From 94bd14f0d17e617ca1a8b9c4b188416758820c78 Mon Sep 17 00:00:00 2001 From: Peter Dettman Date: Mon, 23 Mar 2015 19:05:36 +0700 Subject: Math.Raw support for custom binary curves - Also migrate the 'raw' stuff into Math.Raw following Java build --- crypto/src/math/raw/Nat512.cs | 46 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 crypto/src/math/raw/Nat512.cs (limited to 'crypto/src/math/raw/Nat512.cs') diff --git a/crypto/src/math/raw/Nat512.cs b/crypto/src/math/raw/Nat512.cs new file mode 100644 index 000000000..a9ef2b3b6 --- /dev/null +++ b/crypto/src/math/raw/Nat512.cs @@ -0,0 +1,46 @@ +using System; +using System.Diagnostics; + +namespace Org.BouncyCastle.Math.Raw +{ + internal abstract class Nat512 + { + public static void Mul(uint[] x, uint[] y, uint[] zz) + { + Nat256.Mul(x, y, zz); + Nat256.Mul(x, 8, y, 8, zz, 16); + + uint c24 = Nat256.AddToEachOther(zz, 8, zz, 16); + uint c16 = c24 + Nat256.AddTo(zz, 0, zz, 8, 0); + c24 += Nat256.AddTo(zz, 24, zz, 16, c16); + + uint[] dx = Nat256.Create(), dy = Nat256.Create(); + bool neg = Nat256.Diff(x, 8, x, 0, dx, 0) != Nat256.Diff(y, 8, y, 0, dy, 0); + + uint[] tt = Nat256.CreateExt(); + Nat256.Mul(dx, dy, tt); + + c24 += neg ? Nat.AddTo(16, tt, 0, zz, 8) : (uint)Nat.SubFrom(16, tt, 0, zz, 8); + Nat.AddWordAt(32, c24, zz, 24); + } + + public static void Square(uint[] x, uint[] zz) + { + Nat256.Square(x, zz); + Nat256.Square(x, 8, zz, 16); + + uint c24 = Nat256.AddToEachOther(zz, 8, zz, 16); + uint c16 = c24 + Nat256.AddTo(zz, 0, zz, 8, 0); + c24 += Nat256.AddTo(zz, 24, zz, 16, c16); + + uint[] dx = Nat256.Create(); + Nat256.Diff(x, 8, x, 0, dx, 0); + + uint[] m = Nat256.CreateExt(); + Nat256.Square(dx, m); + + c24 += (uint)Nat.SubFrom(16, m, 0, zz, 8); + Nat.AddWordAt(32, c24, zz, 24); + } + } +} -- cgit 1.4.1