SecP192R1Field
class SecP192R1Field
using Org.BouncyCastle.Crypto.Utilities;
using Org.BouncyCastle.Math.Raw;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Math.EC.Custom.Sec
{
internal class SecP192R1Field
{
internal static readonly uint[] P = new uint[6] {
uint.MaxValue,
uint.MaxValue,
4294967294,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue
};
private static readonly uint[] PExt = new uint[12] {
1,
0,
2,
0,
1,
0,
4294967294,
uint.MaxValue,
4294967293,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue
};
private static readonly uint[] PExtInv = new uint[9] {
uint.MaxValue,
uint.MaxValue,
4294967293,
uint.MaxValue,
4294967294,
uint.MaxValue,
1,
0,
2
};
private const uint P5 = uint.MaxValue;
private const uint PExt11 = uint.MaxValue;
public static void Add(uint[] x, uint[] y, uint[] z)
{
if (Nat192.Add(x, y, z) != 0 || (z[5] == uint.MaxValue && Nat192.Gte(z, P)))
AddPInvTo(z);
}
public static void AddExt(uint[] xx, uint[] yy, uint[] zz)
{
if ((Nat.Add(12, xx, yy, zz) != 0 || (zz[11] == uint.MaxValue && Nat.Gte(12, zz, PExt))) && Nat.AddTo(PExtInv.Length, PExtInv, zz) != 0)
Nat.IncAt(12, zz, PExtInv.Length);
}
public static void AddOne(uint[] x, uint[] z)
{
if (Nat.Inc(6, x, z) != 0 || (z[5] == uint.MaxValue && Nat192.Gte(z, P)))
AddPInvTo(z);
}
public static uint[] FromBigInteger(BigInteger x)
{
uint[] array = Nat.FromBigInteger(192, x);
if (array[5] == uint.MaxValue && Nat192.Gte(array, P))
Nat192.SubFrom(P, array);
return array;
}
public static void Half(uint[] x, uint[] z)
{
if ((x[0] & 1) == 0)
Nat.ShiftDownBit(6, x, 0, z);
else {
uint c = Nat192.Add(x, P, z);
Nat.ShiftDownBit(6, z, c);
}
}
public static void Inv(uint[] x, uint[] z)
{
Mod.CheckedModOddInverse(P, x, z);
}
public static int IsZero(uint[] x)
{
uint num = 0;
for (int i = 0; i < 6; i++) {
num |= x[i];
}
num = ((num >> 1) | (num & 1));
return (int)(num - 1) >> 31;
}
public static void Multiply(uint[] x, uint[] y, uint[] z)
{
uint[] array = Nat192.CreateExt();
Nat192.Mul(x, y, array);
Reduce(array, z);
}
public static void MultiplyAddToExt(uint[] x, uint[] y, uint[] zz)
{
if ((Nat192.MulAddTo(x, y, zz) != 0 || (zz[11] == uint.MaxValue && Nat.Gte(12, zz, PExt))) && Nat.AddTo(PExtInv.Length, PExtInv, zz) != 0)
Nat.IncAt(12, zz, PExtInv.Length);
}
public static void Negate(uint[] x, uint[] z)
{
if (IsZero(x) != 0)
Nat192.Sub(P, P, z);
else
Nat192.Sub(P, x, z);
}
public static void Random(SecureRandom r, uint[] z)
{
byte[] array = new byte[24];
do {
r.NextBytes(array);
Pack.LE_To_UInt32(array, 0, z, 0, 6);
} while (Nat.LessThan(6, z, P) == 0);
}
public static void RandomMult(SecureRandom r, uint[] z)
{
do {
Random(r, z);
} while (IsZero(z) != 0);
}
public static void Reduce(uint[] xx, uint[] z)
{
ulong num = xx[6];
ulong num2 = xx[7];
ulong num3 = xx[8];
ulong num4 = xx[9];
ulong num5 = xx[10];
ulong num6 = xx[11];
ulong num7 = num + num5;
ulong num8 = num2 + num6;
ulong num9 = 0;
num9 += xx[0] + num7;
uint num10 = (uint)num9;
num9 >>= 32;
num9 += xx[1] + num8;
z[1] = (uint)num9;
num9 >>= 32;
num7 += num3;
num8 += num4;
num9 += xx[2] + num7;
ulong num11 = (uint)num9;
num9 >>= 32;
num9 += xx[3] + num8;
z[3] = (uint)num9;
num9 >>= 32;
num7 -= num;
num8 -= num2;
num9 += xx[4] + num7;
z[4] = (uint)num9;
num9 >>= 32;
num9 += xx[5] + num8;
z[5] = (uint)num9;
num9 >>= 32;
num11 += num9;
num9 += num10;
z[0] = (uint)num9;
num9 >>= 32;
if (num9 != 0) {
num9 += z[1];
z[1] = (uint)num9;
num11 += num9 >> 32;
}
z[2] = (uint)num11;
num9 = num11 >> 32;
if ((num9 != 0 && Nat.IncAt(6, z, 3) != 0) || (z[5] == uint.MaxValue && Nat192.Gte(z, P)))
AddPInvTo(z);
}
public static void Reduce32(uint x, uint[] z)
{
ulong num = 0;
if (x != 0) {
num = (ulong)((long)num + ((long)z[0] + (long)x));
z[0] = (uint)num;
num >>= 32;
if (num != 0) {
num += z[1];
z[1] = (uint)num;
num >>= 32;
}
num = (ulong)((long)num + ((long)z[2] + (long)x));
z[2] = (uint)num;
num >>= 32;
}
if ((num != 0 && Nat.IncAt(6, z, 3) != 0) || (z[5] == uint.MaxValue && Nat192.Gte(z, P)))
AddPInvTo(z);
}
public static void Square(uint[] x, uint[] z)
{
uint[] array = Nat192.CreateExt();
Nat192.Square(x, array);
Reduce(array, z);
}
public static void SquareN(uint[] x, int n, uint[] z)
{
uint[] array = Nat192.CreateExt();
Nat192.Square(x, array);
Reduce(array, z);
while (--n > 0) {
Nat192.Square(z, array);
Reduce(array, z);
}
}
public static void Subtract(uint[] x, uint[] y, uint[] z)
{
if (Nat192.Sub(x, y, z) != 0)
SubPInvFrom(z);
}
public static void SubtractExt(uint[] xx, uint[] yy, uint[] zz)
{
if (Nat.Sub(12, xx, yy, zz) != 0 && Nat.SubFrom(PExtInv.Length, PExtInv, zz) != 0)
Nat.DecAt(12, zz, PExtInv.Length);
}
public static void Twice(uint[] x, uint[] z)
{
if (Nat.ShiftUpBit(6, x, 0, z) != 0 || (z[5] == uint.MaxValue && Nat192.Gte(z, P)))
AddPInvTo(z);
}
private static void AddPInvTo(uint[] z)
{
long num = (long)z[0] + 1;
z[0] = (uint)num;
num >>= 32;
if (num != 0) {
num += z[1];
z[1] = (uint)num;
num >>= 32;
}
num += (long)z[2] + 1;
z[2] = (uint)num;
num >>= 32;
if (num != 0)
Nat.IncAt(6, z, 3);
}
private static void SubPInvFrom(uint[] z)
{
long num = (long)z[0] - 1;
z[0] = (uint)num;
num >>= 32;
if (num != 0) {
num += z[1];
z[1] = (uint)num;
num >>= 32;
}
num += (long)z[2] - 1;
z[2] = (uint)num;
num >>= 32;
if (num != 0)
Nat.DecAt(6, z, 3);
}
}
}