/* Outputs H(CID) and H(T|H(CID)) for time permits. If no time permits set HID=HTID */
public static void SERVER_1(int date, sbyte[] CID, sbyte[] HID, sbyte[] HTID)
{
sbyte[] h = hashit(0, CID);
ECP R, P = mapit(h);
if (date != 0)
{
if (HID != null)
{
P.toBytes(HID);
}
h = hashit(date, h);
R = mapit(h);
P.add(R);
P.toBytes(HTID);
}
else
{
P.toBytes(HID);
}
}
/* R=R1+R2 in group G1 */
public static int RECOMBINE_G1(sbyte[] R1, sbyte[] R2, sbyte[] R)
{
ECP P = ECP.fromBytes(R1);
ECP Q = ECP.fromBytes(R2);
if (P.is_infinity() || Q.is_infinity())
{
return(INVALID_POINT);
}
P.add(Q);
P.toBytes(R);
return(0);
}
/* Extract PIN from TOKEN for identity CID */
public static int EXTRACT_PIN(sbyte[] CID, int pin, sbyte[] TOKEN)
{
ECP P = ECP.fromBytes(TOKEN);
if (P.is_infinity())
{
return(INVALID_POINT);
}
sbyte[] h = hashit(0, CID);
ECP R = mapit(h);
pin %= MAXPIN;
R = R.pinmul(pin, PBLEN);
P.sub(R);
P.toBytes(TOKEN);
return(0);
}