| package org.bouncycastle.math.raw; |
| |
| |
| public abstract class Nat512 |
| { |
| public static void mul(int[] x, int[] y, int[] zz) |
| { |
| Nat256.mul(x, y, zz); |
| Nat256.mul(x, 8, y, 8, zz, 16); |
| |
| int c24 = Nat256.addToEachOther(zz, 8, zz, 16); |
| int c16 = c24 + Nat256.addTo(zz, 0, zz, 8, 0); |
| c24 += Nat256.addTo(zz, 24, zz, 16, c16); |
| |
| int[] dx = Nat256.create(), dy = Nat256.create(); |
| boolean neg = Nat256.diff(x, 8, x, 0, dx, 0) != Nat256.diff(y, 8, y, 0, dy, 0); |
| |
| int[] tt = Nat256.createExt(); |
| Nat256.mul(dx, dy, tt); |
| |
| c24 += neg ? Nat.addTo(16, tt, 0, zz, 8) : Nat.subFrom(16, tt, 0, zz, 8); |
| Nat.addWordAt(32, c24, zz, 24); |
| } |
| |
| public static void square(int[] x, int[] zz) |
| { |
| Nat256.square(x, zz); |
| Nat256.square(x, 8, zz, 16); |
| |
| int c24 = Nat256.addToEachOther(zz, 8, zz, 16); |
| int c16 = c24 + Nat256.addTo(zz, 0, zz, 8, 0); |
| c24 += Nat256.addTo(zz, 24, zz, 16, c16); |
| |
| int[] dx = Nat256.create(); |
| Nat256.diff(x, 8, x, 0, dx, 0); |
| |
| int[] tt = Nat256.createExt(); |
| Nat256.square(dx, tt); |
| |
| c24 += Nat.subFrom(16, tt, 0, zz, 8); |
| Nat.addWordAt(32, c24, zz, 24); |
| } |
| } |