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include

voidLFSR(unsigned char pzt[],unsigned char pjg[],int n)

{

unsigned char t=0;

int c=0,i;

for(i=0;i

t^=(pzt[i]&pjg[i]);

t^=((t<<1)^(t<<2)^(t<<3)^(t<<4)^(t<<5)^(t<<6)^(t<<7));

if (t&0x80) c=1;

for(i=n-1;i>=0;i--)

{

t=pzt[i];

pzt[i]=((t<<1)|c)&0xff;

c=(t&0x80)?1:0;

}

}

voidprint_2(int val2)

{

unsigned char *p = (unsignedchar*)&val2 + 3;

for(int k = 0; k <= 3; k++)

{

int val2 = *(p-k);

for (int i = 7; i >= 0; i--)

{

if(val2 & (1 <

printf("1");

else

printf("0");

}

printf(" ");

}

}

voidDSR(unsigned char pzt[],unsigned char pjg[],int n)

{

unsigned char t;

int c=0,i;

for(i=n-1;i>=0;i--)

{

t=pzt[i];

pzt[i]=((t<<1)|c)&0xff;

c=(t&0x80)?1:0;

}

if(c)

for(i=0;i

pzt[i]^=pjg[i];

}