SecP384R1Field
class SecP384R1Field
using Org.BouncyCastle.Crypto.Utilities;
using Org.BouncyCastle.Math.Raw;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Math.EC.Custom.Sec
{
internal class SecP384R1Field
{
internal static readonly uint[] P = new uint[12] {
uint.MaxValue,
0,
0,
uint.MaxValue,
4294967294,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue
};
private static readonly uint[] PExt = new uint[24] {
1,
4294967294,
0,
2,
0,
4294967294,
0,
2,
1,
0,
0,
0,
4294967294,
1,
0,
4294967294,
4294967293,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue
};
private static readonly uint[] PExtInv = new uint[17] {
uint.MaxValue,
1,
uint.MaxValue,
4294967293,
uint.MaxValue,
1,
uint.MaxValue,
4294967293,
4294967294,
uint.MaxValue,
uint.MaxValue,
uint.MaxValue,
1,
4294967294,
uint.MaxValue,
1,
2
};
private const uint P11 = uint.MaxValue;
private const uint PExt23 = uint.MaxValue;
public static void Add(uint[] x, uint[] y, uint[] z)
{
if (Nat.Add(12, x, y, z) != 0 || (z[11] == uint.MaxValue && Nat.Gte(12, z, P)))
AddPInvTo(z);
}
public static void AddExt(uint[] xx, uint[] yy, uint[] zz)
{
if ((Nat.Add(24, xx, yy, zz) != 0 || (zz[23] == uint.MaxValue && Nat.Gte(24, zz, PExt))) && Nat.AddTo(PExtInv.Length, PExtInv, zz) != 0)
Nat.IncAt(24, zz, PExtInv.Length);
}
public static void AddOne(uint[] x, uint[] z)
{
if (Nat.Inc(12, x, z) != 0 || (z[11] == uint.MaxValue && Nat.Gte(12, z, P)))
AddPInvTo(z);
}
public static uint[] FromBigInteger(BigInteger x)
{
uint[] array = Nat.FromBigInteger(384, x);
if (array[11] == uint.MaxValue && Nat.Gte(12, array, P))
Nat.SubFrom(12, P, array);
return array;
}
public static void Half(uint[] x, uint[] z)
{
if ((x[0] & 1) == 0)
Nat.ShiftDownBit(12, x, 0, z);
else {
uint c = Nat.Add(12, x, P, z);
Nat.ShiftDownBit(12, 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 < 12; 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 = Nat.Create(24);
Nat384.Mul(x, y, array);
Reduce(array, z);
}
public static void Multiply(uint[] x, uint[] y, uint[] z, uint[] tt)
{
Nat384.Mul(x, y, tt);
Reduce(tt, z);
}
public static void Negate(uint[] x, uint[] z)
{
if (IsZero(x) != 0)
Nat.Sub(12, P, P, z);
else
Nat.Sub(12, P, x, z);
}
public static void Random(SecureRandom r, uint[] z)
{
byte[] array = new byte[48];
do {
r.NextBytes(array);
Pack.LE_To_UInt32(array, 0, z, 0, 12);
} while (Nat.LessThan(12, 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[16];
long num2 = xx[17];
long num3 = xx[18];
long num4 = xx[19];
long num5 = xx[20];
long num6 = xx[21];
long num7 = xx[22];
long num8 = xx[23];
long num9 = xx[12] + num5 - 1;
long num10 = xx[13] + num7;
long num11 = xx[14] + num7 + num8;
long num12 = xx[15] + num8;
long num13 = num2 + num6;
long num14 = num6 - num8;
long num15 = num7 - num8;
long num16 = num9 + num14;
long num17 = 0;
num17 += xx[0] + num16;
z[0] = (uint)num17;
num17 >>= 32;
num17 += xx[1] + num8 - num9 + num10;
z[1] = (uint)num17;
num17 >>= 32;
