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package org.bouncycastle.jcajce.provider.asymmetric.elgamal;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.util.Enumeration;
import javax.crypto.interfaces.DHPrivateKey;
import javax.crypto.spec.DHParameterSpec;
import javax.crypto.spec.DHPrivateKeySpec;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.oiw.ElGamalParameter;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.params.ElGamalPrivateKeyParameters;
import org.bouncycastle.jcajce.provider.asymmetric.util.PKCS12BagAttributeCarrierImpl;
import org.bouncycastle.jce.interfaces.ElGamalPrivateKey;
import org.bouncycastle.jce.interfaces.PKCS12BagAttributeCarrier;
import org.bouncycastle.jce.spec.ElGamalParameterSpec;
import org.bouncycastle.jce.spec.ElGamalPrivateKeySpec;
public class BCElGamalPrivateKey
implements ElGamalPrivateKey, DHPrivateKey, PKCS12BagAttributeCarrier
{
static final long serialVersionUID = 4819350091141529678L;
private BigInteger x;
private transient ElGamalParameterSpec elSpec;
private transient PKCS12BagAttributeCarrierImpl attrCarrier = new PKCS12BagAttributeCarrierImpl();
protected BCElGamalPrivateKey()
{
}
BCElGamalPrivateKey(
ElGamalPrivateKey key)
{
this.x = key.getX();
this.elSpec = key.getParameters();
}
BCElGamalPrivateKey(
DHPrivateKey key)
{
this.x = key.getX();
this.elSpec = new ElGamalParameterSpec(key.getParams().getP(), key.getParams().getG());
}
BCElGamalPrivateKey(
ElGamalPrivateKeySpec spec)
{
this.x = spec.getX();
this.elSpec = new ElGamalParameterSpec(spec.getParams().getP(), spec.getParams().getG());
}
BCElGamalPrivateKey(
DHPrivateKeySpec spec)
{
this.x = spec.getX();
this.elSpec = new ElGamalParameterSpec(spec.getP(), spec.getG());
}
BCElGamalPrivateKey(
PrivateKeyInfo info)
throws IOException
{
ElGamalParameter params = ElGamalParameter.getInstance(info.getPrivateKeyAlgorithm().getParameters());
ASN1Integer derX = ASN1Integer.getInstance(info.parsePrivateKey());
this.x = derX.getValue();
this.elSpec = new ElGamalParameterSpec(params.getP(), params.getG());
}
BCElGamalPrivateKey(
ElGamalPrivateKeyParameters params)
{
this.x = params.getX();
this.elSpec = new ElGamalParameterSpec(params.getParameters().getP(), params.getParameters().getG());
}
public String getAlgorithm()
{
return "ElGamal";
}
/**
* return the encoding format we produce in getEncoded().
*
* @return the string "PKCS#8"
*/
public String getFormat()
{
return "PKCS#8";
}
/**
* 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()
{
try
{
PrivateKeyInfo info = new PrivateKeyInfo(new AlgorithmIdentifier(OIWObjectIdentifiers.elGamalAlgorithm, new ElGamalParameter(elSpec.getP(), elSpec.getG())), new ASN1Integer(getX()));
return info.getEncoded(ASN1Encoding.DER);
}
catch (IOException e)
{
return null;
}
}
public ElGamalParameterSpec getParameters()
{
return elSpec;
}
public DHParameterSpec getParams()
{
return new DHParameterSpec(elSpec.getP(), elSpec.getG());
}
public BigInteger getX()
{
return x;
}
public boolean equals(
Object o)
{
if (!(o instanceof DHPrivateKey))
{
return false;
}
DHPrivateKey other = (DHPrivateKey)o;
return this.getX().equals(other.getX())
&& this.getParams().getG().equals(other.getParams().getG())
&& this.getParams().getP().equals(other.getParams().getP())
&& this.getParams().getL() == other.getParams().getL();
}
public int hashCode()
{
return this.getX().hashCode() ^ this.getParams().getG().hashCode()
^ this.getParams().getP().hashCode() ^ this.getParams().getL();
}
private void readObject(
ObjectInputStream in)
throws IOException, ClassNotFoundException
{
in.defaultReadObject();
this.elSpec = new ElGamalParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject());
this.attrCarrier = new PKCS12BagAttributeCarrierImpl();
}
private void writeObject(
ObjectOutputStream out)
throws IOException
{
out.defaultWriteObject();
out.writeObject(elSpec.getP());
out.writeObject(elSpec.getG());
}
public void setBagAttribute(
ASN1ObjectIdentifier oid,
ASN1Encodable attribute)
{
attrCarrier.setBagAttribute(oid, attribute);
}
public ASN1Encodable getBagAttribute(
ASN1ObjectIdentifier oid)
{
return attrCarrier.getBagAttribute(oid);
}
public Enumeration getBagAttributeKeys()
{
return attrCarrier.getBagAttributeKeys();
}
}
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