public static void invert(long[] x, long[] z) {
if (Nat192.isZero64(x)) {
throw new IllegalStateException();
}
// Itoh-Tsujii inversion
long[] t0 = Nat192.create64();
long[] t1 = Nat192.create64();
square(x, t0);
multiply(t0, x, t0);
squareN(t0, 2, t1);
multiply(t1, t0, t1);
squareN(t1, 4, t0);
multiply(t0, t1, t0);
squareN(t0, 8, t1);
multiply(t1, t0, t1);
squareN(t1, 16, t0);
multiply(t0, t1, t0);
squareN(t0, 32, t1);
multiply(t1, t0, t1);
square(t1, t1);
multiply(t1, x, t1);
squareN(t1, 65, t0);
multiply(t0, t1, t0);
square(t0, z);
}
public static void multiplyAddToExt(long[] x, long[] y, long[] zz) {
long[] tt = Nat192.createExt64();
implMultiply(x, y, tt);
addExt(zz, tt, zz);
}
public static void multiply(long[] x, long[] y, long[] z) {
long[] tt = Nat192.createExt64();
implMultiply(x, y, tt);
reduce(tt, z);
}
public static long[] fromBigInteger(BigInteger x) {
long[] z = Nat192.fromBigInteger64(x);
reduce61(z, 0);
return z;
}