SecT571K1Curve
using Org.BouncyCastle.Math.EC.Multiplier;
using Org.BouncyCastle.Math.Raw;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Math.EC.Custom.Sec
{
internal class SecT571K1Curve : AbstractF2mCurve
{
private class SecT571K1LookupTable : AbstractECLookupTable
{
private readonly SecT571K1Curve m_outer;
private readonly ulong[] m_table;
private readonly int m_size;
public override int Size => m_size;
internal SecT571K1LookupTable(SecT571K1Curve outer, ulong[] table, int size)
{
m_outer = outer;
m_table = table;
m_size = size;
}
public override ECPoint Lookup(int index)
{
ulong[] array = Nat576.Create64();
ulong[] array2 = Nat576.Create64();
int num = 0;
for (int i = 0; i < m_size; i++) {
ulong num2 = (ulong)((i ^ index) - 1 >> 31);
for (int j = 0; j < 9; j++) {
array[j] ^= (m_table[num + j] & num2);
array2[j] ^= (m_table[num + 9 + j] & num2);
}
num += 18;
}
return CreatePoint(array, array2);
}
public override ECPoint LookupVar(int index)
{
ulong[] array = Nat576.Create64();
ulong[] array2 = Nat576.Create64();
int num = index * 9 * 2;
for (int i = 0; i < 9; i++) {
array[i] = m_table[num + i];
array2[i] = m_table[num + 9 + i];
}
return CreatePoint(array, array2);
}
private ECPoint CreatePoint(ulong[] x, ulong[] y)
{
return m_outer.CreateRawPoint(new SecT571FieldElement(x), new SecT571FieldElement(y), SECT571K1_AFFINE_ZS);
}
}
private const int SECT571K1_DEFAULT_COORDS = 6;
private const int SECT571K1_FE_LONGS = 9;
private static readonly ECFieldElement[] SECT571K1_AFFINE_ZS = new ECFieldElement[1] {
new SecT571FieldElement(BigInteger.One)
};
protected readonly SecT571K1Point m_infinity;
public override ECPoint Infinity => m_infinity;
public override int FieldSize => 571;
public override bool IsKoblitz => true;
public virtual int M => 571;
public virtual bool IsTrinomial => false;
public virtual int K1 => 2;
public virtual int K2 => 5;
public virtual int K3 => 10;
public SecT571K1Curve()
: base(571, 2, 5, 10)
{
m_infinity = new SecT571K1Point(this, null, null);
m_a = FromBigInteger(BigInteger.Zero);
m_b = FromBigInteger(BigInteger.One);
m_order = new BigInteger(1, Hex.DecodeStrict("020000000000000000000000000000000000000000000000000000000000000000000000131850E1F19A63E4B391A8DB917F4138B630D84BE5D639381E91DEB45CFE778F637C1001"));
m_cofactor = BigInteger.ValueOf(4);
m_coord = 6;
}
protected override ECCurve CloneCurve()
{
return new SecT571K1Curve();
}
public override bool SupportsCoordinateSystem(int coord)
{
if (coord == 6)
return true;
return false;
}
protected override ECMultiplier CreateDefaultMultiplier()
{
return new WTauNafMultiplier();
}
public override ECFieldElement FromBigInteger(BigInteger x)
{
return new SecT571FieldElement(x);
}
protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y)
{
return new SecT571K1Point(this, x, y);
}
protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y, ECFieldElement[] zs)
{
return new SecT571K1Point(this, x, y, zs);
}
public override ECLookupTable CreateCacheSafeLookupTable(ECPoint[] points, int off, int len)
{
ulong[] array = new ulong[len * 9 * 2];
int num = 0;
for (int i = 0; i < len; i++) {
ECPoint obj = points[off + i];
Nat576.Copy64(((SecT571FieldElement)obj.RawXCoord).x, 0, array, num);
num += 9;
Nat576.Copy64(((SecT571FieldElement)obj.RawYCoord).x, 0, array, num);
num += 9;
}
return new SecT571K1LookupTable(this, array, len);
}
}
}