/* multiply by 2 in the galois field 
galois_mul2 */
UINT8 galois_mul2(UINT8 value)
/* multiply by 2 in the galois field 
galois_mul2 */
UINT8 galois_mul2(UINT8 value)
{
	if (value>>7)
	{
		value = value << 1;
		return (value^0x1b);
	} else
		return value<<1;
}