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         ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
89         goto err;
90     }
91 
92     if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
93         ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
94         goto err;
95     }
96 
97     inl = i2d(data, NULL);
98     buf_in = OPENSSL_malloc((unsigned int)inl);
99     if (buf_in == NULL) {
100         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE);
101         goto err;
102     }
103     p = buf_in;
104 
105     i2d(data, &p);
106     if (!EVP_VerifyInit_ex(&ctx, type, NULL)) {
107         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB);
108         ret = 0;
109         goto err;
110     }
111     EVP_VerifyUpdate(&ctx, (unsigned char *)buf_in, inl);
112 
113     OPENSSL_cleanse(buf_in, (unsigned int)inl);
114     OPENSSL_free(buf_in);
115 
116     if (EVP_VerifyFinal(&ctx, (unsigned char *)signature->data,
117                         (unsigned int)signature->length, pkey) <= 0) {
118         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB);
119         ret = 0;
120         goto err;
121     }
122     /*
123      * we don't need to zero the 'ctx' because we just checked public
124      * information
125      */
126     /* memset(&ctx,0,sizeof(ctx)); */
127     ret = 1;
128  err:
129     EVP_MD_CTX_cleanup(&ctx);
130     return (ret);
131 }
132 
133 #endif
134 
ASN1_item_verify(const ASN1_ITEM * it,X509_ALGOR * a,ASN1_BIT_STRING * signature,void * asn,EVP_PKEY * pkey)135 int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a,
136                      ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey)
137 {
138     EVP_MD_CTX ctx;
139     const EVP_MD *type;
140     unsigned char *buf_in = NULL;
141     int ret = -1, i, inl;
142 
143     if (!pkey) {
144         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER);
145         return -1;
146     }
147 
148     if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
149         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
150         return -1;
151     }
152 
153     EVP_MD_CTX_init(&ctx);
154     i = OBJ_obj2nid(a->algorithm);
155     type = EVP_get_digestbyname(OBJ_nid2sn(i));
156     if (type == NULL) {
157         ASN1err(ASN1_F_ASN1_ITEM_VERIFY,
158                 ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
159         goto err;
160     }
161 
162     if (!EVP_VerifyInit_ex(&ctx, type, NULL)) {
163         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
164         ret = 0;
165         goto err;
166     }
167 
168     inl = ASN1_item_i2d(asn, &buf_in, it);
169 
170     if (buf_in == NULL) {
171         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE);
172         goto err;
173     }
174 
175     EVP_VerifyUpdate(&ctx, (unsigned char *)buf_in, inl);
176 
177     OPENSSL_cleanse(buf_in, (unsigned int)inl);
178     OPENSSL_free(buf_in);
179 
180     if (EVP_VerifyFinal(&ctx, (unsigned char *)signature->data,
181                         (unsigned int)signature->length, pkey) <= 0) {
182         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
183         ret = 0;
184         goto err;
185     }
186     /*
187      * we don't need to zero the 'ctx' because we just checked public
188      * information
189      */
190     /* memset(&ctx,0,sizeof(ctx)); */
191     ret = 1;
192  err:
193     EVP_MD_CTX_cleanup(&ctx);
194     return (ret);
195 }
196