1 package org.bouncycastle.math.raw; 2 3 4 public abstract class Nat512 5 { mul(int[] x, int[] y, int[] zz)6 public static void mul(int[] x, int[] y, int[] zz) 7 { 8 Nat256.mul(x, y, zz); 9 Nat256.mul(x, 8, y, 8, zz, 16); 10 11 int c24 = Nat256.addToEachOther(zz, 8, zz, 16); 12 int c16 = c24 + Nat256.addTo(zz, 0, zz, 8, 0); 13 c24 += Nat256.addTo(zz, 24, zz, 16, c16); 14 15 int[] dx = Nat256.create(), dy = Nat256.create(); 16 boolean neg = Nat256.diff(x, 8, x, 0, dx, 0) != Nat256.diff(y, 8, y, 0, dy, 0); 17 18 int[] tt = Nat256.createExt(); 19 Nat256.mul(dx, dy, tt); 20 21 c24 += neg ? Nat.addTo(16, tt, 0, zz, 8) : Nat.subFrom(16, tt, 0, zz, 8); 22 Nat.addWordAt(32, c24, zz, 24); 23 } 24 square(int[] x, int[] zz)25 public static void square(int[] x, int[] zz) 26 { 27 Nat256.square(x, zz); 28 Nat256.square(x, 8, zz, 16); 29 30 int c24 = Nat256.addToEachOther(zz, 8, zz, 16); 31 int c16 = c24 + Nat256.addTo(zz, 0, zz, 8, 0); 32 c24 += Nat256.addTo(zz, 24, zz, 16, c16); 33 34 int[] dx = Nat256.create(); 35 Nat256.diff(x, 8, x, 0, dx, 0); 36 37 int[] tt = Nat256.createExt(); 38 Nat256.square(dx, tt); 39 40 c24 += Nat.subFrom(16, tt, 0, zz, 8); 41 Nat.addWordAt(32, c24, zz, 24); 42 } 43 } 44