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#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 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) 95 { 96 ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 97 goto err; 98 } 99 100 inl=i2d(data,NULL); 101 buf_in=OPENSSL_malloc((unsigned int)inl); 102 if (buf_in == NULL) 103 { 104 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_MALLOC_FAILURE); 105 goto err; 106 } 107 p=buf_in; 108 109 i2d(data,&p); 110 if (!EVP_VerifyInit_ex(&ctx,type, NULL) 111 || !EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl)) 112 { 113 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB); 114 ret=0; 115 goto err; 116 } 117 118 OPENSSL_cleanse(buf_in,(unsigned int)inl); 119 OPENSSL_free(buf_in); 120 121 if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data, 122 (unsigned int)signature->length,pkey) <= 0) 123 { 124 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB); 125 ret=0; 126 goto err; 127 } 128 /* we don't need to zero the 'ctx' because we just checked 129 * public information */ 130 /* memset(&ctx,0,sizeof(ctx)); */ 131 ret=1; 132err: 133 EVP_MD_CTX_cleanup(&ctx); 134 return(ret); 135 } 136 137#endif 138 139 140int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, 141 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey) 142 { 143 EVP_MD_CTX ctx; 144 unsigned char *buf_in=NULL; 145 int ret= -1,inl; 146 147 int mdnid, pknid; 148 149 if (!pkey) 150 { 151 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER); 152 return -1; 153 } 154 155 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) 156 { 157 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 158 return -1; 159 } 160 161 EVP_MD_CTX_init(&ctx); 162 163 /* Convert signature OID into digest and public key OIDs */ 164 if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) 165 { 166 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); 167 goto err; 168 } 169 if (mdnid == NID_undef) 170 { 171 if (!pkey->ameth || !pkey->ameth->item_verify) 172 { 173 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); 174 goto err; 175 } 176 ret = pkey->ameth->item_verify(&ctx, it, asn, a, 177 signature, pkey); 178 /* Return value of 2 means carry on, anything else means we 179 * exit straight away: either a fatal error of the underlying 180 * verification routine handles all verification. 181 */ 182 if (ret != 2) 183 goto err; 184 ret = -1; 185 } 186 else 187 { 188 const EVP_MD *type; 189 type=EVP_get_digestbynid(mdnid); 190 if (type == NULL) 191 { 192 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); 193 goto err; 194 } 195 196 /* Check public key OID matches public key type */ 197 if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) 198 { 199 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_WRONG_PUBLIC_KEY_TYPE); 200 goto err; 201 } 202 203 if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey)) 204 { 205 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB); 206 ret=0; 207 goto err; 208 } 209 210 } 211 212 inl = ASN1_item_i2d(asn, &buf_in, it); 213 214 if (buf_in == NULL) 215 { 216 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_MALLOC_FAILURE); 217 goto err; 218 } 219 220 if (!EVP_DigestVerifyUpdate(&ctx,buf_in,inl)) 221 { 222 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB); 223 ret=0; 224 goto err; 225 } 226 227 OPENSSL_cleanse(buf_in,(unsigned int)inl); 228 OPENSSL_free(buf_in); 229 230 if (EVP_DigestVerifyFinal(&ctx,signature->data, 231 (size_t)signature->length) <= 0) 232 { 233 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB); 234 ret=0; 235 goto err; 236 } 237 /* we don't need to zero the 'ctx' because we just checked 238 * public information */ 239 /* memset(&ctx,0,sizeof(ctx)); */ 240 ret=1; 241err: 242 EVP_MD_CTX_cleanup(&ctx); 243 return(ret); 244 } 245 246 247