c语言加密解密字母程序,TEA加密解密C语言源码

#include

#include

#include

/*******************

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;

}