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128 lines
3.8 KiB
C
128 lines
3.8 KiB
C
/*
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* Copyright (C) 2013 Freie Universität Berlin, Computer Systems & Telematics
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup sys_crypto
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* @{
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*
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* @file ciphers.h
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* @brief Headers for the packet encryption class. They are used to encrypt single packets.
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*
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* @author Freie Universitaet Berlin, Computer Systems & Telematics
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* @author Nicolai Schmittberger <nicolai.schmittberger@fu-berlin.de>
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* @author Zakaria Kasmi <zkasmi@inf.fu-berlin.de>
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* @author Mark Essien <markessien@gmail.com>
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*/
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#ifndef __CIPHERS_H_
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#define __CIPHERS_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Shared header file for all cipher algorithms */
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/* Set the algorithms that should be compiled in here. When these defines
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* are set, then packets will be compiled 5 times.
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*
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* */
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#define AES
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// #define RC5
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// #define THREEDES
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// #define AES
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// #define TWOFISH
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// #define SKIPJACK
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/// the length of keys in bytes
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#define PARSEC_MAX_BLOCK_CIPHERS 5
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#define CIPHERS_KEYSIZE 20
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/**
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* @brief the context for cipher-operations
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* always order by number of bytes descending!!! <br>
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* rc5 needs 104 bytes <br>
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* threedes needs 24 bytes <br>
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* aes needs PARSEC_KEYSIZE bytes <br>
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* twofish needs PARSEC_KEYSIZE bytes <br>
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* skipjack needs 20 bytes <br>
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* identity needs 1 byte <br>
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*/
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typedef struct {
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#if defined(RC5)
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uint8_t context[104]; // supports RC5 and lower
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#elif defined(THREEDES)
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uint8_t context[24]; // supports ThreeDES and lower
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#elif defined(AES)
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uint8_t context[CIPHERS_KEYSIZE]; // supports AES and lower
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#elif defined(TWOFISH)
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uint8_t context[CIPHERS_KEYSIZE]; // supports TwoFish and lower
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#elif defined(SKIPJACK)
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uint8_t context[20]; // supports SkipJack and lower
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#endif
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} cipher_context_t;
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/**
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* @brief BlockCipher-Interface for the Cipher-Algorithms
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*/
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typedef struct {
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char name[10];
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// the init function
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int (*BlockCipher_init)(cipher_context_t *context, uint8_t blockSize,
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uint8_t keySize, uint8_t *key);
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// the encrypt function
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int (*BlockCipher_encrypt)(cipher_context_t *context, uint8_t *plainBlock,
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uint8_t *cipherBlock);
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// the decrypt function
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int (*BlockCipher_decrypt)(cipher_context_t *context, uint8_t *cipherBlock,
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uint8_t *plainBlock);
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// the setupKey function
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int (*setupKey)(cipher_context_t *context, uint8_t *key, uint8_t keysize);
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// read the BlockSize of this Cipher
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uint8_t (*BlockCipherInfo_getPreferredBlockSize)(void);
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} block_cipher_interface_t;
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typedef struct CipherModeContext {
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cipher_context_t cc; // CipherContext for the cipher-operations
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uint8_t context[24]; // context for the block-cipher-modes'
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// internal functions
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//CBCModeContext* context;
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} CipherModeContext;
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/**
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* @brief struct for an archive of all available ciphers
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*/
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typedef struct {
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// the number of available ciphers
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uint8_t NoCiphers;
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// the ciphers in form or BlockCipherInterface_ts
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block_cipher_interface_t ciphers[PARSEC_MAX_BLOCK_CIPHERS];
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} block_cipher_archive_t;
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typedef struct {
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// cipher_context_t for the cipher-operations
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cipher_context_t cc;
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#if defined(AES) || defined (TWOFISH)
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// supports 16-Byte blocksize
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uint8_t context[20];
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#else
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// supports 8-Byte blocksize
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uint8_t context[12];
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#endif
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} cipher_mac_context_t;
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#ifdef __cplusplus
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}
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#endif
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/** @} */
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#endif /* __CIPHERS_H_ */
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