aes.h

Go to the documentation of this file.

/*
 * Copyright (C) 2013 Freie Universität Berlin, Computer Systems & Telematics
 *
 * 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.
 */
 
#pragma once

 
#include <stdint.h>
#include "crypto/ciphers.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef uint32_t u32;
typedef uint16_t u16;
typedef uint8_t u8;
 
# define GETU32(pt) (((u32)(pt)[0] << 24) ^ ((u32)(pt)[1] << 16) ^ \
                     ((u32)(pt)[2] <<  8) ^ ((u32)(pt)[3]))
# define PUTU32(ct, st) { (ct)[0] = (u8)((st) >> 24); \
                          (ct)[1] = (u8)((st) >> 16); \
                          (ct)[2] = (u8)((st) >>  8); \
                          (ct)[3] = (u8)(st); }
 
#define AES_MAXNR         14
#define AES_BLOCK_SIZE    16

#define AES_KEY_SIZE_128    16
#define AES_KEY_SIZE_192    24
#define AES_KEY_SIZE_256    32

typedef struct {
    uint32_t context[(4 * (AES_MAXNR + 1)) + 1];
} aes_context_t;

int aes_init(cipher_context_t *context, const uint8_t *key, uint8_t keySize);

int aes_encrypt(const cipher_context_t *context, const uint8_t *plain_block,
                uint8_t *cipher_block);

int aes_decrypt(const cipher_context_t *context, const uint8_t *cipher_block,
                uint8_t *plain_block);
 
#ifdef __cplusplus
}
#endif