1 /* crypto/asn1/a_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 <time.h>
61
62 #include "cryptlib.h"
63
64 #ifndef NO_SYS_TYPES_H
65 # include <sys/types.h>
66 #endif
67
68 #include <openssl/bn.h>
69 #include <openssl/x509.h>
70 #include <openssl/objects.h>
71 #include <openssl/buffer.h>
72 #include <openssl/evp.h>
73
74 #ifndef NO_ASN1_OLD
75
ASN1_verify(i2d_of_void * i2d,X509_ALGOR * a,ASN1_BIT_STRING * signature,char * data,EVP_PKEY * pkey)76 int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature,
77 char *data, EVP_PKEY *pkey)
78 {
79 EVP_MD_CTX ctx;
80 const EVP_MD *type;
81 unsigned char *p,*buf_in=NULL;
82 int ret= -1,i,inl;
83
84 EVP_MD_CTX_init(&ctx);
85 i=OBJ_obj2nid(a->algorithm);
86 type=EVP_get_digestbyname(OBJ_nid2sn(i));
87 if (type == NULL)
88 {
89 ASN1err(ASN1_F_ASN1_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
90 goto err;
91 }
92
93 inl=i2d(data,NULL);
94 buf_in=OPENSSL_malloc((unsigned int)inl);
95 if (buf_in == NULL)
96 {
97 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_MALLOC_FAILURE);
98 goto err;
99 }
100 p=buf_in;
101
102 i2d(data,&p);
103 EVP_VerifyInit_ex(&ctx,type, NULL);
104 EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl);
105
106 OPENSSL_cleanse(buf_in,(unsigned int)inl);
107 OPENSSL_free(buf_in);
108
109 if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data,
110 (unsigned int)signature->length,pkey) <= 0)
111 {
112 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB);
113 ret=0;
114 goto err;
115 }
116 /* we don't need to zero the 'ctx' because we just checked
117 * public information */
118 /* memset(&ctx,0,sizeof(ctx)); */
119 ret=1;
120 err:
121 EVP_MD_CTX_cleanup(&ctx);
122 return(ret);
123 }
124
125 #endif
126
127
ASN1_item_verify(const ASN1_ITEM * it,X509_ALGOR * a,ASN1_BIT_STRING * signature,void * asn,EVP_PKEY * pkey)128 int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, ASN1_BIT_STRING *signature,
129 void *asn, EVP_PKEY *pkey)
130 {
131 EVP_MD_CTX ctx;
132 const EVP_MD *type;
133 unsigned char *buf_in=NULL;
134 int ret= -1,i,inl;
135
136 EVP_MD_CTX_init(&ctx);
137 i=OBJ_obj2nid(a->algorithm);
138 type=EVP_get_digestbyname(OBJ_nid2sn(i));
139 if (type == NULL)
140 {
141 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
142 goto err;
143 }
144
145 if (!EVP_VerifyInit_ex(&ctx,type, NULL))
146 {
147 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
148 ret=0;
149 goto err;
150 }
151
152 inl = ASN1_item_i2d(asn, &buf_in, it);
153
154 if (buf_in == NULL)
155 {
156 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_MALLOC_FAILURE);
157 goto err;
158 }
159
160 EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl);
161
162 OPENSSL_cleanse(buf_in,(unsigned int)inl);
163 OPENSSL_free(buf_in);
164
165 if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data,
166 (unsigned int)signature->length,pkey) <= 0)
167 {
168 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
169 ret=0;
170 goto err;
171 }
172 /* we don't need to zero the 'ctx' because we just checked
173 * public information */
174 /* memset(&ctx,0,sizeof(ctx)); */
175 ret=1;
176 err:
177 EVP_MD_CTX_cleanup(&ctx);
178 return(ret);
179 }
180
181
182