1 /* crypto/asn1/a_verify.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
64 #ifndef NO_SYS_TYPES_H
65 # include <sys/types.h>
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>
76 int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature,
77 char *data, EVP_PKEY *pkey)
81 unsigned char *p, *buf_in = NULL;
84 EVP_MD_CTX_init(&ctx);
85 i = OBJ_obj2nid(a->algorithm);
86 type = EVP_get_digestbyname(OBJ_nid2sn(i));
88 ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
92 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
93 ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
97 inl = i2d(data, NULL);
98 buf_in = OPENSSL_malloc((unsigned int)inl);
100 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE);
106 if (!EVP_VerifyInit_ex(&ctx, type, NULL)) {
107 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB);
111 EVP_VerifyUpdate(&ctx, (unsigned char *)buf_in, inl);
113 OPENSSL_cleanse(buf_in, (unsigned int)inl);
114 OPENSSL_free(buf_in);
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);
123 * we don't need to zero the 'ctx' because we just checked public
126 /* memset(&ctx,0,sizeof(ctx)); */
129 EVP_MD_CTX_cleanup(&ctx);
135 int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a,
136 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey)
140 unsigned char *buf_in = NULL;
141 int ret = -1, i, inl;
144 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER);
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);
153 EVP_MD_CTX_init(&ctx);
154 i = OBJ_obj2nid(a->algorithm);
155 type = EVP_get_digestbyname(OBJ_nid2sn(i));
157 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,
158 ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
162 if (!EVP_VerifyInit_ex(&ctx, type, NULL)) {
163 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
168 inl = ASN1_item_i2d(asn, &buf_in, it);
170 if (buf_in == NULL) {
171 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE);
175 EVP_VerifyUpdate(&ctx, (unsigned char *)buf_in, inl);
177 OPENSSL_cleanse(buf_in, (unsigned int)inl);
178 OPENSSL_free(buf_in);
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);
187 * we don't need to zero the 'ctx' because we just checked public
190 /* memset(&ctx,0,sizeof(ctx)); */
193 EVP_MD_CTX_cleanup(&ctx);