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 <sys/types.h>
61
62 #include <openssl/bn.h>
63 #include <openssl/digest.h>
64 #include <openssl/err.h>
65 #include <openssl/evp.h>
66 #include <openssl/mem.h>
67 #include <openssl/obj.h>
68
69 #include "internal.h"
70
ASN1_item_verify(const ASN1_ITEM * it,const X509_ALGOR * a,const ASN1_BIT_STRING * signature,void * asn,EVP_PKEY * pkey)71 int ASN1_item_verify(const ASN1_ITEM *it, const X509_ALGOR *a,
72 const ASN1_BIT_STRING *signature, void *asn,
73 EVP_PKEY *pkey) {
74 if (!pkey) {
75 OPENSSL_PUT_ERROR(X509, ERR_R_PASSED_NULL_PARAMETER);
76 return 0;
77 }
78
79 size_t sig_len;
80 if (signature->type == V_ASN1_BIT_STRING) {
81 if (!ASN1_BIT_STRING_num_bytes(signature, &sig_len)) {
82 OPENSSL_PUT_ERROR(X509, X509_R_INVALID_BIT_STRING_BITS_LEFT);
83 return 0;
84 }
85 } else {
86 sig_len = (size_t)ASN1_STRING_length(signature);
87 }
88
89 EVP_MD_CTX ctx;
90 uint8_t *buf_in = NULL;
91 int ret = 0, inl = 0;
92 EVP_MD_CTX_init(&ctx);
93
94 if (!x509_digest_verify_init(&ctx, a, pkey)) {
95 goto err;
96 }
97
98 inl = ASN1_item_i2d(asn, &buf_in, it);
99
100 if (buf_in == NULL) {
101 goto err;
102 }
103
104 if (!EVP_DigestVerify(&ctx, ASN1_STRING_get0_data(signature), sig_len, buf_in,
105 inl)) {
106 OPENSSL_PUT_ERROR(X509, ERR_R_EVP_LIB);
107 goto err;
108 }
109
110 ret = 1;
111
112 err:
113 OPENSSL_free(buf_in);
114 EVP_MD_CTX_cleanup(&ctx);
115 return ret;
116 }
117