/*
 * 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 ) */

