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| author | Peter Dettman <peter.dettman@bouncycastle.org> | 2014-03-05 11:53:21 +0700 |
|---|---|---|
| committer | Peter Dettman <peter.dettman@bouncycastle.org> | 2014-03-05 11:53:21 +0700 |
| commit | 7e777150e04e7e74dbf28f8e0a922bd2a5f8d94a (patch) | |
| tree | a9ce36cb2d6a01be55b4876492bab81c8ca75463 /crypto/src/math/ec/custom/sec/SecP256R1Field.cs | |
| parent | Fix infinite loop issue when there is no sqrt (diff) | |
| download | BouncyCastle.NET-ed25519-7e777150e04e7e74dbf28f8e0a922bd2a5f8d94a.tar.xz | |
Use Nat methods instead of specific Nat*.*Ext methods
Reduction improvements in curve25519 and secp256r1
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecP256R1Field.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecP256R1Field.cs | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecP256R1Field.cs b/crypto/src/math/ec/custom/sec/SecP256R1Field.cs index de383046d..cd4702f16 100644 --- a/crypto/src/math/ec/custom/sec/SecP256R1Field.cs +++ b/crypto/src/math/ec/custom/sec/SecP256R1Field.cs @@ -14,6 +14,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec private static readonly uint[] _2P = new uint[]{ 0xFFFFFFFE, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000001, 0x00000000, 0x00000000, 0x00000002, 0xFFFFFFFE, 0x00000001 }; private const uint P7 = 0xFFFFFFFF; + private const uint PExt15 = 0xFFFFFFFE; public static void Add(uint[] x, uint[] y, uint[] z) { @@ -27,7 +28,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec public static void AddExt(uint[] xx, uint[] yy, uint[] zz) { uint c = Nat.Add(16, xx, yy, zz); - if (c != 0 || Nat256.GteExt(zz, PExt)) + if (c != 0 || (zz[15] >= PExt15 && Nat.Gte(16, zz, PExt))) { Nat.SubFrom(16, PExt, zz); } |