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/*
* AES de/encryption context functions
*
* Copyright (C) 2011-2024, Joachim Metz <joachim.metz@gmail.com>
*
* Refer to AUTHORS for acknowledgements.
*
* This program 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 program 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 program. If not, see <https://www.gnu.org/licenses/>.
*/
#if !defined( _LIBCAES_CONTEXT_H )
#define _LIBCAES_CONTEXT_H
#include <common.h>
#include <types.h>
#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_AES_H )
#include <openssl/aes.h>
#elif 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_context libcaes_internal_context_t;
struct libcaes_internal_context
{
#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_AES_H ) && ( defined( HAVE_AES_CBC_ENCRYPT ) || defined( HAVE_AES_ECB_ENCRYPT ) )
/* The AES key
*/
AES_KEY key;
#elif defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_EVP_H ) && ( defined( HAVE_EVP_CRYPTO_AES_CBC ) || defined( HAVE_EVP_CRYPTO_AES_ECB ) )
/* 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[ 32 ];
/* The key bit size
*/
size_t key_bit_size;
#else
/* The number of round keys
*/
uint8_t number_of_round_keys;
/* The round keys
*/
uint32_t *round_keys;
/* The round keys data
*/
uint32_t round_keys_data[ 68 ];
#endif /* defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_AES_H ) && ( defined( HAVE_AES_CBC_ENCRYPT ) || defined( HAVE_AES_ECB_ENCRYPT ) ) */
};
LIBCAES_EXTERN \
int libcaes_context_initialize(
libcaes_context_t **context,
libcerror_error_t **error );
LIBCAES_EXTERN \
int libcaes_context_free(
libcaes_context_t **context,
libcerror_error_t **error );
LIBCAES_EXTERN \
int libcaes_context_set_key(
libcaes_context_t *context,
int mode,
const uint8_t *key,
size_t key_bit_size,
libcerror_error_t **error );
#if !defined( LIBCAES_HAVE_AES_SUPPORT )
int libcaes_initialize_tables(
libcerror_error_t **error );
int libcaes_internal_context_set_decryption_key(
libcaes_internal_context_t *internal_context,
const uint8_t *key,
size_t key_bit_size,
libcerror_error_t **error );
int libcaes_internal_context_set_encryption_key(
libcaes_internal_context_t *internal_context,
const uint8_t *key,
size_t key_bit_size,
libcerror_error_t **error );
#endif /* !defined( LIBCAES_HAVE_AES_SUPPORT ) */
LIBCAES_EXTERN \
int libcaes_crypt_cbc(
libcaes_context_t *context,
int mode,
const uint8_t *initialization_vector,
size_t initialization_vector_size,
const uint8_t *input_data,
size_t input_data_size,
uint8_t *output_data,
size_t output_data_size,
libcerror_error_t **error );
LIBCAES_EXTERN \
int libcaes_crypt_ccm(
libcaes_context_t *context,
int mode,
const uint8_t *nonce,
size_t nonce_size,
const uint8_t *input_data,
size_t input_data_size,
uint8_t *output_data,
size_t output_data_size,
libcerror_error_t **error );
LIBCAES_EXTERN \
int libcaes_crypt_cfb(
libcaes_context_t *context,
int mode,
const uint8_t *initialization_vector,
size_t initialization_vector_size,
const uint8_t *input_data,
size_t input_data_size,
uint8_t *output_data,
size_t output_data_size,
libcerror_error_t **error );
LIBCAES_EXTERN \
int libcaes_crypt_ecb(
libcaes_context_t *context,
int mode,
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_CONTEXT_H ) */
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