
132 	}
133 
134