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package org.bouncycastle.math.ec.custom.sec;
import java.math.BigInteger;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECCurve.AbstractF2m;
import org.bouncycastle.math.ec.ECFieldElement;
import org.bouncycastle.math.ec.ECLookupTable;
import org.bouncycastle.math.ec.ECMultiplier;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.math.ec.WTauNafMultiplier;
import org.bouncycastle.math.raw.Nat192;
import org.bouncycastle.util.encoders.Hex;
public class SecT163K1Curve extends AbstractF2m
{
private static final int SecT163K1_DEFAULT_COORDS = COORD_LAMBDA_PROJECTIVE;
protected SecT163K1Point infinity;
public SecT163K1Curve()
{
super(163, 3, 6, 7);
this.infinity = new SecT163K1Point(this, null, null);
this.a = fromBigInteger(BigInteger.valueOf(1));
this.b = this.a;
this.order = new BigInteger(1, Hex.decode("04000000000000000000020108A2E0CC0D99F8A5EF"));
this.cofactor = BigInteger.valueOf(2);
this.coord = SecT163K1_DEFAULT_COORDS;
}
protected ECCurve cloneCurve()
{
return new SecT163K1Curve();
}
public boolean supportsCoordinateSystem(int coord)
{
switch (coord)
{
case COORD_LAMBDA_PROJECTIVE:
return true;
default:
return false;
}
}
protected ECMultiplier createDefaultMultiplier()
{
return new WTauNafMultiplier();
}
public int getFieldSize()
{
return 163;
}
public ECFieldElement fromBigInteger(BigInteger x)
{
return new SecT163FieldElement(x);
}
protected ECPoint createRawPoint(ECFieldElement x, ECFieldElement y, boolean withCompression)
{
return new SecT163K1Point(this, x, y, withCompression);
}
protected ECPoint createRawPoint(ECFieldElement x, ECFieldElement y, ECFieldElement[] zs, boolean withCompression)
{
return new SecT163K1Point(this, x, y, zs, withCompression);
}
public ECPoint getInfinity()
{
return infinity;
}
public boolean isKoblitz()
{
return true;
}
public int getM()
{
return 163;
}
public boolean isTrinomial()
{
return false;
}
public int getK1()
{
return 3;
}
public int getK2()
{
return 6;
}
public int getK3()
{
return 7;
}
public ECLookupTable createCacheSafeLookupTable(ECPoint[] points, int off, final int len)
{
final int FE_LONGS = 3;
final long[] table = new long[len * FE_LONGS * 2];
{
int pos = 0;
for (int i = 0; i < len; ++i)
{
ECPoint p = points[off + i];
Nat192.copy64(((SecT163FieldElement)p.getRawXCoord()).x, 0, table, pos); pos += FE_LONGS;
Nat192.copy64(((SecT163FieldElement)p.getRawYCoord()).x, 0, table, pos); pos += FE_LONGS;
}
}
return new ECLookupTable()
{
public int getSize()
{
return len;
}
public ECPoint lookup(int index)
{
long[] x = Nat192.create64(), y = Nat192.create64();
int pos = 0;
for (int i = 0; i < len; ++i)
{
long MASK = ((i ^ index) - 1) >> 31;
for (int j = 0; j < FE_LONGS; ++j)
{
x[j] ^= table[pos + j] & MASK;
y[j] ^= table[pos + FE_LONGS + j] & MASK;
}
pos += (FE_LONGS * 2);
}
return createRawPoint(new SecT163FieldElement(x), new SecT163FieldElement(y), false);
}
};
}
}
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