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>
73 #include "asn1_locl.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);
105 EVP_VerifyInit_ex(&ctx,type, NULL)
106 && EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl);
108 OPENSSL_cleanse(buf_in,(unsigned int)inl);
109 OPENSSL_free(buf_in);
113 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB);
119 if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data,
120 (unsigned int)signature->length,pkey) <= 0)
122 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB);
126 /* we don't need to zero the 'ctx' because we just checked
127 * public information */
128 /* memset(&ctx,0,sizeof(ctx)); */
131 EVP_MD_CTX_cleanup(&ctx);
138 int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a,
139 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey)
142 unsigned char *buf_in=NULL;
149 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER);
153 EVP_MD_CTX_init(&ctx);
155 /* Convert signature OID into digest and public key OIDs */
156 if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid))
158 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
161 if (mdnid == NID_undef)
163 if (!pkey->ameth || !pkey->ameth->item_verify)
165 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
168 ret = pkey->ameth->item_verify(&ctx, it, asn, a,
170 /* Return value of 2 means carry on, anything else means we
171 * exit straight away: either a fatal error of the underlying
172 * verification routine handles all verification.
181 type=EVP_get_digestbynid(mdnid);
184 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
188 /* Check public key OID matches public key type */
189 if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id)
191 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_WRONG_PUBLIC_KEY_TYPE);
195 if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey))
197 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
204 inl = ASN1_item_i2d(asn, &buf_in, it);
208 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_MALLOC_FAILURE);
212 ret = EVP_DigestVerifyUpdate(&ctx,buf_in,inl);
214 OPENSSL_cleanse(buf_in,(unsigned int)inl);
215 OPENSSL_free(buf_in);
219 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
224 if (EVP_DigestVerifyFinal(&ctx,signature->data,
225 (size_t)signature->length) <= 0)
227 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
231 /* we don't need to zero the 'ctx' because we just checked
232 * public information */
233 /* memset(&ctx,0,sizeof(ctx)); */
236 EVP_MD_CTX_cleanup(&ctx);