TEA加密解密C语言源码

ID:410427 · 发表于 2018-10-16 17:57

加密函数:
btea_encrypt(T_buffer, TEA_key );
TX_buffer是需要发送的数据，经过该函数后，TX_buffer便是加密后的数据。

解密函数:
btea_decrpyt(RX_buffer, TEA_key);
RX_buffer是接收到的加密数据，经过该函数，RX_buffer便是解密后的数据(即实际传输数据)

BLOCK_SIZE 要和数据长度相等

单片机源程序如下:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
/*******************
TEA加密解密算法
*******************/
#define DATA_LEN 32
#define MX (z>>5^y<<2)+(y>>3^z<<4)^(sum^y)+(k[p&3^e]^z)
#define DELTA 0x9e3779b9
#define S_LOOPTIME 1 //5
#define BLOCK_SIZE DATA_LEN //PAGE_SIZE,根据你所要加密的数据包长度修改此参数(单位:字节)
unsigned char TEA_key[16]=
{
0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,
0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x10
};
//数据缓冲区
unsigned char TX_buffer[DATA_LEN];
unsigned char RX_buffer[DATA_LEN];
/*加密时使用函数, buf里面的内容就是加密后的数据，key是加密密钥*/
void btea_encrypt( unsigned char* buf, unsigned char* key )
{
unsigned char n=BLOCK_SIZE/4;
unsigned long *v=(unsigned long *)buf;
unsigned long *k=(unsigned long *)key;
unsigned long z = v[n - 1],y = v[0],sum = 0,e ;
unsigned char p,q ;
// Coding Part
q = S_LOOPTIME + 52 / n ;
while ( q-- > 0 )
{
sum += DELTA ;
e = sum >> 2 & 3 ;
for ( p = 0 ; p < n - 1 ; p++ )
y = v[p + 1],
z = v[p] += MX;
y = v[0] ;
z = v[n - 1] += MX;
}
}
/*解密时使用函数, buf里面的内容就是解密后的数据，key是解密密钥*/
void btea_decrpyt( unsigned char* buf, unsigned char* key )
{
unsigned char n=BLOCK_SIZE/4;
unsigned long *v=(unsigned long *)buf;
unsigned long *k=(unsigned long *)key;
unsigned long z = v[n - 1],y = v[0],sum = 0,e ;
unsigned char p,q ;
//Decoding Part...
q = S_LOOPTIME + 52 / n ;
sum = q * DELTA ;
while ( sum != 0 )
{
e = sum >> 2 & 3 ;
for ( p = n - 1 ; p > 0 ; p-- )
z = v[p - 1],
y = v[p] -= MX;
z = v[n - 1] ;
y = v[0] -= MX;
sum -= DELTA ;
}
}
/************************************************************************************************************/
void CreateBUF(unsigned char *buf)
{
int i = 0;
for (i = 0;i < DATA_LEN; i++)
{
buf[i] = rand()%255;
}
}
void Trans(unsigned char *buf1, unsigned char *buf2)
{
int i = 0;
for (i = 0;i < DATA_LEN; i++)
{
buf2[i] = buf1[i];
}
}
void DIS(unsigned char sts, unsigned char*buf)
{
int i = 0;
printf("\n");
switch (sts)
{
case 0: printf("实际发送数组:"); break;
case 1: printf("加密数据数组:"); break;
case 2: printf("实际接收数组:"); break;
default: break;
}
for (i = 0;i < DATA_LEN; i++)
{
printf("%d ", buf[i]);
}
printf("\n");
}
int main(void)
{
srand((time(NULL)));
CreateBUF(TX_buffer); //生成一组随机数
DIS(0,TX_buffer); //显示实际数据
btea_encrypt(TX_buffer, TEA_key); //发送数组加密
DIS(1,TX_buffer); //显示加密后的数据
Trans(TX_buffer, RX_buffer); //模拟信道
btea_decrpyt(RX_buffer, TEA_key); //接收数组解密
DIS(2, RX_buffer); //显示接收数据
return 0;
}