302 lines
8.3 KiB
C#
302 lines
8.3 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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using System;
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using System.Diagnostics;
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using Org.BouncyCastle.Math.Raw;
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namespace Org.BouncyCastle.Math.EC.Custom.Sec
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{
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internal class SecP224R1Field
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{
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// 2^224 - 2^96 + 1
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internal static readonly uint[] P = new uint[] { 0x00000001, 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
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internal static readonly uint[] PExt = new uint[]{ 0x00000001, 0x00000000, 0x00000000, 0xFFFFFFFE, 0xFFFFFFFF,
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0xFFFFFFFF, 0x00000000, 0x00000002, 0x00000000, 0x00000000, 0xFFFFFFFE, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
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private static readonly uint[] PExtInv = new uint[]{ 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000001, 0x00000000,
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0x00000000, 0xFFFFFFFF, 0xFFFFFFFD, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000001 };
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private const uint P6 = 0xFFFFFFFF;
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private const uint PExt13 = 0xFFFFFFFF;
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public static void Add(uint[] x, uint[] y, uint[] z)
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{
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uint c = Nat224.Add(x, y, z);
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if (c != 0 || (z[6] == P6 && Nat224.Gte(z, P)))
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{
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AddPInvTo(z);
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}
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}
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public static void AddExt(uint[] xx, uint[] yy, uint[] zz)
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{
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uint c = Nat.Add(14, xx, yy, zz);
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if (c != 0 || (zz[13] == PExt13 && Nat.Gte(14, zz, PExt)))
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{
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if (Nat.AddTo(PExtInv.Length, PExtInv, zz) != 0)
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{
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Nat.IncAt(14, zz, PExtInv.Length);
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}
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}
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}
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public static void AddOne(uint[] x, uint[] z)
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{
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uint c = Nat.Inc(7, x, z);
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if (c != 0 || (z[6] == P6 && Nat224.Gte(z, P)))
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{
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AddPInvTo(z);
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}
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}
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public static uint[] FromBigInteger(BigInteger x)
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{
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uint[] z = Nat224.FromBigInteger(x);
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if (z[6] == P6 && Nat224.Gte(z, P))
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{
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Nat224.SubFrom(P, z);
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}
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return z;
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}
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public static void Half(uint[] x, uint[] z)
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{
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if ((x[0] & 1) == 0)
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{
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Nat.ShiftDownBit(7, x, 0, z);
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}
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else
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{
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uint c = Nat224.Add(x, P, z);
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Nat.ShiftDownBit(7, z, c);
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}
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}
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public static void Multiply(uint[] x, uint[] y, uint[] z)
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{
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uint[] tt = Nat224.CreateExt();
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Nat224.Mul(x, y, tt);
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Reduce(tt, z);
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}
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public static void MultiplyAddToExt(uint[] x, uint[] y, uint[] zz)
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{
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uint c = Nat224.MulAddTo(x, y, zz);
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if (c != 0 || (zz[13] == PExt13 && Nat.Gte(14, zz, PExt)))
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{
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if (Nat.AddTo(PExtInv.Length, PExtInv, zz) != 0)
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{
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Nat.IncAt(14, zz, PExtInv.Length);
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}
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}
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}
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public static void Negate(uint[] x, uint[] z)
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{
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if (Nat224.IsZero(x))
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{
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Nat224.Zero(z);
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}
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else
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{
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Nat224.Sub(P, x, z);
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}
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}
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public static void Reduce(uint[] xx, uint[] z)
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{
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long xx10 = xx[10], xx11 = xx[11], xx12 = xx[12], xx13 = xx[13];
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const long n = 1;
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long t0 = (long)xx[7] + xx11 - n;
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long t1 = (long)xx[8] + xx12;
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long t2 = (long)xx[9] + xx13;
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long cc = 0;
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cc += (long)xx[0] - t0;
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long z0 = (uint)cc;
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cc >>= 32;
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cc += (long)xx[1] - t1;
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z[1] = (uint)cc;
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cc >>= 32;
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cc += (long)xx[2] - t2;
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z[2] = (uint)cc;
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cc >>= 32;
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cc += (long)xx[3] + t0 - xx10;
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long z3 = (uint)cc;
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cc >>= 32;
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cc += (long)xx[4] + t1 - xx11;
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z[4] = (uint)cc;
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cc >>= 32;
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cc += (long)xx[5] + t2 - xx12;
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z[5] = (uint)cc;
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cc >>= 32;
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cc += (long)xx[6] + xx10 - xx13;
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z[6] = (uint)cc;
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cc >>= 32;
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cc += n;
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Debug.Assert(cc >= 0);
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z3 += cc;
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z0 -= cc;
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z[0] = (uint)z0;
