diff options
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecT409Field.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecT409Field.cs | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecT409Field.cs b/crypto/src/math/ec/custom/sec/SecT409Field.cs index 7cb9d4529..2e5609542 100644 --- a/crypto/src/math/ec/custom/sec/SecT409Field.cs +++ b/crypto/src/math/ec/custom/sec/SecT409Field.cs @@ -40,11 +40,37 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec z[6] = x[6]; } + private static void AddTo(ulong[] x, ulong[] z) + { + z[0] ^= x[0]; + z[1] ^= x[1]; + z[2] ^= x[2]; + z[3] ^= x[3]; + z[4] ^= x[4]; + z[5] ^= x[5]; + z[6] ^= x[6]; + } + public static ulong[] FromBigInteger(BigInteger x) { return Nat.FromBigInteger64(409, x); } + public static void HalfTrace(ulong[] x, ulong[] z) + { + ulong[] tt = Nat.Create64(13); + + Nat448.Copy64(x, z); + for (int i = 1; i < 409; 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 (Nat448.IsZero64(x)) |