aes_lib.h

最近实验的一个AES加密算法

/*C*****************************************************************************
* NAME:         AES_Lib.c
*-------------------------------------------------------------------------------
* Copyright (c) 北京迈特安技术发展有限公司.
*-------------------------------------------------------------------------------
* RELEASE:      梁锋 [e-mail]
* REVISION:     V1.0版
*-------------------------------------------------------------------------------
* PURPOSE:
* AES(Advanced Encryption Standard)加密算法
*
* NOTES:        仅支持128位加密标准
*******************************************************************************/

#ifndef AES_LIB_H
#define AES_LIB_H

/*_____ I N C L U D E S ______________________________________________________*/

#include <string.h>


/*_____ M A C R O S __________________________________________________________*/

//定义可移植的数据类型
typedef unsigned char AES_U8;
typedef unsigned int  AES_U16;

//存储在Flash中的存储类型定义(没有必要则用空格代替)
#define CODE_MEM_TYP  code

// AES only supports Nb=4
#define Nb (4)          // number of columns in the state & expanded key

#define Nr (10)         // number of rounds in encryption


/*_____ D E F I N I T I O N __________________________________________________*/

/*_____ D E C L A R A T I O N ________________________________________________*/

void AES_ExpandKey(AES_U8 *key, AES_U8 *expKey);
void AES_Encrypt(AES_U8 *in, AES_U8 *expKey, AES_U8 *out);
void AES_Decrypt(AES_U8 *in, AES_U8 *expKey, AES_U8 *out);


/******************************************************************************
                                Example
#include <stdio.h>
#include "AES_Lib.h"

AES_U8 in[16]  = {0x00,0x11,0x22,0x33,0x44,0x55,0x66,0x77,
                  0x88,0x99,0xaa,0xbb,0xcc,0xdd,0xee,0xff};

AES_U8 key[16] = {0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,
                  0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f};
AES_U8 out[16];

void main (void)
{
AES_U8  expKey[4 * Nb * (Nr + 1)];
AES_U16 idx;

    AES_ExpandKey (key, expKey);        //
    
    AES_Encrypt (in, expKey, out);

    for (idx=0; idx<16; idx++)
    {
        printf ("%.2x ", out[idx]);
    }
    printf ("\n");

    AES_Decrypt (out, expkey, in);
    
    for (idx=0; idx<16; idx++)
    {
        printf ("%.2x ", in[idx]);
    }
    printf ("\n");
}
******************************************************************************/

#endif /*AES_LIB_H*/