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cc = z0 >> 32;
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if (cc != 0)
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{
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cc += (long)z[1];
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z[1] = (uint)cc;
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cc >>= 32;
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cc += (long)z[2];
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z[2] = (uint)cc;
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z3 += cc >> 32;
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}
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z[3] = (uint)z3;
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cc = z3 >> 32;
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Debug.Assert(cc == 0 || cc == 1);
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if ((cc != 0 && Nat.IncAt(7, z, 4) != 0)
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|| (z[6] == P6 && Nat224.Gte(z, P)))
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{
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AddPInvTo(z);
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}
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}
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public static void Reduce32(uint x, uint[] z)
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{
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long cc = 0;
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if (x != 0)
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{
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long xx07 = x;
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cc += (long)z[0] - xx07;
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z[0] = (uint)cc;
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cc >>= 32;
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if (cc != 0)
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{
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cc += (long)z[1];
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z[1] = (uint)cc;
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cc >>= 32;
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cc += (long)z[2];
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z[2] = (uint)cc;
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cc >>= 32;
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}
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cc += (long)z[3] + xx07;
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z[3] = (uint)cc;
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cc >>= 32;
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Debug.Assert(cc == 0 || cc == 1);
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}
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if ((cc != 0 && Nat.IncAt(7, z, 4) != 0)
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|| (z[6] == P6 && Nat224.Gte(z, P)))
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{
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AddPInvTo(z);
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}
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}
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public static void Square(uint[] x, uint[] z)
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{
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uint[] tt = Nat224.CreateExt();
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Nat224.Square(x, tt);
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Reduce(tt, z);
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}
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public static void SquareN(uint[] x, int n, uint[] z)
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{
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Debug.Assert(n > 0);
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uint[] tt = Nat224.CreateExt();
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Nat224.Square(x, tt);
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Reduce(tt, z);
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while (--n > 0)
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{
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Nat224.Square(z, tt);
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Reduce(tt, z);
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}
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}
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public static void Subtract(uint[] x, uint[] y, uint[] z)
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{
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int c = Nat224.Sub(x, y, z);
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if (c != 0)
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{
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SubPInvFrom(z);
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}
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}
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public static void SubtractExt(uint[] xx, uint[] yy, uint[] zz)
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{
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int c = Nat.Sub(14, xx, yy, zz);
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if (c != 0)
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{
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if (Nat.SubFrom(PExtInv.Length, PExtInv, zz) != 0)
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{
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Nat.DecAt(14, zz, PExtInv.Length);
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}
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}
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}
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public static void Twice(uint[] x, uint[] z)
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{
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uint c = Nat.ShiftUpBit(7, x, 0, z);
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if (c != 0 || (z[6] == P6 && Nat224.Gte(z, P)))
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{
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AddPInvTo(z);
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}
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}
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private static void AddPInvTo(uint[] z)
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{
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long c = (long)z[0] - 1;
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z[0] = (uint)c;
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c >>= 32;
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if (c != 0)
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{
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c += (long)z[1];
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z[1] = (uint)c;
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c >>= 32;
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c += (long)z[2];
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z[2] = (uint)c;
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c >>= 32;
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}
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c += (long)z[3] + 1;
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z[3] = (uint)c;
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c >>= 32;
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if (c != 0)
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{
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Nat.IncAt(7, z, 4);
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}
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}
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private static void SubPInvFrom(uint[] z)
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{
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long c = (long)z[0] + 1;
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z[0] = (uint)c;
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c >>= 32;
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if (c != 0)
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{
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c += (long)z[1];
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z[1] = (uint)c;
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c >>= 32;
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c += (long)z[2];
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z[2] = (uint)c;
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c >>= 32;
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}
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c += (long)z[3] - 1;
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z[3] = (uint)c;
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c >>= 32;
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if (c != 0)
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{
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Nat.DecAt(7, z, 4);
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}
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}
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}
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}
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#endif
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