#include <stdio.h>
#include <stdlib.h>



//operazioni sui bits
#define bit_get(p,m) ((p) & (m))
#define bit_set(p,m) ((p) |= (m))
#define bit_clear(p,m) ((p) &= ~(m))
#define bit_flip(p,m) ((p) ^= (m))
#define bit_write(c,p,m) (c ? bit_set(p,m) : bit_clear(p,m))
#define BIT(x) (0x01 << (x))
#define LONGBIT(x) ((unsigned long)0x00000001 << (x))

int main( int argc, char **argv )
{
	unsigned int v1,v0,a0,a1,a3,t0;
	unsigned int bitmask = 0xF;
	unsigned int mac[6];


	if( argc != 3 )
	{
		fprintf( stderr, "\nUsage: %s <SSID> <MAC>\n\n" , argv[0] );
		exit( -1 );
	}

	printf( ":: SSID: %s \n" , argv[1] );
	printf( ":: MAC: %s  \n" , argv[2] );

	printf( "Computing WPA key...\n" );

	sscanf( argv[2], "%x:%x:%x:%x:%x:%x", mac, mac+1, mac+2, mac+3, mac+4, mac+5 );

	printf( ":: Splitting MAC: 0x%x : 0x%x : 0x%x : 0x%x : 0x%x : 0x%x  \n" , mac[0], mac[1],mac[2],mac[3],mac[4],mac[5] );


	v1 = mac[2];
	v0 = mac[3];
	a0 = mac[4];
	v1 = (mac[2] & bitmask);
	a1 = mac[5];
	v0 = v0 << 16;
	v1 = v1 << 24;
	bit_set(v1,v0);
	a0 = a0 << 8;
	bit_set(v1,a0);
	bit_set(v1,a1);

	printf("Valore di v1: \t %x\n", v1);


	v0 = 0x55E63B89;
	v0 = (v1*v0);
	v0 = v0 >> 57;

	t0 = v0 * 0x5f5e100;
	a3 = v1 - t0;

	printf("valore di a3: \t %x\n", a3);

	return 0;

}