/* * libewf crypographic digest wrapper code * * Copyright (c) 2006-2007, Joachim Metz <forensics@hoffmannbv.nl>, * Hoffmann Investigations. All rights reserved. * * Refer to AUTHORS for acknowledgements. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * - Redistributions of source code must retain the above copyright notice, *   this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright notice, *   this list of conditions and the following disclaimer in the documentation *   and/or other materials provided with the distribution. * - Neither the name of the creator, related organisations, nor the names of *   its contributors may be used to endorse or promote products derived from *   this software without specific prior written permission. * - All advertising materials mentioning features or use of this software *   must acknowledge the contribution by people stated in the acknowledgements. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER, COMPANY AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */#include "libewf_includes.h"#include "libewf_common.h"#include "libewf_digest_context.h"#include "libewf_notify.h"/* Initializes the digest context * Returns 1 if successful, 0 on failure, -1 on error */int8_t libewf_digest_context_initialize( LIBEWF_DIGEST_CONTEXT* digest_context, uint8_t type ){#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_EVP_H )	const EVP_MD *digest_type = NULL;#elif defined( HAVE_WINCPRYPT_H )	DWORD digest_type   = 0;#endif	if( digest_context == NULL )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_initialize: invalid digest context.\n" );		return( -1 );	}	if( ( type != LIBEWF_DIGEST_CONTEXT_TYPE_MD5 )	 && ( type != LIBEWF_DIGEST_CONTEXT_TYPE_SHA1 ) )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_alloc: unsupported digest context type.\n" );		return( -1 );	}#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_EVP_H )	EVP_MD_CTX_init( digest_context );	if( type == LIBEWF_DIGEST_CONTEXT_TYPE_MD5 )	{		digest_type = EVP_md5();	}	else if( type == LIBEWF_DIGEST_CONTEXT_TYPE_SHA1 )	{		digest_type = EVP_sha1();	}	if( EVP_DigestInit_ex( digest_context, digest_type, NULL ) != 1 )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_initialize: unable to initialize context.\n" );		return( 0 );	}#elif defined( HAVE_WINCPRYPT_H )	digest_context->crypt_provider = 0;	digest_context->hash           = 0;	/* Request the AES crypt provider, fail back to the RSA crypt provider	*/ 	if( CryptAcquireContext( &digest_context->crypt_provider, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT ) == 0 )	{		if( CryptAcquireContext( &digest_context->crypt_provider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT ) == 0 )		{			LIBEWF_WARNING_PRINT( "libewf_digest_context_initialize: unable to create AES or RSA crypt provider.\n" );			return( 0 );		}	}	if( digest_context->crypt_provider == 0 )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_initialize: unable to create crypt provider.\n" );		return( 0 );	}	if( type == LIBEWF_DIGEST_CONTEXT_TYPE_MD5 )	{		digest_type = CALG_MD5;	}	else if( type == LIBEWF_DIGEST_CONTEXT_TYPE_SHA1 )	{		digest_type = CALG_SHA1;	}	if( CryptCreateHash( digest_context->crypt_provider, digest_type, 0, 0, &digest_context->hash ) != 1 ) 	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_initialize: unable to create hash object.\n" );		CryptReleaseContext( digest_context->crypt_provider, 0 );		return( 0 );	}#endif	return( 1 );}/* Updates the digest context * Returns 1 if successful, 0 on failure, -1 on error */int8_t libewf_digest_context_update( LIBEWF_DIGEST_CONTEXT* digest_context, uint8_t *buffer, size_t size ){	if( digest_context == NULL )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_update: invalid digest context.\n" );		return( -1 );	}	if( buffer == NULL )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_update: invalid buffer.\n" );		return( -1 );	}	if( size > (size_t) SSIZE_MAX )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_update: invalid size value exceeds maximum.\n" );		return( -1 );	}#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_EVP_H )	if( EVP_DigestUpdate( digest_context, (const void *) buffer, (unsigned long) size ) != 1 )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_update: unable to update digest hash.\n" );		return( 0 );	}#elif defined( HAVE_WINCPRYPT_H )	if( digest_context->hash == 0 )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_update: invalid digest context - missing hash.\n" );		return( -1 );	}	if( CryptHashData( digest_context->hash, (BYTE *) buffer, (DWORD) size, 0 ) != 1 )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_update: unable to update digest context hash.\n" );		return( 0 );	}#endif	return( 1 );}/* Finalizes the digest context * Returns 1 if successful, 0 on failure, -1 on error */int8_t libewf_digest_context_finalize( LIBEWF_DIGEST_CONTEXT* digest_context, EWF_DIGEST_HASH *digest_hash, size_t *size ){	if( digest_context == NULL )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_finalize: invalid digest context.\n" );		return( -1 );	}	if( digest_hash == NULL )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_finalize: invalid digest hash.\n" );		return( -1 );	}	if( *size > (size_t) SSIZE_MAX )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_finalize: invalid size value exceeds maximum.\n" );		return( -1 );	}#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_EVP_H )	if( EVP_DigestFinal_ex( digest_context, (unsigned char *) digest_hash, (unsigned int *) size  ) != 1 )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_finalize: unable to finalize digest hash.\n" );		return( 0 );	}	if( EVP_MD_CTX_cleanup( digest_context ) != 1 )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_finalize: unable to clean up digest context.\n" );	}#elif defined( HAVE_WINCPRYPT_H )	if( digest_context->hash == 0 )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_finalize: invalid digest context - missing hash.\n" );		return( -1 );	}	if( CryptGetHashParam( digest_context->hash, HP_HASHVAL, (BYTE *) digest_hash, (DWORD *) size, 0 ) != 1 )	{		LIBEWF_WARNING_PRINT( "libewf_digest_context_finalize: unable to finalize digest hash.\n" );		return( 0 );	}	if( digest_context->crypt_provider != 0 )	{		CryptReleaseContext( digest_context->crypt_provider, 0 );	}	if( digest_context->hash != 0 )	{		CryptDestroyHash( digest_context->hash );	}#endif	return( 1 );}