diff options
| -rw-r--r-- | crypto/src/math/raw/Nat448.cs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/crypto/src/math/raw/Nat448.cs b/crypto/src/math/raw/Nat448.cs index 8c7f3244d..898e33199 100644 --- a/crypto/src/math/raw/Nat448.cs +++ b/crypto/src/math/raw/Nat448.cs @@ -79,6 +79,44 @@ namespace Org.BouncyCastle.Math.Raw return true; } + public static void Mul(uint[] x, uint[] y, uint[] zz) + { + Nat224.Mul(x, y, zz); + Nat224.Mul(x, 7, y, 7, zz, 14); + + uint c21 = Nat224.AddToEachOther(zz, 7, zz, 14); + uint c14 = c21 + Nat224.AddTo(zz, 0, zz, 7, 0); + c21 += Nat224.AddTo(zz, 21, zz, 14, c14); + + uint[] dx = Nat224.Create(), dy = Nat224.Create(); + bool neg = Nat224.Diff(x, 7, x, 0, dx, 0) != Nat224.Diff(y, 7, y, 0, dy, 0); + + uint[] tt = Nat224.CreateExt(); + Nat224.Mul(dx, dy, tt); + + c21 += neg ? Nat.AddTo(14, tt, 0, zz, 7) : (uint)Nat.SubFrom(14, tt, 0, zz, 7); + Nat.AddWordAt(28, c21, zz, 21); + } + + public static void Square(uint[] x, uint[] zz) + { + Nat224.Square(x, zz); + Nat224.Square(x, 7, zz, 14); + + uint c21 = Nat224.AddToEachOther(zz, 7, zz, 14); + uint c14 = c21 + Nat224.AddTo(zz, 0, zz, 7, 0); + c21 += Nat224.AddTo(zz, 21, zz, 14, c14); + + uint[] dx = Nat224.Create(); + Nat224.Diff(x, 7, x, 0, dx, 0); + + uint[] tt = Nat224.CreateExt(); + Nat224.Square(dx, tt); + + c21 += (uint)Nat.SubFrom(14, tt, 0, zz, 7); + Nat.AddWordAt(28, c21, zz, 21); + } + public static BigInteger ToBigInteger64(ulong[] x) { byte[] bs = new byte[56]; |