a_verify.c revision 296465
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 ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); 89 goto err; 90 } 91 92 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) { 93 ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 94 goto err; 95 } 96 97 inl = i2d(data, NULL); 98 buf_in = OPENSSL_malloc((unsigned int)inl); 99 if (buf_in == NULL) { 100 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE); 101 goto err; 102 } 103 p = buf_in; 104 105 i2d(data, &p); 106 if (!EVP_VerifyInit_ex(&ctx, type, NULL)) { 107 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB); 108 ret = 0; 109 goto err; 110 } 111 EVP_VerifyUpdate(&ctx, (unsigned char *)buf_in, inl); 112 113 OPENSSL_cleanse(buf_in, (unsigned int)inl); 114 OPENSSL_free(buf_in); 115 116 if (EVP_VerifyFinal(&ctx, (unsigned char *)signature->data, 117 (unsigned int)signature->length, pkey) <= 0) { 118 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB); 119 ret = 0; 120 goto err; 121 } 122 /* 123 * we don't need to zero the 'ctx' because we just checked public 124 * information 125 */ 126 /* memset(&ctx,0,sizeof(ctx)); */ 127 ret = 1; 128 err: 129 EVP_MD_CTX_cleanup(&ctx); 130 return (ret); 131} 132 133#endif 134 135int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, 136 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey) 137{ 138 EVP_MD_CTX ctx; 139 const EVP_MD *type; 140 unsigned char *buf_in = NULL; 141 int ret = -1, i, inl; 142 143 if (!pkey) { 144 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER); 145 return -1; 146 } 147 148 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) { 149 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 150 return -1; 151 } 152 153 EVP_MD_CTX_init(&ctx); 154 i = OBJ_obj2nid(a->algorithm); 155 type = EVP_get_digestbyname(OBJ_nid2sn(i)); 156 if (type == NULL) { 157 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, 158 ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); 159 goto err; 160 } 161 162 if (!EVP_VerifyInit_ex(&ctx, type, NULL)) { 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 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE); 172 goto err; 173 } 174 175 EVP_VerifyUpdate(&ctx, (unsigned char *)buf_in, inl); 176 177 OPENSSL_cleanse(buf_in, (unsigned int)inl); 178 OPENSSL_free(buf_in); 179 180 if (EVP_VerifyFinal(&ctx, (unsigned char *)signature->data, 181 (unsigned int)signature->length, pkey) <= 0) { 182 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB); 183 ret = 0; 184 goto err; 185 } 186 /* 187 * we don't need to zero the 'ctx' because we just checked public 188 * information 189 */ 190 /* memset(&ctx,0,sizeof(ctx)); */ 191 ret = 1; 192 err: 193 EVP_MD_CTX_cleanup(&ctx); 194 return (ret); 195} 196