package org.bouncycastle.jce.provider;
import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;
import org.bouncycastle.jce.spec.ECNamedCurveSpec;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECFieldElement;
import java.math.BigInteger;
import java.security.spec.ECField;
import java.security.spec.ECFieldF2m;
import java.security.spec.ECFieldFp;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.EllipticCurve;
public class EC5Util
{
static EllipticCurve convertCurve(
ECCurve curve,
byte[] seed)
{
if (curve instanceof ECCurve.Fp)
{
return new EllipticCurve(new ECFieldFp(((ECCurve.Fp)curve).getQ()), curve.getA().toBigInteger(), curve.getB().toBigInteger(), seed);
}
else
{
ECCurve.F2m curveF2m = (ECCurve.F2m)curve;
int ks[];
if (curveF2m.isTrinomial())
{
ks = new int[] { curveF2m.getK1() };
return new EllipticCurve(new ECFieldF2m(curveF2m.getM(), ks), curve.getA().toBigInteger(), curve.getB().toBigInteger(), seed);
}
else
{
ks = new int[] { curveF2m.getK3(), curveF2m.getK2(), curveF2m.getK1() };
return new EllipticCurve(new ECFieldF2m(curveF2m.getM(), ks), curve.getA().toBigInteger(), curve.getB().toBigInteger(), seed);
}
}
}
static ECParameterSpec convertSpec(
EllipticCurve ellipticCurve,
org.bouncycastle.jce.spec.ECParameterSpec spec)
{
if (spec instanceof ECNamedCurveParameterSpec)
{
return new ECNamedCurveSpec(
((ECNamedCurveParameterSpec)spec).getName(),
ellipticCurve,
new ECPoint(
spec.getG().getX().toBigInteger(),
spec.getG().getY().toBigInteger()),
spec.getN(),
spec.getH());
}
else
{
return new ECParameterSpec(
ellipticCurve,
new ECPoint(
spec.getG().getX().toBigInteger(),
spec.getG().getY().toBigInteger()),
spec.getN(),
spec.getH().intValue());
}
}
static org.bouncycastle.jce.spec.ECParameterSpec convertSpec(
ECParameterSpec ecSpec,
boolean withCompression)
{
ECCurve curve;
org.bouncycastle.math.ec.ECPoint ecPoint;
ECField field = ecSpec.getCurve().getField();
if (field instanceof ECFieldFp)
{
curve = new ECCurve.Fp(((ECFieldFp)ecSpec.getCurve().getField()).getP(), ecSpec.getCurve().getA(), ecSpec.getCurve().getB());
ecPoint = new org.bouncycastle.math.ec.ECPoint.Fp(curve, new ECFieldElement.Fp(((ECCurve.Fp)curve).getQ(), ecSpec.getGenerator().getAffineX()), new ECFieldElement.Fp(((ECCurve.Fp)curve).getQ(), ecSpec.getGenerator().getAffineY()), withCompression);
}
else
{
ECFieldF2m fieldF2m = (ECFieldF2m)field;
int m = fieldF2m.getM();
int ks[] = ECUtil.convertMidTerms(fieldF2m.getMidTermsOfReductionPolynomial());
curve = new ECCurve.F2m(m, ks[0], ks[1], ks[2], ecSpec.getCurve().getA(), ecSpec.getCurve().getB());
ecPoint = new org.bouncycastle.math.ec.ECPoint.F2m(curve, new ECFieldElement.F2m(m, ks[0], ks[1], ks[2], ecSpec.getGenerator().getAffineX()), new ECFieldElement.F2m(m, ks[0], ks[1], ks[2], ecSpec.getGenerator().getAffineY()), withCompression);
}
return new org.bouncycastle.jce.spec.ECParameterSpec(
curve,
ecPoint,
ecSpec.getOrder(),
BigInteger.valueOf(ecSpec.getCofactor()),
ecSpec.getCurve().getSeed());
}
}