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.]
63 #include "asn1_locl.h"
65 #ifndef NO_SYS_TYPES_H
66 # include <sys/types.h>
69 #include <openssl/bn.h>
70 #include <openssl/x509.h>
71 #include <openssl/objects.h>
72 #include <openssl/buffer.h>
73 #include <openssl/evp.h>
77 int ASN1_verify(i2d_of_void
*i2d
, X509_ALGOR
*a
, ASN1_BIT_STRING
*signature
,
78 char *data
, EVP_PKEY
*pkey
)
82 unsigned char *p
,*buf_in
=NULL
;
85 EVP_MD_CTX_init(&ctx
);
86 i
=OBJ_obj2nid(a
->algorithm
);
87 type
=EVP_get_digestbyname(OBJ_nid2sn(i
));
90 ASN1err(ASN1_F_ASN1_VERIFY
,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM
);
95 buf_in
=OPENSSL_malloc((unsigned int)inl
);
98 ASN1err(ASN1_F_ASN1_VERIFY
,ERR_R_MALLOC_FAILURE
);
104 if (!EVP_VerifyInit_ex(&ctx
,type
, NULL
)
105 || !EVP_VerifyUpdate(&ctx
,(unsigned char *)buf_in
,inl
))
107 ASN1err(ASN1_F_ASN1_VERIFY
,ERR_R_EVP_LIB
);
112 OPENSSL_cleanse(buf_in
,(unsigned int)inl
);
113 OPENSSL_free(buf_in
);
115 if (EVP_VerifyFinal(&ctx
,(unsigned char *)signature
->data
,
116 (unsigned int)signature
->length
,pkey
) <= 0)
118 ASN1err(ASN1_F_ASN1_VERIFY
,ERR_R_EVP_LIB
);
122 /* we don't need to zero the 'ctx' because we just checked
123 * public information */
124 /* memset(&ctx,0,sizeof(ctx)); */
127 EVP_MD_CTX_cleanup(&ctx
);
134 int ASN1_item_verify(const ASN1_ITEM
*it
, X509_ALGOR
*a
,
135 ASN1_BIT_STRING
*signature
, void *asn
, EVP_PKEY
*pkey
)
138 unsigned char *buf_in
=NULL
;
143 EVP_MD_CTX_init(&ctx
);
145 /* Convert signature OID into digest and public key OIDs */
146 if (!OBJ_find_sigid_algs(OBJ_obj2nid(a
->algorithm
), &mdnid
, &pknid
))
148 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM
);
151 if (mdnid
== NID_undef
)
153 if (!pkey
->ameth
|| !pkey
->ameth
->item_verify
)
155 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM
);
158 ret
= pkey
->ameth
->item_verify(&ctx
, it
, asn
, a
,
160 /* Return value of 2 means carry on, anything else means we
161 * exit straight away: either a fatal error of the underlying
162 * verification routine handles all verification.
171 type
=EVP_get_digestbynid(mdnid
);
174 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM
);
178 /* Check public key OID matches public key type */
179 if (EVP_PKEY_type(pknid
) != pkey
->ameth
->pkey_id
)
181 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
,ASN1_R_WRONG_PUBLIC_KEY_TYPE
);
185 if (!EVP_DigestVerifyInit(&ctx
, NULL
, type
, NULL
, pkey
))
187 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
,ERR_R_EVP_LIB
);
194 inl
= ASN1_item_i2d(asn
, &buf_in
, it
);
198 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
,ERR_R_MALLOC_FAILURE
);
202 if (!EVP_DigestVerifyUpdate(&ctx
,buf_in
,inl
))
204 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
,ERR_R_EVP_LIB
);
209 OPENSSL_cleanse(buf_in
,(unsigned int)inl
);
210 OPENSSL_free(buf_in
);
212 if (EVP_DigestVerifyFinal(&ctx
,signature
->data
,
213 (size_t)signature
->length
) <= 0)
215 ASN1err(ASN1_F_ASN1_ITEM_VERIFY
,ERR_R_EVP_LIB
);
219 /* we don't need to zero the 'ctx' because we just checked
220 * public information */
221 /* memset(&ctx,0,sizeof(ctx)); */
224 EVP_MD_CTX_cleanup(&ctx
);