diff options
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecT239Field.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecT239Field.cs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecT239Field.cs b/crypto/src/math/ec/custom/sec/SecT239Field.cs index b0c033fe2..eab929359 100644 --- a/crypto/src/math/ec/custom/sec/SecT239Field.cs +++ b/crypto/src/math/ec/custom/sec/SecT239Field.cs @@ -38,11 +38,34 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec z[3] = x[3]; } + private static void AddTo(ulong[] x, ulong[] z) + { + z[0] ^= x[0]; + z[1] ^= x[1]; + z[2] ^= x[2]; + z[3] ^= x[3]; + } + public static ulong[] FromBigInteger(BigInteger x) { return Nat.FromBigInteger64(239, x); } + public static void HalfTrace(ulong[] x, ulong[] z) + { + ulong[] tt = Nat256.CreateExt64(); + + Nat256.Copy64(x, z); + for (int i = 1; i < 239; i += 2) + { + ImplSquare(z, tt); + Reduce(tt, z); + ImplSquare(z, tt); + Reduce(tt, z); + AddTo(x, z); + } + } + public static void Invert(ulong[] x, ulong[] z) { if (Nat256.IsZero64(x)) |