a_verify.c revision 277195
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(i2d_of_void *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 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) 94 { 95 ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 96 goto err; 97 } 98 99 inl=i2d(data,NULL); 100 buf_in=OPENSSL_malloc((unsigned int)inl); 101 if (buf_in == NULL) 102 { 103 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_MALLOC_FAILURE); 104 goto err; 105 } 106 p=buf_in; 107 108 i2d(data,&p); 109 if (!EVP_VerifyInit_ex(&ctx,type, NULL)) 110 { 111 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB); 112 ret=0; 113 goto err; 114 } 115 EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl); 116 117 OPENSSL_cleanse(buf_in,(unsigned int)inl); 118 OPENSSL_free(buf_in); 119 120 if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data, 121 (unsigned int)signature->length,pkey) <= 0) 122 { 123 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB); 124 ret=0; 125 goto err; 126 } 127 /* we don't need to zero the 'ctx' because we just checked 128 * public information */ 129 /* memset(&ctx,0,sizeof(ctx)); */ 130 ret=1; 131err: 132 EVP_MD_CTX_cleanup(&ctx); 133 return(ret); 134 } 135 136#endif 137 138 139int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, ASN1_BIT_STRING *signature, 140 void *asn, EVP_PKEY *pkey) 141 { 142 EVP_MD_CTX ctx; 143 const EVP_MD *type; 144 unsigned char *buf_in=NULL; 145 int ret= -1,i,inl; 146 147 if (!pkey) 148 { 149 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER); 150 return -1; 151 } 152 153 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) 154 { 155 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 156 return -1; 157 } 158 159 EVP_MD_CTX_init(&ctx); 160 i=OBJ_obj2nid(a->algorithm); 161 type=EVP_get_digestbyname(OBJ_nid2sn(i)); 162 if (type == NULL) 163 { 164 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); 165 goto err; 166 } 167 168 if (!EVP_VerifyInit_ex(&ctx,type, NULL)) 169 { 170 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB); 171 ret=0; 172 goto err; 173 } 174 175 inl = ASN1_item_i2d(asn, &buf_in, it); 176 177 if (buf_in == NULL) 178 { 179 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_MALLOC_FAILURE); 180 goto err; 181 } 182 183 EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl); 184 185 OPENSSL_cleanse(buf_in,(unsigned int)inl); 186 OPENSSL_free(buf_in); 187 188 if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data, 189 (unsigned int)signature->length,pkey) <= 0) 190 { 191 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB); 192 ret=0; 193 goto err; 194 } 195 /* we don't need to zero the 'ctx' because we just checked 196 * public information */ 197 /* memset(&ctx,0,sizeof(ctx)); */ 198 ret=1; 199err: 200 EVP_MD_CTX_cleanup(&ctx); 201 return(ret); 202 } 203 204 205