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/*
* AES tweaked de/encryption context functions
*
* Copyright (C) 2011-2019, Joachim Metz <joachim.metz@gmail.com>
*
* Refer to AUTHORS for acknowledgements.
*
* This software is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this software. If not, see <http://www.gnu.org/licenses/>.
*/
#if !defined( _LIBCAES_TWEAKED_CONTEXT_H )
#define _LIBCAES_TWEAKED_CONTEXT_H
#include <common.h>
#include <types.h>
#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_EVP_H )
#include <openssl/evp.h>
#endif
#include "libcaes_extern.h"
#include "libcaes_libcerror.h"
#include "libcaes_types.h"
#if defined( __cplusplus )
extern "C" {
#endif
typedef struct libcaes_internal_tweaked_context libcaes_internal_tweaked_context_t;
struct libcaes_internal_tweaked_context
{
#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_EVP_H ) && defined( HAVE_EVP_CRYPTO_AES_XTS )
/* The EVP cipher context
*/
#if defined( HAVE_EVP_CIPHER_CTX_INIT )
EVP_CIPHER_CTX internal_evp_cipher_context;
#endif
EVP_CIPHER_CTX *evp_cipher_context;
/* The key
*/
uint8_t key[ 64 ];
/* The key bit size
*/
size_t key_bit_size;
#else
/* The main de/encryption context
*/
libcaes_context_t *main_context;
/* The tweak encryption context
*/
libcaes_context_t *tweak_context;
#endif /* defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_EVP_H ) && defined( HAVE_EVP_CRYPTO_AES_XTS ) */
};
LIBCAES_EXTERN \
int libcaes_tweaked_context_initialize(
libcaes_tweaked_context_t **tweaked_context,
libcerror_error_t **error );
LIBCAES_EXTERN \
int libcaes_tweaked_context_free(
libcaes_tweaked_context_t **tweaked_context,
libcerror_error_t **error );
LIBCAES_EXTERN \
int libcaes_tweaked_context_set_keys(
libcaes_tweaked_context_t *tweaked_context,
int mode,
const uint8_t *key,
size_t key_bit_size,
const uint8_t *tweak_key,
size_t tweak_key_bit_size,
libcerror_error_t **error );
LIBCAES_EXTERN \
int libcaes_crypt_xts(
libcaes_tweaked_context_t *tweaked_context,
int mode,
const uint8_t *tweak_value,
size_t tweak_value_size,
const uint8_t *input_data,
size_t input_data_size,
uint8_t *output_data,
size_t output_data_size,
libcerror_error_t **error );
#ifdef __cplusplus
}
#endif
#endif /* !defined( _LIBCAES_TWEAKED_CONTEXT_H ) */
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