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- #if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
- using System;
- using System.Diagnostics;
- using Org.BouncyCastle.Math.Raw;
- namespace Org.BouncyCastle.Math.EC.Custom.Sec
- {
- internal class SecP128R1Field
- {
-
- internal static readonly uint[] P = new uint[] { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFD };
- internal static readonly uint[] PExt = new uint[] { 0x00000001, 0x00000000, 0x00000000, 0x00000004, 0xFFFFFFFE,
- 0xFFFFFFFF, 0x00000003, 0xFFFFFFFC };
- private static readonly uint[] PExtInv = new uint[]{ 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFB,
- 0x00000001, 0x00000000, 0xFFFFFFFC, 0x00000003 };
- private const uint P3 = 0xFFFFFFFD;
- private const uint PExt7 = 0xFFFFFFFC;
- public static void Add(uint[] x, uint[] y, uint[] z)
- {
- uint c = Nat128.Add(x, y, z);
- if (c != 0 || (z[3] == P3 && Nat128.Gte(z, P)))
- {
- AddPInvTo(z);
- }
- }
- public static void AddExt(uint[] xx, uint[] yy, uint[] zz)
- {
- uint c = Nat256.Add(xx, yy, zz);
- if (c != 0 || (zz[7] == PExt7 && Nat256.Gte(zz, PExt)))
- {
- Nat.AddTo(PExtInv.Length, PExtInv, zz);
- }
- }
- public static void AddOne(uint[] x, uint[] z)
- {
- uint c = Nat.Inc(4, x, z);
- if (c != 0 || (z[3] == P3 && Nat128.Gte(z, P)))
- {
- AddPInvTo(z);
- }
- }
- public static uint[] FromBigInteger(BigInteger x)
- {
- uint[] z = Nat128.FromBigInteger(x);
- if (z[3] == P3 && Nat128.Gte(z, P))
- {
- Nat128.SubFrom(P, z);
- }
- return z;
- }
- public static void Half(uint[] x, uint[] z)
- {
- if ((x[0] & 1) == 0)
- {
- Nat.ShiftDownBit(4, x, 0, z);
- }
- else
- {
- uint c = Nat128.Add(x, P, z);
- Nat.ShiftDownBit(4, z, c);
- }
- }
- public static void Multiply(uint[] x, uint[] y, uint[] z)
- {
- uint[] tt = Nat128.CreateExt();
- Nat128.Mul(x, y, tt);
- Reduce(tt, z);
- }
- public static void MultiplyAddToExt(uint[] x, uint[] y, uint[] zz)
- {
- uint c = Nat128.MulAddTo(x, y, zz);
- if (c != 0 || (zz[7] == PExt7 && Nat256.Gte(zz, PExt)))
- {
- Nat.AddTo(PExtInv.Length, PExtInv, zz);
- }
- }
- public static void Negate(uint[] x, uint[] z)
- {
- if (Nat128.IsZero(x))
- {
- Nat128.Zero(z);
- }
- else
- {
- Nat128.Sub(P, x, z);
- }
- }
- public static void Reduce(uint[] xx, uint[] z)
- {
- ulong x0 = xx[0], x1 = xx[1], x2 = xx[2], x3 = xx[3];
- ulong x4 = xx[4], x5 = xx[5], x6 = xx[6], x7 = xx[7];
- x3 += x7; x6 += (x7 << 1);
- x2 += x6; x5 += (x6 << 1);
- x1 += x5; x4 += (x5 << 1);
- x0 += x4; x3 += (x4 << 1);
- z[0] = (uint)x0; x1 += (x0 >> 32);
- z[1] = (uint)x1; x2 += (x1 >> 32);
- z[2] = (uint)x2; x3 += (x2 >> 32);
- z[3] = (uint)x3;
- Reduce32((uint)(x3 >> 32), z);
- }
- public static void Reduce32(uint x, uint[] z)
- {
- while (x != 0)
- {
- ulong c, x4 = x;
-
- c = (ulong)z[0] + x4;
- z[0] = (uint)c; c >>= 32;
- if (c != 0)
- {
- c += (ulong)z[1];
- z[1] = (uint)c; c >>= 32;
- c += (ulong)z[2];
- z[2] = (uint)c; c >>= 32;
- }
- c += (ulong)z[3] + (x4 << 1);
- z[3] = (uint)c; c >>= 32;
- Debug.Assert(c >= 0 && c <= 2);
- x = (uint)c;
- }
- }
- public static void Square(uint[] x, uint[] z)
- {
- uint[] tt = Nat128.CreateExt();
- Nat128.Square(x, tt);
- Reduce(tt, z);
- }
- public static void SquareN(uint[] x, int n, uint[] z)
- {
- Debug.Assert(n > 0);
- uint[] tt = Nat128.CreateExt();
- Nat128.Square(x, tt);
- Reduce(tt, z);
- while (--n > 0)
- {
- Nat128.Square(z, tt);
- Reduce(tt, z);
- }
- }
- public static void Subtract(uint[] x, uint[] y, uint[] z)
- {
- int c = Nat128.Sub(x, y, z);
- if (c != 0)
- {
- SubPInvFrom(z);
- }
- }
- public static void SubtractExt(uint[] xx, uint[] yy, uint[] zz)
- {
- int c = Nat.Sub(10, xx, yy, zz);
- if (c != 0)
- {
- Nat.SubFrom(PExtInv.Length, PExtInv, zz);
- }
- }
- public static void Twice(uint[] x, uint[] z)
- {
- uint c = Nat.ShiftUpBit(4, x, 0, z);
- if (c != 0 || (z[3] == P3 && Nat128.Gte(z, P)))
- {
- AddPInvTo(z);
- }
- }
- private static void AddPInvTo(uint[] z)
- {
- long c = (long)z[0] + 1;
- z[0] = (uint)c; c >>= 32;
- if (c != 0)
- {
- c += (long)z[1];
- z[1] = (uint)c; c >>= 32;
- c += (long)z[2];
- z[2] = (uint)c; c >>= 32;
- }
- c += (long)z[3] + 2;
- z[3] = (uint)c;
- }
- private static void SubPInvFrom(uint[] z)
- {
- long c = (long)z[0] - 1;
- z[0] = (uint)c; c >>= 32;
- if (c != 0)
- {
- c += (long)z[1];
- z[1] = (uint)c; c >>= 32;
- c += (long)z[2];
- z[2] = (uint)c; c >>= 32;
- }
- c += (long)z[3] - 2;
- z[3] = (uint)c;
- }
- }
- }
- #endif
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