aes.h

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/*
 * SPDX-FileCopyrightText: 2013 Freie Universität Berlin, Computer Systems & Telematics
 * SPDX-License-Identifier: LGPL-2.1-only
 */
 
#pragma once

 
#include <stdint.h>
 
#include "compiler_hints.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;

ACCESS(read_only, 2, 3)
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