1 /* crypto/asn1/a_verify.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
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.
8 *
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).
15 *
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.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
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)"
40 *
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
51 * SUCH DAMAGE.
52 *
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.]
57 */
58
59 #include <stdio.h>
60 #include <time.h>
61
62 #include "cryptlib.h"
63 #include "asn1_locl.h"
64
65 #ifndef NO_SYS_TYPES_H
66 # include <sys/types.h>
67 #endif
68
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>
74
75 #ifndef NO_ASN1_OLD
76
77 int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature,
78 char *data, EVP_PKEY *pkey)
79 {
80 EVP_MD_CTX ctx;
81 const EVP_MD *type;
82 unsigned char *p,*buf_in=NULL;
83 int ret= -1,i,inl;
84
85 EVP_MD_CTX_init(&ctx);
86 i=OBJ_obj2nid(a->algorithm);
87 type=EVP_get_digestbyname(OBJ_nid2sn(i));
88 if (type == NULL)
89 {
90 ASN1err(ASN1_F_ASN1_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
91 goto err;
92 }
93
94 inl=i2d(data,NULL);
95 buf_in=OPENSSL_malloc((unsigned int)inl);
96 if (buf_in == NULL)
97 {
98 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_MALLOC_FAILURE);
99 goto err;
100 }
101 p=buf_in;
102
103 i2d(data,&p);
104 if (!EVP_VerifyInit_ex(&ctx,type, NULL)
105 || !EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl))
106 {
107 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB);
108 ret=0;
109 goto err;
110 }
111
112 OPENSSL_cleanse(buf_in,(unsigned int)inl);
113 OPENSSL_free(buf_in);
114
115 if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data,
116 (unsigned int)signature->length,pkey) <= 0)
117 {
118 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB);
119 ret=0;
120 goto err;
121 }
122 /* we don't need to zero the 'ctx' because we just checked
123 * public information */
124 /* memset(&ctx,0,sizeof(ctx)); */
125 ret=1;
126 err:
127 EVP_MD_CTX_cleanup(&ctx);
128 return(ret);
129 }
130
131 #endif
132
133
134 int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a,
135 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey)
136 {
137 EVP_MD_CTX ctx;
138 unsigned char *buf_in=NULL;
139 int ret= -1,inl;
140
141 int mdnid, pknid;
142
143 if (!pkey)
144 {
145 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER);
146 return -1;
147 }
148
149 EVP_MD_CTX_init(&ctx);
150
151 /* Convert signature OID into digest and public key OIDs */
152 if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid))
153 {
154 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
155 goto err;
156 }
157 if (mdnid == NID_undef)
158 {
159 if (!pkey->ameth || !pkey->ameth->item_verify)
160 {
161 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
162 goto err;
163 }
164 ret = pkey->ameth->item_verify(&ctx, it, asn, a,
165 signature, pkey);
166 /* Return value of 2 means carry on, anything else means we
167 * exit straight away: either a fatal error of the underlying
168 * verification routine handles all verification.
169 */
170 if (ret != 2)
171 goto err;
172 ret = -1;
173 }
174 else
175 {
176 const EVP_MD *type;
177 type=EVP_get_digestbynid(mdnid);
178 if (type == NULL)
179 {
180 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
181 goto err;
182 }
183
184 /* Check public key OID matches public key type */
185 if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id)
186 {
187 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_WRONG_PUBLIC_KEY_TYPE);
188 goto err;
189 }
190
191 if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey))
192 {
193 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
194 ret=0;
195 goto err;
196 }
197
198 }
199
200 inl = ASN1_item_i2d(asn, &buf_in, it);
201
202 if (buf_in == NULL)
203 {
204 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_MALLOC_FAILURE);
205 goto err;
206 }
207
208 if (!EVP_DigestVerifyUpdate(&ctx,buf_in,inl))
209 {
210 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
211 ret=0;
212 goto err;
213 }
214
215 OPENSSL_cleanse(buf_in,(unsigned int)inl);
216 OPENSSL_free(buf_in);
217
218 if (EVP_DigestVerifyFinal(&ctx,signature->data,
219 (size_t)signature->length) <= 0)
220 {
221 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
222 ret=0;
223 goto err;
224 }
225 /* we don't need to zero the 'ctx' because we just checked
226 * public information */
227 /* memset(&ctx,0,sizeof(ctx)); */
228 ret=1;
229 err:
230 EVP_MD_CTX_cleanup(&ctx);
231 return(ret);
232 }