1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay@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@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@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@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 74int 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 uint8_t *buf_in = NULL; 79 int ret = 0, inl; 80 81 if (!pkey) 82 { 83 OPENSSL_PUT_ERROR(X509, ERR_R_PASSED_NULL_PARAMETER); 84 return 0; 85 } 86 87 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) 88 { 89 OPENSSL_PUT_ERROR(X509, X509_R_INVALID_BIT_STRING_BITS_LEFT); 90 return 0; 91 } 92 93 EVP_MD_CTX_init(&ctx); 94 95 if (!EVP_DigestVerifyInitFromAlgorithm(&ctx, a, pkey)) 96 { 97 goto err; 98 } 99 100 inl = ASN1_item_i2d(asn, &buf_in, it); 101 102 if (buf_in == NULL) 103 { 104 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE); 105 goto err; 106 } 107 108 if (!EVP_DigestVerifyUpdate(&ctx,buf_in,inl)) 109 { 110 OPENSSL_cleanse(buf_in,(unsigned int)inl); 111 OPENSSL_free(buf_in); 112 OPENSSL_PUT_ERROR(X509, ERR_R_EVP_LIB); 113 goto err; 114 } 115 116 OPENSSL_cleanse(buf_in,(unsigned int)inl); 117 OPENSSL_free(buf_in); 118 119 if (EVP_DigestVerifyFinal(&ctx,signature->data, 120 (size_t)signature->length) <= 0) 121 { 122 OPENSSL_PUT_ERROR(X509, ERR_R_EVP_LIB); 123 goto err; 124 } 125 /* we don't need to zero the 'ctx' because we just checked 126 * public information */ 127 /* memset(&ctx,0,sizeof(ctx)); */ 128 ret = 1; 129err: 130 EVP_MD_CTX_cleanup(&ctx); 131 return ret; 132 } 133 134