1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #include <openssl/x509.h> 58 59 #include <stdio.h> 60 #include <time.h> 61 #include <sys/types.h> 62 63 #include <openssl/bn.h> 64 #include <openssl/buf.h> 65 #include <openssl/digest.h> 66 #include <openssl/err.h> 67 #include <openssl/evp.h> 68 #include <openssl/mem.h> 69 #include <openssl/obj.h> 70 71 #include "../evp/internal.h" 72 73 74 int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, 75 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey) 76 { 77 EVP_MD_CTX ctx; 78 unsigned char *buf_in=NULL; 79 int ret= -1,inl; 80 const EVP_PKEY_ASN1_METHOD *ameth; 81 82 int mdnid, pknid; 83 84 if (!pkey) 85 { 86 OPENSSL_PUT_ERROR(X509, ASN1_item_verify, ERR_R_PASSED_NULL_PARAMETER); 87 return 1; 88 } 89 90 EVP_MD_CTX_init(&ctx); 91 92 /* Convert signature OID into digest and public key OIDs */ 93 if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) 94 { 95 OPENSSL_PUT_ERROR(X509, ASN1_item_verify, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); 96 goto err; 97 } 98 if (mdnid == NID_undef) 99 { 100 if (!pkey->ameth || !pkey->ameth->item_verify) 101 { 102 OPENSSL_PUT_ERROR(X509, ASN1_item_verify, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); 103 goto err; 104 } 105 ret = pkey->ameth->item_verify(&ctx, it, asn, a, 106 signature, pkey); 107 /* Return value of 2 means carry on, anything else means we 108 * exit straight away: either a fatal error of the underlying 109 * verification routine handles all verification. 110 */ 111 if (ret != 2) 112 goto err; 113 ret = -1; 114 } 115 else 116 { 117 const EVP_MD *type; 118 type=EVP_get_digestbynid(mdnid); 119 if (type == NULL) 120 { 121 OPENSSL_PUT_ERROR(X509, ASN1_item_verify, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); 122 goto err; 123 } 124 125 /* Check public key OID matches public key type */ 126 ameth = EVP_PKEY_asn1_find(NULL, pknid); 127 if (ameth == NULL || ameth->pkey_id != pkey->ameth->pkey_id) 128 { 129 OPENSSL_PUT_ERROR(X509, ASN1_item_verify, ASN1_R_WRONG_PUBLIC_KEY_TYPE); 130 goto err; 131 } 132 133 if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey)) 134 { 135 OPENSSL_PUT_ERROR(X509, ASN1_item_verify, ERR_R_EVP_LIB); 136 ret=0; 137 goto err; 138 } 139 140 } 141 142 inl = ASN1_item_i2d(asn, &buf_in, it); 143 144 if (buf_in == NULL) 145 { 146 OPENSSL_PUT_ERROR(X509, ASN1_item_verify, ERR_R_MALLOC_FAILURE); 147 goto err; 148 } 149 150 if (!EVP_DigestVerifyUpdate(&ctx,buf_in,inl)) 151 { 152 OPENSSL_PUT_ERROR(X509, ASN1_item_verify, ERR_R_EVP_LIB); 153 ret=0; 154 goto err; 155 } 156 157 OPENSSL_cleanse(buf_in,(unsigned int)inl); 158 OPENSSL_free(buf_in); 159 160 if (EVP_DigestVerifyFinal(&ctx,signature->data, 161 (size_t)signature->length) <= 0) 162 { 163 OPENSSL_PUT_ERROR(X509, ASN1_item_verify, ERR_R_EVP_LIB); 164 ret=0; 165 goto err; 166 } 167 /* we don't need to zero the 'ctx' because we just checked 168 * public information */ 169 /* memset(&ctx,0,sizeof(ctx)); */ 170 ret=1; 171 err: 172 EVP_MD_CTX_cleanup(&ctx); 173 return(ret); 174 } 175 176
