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/*
* Copyright (C) 2015 Freie Universitรคt Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup sys_crypto
* @{
*
* @file cbc.h
* @brief Cipher block chaining mode of operation for block ciphers
*
* @author Freie Universitaet Berlin, Computer Systems & Telematics
* @author Nico von Geyso <nico.geyso@fu-berlin.de>
*/
#ifndef CRYPTO_MODES_CBC_H_
#define CRYPTO_MODES_CBC_H_
#include "crypto/ciphers.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Encrypt data of arbitrary length in cipher block chaining mode.
*
* @param cipher Already initialized cipher struct
* @param iv 16 octet initialization vector. Must never be used more
* than once for a given key.
* @param input pointer to input data to encrypt
* @param input_len length of the input data
* @param output pointer to allocated memory for encrypted data. It has to
* be of size data_len + BLOCK_SIZE - data_len % BLOCK_SIZE.
*/
int cipher_encrypt_cbc(cipher_t* cipher, uint8_t iv[16], uint8_t* input,
size_t input_len, uint8_t* output);
/**
* @brief Decrypt encrypted data in cipher block chaining mode.
*
* @param cipher Already initialized cipher struct
* @param iv 16 octet initialization vector.
* @param input pointer to input data to decrypt
* @param input_len length of the input data
* @param output pointer to allocated memory for plaintext data. It has to
* be of size input_len.
*/
int cipher_decrypt_cbc(cipher_t* cipher, uint8_t iv[16], uint8_t* input,
size_t input_len, uint8_t* output);
#ifdef __cplusplus
}
#endif
#endif /* CRYPTO_MODES_CBC_H_ */
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