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using System;
using Org.BouncyCastle.Math.Raw;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Math.EC.Custom.Sec
{
internal class SecT193R2Curve
: AbstractF2mCurve
{
private const int SECT193R2_DEFAULT_COORDS = COORD_LAMBDA_PROJECTIVE;
private const int SECT193R2_FE_LONGS = 4;
private static readonly ECFieldElement[] SECT193R2_AFFINE_ZS = new ECFieldElement[] { new SecT193FieldElement(BigInteger.One) };
protected readonly SecT193R2Point m_infinity;
public SecT193R2Curve()
: base(193, 15, 0, 0)
{
this.m_infinity = new SecT193R2Point(this, null, null);
this.m_a = FromBigInteger(new BigInteger(1, Hex.Decode("0163F35A5137C2CE3EA6ED8667190B0BC43ECD69977702709B")));
this.m_b = FromBigInteger(new BigInteger(1, Hex.Decode("00C9BB9E8927D4D64C377E2AB2856A5B16E3EFB7F61D4316AE")));
this.m_order = new BigInteger(1, Hex.Decode("010000000000000000000000015AAB561B005413CCD4EE99D5"));
this.m_cofactor = BigInteger.Two;
this.m_coord = SECT193R2_DEFAULT_COORDS;
}
protected override ECCurve CloneCurve()
{
return new SecT193R2Curve();
}
public override bool SupportsCoordinateSystem(int coord)
{
switch (coord)
{
case COORD_LAMBDA_PROJECTIVE:
return true;
default:
return false;
}
}
public override ECPoint Infinity
{
get { return m_infinity; }
}
public override int FieldSize
{
get { return 193; }
}
public override ECFieldElement FromBigInteger(BigInteger x)
{
return new SecT193FieldElement(x);
}
protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y, bool withCompression)
{
return new SecT193R2Point(this, x, y, withCompression);
}
protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y, ECFieldElement[] zs, bool withCompression)
{
return new SecT193R2Point(this, x, y, zs, withCompression);
}
public override bool IsKoblitz
{
get { return false; }
}
public virtual int M
{
get { return 193; }
}
public virtual bool IsTrinomial
{
get { return true; }
}
public virtual int K1
{
get { return 15; }
}
public virtual int K2
{
get { return 0; }
}
public virtual int K3
{
get { return 0; }
}
public override ECLookupTable CreateCacheSafeLookupTable(ECPoint[] points, int off, int len)
{
ulong[] table = new ulong[len * SECT193R2_FE_LONGS * 2];
{
int pos = 0;
for (int i = 0; i < len; ++i)
{
ECPoint p = points[off + i];
Nat256.Copy64(((SecT193FieldElement)p.RawXCoord).x, 0, table, pos); pos += SECT193R2_FE_LONGS;
Nat256.Copy64(((SecT193FieldElement)p.RawYCoord).x, 0, table, pos); pos += SECT193R2_FE_LONGS;
}
}
return new SecT193R2LookupTable(this, table, len);
}
private class SecT193R2LookupTable
: AbstractECLookupTable
{
private readonly SecT193R2Curve m_outer;
private readonly ulong[] m_table;
private readonly int m_size;
internal SecT193R2LookupTable(SecT193R2Curve outer, ulong[] table, int size)
{
this.m_outer = outer;
this.m_table = table;
this.m_size = size;
}
public override int Size
{
get { return m_size; }
}
public override ECPoint Lookup(int index)
{
ulong[] x = Nat256.Create64(), y = Nat256.Create64();
int pos = 0;
for (int i = 0; i < m_size; ++i)
{
ulong MASK = (ulong)(long)(((i ^ index) - 1) >> 31);
for (int j = 0; j < SECT193R2_FE_LONGS; ++j)
{
x[j] ^= m_table[pos + j] & MASK;
y[j] ^= m_table[pos + SECT193R2_FE_LONGS + j] & MASK;
}
pos += (SECT193R2_FE_LONGS * 2);
}
return CreatePoint(x, y);
}
public override ECPoint LookupVar(int index)
{
ulong[] x = Nat256.Create64(), y = Nat256.Create64();
int pos = index * SECT193R2_FE_LONGS * 2;
for (int j = 0; j < SECT193R2_FE_LONGS; ++j)
{
x[j] = m_table[pos + j];
y[j] = m_table[pos + SECT193R2_FE_LONGS + j];
}
return CreatePoint(x, y);
}
private ECPoint CreatePoint(ulong[] x, ulong[] y)
{
return m_outer.CreateRawPoint(new SecT193FieldElement(x), new SecT193FieldElement(y), SECT193R2_AFFINE_ZS, false);
}
}
}
}
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