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| author | Peter Dettman <peter.dettman@bouncycastle.org> | 2015-08-14 18:39:29 +0700 |
|---|---|---|
| committer | Peter Dettman <peter.dettman@bouncycastle.org> | 2015-08-14 18:39:29 +0700 |
| commit | 56f23bcdee9c54b6fa3222a759d8df3780e8ac68 (patch) | |
| tree | e5fca176186ea692606506d78da2d57462abe43c /crypto/src/math/ec/custom/sec/SecT131Field.cs | |
| parent | Add locking to lazy factory property (diff) | |
| parent | Refactor NextPacketTag() (diff) | |
| download | BouncyCastle.NET-ed25519-56f23bcdee9c54b6fa3222a759d8df3780e8ac68.tar.xz | |
Merge branch 'master' of git.bouncycastle.org:bc-csharp
Conflicts: crypto/src/asn1/x9/X9ECParametersHolder.cs
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecT131Field.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecT131Field.cs | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecT131Field.cs b/crypto/src/math/ec/custom/sec/SecT131Field.cs index df75dfcd7..47f97078c 100644 --- a/crypto/src/math/ec/custom/sec/SecT131Field.cs +++ b/crypto/src/math/ec/custom/sec/SecT131Field.cs @@ -40,6 +40,35 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec return z; } + public static void Invert(ulong[] x, ulong[] z) + { + if (Nat192.IsZero64(x)) + throw new InvalidOperationException(); + + // Itoh-Tsujii inversion + + ulong[] t0 = Nat192.Create64(); + ulong[] t1 = Nat192.Create64(); + + Square(x, t0); + Multiply(t0, x, t0); + SquareN(t0, 2, t1); + Multiply(t1, t0, t1); + SquareN(t1, 4, t0); + Multiply(t0, t1, t0); + SquareN(t0, 8, t1); + Multiply(t1, t0, t1); + SquareN(t1, 16, t0); + Multiply(t0, t1, t0); + SquareN(t0, 32, t1); + Multiply(t1, t0, t1); + Square(t1, t1); + Multiply(t1, x, t1); + SquareN(t1, 65, t0); + Multiply(t0, t1, t0); + Square(t0, z); + } + public static void Multiply(ulong[] x, ulong[] y, ulong[] z) { ulong[] tt = Nat192.CreateExt64(); @@ -231,7 +260,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec Debug.Assert(y >> 45 == 0); ulong[] u = new ulong[8]; - // u[0] = 0; + //u[0] = 0; u[1] = y; u[2] = u[1] << 1; u[3] = u[2] ^ y; @@ -247,7 +276,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec int k = 33; do { - j = (uint)(x >> k); + j = (uint)(x >> k); g = u[j & 7] ^ u[(j >> 3) & 7] << 3 ^ u[(j >> 6) & 7] << 6 |