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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/SecP521R1Point.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/SecP521R1Point.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecP521R1Point.cs | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecP521R1Point.cs b/crypto/src/math/ec/custom/sec/SecP521R1Point.cs index 5da71f078..2e3a7eccb 100644 --- a/crypto/src/math/ec/custom/sec/SecP521R1Point.cs +++ b/crypto/src/math/ec/custom/sec/SecP521R1Point.cs @@ -216,12 +216,11 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec uint[] S = Y1Squared; SecP521R1Field.Multiply(Y1Squared, X1.x, S); - SecP521R1Field.Twice(S, S); - SecP521R1Field.Twice(S, S); + Nat.ShiftUpBits(17, S, 2, 0); + SecP521R1Field.Reduce23(S); - SecP521R1Field.Twice(T, t1); - SecP521R1Field.Twice(t1, t1); - SecP521R1Field.Twice(t1, t1); + Nat.ShiftUpBits(17, T, 3, 0, t1); + SecP521R1Field.Reduce23(t1); SecP521R1FieldElement X3 = new SecP521R1FieldElement(T); SecP521R1Field.Square(M, X3.x); |