SecP160R2Curve
using Org.BouncyCastle.Math.Raw;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Math.EC.Custom.Sec
{
internal class SecP160R2Curve : AbstractFpCurve
{
private class SecP160R2LookupTable : AbstractECLookupTable
{
private readonly SecP160R2Curve m_outer;
private readonly uint[] m_table;
private readonly int m_size;
public override int Size => m_size;
internal SecP160R2LookupTable(SecP160R2Curve outer, uint[] table, int size)
{
m_outer = outer;
m_table = table;
m_size = size;
}
public override ECPoint Lookup(int index)
{
uint[] array = Nat160.Create();
uint[] array2 = Nat160.Create();
int num = 0;
for (int i = 0; i < m_size; i++) {
uint num2 = (uint)((i ^ index) - 1 >> 31);
for (int j = 0; j < 5; j++) {
array[j] ^= (m_table[num + j] & num2);
array2[j] ^= (m_table[num + 5 + j] & num2);
}
num += 10;
}
return CreatePoint(array, array2);
}
public override ECPoint LookupVar(int index)
{
uint[] array = Nat160.Create();
uint[] array2 = Nat160.Create();
int num = index * 5 * 2;
for (int i = 0; i < 5; i++) {
array[i] = m_table[num + i];
array2[i] = m_table[num + 5 + i];
}
return CreatePoint(array, array2);
}
private ECPoint CreatePoint(uint[] x, uint[] y)
{
return m_outer.CreateRawPoint(new SecP160R2FieldElement(x), new SecP160R2FieldElement(y), SECP160R2_AFFINE_ZS);
}
}
public static readonly BigInteger q = SecP160R2FieldElement.Q;
private const int SECP160R2_DEFAULT_COORDS = 2;
private const int SECP160R2_FE_INTS = 5;
private static readonly ECFieldElement[] SECP160R2_AFFINE_ZS = new ECFieldElement[1] {
new SecP160R2FieldElement(BigInteger.One)
};
protected readonly SecP160R2Point m_infinity;
public virtual BigInteger Q => q;
public override ECPoint Infinity => m_infinity;
public override int FieldSize => q.BitLength;
public SecP160R2Curve()
: base(q, true)
{
m_infinity = new SecP160R2Point(this, null, null);
m_a = FromBigInteger(new BigInteger(1, Hex.DecodeStrict("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFAC70")));
m_b = FromBigInteger(new BigInteger(1, Hex.DecodeStrict("B4E134D3FB59EB8BAB57274904664D5AF50388BA")));
m_order = new BigInteger(1, Hex.DecodeStrict("0100000000000000000000351EE786A818F3A1A16B"));
m_cofactor = BigInteger.One;
m_coord = 2;
}
protected override ECCurve CloneCurve()
{
return new SecP160R2Curve();
}
public override bool SupportsCoordinateSystem(int coord)
{
if (coord == 2)
return true;
return false;
}
public override ECFieldElement FromBigInteger(BigInteger x)
{
return new SecP160R2FieldElement(x);
}
protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y)
{
return new SecP160R2Point(this, x, y);
}
protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y, ECFieldElement[] zs)
{
return new SecP160R2Point(this, x, y, zs);
}
public override ECLookupTable CreateCacheSafeLookupTable(ECPoint[] points, int off, int len)
{
uint[] array = new uint[len * 5 * 2];
int num = 0;
for (int i = 0; i < len; i++) {
ECPoint obj = points[off + i];
Nat160.Copy(((SecP160R2FieldElement)obj.RawXCoord).x, 0, array, num);
num += 5;
Nat160.Copy(((SecP160R2FieldElement)obj.RawYCoord).x, 0, array, num);
num += 5;
}
return new SecP160R2LookupTable(this, array, len);
}
public override ECFieldElement RandomFieldElement(SecureRandom r)
{
uint[] array = Nat160.Create();
SecP160R2Field.Random(r, array);
return new SecP160R2FieldElement(array);
}
public override ECFieldElement RandomFieldElementMult(SecureRandom r)
{
uint[] array = Nat160.Create();
SecP160R2Field.RandomMult(r, array);
return new SecP160R2FieldElement(array);
}
}
}