public void exponentiateX(long pow, byte[] output) { long[] y = GCMUtil.oneAsLongs(); int bit = 0; while (pow > 0) { if ((pow & 1L) != 0) { ensureAvailable(bit); GCMUtil.multiply(y, (long[])lookupPowX2.elementAt(bit)); } ++bit; pow >>>= 1; } GCMUtil.asBytes(y, output); }
public void exponentiateX(long pow, byte[] output) { // Initial value is little-endian 1 long[] y = GCMUtil.oneAsLongs(); if (pow > 0) { long[] powX = Arrays.clone(x); do { if ((pow & 1L) != 0) { GCMUtil.multiply(y, powX); } GCMUtil.square(powX, powX); pow >>>= 1; } while (pow > 0); } GCMUtil.asBytes(y, output); } }