a_verify.c revision 296341
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 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 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 ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 95 goto err; 96 } 97 98 inl = i2d(data, NULL); 99 buf_in = OPENSSL_malloc((unsigned int)inl); 100 if (buf_in == NULL) { 101 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE); 102 goto err; 103 } 104 p = buf_in; 105 106 i2d(data, &p); 107 if (!EVP_VerifyInit_ex(&ctx, type, NULL) 108 || !EVP_VerifyUpdate(&ctx, (unsigned char *)buf_in, inl)) { 109 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB); 110 ret = 0; 111 goto err; 112 } 113 114 OPENSSL_cleanse(buf_in, (unsigned int)inl); 115 OPENSSL_free(buf_in); 116 117 if (EVP_VerifyFinal(&ctx, (unsigned char *)signature->data, 118 (unsigned int)signature->length, pkey) <= 0) { 119 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB); 120 ret = 0; 121 goto err; 122 } 123 /* 124 * we don't need to zero the 'ctx' because we just checked public 125 * information 126 */ 127 /* memset(&ctx,0,sizeof(ctx)); */ 128 ret = 1; 129 err: 130 EVP_MD_CTX_cleanup(&ctx); 131 return (ret); 132} 133 134#endif 135 136int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, 137 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey) 138{ 139 EVP_MD_CTX ctx; 140 unsigned char *buf_in = NULL; 141 int ret = -1, inl; 142 143 int mdnid, pknid; 144 145 if (!pkey) { 146 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER); 147 return -1; 148 } 149 150 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) { 151 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 152 return -1; 153 } 154 155 EVP_MD_CTX_init(&ctx); 156 157 /* Convert signature OID into digest and public key OIDs */ 158 if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) { 159 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); 160 goto err; 161 } 162 if (mdnid == NID_undef) { 163 if (!pkey->ameth || !pkey->ameth->item_verify) { 164 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, 165 ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); 166 goto err; 167 } 168 ret = pkey->ameth->item_verify(&ctx, it, asn, a, signature, pkey); 169 /* 170 * Return value of 2 means carry on, anything else means we exit 171 * straight away: either a fatal error of the underlying verification 172 * routine handles all verification. 173 */ 174 if (ret != 2) 175 goto err; 176 ret = -1; 177 } else { 178 const EVP_MD *type; 179 type = EVP_get_digestbynid(mdnid); 180 if (type == NULL) { 181 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, 182 ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); 183 goto err; 184 } 185 186 /* Check public key OID matches public key type */ 187 if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) { 188 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_WRONG_PUBLIC_KEY_TYPE); 189 goto err; 190 } 191 192 if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey)) { 193 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB); 194 ret = 0; 195 goto err; 196 } 197 198 } 199 200 inl = ASN1_item_i2d(asn, &buf_in, it); 201 202 if (buf_in == NULL) { 203 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE); 204 goto err; 205 } 206 207 if (!EVP_DigestVerifyUpdate(&ctx, buf_in, inl)) { 208 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB); 209 ret = 0; 210 goto err; 211 } 212 213 OPENSSL_cleanse(buf_in, (unsigned int)inl); 214 OPENSSL_free(buf_in); 215 216 if (EVP_DigestVerifyFinal(&ctx, signature->data, 217 (size_t)signature->length) <= 0) { 218 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB); 219 ret = 0; 220 goto err; 221 } 222 /* 223 * we don't need to zero the 'ctx' because we just checked public 224 * information 225 */ 226 /* memset(&ctx,0,sizeof(ctx)); */ 227 ret = 1; 228 err: 229 EVP_MD_CTX_cleanup(&ctx); 230 return (ret); 231} 232