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| author | Peter Dettman <peter.dettman@bouncycastle.org> | 2015-12-28 14:59:52 +0700 |
|---|---|---|
| committer | Peter Dettman <peter.dettman@bouncycastle.org> | 2015-12-28 14:59:52 +0700 |
| commit | 125e93ac90fab535316f55695f14dde8e9c76c97 (patch) | |
| tree | 2dff432202163117d5012448b977c87c6f44a218 /crypto/src/math/ec/custom/sec/SecT113Field.cs | |
| parent | XML doc for TlsClient.ClientHelloRecordLayerVersion (diff) | |
| download | BouncyCastle.NET-ed25519-125e93ac90fab535316f55695f14dde8e9c76c97.tar.xz | |
Optimized Sqrt and Trace for custom binary curves
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecT113Field.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecT113Field.cs | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecT113Field.cs b/crypto/src/math/ec/custom/sec/SecT113Field.cs index 640c6e787..49773b66d 100644 --- a/crypto/src/math/ec/custom/sec/SecT113Field.cs +++ b/crypto/src/math/ec/custom/sec/SecT113Field.cs @@ -102,6 +102,16 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec z[zOff + 1] = z1 & M49; } + public static void Sqrt(ulong[] x, ulong[] z) + { + ulong u0 = Interleave.Unshuffle(x[0]), u1 = Interleave.Unshuffle(x[1]); + ulong e0 = (u0 & 0x00000000FFFFFFFFUL) | (u1 << 32); + ulong c0 = (u0 >> 32) | (u1 & 0xFFFFFFFF00000000UL); + + z[0] = e0 ^ (c0 << 57) ^ (c0 << 5); + z[1] = (c0 >> 7) ^ (c0 >> 59); + } + public static void Square(ulong[] x, ulong[] z) { ulong[] tt = Nat128.CreateExt64(); @@ -131,6 +141,12 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec } } + public static uint Trace(ulong[] x) + { + // Non-zero-trace bits: 0 + return (uint)(x[0]) & 1U; + } + protected static void ImplMultiply(ulong[] x, ulong[] y, ulong[] zz) { /* |