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