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/*
* Copyright (C) 2013 Freie Universität 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.
*/
/**
* @defgroup sys_crypto Crypto
* @ingroup sys
*
* @brief RIOT provides a collection of block cipher ciphers, different
operation modes and cryptographic hash algorithms.
*
* @section ciphers Ciphers
*
* Riot supports the following block ciphers:
* * AES-128
* * 3DES
* * Twofish
* * NULL
*
* You can use them directly by adding "crypto" to your USEMODULE-List.
* While you can use the ciphers functions directly, you should resort to
* the generic API for block ciphers whenever possible.
*
* Additionally you need to set a CFLAG for each cipher you want to use in your Makefile:
* * AES-128: CFLAGS += -DCRYPTO_AES
* * 3DES: CFLAGS += -DCRYPTO_THREEDES
* * Twofish: CFLAGS += -DCRYPTO_TWOFISH
* Setting the CFLAGS initializes a sufficient large buffer size of the cipher_context_t,
* used by the ciphers for en-/de-cryption operations.
*
* Example:
* @code
* #include "crypto/ciphers.h"
*
* cipher_t cipher;
* uint8_t key[AES_KEY_SIZE] = {0},
* plain_text[AES_BLOCK_SIZE] = {0},
* cipher_text[AES_BLOCK_SIZE] = {0};
*
* if (cipher_init(&cipher, CIPHER_AES_128, key, AES_KEY_SIZE) < 0)
* printf("Cipher init failed!\n");
*
* if (cipher_encrypt(&cipher, plain_text, cipher_text) < 0)
* printf("Cipher encryption failed!\n");
* else
* od_hex_dump(cipher_text, AES_BLOCK_SIZE, 0);
*
* @endcode
*
* If you need to encrypt data of arbitrary size take a look at the different
* operation modes like: CBC, CTR or CCM.
*
* Additional examples can be found in the test suite.
*
*/
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