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| author | Peter Dettman <peter.dettman@bouncycastle.org> | 2014-02-28 15:59:14 +0700 |
|---|---|---|
| committer | Peter Dettman <peter.dettman@bouncycastle.org> | 2014-02-28 15:59:14 +0700 |
| commit | 55af772372bbf933cf54519d99647cbe7aa362f0 (patch) | |
| tree | 3ea8b61b8089a2ad20df451c3840ac1bc3e4d2bb /crypto/src | |
| parent | Optimized Sqrt() for custom secp224r1 (diff) | |
| download | BouncyCastle.NET-ed25519-55af772372bbf933cf54519d99647cbe7aa362f0.tar.xz | |
Avoid a few negations in Sqrt()
Diffstat (limited to 'crypto/src')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecP224R1FieldElement.cs | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecP224R1FieldElement.cs b/crypto/src/math/ec/custom/sec/SecP224R1FieldElement.cs index b17bc8fcd..1f9425dd0 100644 --- a/crypto/src/math/ec/custom/sec/SecP224R1FieldElement.cs +++ b/crypto/src/math/ec/custom/sec/SecP224R1FieldElement.cs @@ -185,12 +185,11 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec return Q.GetHashCode() ^ Arrays.GetHashCode(x, 0, 7); } - private static void RM(uint[] c, uint[] d0, uint[] e0, uint[] d1, uint[] e1, uint[] f) + private static void RM(uint[] nc, uint[] d0, uint[] e0, uint[] d1, uint[] e1, uint[] f) { uint[] t = Nat224.Create(); SecP224R1Field.Multiply(e1, e0, t); - SecP224R1Field.Multiply(t, c, t); - SecP224R1Field.Negate(t, t); + SecP224R1Field.Multiply(t, nc, t); SecP224R1Field.Multiply(d1, d0, f); SecP224R1Field.Add(f, t, f); SecP224R1Field.Multiply(d1, e0, t); @@ -198,13 +197,15 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec SecP224R1Field.Multiply(e1, d0, e1); SecP224R1Field.Add(e1, t, e1); SecP224R1Field.Square(e1, f); - SecP224R1Field.Multiply(f, c, f); - SecP224R1Field.Negate(f, f); + SecP224R1Field.Multiply(f, nc, f); } private static void RP(uint[] c, uint[] d1, uint[] e1, uint[] f) { - SecP224R1Field.Negate(c, f); + uint[] nc = Nat224.Create(); + SecP224R1Field.Negate(c, nc); + + Nat224.Copy(nc, f); uint[] d0 = Nat224.Create(); uint[] e0 = Nat224.Create(); @@ -220,7 +221,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec RS(d1, e1, f); } - RM(c, d0, e0, d1, e1, f); + RM(nc, d0, e0, d1, e1, f); } } |