private void populateFromPrivKeyInfo(PrivateKeyInfo info) {
X962Parameters params = new X962Parameters((DERObject) info.getAlgorithmId().getParameters());
if (params.isNamedCurve()) {
DERObjectIdentifier oid = (DERObjectIdentifier) params.getParameters();
X9ECParameters ecP = ECUtil.getNamedCurveByOid(oid);
if (ecP == null) // GOST Curve
{
ECDomainParameters gParam = ECGOST3410NamedCurves.getByOID(oid);
EllipticCurve ellipticCurve = EC5Util.convertCurve(gParam.getCurve(), gParam.getSeed());
ecSpec =
new ECNamedCurveSpec(
ECGOST3410NamedCurves.getName(oid),
ellipticCurve,
new ECPoint(
gParam.getG().getX().toBigInteger(), gParam.getG().getY().toBigInteger()),
gParam.getN(),
gParam.getH());
} else {
EllipticCurve ellipticCurve = EC5Util.convertCurve(ecP.getCurve(), ecP.getSeed());
ecSpec =
new ECNamedCurveSpec(
ECUtil.getCurveName(oid),
ellipticCurve,
new ECPoint(ecP.getG().getX().toBigInteger(), ecP.getG().getY().toBigInteger()),
ecP.getN(),
ecP.getH());
}
} else if (params.isImplicitlyCA()) {
ecSpec = null;
} else {
X9ECParameters ecP = new X9ECParameters((ASN1Sequence) params.getParameters());
EllipticCurve ellipticCurve = EC5Util.convertCurve(ecP.getCurve(), ecP.getSeed());
this.ecSpec =
new ECParameterSpec(
ellipticCurve,
new ECPoint(ecP.getG().getX().toBigInteger(), ecP.getG().getY().toBigInteger()),
ecP.getN(),
ecP.getH().intValue());
}
if (info.getPrivateKey() instanceof DERInteger) {
DERInteger derD = (DERInteger) info.getPrivateKey();
this.d = derD.getValue();
} else {
ECPrivateKeyStructure ec = new ECPrivateKeyStructure((ASN1Sequence) info.getPrivateKey());
this.d = ec.getKey();
this.publicKey = ec.getPublicKey();
}
}
/**
* Return a PKCS8 representation of the key. The sequence returned represents a full
* PrivateKeyInfo object.
*
* @return a PKCS8 representation of the key.
*/
public byte[] getEncoded() {
X962Parameters params;
if (ecSpec instanceof ECNamedCurveSpec) {
DERObjectIdentifier curveOid = ECUtil.getNamedCurveOid(((ECNamedCurveSpec) ecSpec).getName());
if (curveOid == null) // guess it's the OID
{
curveOid = new DERObjectIdentifier(((ECNamedCurveSpec) ecSpec).getName());
}
params = new X962Parameters(curveOid);
} else if (ecSpec == null) {
params = new X962Parameters(DERNull.INSTANCE);
} else {
ECCurve curve = EC5Util.convertCurve(ecSpec.getCurve());
X9ECParameters ecP =
new X9ECParameters(
curve,
EC5Util.convertPoint(curve, ecSpec.getGenerator(), withCompression),
ecSpec.getOrder(),
BigInteger.valueOf(ecSpec.getCofactor()),
ecSpec.getCurve().getSeed());
params = new X962Parameters(ecP);
}
PrivateKeyInfo info;
ECPrivateKeyStructure keyStructure;
if (publicKey != null) {
keyStructure = new ECPrivateKeyStructure(this.getS(), publicKey, params);
} else {
keyStructure = new ECPrivateKeyStructure(this.getS(), params);
}
if (algorithm.equals("ECGOST3410")) {
info =
new PrivateKeyInfo(
new AlgorithmIdentifier(
CryptoProObjectIdentifiers.gostR3410_2001, params.getDERObject()),
keyStructure.getDERObject());
} else {
info =
new PrivateKeyInfo(
new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, params.getDERObject()),
keyStructure.getDERObject());
}
return info.getDEREncoded();
}