SecP224R1Field
class SecP224R1Field
using Org.BouncyCastle.Crypto.Utilities;
using Org.BouncyCastle.Math.Raw;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Math.EC.Custom.Sec
{
internal class SecP224R1Field
{
internal static readonly uint[] P = new uint[7] {
1,
0,
0,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue
};
private static readonly uint[] PExt = new uint[14] {
1,
0,
0,
4294967294,
uint.MaxValue,
uint.MaxValue,
0,
2,
0,
0,
4294967294,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue
};
private static readonly uint[] PExtInv = new uint[11] {
uint.MaxValue,
uint.MaxValue,
uint.MaxValue,
1,
0,
0,
uint.MaxValue,
4294967293,
uint.MaxValue,
uint.MaxValue,
1
};
private const uint P6 = uint.MaxValue;
private const uint PExt13 = uint.MaxValue;
public static void Add(uint[] x, uint[] y, uint[] z)
{
if (Nat224.Add(x, y, z) != 0 || (z[6] == uint.MaxValue && Nat224.Gte(z, P)))
AddPInvTo(z);
}
public static void AddExt(uint[] xx, uint[] yy, uint[] zz)
{
if ((Nat.Add(14, xx, yy, zz) != 0 || (zz[13] == uint.MaxValue && Nat.Gte(14, zz, PExt))) && Nat.AddTo(PExtInv.Length, PExtInv, zz) != 0)
Nat.IncAt(14, zz, PExtInv.Length);
}
public static void AddOne(uint[] x, uint[] z)
{
if (Nat.Inc(7, x, z) != 0 || (z[6] == uint.MaxValue && Nat224.Gte(z, P)))
AddPInvTo(z);
}
public static uint[] FromBigInteger(BigInteger x)
{
uint[] array = Nat.FromBigInteger(224, x);
if (array[6] == uint.MaxValue && Nat224.Gte(array, P))
Nat224.SubFrom(P, array);
return array;
}
public static void Half(uint[] x, uint[] z)
{
if ((x[0] & 1) == 0)
Nat.ShiftDownBit(7, x, 0, z);
else {
uint c = Nat224.Add(x, P, z);
Nat.ShiftDownBit(7, 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 < 7; 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 = Nat224.CreateExt();
Nat224.Mul(x, y, array);
Reduce(array, z);
}
public static void MultiplyAddToExt(uint[] x, uint[] y, uint[] zz)
{
if ((Nat224.MulAddTo(x, y, zz) != 0 || (zz[13] == uint.MaxValue && Nat.Gte(14, zz, PExt))) && Nat.AddTo(PExtInv.Length, PExtInv, zz) != 0)
Nat.IncAt(14, zz, PExtInv.Length);
}
public static void Negate(uint[] x, uint[] z)
{
if (IsZero(x) != 0)
Nat224.Sub(P, P, z);
else
Nat224.Sub(P, x, z);
}
public static void Random(SecureRandom r, uint[] z)
{
byte[] array = new byte[28];
do {
r.NextBytes(array);
Pack.LE_To_UInt32(array, 0, z, 0, 7);
} while (Nat.LessThan(7, 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)
{
long num = xx[10];
long num2 = xx[11];
long num3 = xx[12];
long num4 = xx[13];
long num5 = xx[7] + num2 - 1;
long num6 = xx[8] + num3;
long num7 = xx[9] + num4;
long num8 = 0;
num8 += xx[0] - num5;
long num9 = (uint)num8;
num8 >>= 32;
num8 += xx[1] - num6;
z[1] = (uint)num8;
num8 >>= 32;
num8 += xx[2] - num7;
z[2] = (uint)num8;
num8 >>= 32;
num8 += xx[3] + num5 - num;
long num10 = (uint)num8;
num8 >>= 32;
num8 += xx[4] + num6 - num2;
z[4] = (uint)num8;
num8 >>= 32;
num8 += xx[5] + num7 - num3;
z[5] = (uint)num8;
num8 >>= 32;
num8 += xx[6] + num - num4;
z[6] = (uint)num8;
num8 >>= 32;
num8++;
num10 += num8;
num9 -= num8;
z[0] = (uint)num9;
num8 = num9 >> 32;
if (num8 != 0) {
num8 += z[1];
z[1] = (uint)num8;
num8 >>= 32;
num8 += z[2];
z[2] = (uint)num8;
num10 += num8 >> 32;
}
z[3] = (uint)num10;
num8 = num10 >> 32;
if ((num8 != 0 && Nat.IncAt(7, z, 4) != 0) || (z[6] == uint.MaxValue && Nat224.Gte(z, P)))
AddPInvTo(z);
}
public static void Reduce32(uint x, uint[] z)
{
long num = 0;
if (x != 0) {
long num2 = x;
num += z[0] - num2;
z[0] = (uint)num;
num >>= 32;
if (num != 0) {
num += z[1];
z[1] = (uint)num;
num >>= 32;
num += z[2];
z[2] = (uint)num;
num >>= 32;
}
num += z[3] + num2;
z[3] = (uint)num;
num >>= 32;
}
if ((num != 0 && Nat.IncAt(7, z, 4) != 0) || (z[6] == uint.MaxValue && Nat224.Gte(z, P)))
AddPInvTo(z);
}
public static void Square(uint[] x, uint[] z)
{
uint[] array = Nat224.CreateExt();
Nat224.Square(x, array);
Reduce(array, z);
}
public static void SquareN(uint[] x, int n, uint[] z)
{
uint[] array = Nat224.CreateExt();
Nat224.Square(x, array);
Reduce(array, z);
while (--n > 0) {
Nat224.Square(z, array);
Reduce(array, z);
}
}
public static void Subtract(uint[] x, uint[] y, uint[] z)
{
if (Nat224.Sub(x, y, z) != 0)
SubPInvFrom(z);
}
public static void SubtractExt(uint[] xx, uint[] yy, uint[] zz)
{
if (Nat.Sub(14, xx, yy, zz) != 0 && Nat.SubFrom(PExtInv.Length, PExtInv, zz) != 0)
Nat.DecAt(14, zz, PExtInv.Length);
}
public static void Twice(uint[] x, uint[] z)
{
if (Nat.ShiftUpBit(7, x, 0, z) != 0 || (z[6] == uint.MaxValue && Nat224.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 += z[2];
z[2] = (uint)num;
num >>= 32;
}
num += (long)z[3] + 1;
z[3] = (uint)num;
num >>= 32;
if (num != 0)
Nat.IncAt(7, z, 4);
}
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 += z[2];
z[2] = (uint)num;
num >>= 32;
}
num += (long)z[3] - 1;
z[3] = (uint)num;
num >>= 32;
if (num != 0)
Nat.DecAt(7, z, 4);
}
}
}