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Timur Kozanov
2026-07-03 05:02:26 +03:00
commit 374ff1e689
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Runtime/3rdParty/BouncyCastle/math/ec/custom/sec/SecP256K1Field.cs vendored Normal file
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#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
#pragma warning disable
using System;
using System.Diagnostics;
using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Utilities;
using Best.HTTP.SecureProtocol.Org.BouncyCastle.Math.Raw;
using Best.HTTP.SecureProtocol.Org.BouncyCastle.Security;
namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Math.EC.Custom.Sec
{
internal class SecP256K1Field
{
// 2^256 - 2^32 - 2^9 - 2^8 - 2^7 - 2^6 - 2^4 - 1
internal static readonly uint[] P = new uint[]{ 0xFFFFFC2F, 0xFFFFFFFE, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
private static readonly uint[] PExt = new uint[]{ 0x000E90A1, 0x000007A2, 0x00000001, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0xFFFFF85E, 0xFFFFFFFD, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF };
private static readonly uint[] PExtInv = new uint[]{ 0xFFF16F5F, 0xFFFFF85D, 0xFFFFFFFE, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x000007A1, 0x00000002 };
private const uint P7 = 0xFFFFFFFF;
private const uint PExt15 = 0xFFFFFFFF;
private const uint PInv33 = 0x3D1;
public static void Add(uint[] x, uint[] y, uint[] z)
{
uint c = Nat256.Add(x, y, z);
if (c != 0 || (z[7] == P7 && Nat256.Gte(z, P)))
{
Nat.Add33To(8, PInv33, z);
}
}
public static void AddExt(uint[] xx, uint[] yy, uint[] zz)
{
uint c = Nat.Add(16, xx, yy, zz);
if (c != 0 || (zz[15] == PExt15 && Nat.Gte(16, zz, PExt)))
{
if (Nat.AddTo(PExtInv.Length, PExtInv, zz) != 0)
{
Nat.IncAt(16, zz, PExtInv.Length);
}
}
}
public static void AddOne(uint[] x, uint[] z)
{
uint c = Nat.Inc(8, x, z);
if (c != 0 || (z[7] == P7 && Nat256.Gte(z, P)))
{
Nat.Add33To(8, PInv33, z);
}
}
public static uint[] FromBigInteger(BigInteger x)
{
uint[] z = Nat.FromBigInteger(256, x);
if (z[7] == P7 && 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
{
uint c = Nat256.Add(x, P, z);
Nat.ShiftDownBit(8, z, c);
}
}
public static void Inv(uint[] x, uint[] z)
{
Mod.CheckedModOddInverse(P, x, z);
}
public static int IsZero(uint[] x)
{
uint d = 0;
for (int i = 0; i < 8; ++i)
{
d |= x[i];
}
d = (d >> 1) | (d & 1);
return ((int)d - 1) >> 31;
}
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 Multiply(uint[] x, uint[] y, uint[] z, uint[] tt)
{
Nat256.Mul(x, y, tt);
Reduce(tt, z);
}
public static void MultiplyAddToExt(uint[] x, uint[] y, uint[] zz)
{
uint c = Nat256.MulAddTo(x, y, zz);
if (c != 0 || (zz[15] == PExt15 && Nat.Gte(16, zz, PExt)))
{
if (Nat.AddTo(PExtInv.Length, PExtInv, zz) != 0)
{
Nat.IncAt(16, zz, PExtInv.Length);
}
}
}
public static void Negate(uint[] x, uint[] z)
{
if (0 != IsZero(x))
{
Nat256.Sub(P, P, z);
}
else
{
Nat256.Sub(P, x, z);
}
}
public static void Random(SecureRandom r, uint[] z)
{
byte[] bb = new byte[8 * 4];
do
{
r.NextBytes(bb);
Pack.LE_To_UInt32(bb, 0, z, 0, 8);
}
while (0 == Nat.LessThan(8, z, P));
}
public static void RandomMult(SecureRandom r, uint[] z)
{
do
{
Random(r, z);
}
while (0 != IsZero(z));
}
public static void Reduce(uint[] xx, uint[] z)
{
ulong cc = Nat256.Mul33Add(PInv33, xx, 8, xx, 0, z, 0);
uint c = Nat256.Mul33DWordAdd(PInv33, cc, z, 0);
Debug.Assert(c == 0 || c == 1);
if (c != 0 || (z[7] == P7 && Nat256.Gte(z, P)))
{
Nat.Add33To(8, PInv33, z);
}
}
public static void Reduce32(uint x, uint[] z)
{
if ((x != 0 && Nat256.Mul33WordAdd(PInv33, x, z, 0) != 0)
|| (z[7] == P7 && Nat256.Gte(z, P)))
{
Nat.Add33To(8, PInv33, z);
}
}
public static void Square(uint[] x, uint[] z)
{
uint[] tt = Nat256.CreateExt();
Nat256.Square(x, tt);
Reduce(tt, z);
}
public static void Square(uint[] x, uint[] z, uint[] tt)
{
Nat256.Square(x, tt);
Reduce(tt, z);
}
public static void SquareN(uint[] x, int n, uint[] z)
{
Debug.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 SquareN(uint[] x, int n, uint[] z, uint[] tt)
{
Debug.Assert(n > 0);
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)
{
Nat.Sub33From(8, PInv33, z);
}
}
public static void SubtractExt(uint[] xx, uint[] yy, uint[] zz)
{
int c = Nat.Sub(16, xx, yy, zz);
if (c != 0)
{
if (Nat.SubFrom(PExtInv.Length, PExtInv, zz) != 0)
{
Nat.DecAt(16, zz, PExtInv.Length);
}
}
}
public static void Twice(uint[] x, uint[] z)
{
uint c = Nat.ShiftUpBit(8, x, 0, z);
if (c != 0 || (z[7] == P7 && Nat256.Gte(z, P)))
{
Nat.Add33To(8, PInv33, z);
}
}
}
}
#pragma warning restore
#endif