Port of latest Curve25519 stuff from Java build

1 files changed, 0 insertions, 210 deletions

diff --git a/crypto/src/math/ec/custom/sec/Curve25519Field.cs b/crypto/src/math/ec/custom/sec/Curve25519Field.cs
deleted file mode 100644
index ee0f88311..000000000
--- a/crypto/src/math/ec/custom/sec/Curve25519Field.cs
+++ /dev/null
@@ -1,210 +0,0 @@
-using System;
-using System.Diagnostics;
-
-namespace Org.BouncyCastle.Math.EC.Custom.Sec
-{
-    internal class Curve25519Field
-    {
-        // 2^255 - 2^4 - 2^1 - 1
-        internal static readonly uint[] P = new uint[]{ 0xFFFFFFED, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
-            0xFFFFFFFF, 0x7FFFFFFF };
-        private const int P7 = 0x7FFFFFFF;
-        private static readonly uint[] PExt = new uint[]{ 0x00000169, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
-            0x00000000, 0x00000000, 0x00000000, 0xFFFFFFED, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
-            0xFFFFFFFF, 0x3FFFFFFF };
-        private const uint PInv = 0x13;
-
-        public static void Add(uint[] x, uint[] y, uint[] z)
-        {
-            Nat256.Add(x, y, z);
-            if (Nat256.Gte(z, P))
-            {
-                AddPInvTo(z);
-            }
-        }
-
-        public static void AddExt(uint[] xx, uint[] yy, uint[] zz)
-        {
-            Nat.Add(16, xx, yy, zz);
-            if (Nat.Gte(16, zz, PExt))
-            {
-                SubPExtFrom(zz);
-            }
-        }
-
-        public static void AddOne(uint[] x, uint[] z)
-        {
-            Nat.Inc(8, x, z);
-            if (Nat256.Gte(z, P))
-            {
-                AddPInvTo(z);
-            }
-        }
-
-        public static uint[] FromBigInteger(BigInteger x)
-        {
-            uint[] z = Nat256.FromBigInteger(x);
-            while (Nat256.Gte(z, P))
-            {
-                Nat256.SubFrom(P, z);
-            }
-            return z;
-        }
-
-        public static void Half(uint[] x, uint[] z)
-        {
-            if ((x[0] & 1) == 0)
-            {
-                Nat.ShiftDownBit(8, x, 0, z);
-            }
-            else
-            {
-                Nat256.Add(x, P, z);
-                Nat.ShiftDownBit(8, z, 0);
-            }
-        }
-
-        public static void Multiply(uint[] x, uint[] y, uint[] z)
-        {
-            uint[] tt = Nat256.CreateExt();
-            Nat256.Mul(x, y, tt);
-            Reduce(tt, z);
-        }
-
-        public static void Negate(uint[] x, uint[] z)
-        {
-            if (Nat256.IsZero(x))
-            {
-                Nat256.Zero(z);
-            }
-            else
-            {
-                Nat256.Sub(P, x, z);
-            }
-        }
-
-        public static void Reduce(uint[] xx, uint[] z)
-        {
-            Debug.Assert(xx[15] >> 30 == 0);
-
-            uint xx07 = xx[7];
-            Nat.ShiftUpBit(8, xx, 8, xx07, z, 0);
-            uint c = Nat256.MulByWordAddTo(PInv, xx, z) << 1;
-            uint z07 = z[7];
-            z[7] = z07 & P7;
-            c += (z07 >> 31) - (xx07 >> 31);
-            Nat.AddWordTo(8, c * PInv, z);
-            if (Nat256.Gte(z, P))
-            {
-                AddPInvTo(z);
-            }
-        }
-
-        public static void Square(uint[] x, uint[] z)
-        {
-            uint[] tt = Nat256.CreateExt();
-            Nat256.Square(x, tt);
-            Reduce(tt, z);
-        }
-
-        public static void SquareN(uint[] x, int n, uint[] z)
-        {
-    //        assert n > 0;
-
-            uint[] tt = Nat256.CreateExt();
-            Nat256.Square(x, tt);
-            Reduce(tt, z);
-
-            while (--n > 0)
-            {
-                Nat256.Square(z, tt);
-                Reduce(tt, z);
-            }
-        }
-
-        public static void Subtract(uint[] x, uint[] y, uint[] z)
-        {
-            int c = Nat256.Sub(x, y, z);
-            if (c != 0)
-            {
-                SubPInvFrom(z);
-            }
-        }
-
-        public static void SubtractExt(uint[] xx, uint[] yy, uint[] zz)
-        {
-            int c = Nat.Sub(16, xx, yy, zz);
-            if (c != 0)
-            {
-                AddPExtTo(zz);
-            }
-        }
-
-        public static void Twice(uint[] x, uint[] z)
-        {
-            Nat.ShiftUpBit(8, x, 0, z);
-            if (Nat256.Gte(z, P))
-            {
-                AddPInvTo(z);
-            }
-        }
-
-        private static void AddPExtTo(uint[] zz)
-        {
-            ulong c = (ulong)zz[0] + PExt[0];
-            zz[0] = (uint)c;
-            c >>= 32;
-
-            int i = 1 - (int)c;
-            i = (i << 3) - i;
-
-            while (++i < 16)
-            {
-                c += (ulong)zz[i] + PExt[i];
-                zz[i] = (uint)c;
-                c >>= 32;
-            }
-        }
-
-        private static void SubPExtFrom(uint[] zz)
-        {
-            long c = (long)zz[0] - PExt[0];
-            zz[0] = (uint)c;
-            c >>= 32;
-
-            int i = 1 + (int)c;
-            i = (i << 3) - i;
-
-            while (++i < 16)
-            {
-                c += (long)zz[i] - PExt[i];
-                zz[i] = (uint)c;
-                c >>= 32;
-            }
-        }
-
-        private static void AddPInvTo(uint[] z)
-        {
-            ulong c = (ulong)z[0] + PInv;
-            z[0] = (uint)c;
-            c >>= 32;
-            if (c != 0)
-            {
-                Nat.IncAt(7, z, 1);
-            }
-            z[7] &= P7;
-        }
-
-        private static void SubPInvFrom(uint[] z)
-        {
-            long c = (long)z[0] - PInv;
-            z[0] = (uint)c;
-            c >>= 32;
-            if (c != 0)
-            {
-                Nat.DecAt(7, z, 1);
-            }
-            z[7] &= P7;
-        }
-    }
-}