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| author | Peter Dettman <peter.dettman@bouncycastle.org> | 2014-02-02 14:49:51 +0700 |
|---|---|---|
| committer | Peter Dettman <peter.dettman@bouncycastle.org> | 2014-02-02 14:49:51 +0700 |
| commit | 17397bac85c830365ee6968fb09373165c6f1dc1 (patch) | |
| tree | c08e97d99d6be525d19ade2ecb4b098773fe4aa9 /crypto/src/math/ec/custom/sec/SecP521R1Field.cs | |
| parent | Bring OCB test vectors up-to-date with draft v06 (diff) | |
| download | BouncyCastle.NET-ed25519-17397bac85c830365ee6968fb09373165c6f1dc1.tar.xz | |
Minor optimization for secp521r1 point doubling
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecP521R1Field.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecP521R1Field.cs | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecP521R1Field.cs b/crypto/src/math/ec/custom/sec/SecP521R1Field.cs index 43f012b8b..f39a0daa6 100644 --- a/crypto/src/math/ec/custom/sec/SecP521R1Field.cs +++ b/crypto/src/math/ec/custom/sec/SecP521R1Field.cs @@ -85,6 +85,18 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec z[16] = c; } + public static void Reduce23(uint[] z) + { + uint z16 = z[16]; + uint c = Nat.AddWord(16, z16 >> 9, z) + (z16 & P16); + if (c > P16 || (c == P16 && Nat.Eq(16, z, P))) + { + c += Nat.Inc(16, z, 0); + c &= P16; + } + z[16] = c; + } + public static void Square(uint[] x, uint[] z) { uint[] tt = Nat.Create(34); |