1 /* $OpenBSD: a_verify.c,v 1.21 2015/01/28 04:14:31 beck Exp $ */
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.]
59 #include <sys/types.h>
65 #include <openssl/bn.h>
66 #include <openssl/buffer.h>
67 #include <openssl/err.h>
68 #include <openssl/evp.h>
69 #include <openssl/objects.h>
70 #include <openssl/x509.h>
72 #include "asn1_locl.h"
75 ASN1_item_verify(const ASN1_ITEM
*it
, X509_ALGOR
*a
,
76 ASN1_BIT_STRING
*signature
, void *asn
, EVP_PKEY
*pkey
)
79 unsigned char *buf_in
= NULL
;
85 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
, ERR_R_PASSED_NULL_PARAMETER
);
89 if (signature
->type
== V_ASN1_BIT_STRING
&& signature
->flags
& 0x7)
91 ASN1err(ASN1_F_ASN1_VERIFY
,
92 ASN1_R_INVALID_BIT_STRING_BITS_LEFT
);
96 EVP_MD_CTX_init(&ctx
);
98 /* Convert signature OID into digest and public key OIDs */
99 if (!OBJ_find_sigid_algs(OBJ_obj2nid(a
->algorithm
), &mdnid
, &pknid
)) {
100 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
,
101 ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM
);
104 if (mdnid
== NID_undef
) {
105 if (!pkey
->ameth
|| !pkey
->ameth
->item_verify
) {
106 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
,
107 ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM
);
110 ret
= pkey
->ameth
->item_verify(&ctx
, it
, asn
, a
,
112 /* Return value of 2 means carry on, anything else means we
113 * exit straight away: either a fatal error of the underlying
114 * verification routine handles all verification.
121 type
= EVP_get_digestbynid(mdnid
);
123 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
,
124 ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM
);
128 /* Check public key OID matches public key type */
129 if (EVP_PKEY_type(pknid
) != pkey
->ameth
->pkey_id
) {
130 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
,
131 ASN1_R_WRONG_PUBLIC_KEY_TYPE
);
135 if (!EVP_DigestVerifyInit(&ctx
, NULL
, type
, NULL
, pkey
)) {
136 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
, ERR_R_EVP_LIB
);
143 inl
= ASN1_item_i2d(asn
, &buf_in
, it
);
145 if (buf_in
== NULL
) {
146 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
, ERR_R_MALLOC_FAILURE
);
150 if (!EVP_DigestVerifyUpdate(&ctx
, buf_in
, inl
)) {
151 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
, ERR_R_EVP_LIB
);
156 explicit_bzero(buf_in
, (unsigned int)inl
);
159 if (EVP_DigestVerifyFinal(&ctx
, signature
->data
,
160 (size_t)signature
->length
) <= 0) {
161 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
, ERR_R_EVP_LIB
);
165 /* we don't need to zero the 'ctx' because we just checked
166 * public information */
167 /* memset(&ctx,0,sizeof(ctx)); */
171 EVP_MD_CTX_cleanup(&ctx
);