diff options
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecT113Field.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecT113Field.cs | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecT113Field.cs b/crypto/src/math/ec/custom/sec/SecT113Field.cs index dbb645e6f..640c6e787 100644 --- a/crypto/src/math/ec/custom/sec/SecT113Field.cs +++ b/crypto/src/math/ec/custom/sec/SecT113Field.cs @@ -37,6 +37,35 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec return z; } + public static void Invert(ulong[] x, ulong[] z) + { + if (Nat128.IsZero64(x)) + throw new InvalidOperationException(); + + // Itoh-Tsujii inversion + + ulong[] t0 = Nat128.Create64(); + ulong[] t1 = Nat128.Create64(); + + Square(x, t0); + Multiply(t0, x, t0); + Square(t0, t0); + Multiply(t0, x, t0); + SquareN(t0, 3, t1); + Multiply(t1, t0, t1); + Square(t1, t1); + Multiply(t1, x, t1); + SquareN(t1, 7, t0); + Multiply(t0, t1, t0); + SquareN(t0, 14, t1); + Multiply(t1, t0, t1); + SquareN(t1, 28, t0); + Multiply(t0, t1, t0); + SquareN(t0, 56, t1); + Multiply(t1, t0, t1); + Square(t1, z); + } + public static void Multiply(ulong[] x, ulong[] y, ulong[] z) { ulong[] tt = Nat128.CreateExt64(); |