/*
 * Library to support support file format date and time values
 *
 * Copyright (C) 2011-2023, 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_H )
#define _LIBCAES_H

#include <libcaes/definitions.h>
#include <libcaes/error.h>
#include <libcaes/extern.h>
#include <libcaes/features.h>
#include <libcaes/types.h>

#include <stdio.h>

#if defined( __cplusplus )
extern "C" {
#endif

/* -------------------------------------------------------------------------
 * Support functions
 * ------------------------------------------------------------------------- */

/* Returns the library version
 */
LIBCAES_EXTERN \
const char *libcaes_get_version(
             void );

/* -------------------------------------------------------------------------
 * Error functions
 * ------------------------------------------------------------------------- */

/* Frees an error
 */
LIBCAES_EXTERN \
void libcaes_error_free(
      libcaes_error_t **error );

/* Prints a descriptive string of the error to the stream
 * Returns the amount of printed characters if successful or -1 on error
 */
LIBCAES_EXTERN \
int libcaes_error_fprint(
     libcaes_error_t *error,
     FILE *stream );

/* Prints a descriptive string of the error to the string
 * The end-of-string character is not included in the return value
 * Returns the amount of printed characters if successful or -1 on error
 */
LIBCAES_EXTERN \
int libcaes_error_sprint(
     libcaes_error_t *error,
     char *string,
     size_t size );

/* Prints a backtrace of the error to the stream
 * Returns the amount of printed characters if successful or -1 on error
 */
LIBCAES_EXTERN \
int libcaes_error_backtrace_fprint(
     libcaes_error_t *error,
     FILE *stream );

/* Prints a backtrace of the error to the string
 * The end-of-string character is not included in the return value
 * Returns the amount of printed characters if successful or -1 on error
 */
LIBCAES_EXTERN \
int libcaes_error_backtrace_sprint(
     libcaes_error_t *error,
     char *string,
     size_t size );

/* -------------------------------------------------------------------------
 * Context functions
 * ------------------------------------------------------------------------- */

/* Creates a context
 * Make sure the value context is referencing, is set to NULL
 * Returns 1 if successful or -1 on error
 */
LIBCAES_EXTERN \
int libcaes_context_initialize(
     libcaes_context_t **context,
     libcaes_error_t **error );

/* Frees a context
 * Returns 1 if successful or -1 on error
 */
LIBCAES_EXTERN \
int libcaes_context_free(
     libcaes_context_t **context,
     libcaes_error_t **error );

/* Sets the key
 * Returns 1 if successful or -1 on error
 */
LIBCAES_EXTERN \
int libcaes_context_set_key(
     libcaes_context_t *context,
     int mode,
     const uint8_t *key,
     size_t key_bit_size,
     libcaes_error_t **error );

/* De- or encrypts a block of data using AES-CBC (Cipher Block Chaining)
 * The size must be a multitude of the AES block size (16 byte)
 * Returns 1 if successful or -1 on error
 */
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,
     libcaes_error_t **error );

/* De- or encrypts a block of data using AES-CCM (Counter with CBC-MAC)
 * Note that the key must be set in encryption mode (LIBCAES_CRYPT_MODE_ENCRYPT) for both de- and encryption.
 * Returns 1 if successful or -1 on 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,
     libcaes_error_t **error );

/* De- or encrypts a block of data using AES-ECB (Electronic CodeBook)
 * The size must be a multitude of the AES block size (16 byte)
 * Returns 1 if successful or -1 on 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,
     libcaes_error_t **error );

/* -------------------------------------------------------------------------
 * Tweaked context functions
 * ------------------------------------------------------------------------- */

/* Creates a tweaked context
 * Make sure the value tweaked context is referencing, is set to NULL
 * Returns 1 if successful or -1 on error
 */
LIBCAES_EXTERN \
int libcaes_tweaked_context_initialize(
     libcaes_tweaked_context_t **tweaked_context,
     libcaes_error_t **error );

/* Frees a tweaked context
 * Returns 1 if successful or -1 on error
 */
LIBCAES_EXTERN \
int libcaes_tweaked_context_free(
     libcaes_tweaked_context_t **tweaked_context,
     libcaes_error_t **error );

/* Sets the keys
 * Returns 1 if successful or -1 on 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,
     libcaes_error_t **error );

/* De- or encrypts a block of data using AES-XTS (XEX-based tweaked-codebook mode with ciphertext stealing)
 * The size must be a multitude of the AES block size (16 byte)
 * Returns 1 if successful or -1 on 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,
     libcaes_error_t **error );

#if defined( __cplusplus )
}
#endif

#endif /* !defined( _LIBCAES_H ) */

