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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 
ASN1_verify(i2d_of_void * i2d,X509_ALGOR * a,ASN1_BIT_STRING * signature,char * data,EVP_PKEY * pkey)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 
ASN1_item_verify(const ASN1_ITEM * it,X509_ALGOR * a,ASN1_BIT_STRING * signature,void * asn,EVP_PKEY * pkey)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 	EVP_MD_CTX_init(&ctx);
144 
145 	/* Convert signature OID into digest and public key OIDs */
146 	if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid))
147 		{
148 		ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
149 		goto err;
150 		}
151 	if (mdnid == NID_undef)
152 		{
153 		if (!pkey->ameth || !pkey->ameth->item_verify)
154 			{
155 			ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
156 			goto err;
157 			}
158 		ret = pkey->ameth->item_verify(&ctx, it, asn, a,
159 							signature, pkey);
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.
163 		 */
164 		if (ret != 2)
165 			goto err;
166 		ret = -1;
167 		}
168 	else
169 		{
170 		const EVP_MD *type;
171 		type=EVP_get_digestbynid(mdnid);
172 		if (type == NULL)
173 			{
174 			ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
175 			goto err;
176 			}
177 
178 		/* Check public key OID matches public key type */
179 		if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id)
180 			{
181 			ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_WRONG_PUBLIC_KEY_TYPE);
182 			goto err;
183 			}
184 
185 		if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey))
186 			{
187 			ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
188 			ret=0;
189 			goto err;
190 			}
191 
192 		}
193 
194 	inl = ASN1_item_i2d(asn, &buf_in, it);
195 
196 	if (buf_in == NULL)
197 		{
198 		ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_MALLOC_FAILURE);
199 		goto err;
200 		}
201 
202 	if (!EVP_DigestVerifyUpdate(&ctx,buf_in,inl))
203 		{
204 		ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
205 		ret=0;
206 		goto err;
207 		}
208 
209 	OPENSSL_cleanse(buf_in,(unsigned int)inl);
210 	OPENSSL_free(buf_in);
211 
212 	if (EVP_DigestVerifyFinal(&ctx,signature->data,
213 			(size_t)signature->length) <= 0)
214 		{
215 		ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
216 		ret=0;
217 		goto err;
218 		}
219 	/* we don't need to zero the 'ctx' because we just checked
220 	 * public information */
221 	/* memset(&ctx,0,sizeof(ctx)); */
222 	ret=1;
223 err:
224 	EVP_MD_CTX_cleanup(&ctx);
225 	return(ret);
226 	}
227 
228 
229