void Rijndeal(unsigned char a[8], unsigned char b[8], unsigned char c[8]) ;
void Invrijndeal(unsigned char a[8], unsigned char b[8], unsigned char c[8]) ;

unsigned char byte2bit(unsigned char a[8], unsigned char b[8]) ;
unsigned char bit2byte(unsigned char a[8], unsigned char b[8]) ;
void keychange(unsigned char x[8], unsigned char y[16][8]) ;
void s_replace(unsigned char a[8]) ;