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 <openssl/local/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 77int 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 EVP_VerifyInit_ex(&ctx,type, NULL); 105 EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl); 106 107 OPENSSL_cleanse(buf_in,(unsigned int)inl); 108 OPENSSL_free(buf_in); 109 110 if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data, 111 (unsigned int)signature->length,pkey) <= 0) 112 { 113 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB); 114 ret=0; 115 goto err; 116 } 117 /* we don't need to zero the 'ctx' because we just checked 118 * public information */ 119 /* memset(&ctx,0,sizeof(ctx)); */ 120 ret=1; 121err: 122 EVP_MD_CTX_cleanup(&ctx); 123 return(ret); 124 } 125 126#endif 127 128 129int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, ASN1_BIT_STRING *signature, 130 void *asn, EVP_PKEY *pkey) 131 { 132 EVP_MD_CTX ctx; 133 const EVP_MD *type = NULL; 134 unsigned char *buf_in=NULL; 135 int ret= -1,inl; 136 137 int mdnid, pknid; 138 139 EVP_MD_CTX_init(&ctx); 140 141 /* Convert signature OID into digest and public key OIDs */ 142 if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) 143 { 144 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); 145 goto err; 146 } 147 type=EVP_get_digestbynid(mdnid); 148 if (type == NULL) 149 { 150 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); 151 goto err; 152 } 153 154 /* Check public key OID matches public key type */ 155 if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) 156 { 157 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_WRONG_PUBLIC_KEY_TYPE); 158 goto err; 159 } 160 161 if (!EVP_VerifyInit_ex(&ctx,type, NULL)) 162 { 163 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB); 164 ret=0; 165 goto err; 166 } 167 168 inl = ASN1_item_i2d(asn, &buf_in, it); 169 170 if (buf_in == NULL) 171 { 172 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_MALLOC_FAILURE); 173 goto err; 174 } 175 176 EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl); 177 178 OPENSSL_cleanse(buf_in,(unsigned int)inl); 179 OPENSSL_free(buf_in); 180 181 if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data, 182 (unsigned int)signature->length,pkey) <= 0) 183 { 184 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB); 185 ret=0; 186 goto err; 187 } 188 /* we don't need to zero the 'ctx' because we just checked 189 * public information */ 190 /* memset(&ctx,0,sizeof(ctx)); */ 191 ret=1; 192err: 193 EVP_MD_CTX_cleanup(&ctx); 194 return(ret); 195 } 196 197 198