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package org.spongycastle.crypto.util;
import java.io.IOException;
import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1Integer;
import org.spongycastle.asn1.DERNull;
import org.spongycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.spongycastle.asn1.pkcs.PrivateKeyInfo;
import org.spongycastle.asn1.pkcs.RSAPrivateKey;
import org.spongycastle.asn1.sec.ECPrivateKey;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.asn1.x509.DSAParameter;
import org.spongycastle.asn1.x9.X962Parameters;
import org.spongycastle.asn1.x9.X9ECParameters;
import org.spongycastle.asn1.x9.X9ObjectIdentifiers;
import org.spongycastle.crypto.params.AsymmetricKeyParameter;
import org.spongycastle.crypto.params.DSAParameters;
import org.spongycastle.crypto.params.DSAPrivateKeyParameters;
import org.spongycastle.crypto.params.ECDomainParameters;
import org.spongycastle.crypto.params.ECNamedDomainParameters;
import org.spongycastle.crypto.params.ECPrivateKeyParameters;
import org.spongycastle.crypto.params.RSAKeyParameters;
import org.spongycastle.crypto.params.RSAPrivateCrtKeyParameters;
/**
* Factory to create ASN.1 private key info objects from lightweight private keys.
*/
public class PrivateKeyInfoFactory
{
/**
* Create a PrivateKeyInfo representation of a private key.
*
* @param privateKey the SubjectPublicKeyInfo encoding
* @return the appropriate key parameter
* @throws java.io.IOException on an error encoding the key
*/
public static PrivateKeyInfo createPrivateKeyInfo(AsymmetricKeyParameter privateKey) throws IOException
{
if (privateKey instanceof RSAKeyParameters)
{
RSAPrivateCrtKeyParameters priv = (RSAPrivateCrtKeyParameters)privateKey;
return new PrivateKeyInfo(new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, DERNull.INSTANCE), new RSAPrivateKey(priv.getModulus(), priv.getPublicExponent(), priv.getExponent(), priv.getP(), priv.getQ(), priv.getDP(), priv.getDQ(), priv.getQInv()));
}
else if (privateKey instanceof DSAPrivateKeyParameters)
{
DSAPrivateKeyParameters priv = (DSAPrivateKeyParameters)privateKey;
DSAParameters params = priv.getParameters();
return new PrivateKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa, new DSAParameter(params.getP(), params.getQ(), params.getG())), new ASN1Integer(priv.getX()));
}
else if (privateKey instanceof ECPrivateKeyParameters)
{
ECPrivateKeyParameters priv = (ECPrivateKeyParameters)privateKey;
ECDomainParameters domainParams = priv.getParameters();
ASN1Encodable params;
if (domainParams == null)
{
params = new X962Parameters(DERNull.INSTANCE); // Implicitly CA
}
else if (domainParams instanceof ECNamedDomainParameters)
{
params = new X962Parameters(((ECNamedDomainParameters)domainParams).getName());
}
else
{
X9ECParameters ecP = new X9ECParameters(
domainParams.getCurve(),
domainParams.getG(),
domainParams.getN(),
domainParams.getH(),
domainParams.getSeed());
params = new X962Parameters(ecP);
}
return new PrivateKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, params), new ECPrivateKey(priv.getD(), params));
}
else
{
throw new IOException("key parameters not recognised.");
}
}
}
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