SecT131R1Curve
using Org.BouncyCastle.Math.Raw;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Math.EC.Custom.Sec
{
internal class SecT131R1Curve : AbstractF2mCurve
{
private class SecT131R1LookupTable : AbstractECLookupTable
{
private readonly SecT131R1Curve m_outer;
private readonly ulong[] m_table;
private readonly int m_size;
public override int Size => m_size;
internal SecT131R1LookupTable(SecT131R1Curve outer, ulong[] table, int size)
{
m_outer = outer;
m_table = table;
m_size = size;
}
public override ECPoint Lookup(int index)
{
ulong[] array = Nat192.Create64();
ulong[] array2 = Nat192.Create64();
int num = 0;
for (int i = 0; i < m_size; i++) {
ulong num2 = (ulong)((i ^ index) - 1 >> 31);
for (int j = 0; j < 3; j++) {
array[j] ^= (m_table[num + j] & num2);
array2[j] ^= (m_table[num + 3 + j] & num2);
}
num += 6;
}
return CreatePoint(array, array2);
}
public override ECPoint LookupVar(int index)
{
ulong[] array = Nat192.Create64();
ulong[] array2 = Nat192.Create64();
int num = index * 3 * 2;
for (int i = 0; i < 3; i++) {
array[i] = m_table[num + i];
array2[i] = m_table[num + 3 + i];
}
return CreatePoint(array, array2);
}
private ECPoint CreatePoint(ulong[] x, ulong[] y)
{
return m_outer.CreateRawPoint(new SecT131FieldElement(x), new SecT131FieldElement(y), SECT131R1_AFFINE_ZS);
}
}
private const int SECT131R1_DEFAULT_COORDS = 6;
private const int SECT131R1_FE_LONGS = 3;
private static readonly ECFieldElement[] SECT131R1_AFFINE_ZS = new ECFieldElement[1] {
new SecT131FieldElement(BigInteger.One)
};
protected readonly SecT131R1Point m_infinity;
public override ECPoint Infinity => m_infinity;
public override int FieldSize => 131;
public override bool IsKoblitz => false;
public virtual int M => 131;
public virtual bool IsTrinomial => false;
public virtual int K1 => 2;
public virtual int K2 => 3;
public virtual int K3 => 8;
public SecT131R1Curve()
: base(131, 2, 3, 8)
{
m_infinity = new SecT131R1Point(this, null, null);
m_a = FromBigInteger(new BigInteger(1, Hex.DecodeStrict("07A11B09A76B562144418FF3FF8C2570B8")));
m_b = FromBigInteger(new BigInteger(1, Hex.DecodeStrict("0217C05610884B63B9C6C7291678F9D341")));
m_order = new BigInteger(1, Hex.DecodeStrict("0400000000000000023123953A9464B54D"));
m_cofactor = BigInteger.Two;
m_coord = 6;
}
protected override ECCurve CloneCurve()
{
return new SecT131R1Curve();
}
public override bool SupportsCoordinateSystem(int coord)
{
if (coord == 6)
return true;
return false;
}
public override ECFieldElement FromBigInteger(BigInteger x)
{
return new SecT131FieldElement(x);
}
protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y)
{
return new SecT131R1Point(this, x, y);
}
protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y, ECFieldElement[] zs)
{
return new SecT131R1Point(this, x, y, zs);
}
public override ECLookupTable CreateCacheSafeLookupTable(ECPoint[] points, int off, int len)
{
ulong[] array = new ulong[len * 3 * 2];
int num = 0;
for (int i = 0; i < len; i++) {
ECPoint obj = points[off + i];
Nat192.Copy64(((SecT131FieldElement)obj.RawXCoord).x, 0, array, num);
num += 3;
Nat192.Copy64(((SecT131FieldElement)obj.RawYCoord).x, 0, array, num);
num += 3;
}
return new SecT131R1LookupTable(this, array, len);
}
}
}