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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar
contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one
provided with the Bouncy Castle Cryptography APIs.
package org.bouncycastle.jce.provider;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import javax.crypto.interfaces.DHPublicKey;
import javax.crypto.spec.DHParameterSpec;
import javax.crypto.spec.DHPublicKeySpec;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.oiw.ElGamalParameter;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.crypto.params.ElGamalPublicKeyParameters;
import org.bouncycastle.jcajce.provider.asymmetric.util.KeyUtil;
import org.bouncycastle.jce.interfaces.ElGamalPublicKey;
import org.bouncycastle.jce.spec.ElGamalParameterSpec;
import org.bouncycastle.jce.spec.ElGamalPublicKeySpec;
public class JCEElGamalPublicKey
implements ElGamalPublicKey, DHPublicKey
{
static final long serialVersionUID = 8712728417091216948L;
private BigInteger y;
private ElGamalParameterSpec elSpec;
JCEElGamalPublicKey(
ElGamalPublicKeySpec spec)
{
this.y = spec.getY();
this.elSpec = new ElGamalParameterSpec(spec.getParams().getP(), spec.getParams().getG());
}
JCEElGamalPublicKey(
DHPublicKeySpec spec)
{
this.y = spec.getY();
this.elSpec = new ElGamalParameterSpec(spec.getP(), spec.getG());
}
JCEElGamalPublicKey(
ElGamalPublicKey key)
{
this.y = key.getY();
this.elSpec = key.getParameters();
}
JCEElGamalPublicKey(
DHPublicKey key)
{
this.y = key.getY();
this.elSpec = new ElGamalParameterSpec(key.getParams().getP(), key.getParams().getG());
}
JCEElGamalPublicKey(
ElGamalPublicKeyParameters params)
{
this.y = params.getY();
this.elSpec = new ElGamalParameterSpec(params.getParameters().getP(), params.getParameters().getG());
}
JCEElGamalPublicKey(
BigInteger y,
ElGamalParameterSpec elSpec)
{
this.y = y;
this.elSpec = elSpec;
}
JCEElGamalPublicKey(
SubjectPublicKeyInfo info)
{
ElGamalParameter params = ElGamalParameter.getInstance(info.getAlgorithm().getParameters());
ASN1Integer derY = null;
try
{
derY = (ASN1Integer)info.parsePublicKey();
}
catch (IOException e)
{
throw new IllegalArgumentException("invalid info structure in DSA public key");
}
this.y = derY.getValue();
this.elSpec = new ElGamalParameterSpec(params.getP(), params.getG());
}
public String getAlgorithm()
{
return "ElGamal";
}
public String getFormat()
{
return "X.509";
}
public byte[] getEncoded()
{
return KeyUtil.getEncodedSubjectPublicKeyInfo(new AlgorithmIdentifier(OIWObjectIdentifiers.elGamalAlgorithm, new ElGamalParameter(elSpec.getP(), elSpec.getG())), new ASN1Integer(y));
}
public ElGamalParameterSpec getParameters()
{
return elSpec;
}
public DHParameterSpec getParams()
{
return new DHParameterSpec(elSpec.getP(), elSpec.getG());
}
public BigInteger getY()
{
return y;
}
private void readObject(
ObjectInputStream in)
throws IOException, ClassNotFoundException
{
this.y = (BigInteger)in.readObject();
this.elSpec = new ElGamalParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject());
}
private void writeObject(
ObjectOutputStream out)
throws IOException
{
out.writeObject(this.getY());
out.writeObject(elSpec.getP());
out.writeObject(elSpec.getG());
}
}