num17 += xx[2] - num6 - num10 + num11;
z[2] = (uint)num17;
num17 >>= 32;
num17 += xx[3] - num11 + num12 + num16;
z[3] = (uint)num17;
num17 >>= 32;
num17 += xx[4] + num + num6 + num10 - num12 + num16;
z[4] = (uint)num17;
num17 >>= 32;
num17 += xx[5] - num + num10 + num11 + num13;
z[5] = (uint)num17;
num17 >>= 32;
num17 += xx[6] + num3 - num2 + num11 + num12;
z[6] = (uint)num17;
num17 >>= 32;
num17 += xx[7] + num + num4 - num3 + num12;
z[7] = (uint)num17;
num17 >>= 32;
num17 += xx[8] + num + num2 + num5 - num4;
z[8] = (uint)num17;
num17 >>= 32;
num17 += xx[9] + num3 - num5 + num13;
z[9] = (uint)num17;
num17 >>= 32;
num17 += xx[10] + num3 + num4 - num14 + num15;
z[10] = (uint)num17;
num17 >>= 32;
num17 += xx[11] + num4 + num5 - num15;
z[11] = (uint)num17;
num17 >>= 32;
num17++;
Reduce32((uint)num17, 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;
num += z[1] - num2;
z[1] = (uint)num;
num >>= 32;
if (num != 0) {
num += z[2];
z[2] = (uint)num;
num >>= 32;
}
num += z[3] + num2;
z[3] = (uint)num;
num >>= 32;
num += z[4] + num2;
z[4] = (uint)num;
num >>= 32;
}
if ((num != 0 && Nat.IncAt(12, z, 5) != 0) || (z[11] == uint.MaxValue && Nat.Gte(12, z, P)))
AddPInvTo(z);
}
public static void Square(uint[] x, uint[] z)
{
uint[] array = Nat.Create(24);
Nat384.Square(x, array);
Reduce(array, z);
}
public static void Square(uint[] x, uint[] z, uint[] tt)
{
Nat384.Square(x, tt);
Reduce(tt, z);
}
public static void SquareN(uint[] x, int n, uint[] z)
{
uint[] array = Nat.Create(24);
Nat384.Square(x, array);
Reduce(array, z);
while (--n > 0) {
Nat384.Square(z, array);
Reduce(array, z);
}
}
public static void SquareN(uint[] x, int n, uint[] z, uint[] tt)
{
Nat384.Square(x, tt);
Reduce(tt, z);
while (--n > 0) {
Nat384.Square(z, tt);
Reduce(tt, z);
}
}
public static void Subtract(uint[] x, uint[] y, uint[] z)
{
if (Nat.Sub(12, x, y, z) != 0)
SubPInvFrom(z);
}
public static void SubtractExt(uint[] xx, uint[] yy, uint[] zz)
{
if (Nat.Sub(24, xx, yy, zz) != 0 && Nat.SubFrom(PExtInv.Length, PExtInv, zz) != 0)
Nat.DecAt(24, zz, PExtInv.Length);
}
public static void Twice(uint[] x, uint[] z)
{
if (Nat.ShiftUpBit(12, x, 0, z) != 0 || (z[11] == uint.MaxValue && Nat.Gte(12, z, P)))
AddPInvTo(z);
}
private static void AddPInvTo(uint[] z)
{
long num = (long)z[0] + 1;
z[0] = (uint)num;
num >>= 32;
num += (long)z[1] - 1;
z[1] = (uint)num;
num >>= 32;
if (num != 0) {
num += z[2];
z[2] = (uint)num;
num >>= 32;
}
num += (long)z[3] + 1;
z[3] = (uint)num;
num >>= 32;
num += (long)z[4] + 1;
z[4] = (uint)num;
num >>= 32;
if (num != 0)
Nat.IncAt(12, z, 5);
}
private static void SubPInvFrom(uint[] z)
{
long num = (long)z[0] - 1;
z[0] = (uint)num;
num >>= 32;
num += (long)z[1] + 1;
z[1] = (uint)num;
num >>= 32;
if (num != 0) {
num += z[2];
z[2] = (uint)num;
num >>= 32;
}
num += (long)z[3] - 1;
z[3] = (uint)num;
num >>= 32;
num += (long)z[4] - 1;
z[4] = (uint)num;
num >>= 32;
if (num != 0)
Nat.DecAt(12, z, 5);
}
}
}