aes.h

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/****************************************************************************/
//    TinyAES Striped for our specific needs                                //
//    Origin: https://github.com/kokke/tiny-AES-c                           //
//                                                                          //
//    This file is part of FF7tk                                            //
//                                                                          //
//    FF7tk is free software: you can redistribute it and/or modify         //
//    it under the terms of the GNU General Public License as published by  //
//    the Free Software Foundation, either version 3 of the License, or     //
//    (at your option) any later version.                                   //
//                                                                          //
//    FF7tk is distributed in the hope that it will be useful,              //
//    but WITHOUT ANY WARRANTY; without even the implied warranty of        //
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
//    GNU General Public License for more details.                          //
/****************************************************************************/
#ifndef _AES_H_
#define _AES_H_
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stdint.h>
 
#define AES_BLOCKLEN 16 //Block length in bytes AES is 128b block only
#define AES_KEYLEN 16   // Key length in bytes
#define AES_keyExpSize 176
 
struct AES_ctx
{
  uint8_t RoundKey[AES_keyExpSize];
  uint8_t Iv[AES_BLOCKLEN];
};
 
void AES_init_ctx_iv(struct AES_ctx* ctx, const uint8_t* key, const uint8_t* iv);
void XorWithIv(uint8_t* buf, const uint8_t* Iv);
void XorWithByte(uint8_t* buf, uint8_t byte, int length);
 
// buffer size is exactly AES_BLOCKLEN bytes; 
// you need only AES_init_ctx as IV is not used in ECB 
// NB: ECB is considered insecure for most uses
void AES_ECB_encrypt(const struct AES_ctx* ctx, uint8_t* buf);
void AES_ECB_decrypt(const struct AES_ctx* ctx, uint8_t* buf);
 
#ifdef __cplusplus
}
#endif
#endif //_AES_H_