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 64#ifndef NO_SYS_TYPES_H 65# include <sys/types.h> 66#endif 67 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 74#ifndef NO_ASN1_OLD 75 76int ASN1_verify(int (*i2d)(), X509_ALGOR *a, ASN1_BIT_STRING *signature, 77 char *data, EVP_PKEY *pkey) 78 { 79 EVP_MD_CTX ctx; 80 const EVP_MD *type; 81 unsigned char *p,*buf_in=NULL; 82 int ret= -1,i,inl; 83 84 EVP_MD_CTX_init(&ctx); 85 i=OBJ_obj2nid(a->algorithm); 86 type=EVP_get_digestbyname(OBJ_nid2sn(i)); 87 if (type == NULL) 88 { 89 ASN1err(ASN1_F_ASN1_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); 90 goto err; 91 } 92 93 inl=i2d(data,NULL); 94 buf_in=OPENSSL_malloc((unsigned int)inl); 95 if (buf_in == NULL) 96 { 97 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_MALLOC_FAILURE); 98 goto err; 99 } 100 p=buf_in; 101 102 i2d(data,&p); 103 EVP_VerifyInit_ex(&ctx,type, NULL); 104 EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl); 105 106 OPENSSL_cleanse(buf_in,(unsigned int)inl); 107 OPENSSL_free(buf_in); 108 109 if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data, 110 (unsigned int)signature->length,pkey) <= 0) 111 { 112 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB); 113 ret=0; 114 goto err; 115 } 116 /* we don't need to zero the 'ctx' because we just checked 117 * public information */ 118 /* memset(&ctx,0,sizeof(ctx)); */ 119 ret=1; 120err: 121 EVP_MD_CTX_cleanup(&ctx); 122 return(ret); 123 } 124 125#endif 126 127 128int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, ASN1_BIT_STRING *signature, 129 void *asn, EVP_PKEY *pkey) 130 { 131 EVP_MD_CTX ctx; 132 const EVP_MD *type; 133 unsigned char *buf_in=NULL; 134 int ret= -1,i,inl; 135 136 EVP_MD_CTX_init(&ctx); 137 i=OBJ_obj2nid(a->algorithm); 138 type=EVP_get_digestbyname(OBJ_nid2sn(i)); 139 if (type == NULL) 140 { 141 ASN1err(ASN1_F_ASN1_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); 142 goto err; 143 } 144 145 if (!EVP_VerifyInit_ex(&ctx,type, NULL)) 146 { 147 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB); 148 ret=0; 149 goto err; 150 } 151 152 inl = ASN1_item_i2d(asn, &buf_in, it); 153 154 if (buf_in == NULL) 155 { 156 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_MALLOC_FAILURE); 157 goto err; 158 } 159 160 EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl); 161 162 OPENSSL_cleanse(buf_in,(unsigned int)inl); 163 OPENSSL_free(buf_in); 164 165 if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data, 166 (unsigned int)signature->length,pkey) <= 0) 167 { 168 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB); 169 ret=0; 170 goto err; 171 } 172 /* we don't need to zero the 'ctx' because we just checked 173 * public information */ 174 /* memset(&ctx,0,sizeof(ctx)); */ 175 ret=1; 176err: 177 EVP_MD_CTX_cleanup(&ctx); 178 return(ret); 179 } 180 181 182