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The Bouncy Castle Java API for handling the OpenPGP protocol. This jar contains the OpenPGP API for JDK 1.5 to JDK 1.7. 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.openpgp.operator.jcajce;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.PublicKey;
import java.security.interfaces.DSAParams;
import java.security.interfaces.DSAPrivateKey;
import java.security.interfaces.DSAPublicKey;
import java.security.interfaces.RSAPrivateCrtKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.DSAPrivateKeySpec;
import java.security.spec.DSAPublicKeySpec;
import java.security.spec.RSAPrivateCrtKeySpec;
import java.security.spec.RSAPublicKeySpec;
import java.util.Date;
import org.bouncycastle.bcpg.BCPGKey;
import org.bouncycastle.bcpg.DSAPublicBCPGKey;
import org.bouncycastle.bcpg.DSASecretBCPGKey;
import org.bouncycastle.bcpg.ElGamalPublicBCPGKey;
import org.bouncycastle.bcpg.ElGamalSecretBCPGKey;
import org.bouncycastle.bcpg.PublicKeyAlgorithmTags;
import org.bouncycastle.bcpg.PublicKeyPacket;
import org.bouncycastle.bcpg.RSAPublicBCPGKey;
import org.bouncycastle.bcpg.RSASecretBCPGKey;
import org.bouncycastle.jcajce.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.NamedJcaJceHelper;
import org.bouncycastle.jcajce.ProviderJcaJceHelper;
import org.bouncycastle.jce.interfaces.ElGamalPrivateKey;
import org.bouncycastle.jce.interfaces.ElGamalPublicKey;
import org.bouncycastle.jce.spec.ElGamalParameterSpec;
import org.bouncycastle.jce.spec.ElGamalPrivateKeySpec;
import org.bouncycastle.jce.spec.ElGamalPublicKeySpec;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPPrivateKey;
import org.bouncycastle.openpgp.PGPPublicKey;
import org.bouncycastle.openpgp.operator.KeyFingerPrintCalculator;
public class JcaPGPKeyConverter
{
private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
private KeyFingerPrintCalculator fingerPrintCalculator = new JcaKeyFingerprintCalculator();
public JcaPGPKeyConverter setProvider(Provider provider)
{
this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));
return this;
}
public JcaPGPKeyConverter setProvider(String providerName)
{
this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));
return this;
}
public PublicKey getPublicKey(PGPPublicKey publicKey)
throws PGPException
{
KeyFactory fact;
PublicKeyPacket publicPk = publicKey.getPublicKeyPacket();
try
{
switch (publicPk.getAlgorithm())
{
case PublicKeyAlgorithmTags.RSA_ENCRYPT:
case PublicKeyAlgorithmTags.RSA_GENERAL:
case PublicKeyAlgorithmTags.RSA_SIGN:
RSAPublicBCPGKey rsaK = (RSAPublicBCPGKey)publicPk.getKey();
RSAPublicKeySpec rsaSpec = new RSAPublicKeySpec(rsaK.getModulus(), rsaK.getPublicExponent());
fact = helper.createKeyFactory("RSA");
return fact.generatePublic(rsaSpec);
case PublicKeyAlgorithmTags.DSA:
DSAPublicBCPGKey dsaK = (DSAPublicBCPGKey)publicPk.getKey();
DSAPublicKeySpec dsaSpec = new DSAPublicKeySpec(dsaK.getY(), dsaK.getP(), dsaK.getQ(), dsaK.getG());
fact = helper.createKeyFactory("DSA");
return fact.generatePublic(dsaSpec);
case PublicKeyAlgorithmTags.ELGAMAL_ENCRYPT:
case PublicKeyAlgorithmTags.ELGAMAL_GENERAL:
ElGamalPublicBCPGKey elK = (ElGamalPublicBCPGKey)publicPk.getKey();
ElGamalPublicKeySpec elSpec = new ElGamalPublicKeySpec(elK.getY(), new ElGamalParameterSpec(elK.getP(), elK.getG()));
fact = helper.createKeyFactory("ElGamal");
return fact.generatePublic(elSpec);
default:
throw new PGPException("unknown public key algorithm encountered");
}
}
catch (PGPException e)
{
throw e;
}
catch (Exception e)
{
throw new PGPException("exception constructing public key", e);
}
}
/**
* Create a PGPPublicKey from the passed in JCA one.
*
* Note: the time passed in affects the value of the key's keyID, so you probably only want
* to do this once for a JCA key, or make sure you keep track of the time you used.
*
* @param algorithm asymmetric algorithm type representing the public key.
* @param pubKey actual public key to associate.
* @param time date of creation.
* @throws PGPException on key creation problem.
*/
public PGPPublicKey getPGPPublicKey(int algorithm, PublicKey pubKey, Date time)
throws PGPException
{
BCPGKey bcpgKey;
if (pubKey instanceof RSAPublicKey)
{
RSAPublicKey rK = (RSAPublicKey)pubKey;
bcpgKey = new RSAPublicBCPGKey(rK.getModulus(), rK.getPublicExponent());
}
else if (pubKey instanceof DSAPublicKey)
{
DSAPublicKey dK = (DSAPublicKey)pubKey;
DSAParams dP = dK.getParams();
bcpgKey = new DSAPublicBCPGKey(dP.getP(), dP.getQ(), dP.getG(), dK.getY());
}
else if (pubKey instanceof ElGamalPublicKey)
{
ElGamalPublicKey eK = (ElGamalPublicKey)pubKey;
ElGamalParameterSpec eS = eK.getParameters();
bcpgKey = new ElGamalPublicBCPGKey(eS.getP(), eS.getG(), eK.getY());
}
else
{
throw new PGPException("unknown key class");
}
return new PGPPublicKey(new PublicKeyPacket(algorithm, time, bcpgKey), fingerPrintCalculator);
}
public PrivateKey getPrivateKey(PGPPrivateKey privKey)
throws PGPException
{
if (privKey instanceof JcaPGPPrivateKey)
{
return ((JcaPGPPrivateKey)privKey).getPrivateKey();
}
PublicKeyPacket pubPk = privKey.getPublicKeyPacket();
BCPGKey privPk = privKey.getPrivateKeyDataPacket();
try
{
KeyFactory fact;
switch (pubPk.getAlgorithm())
{
case PGPPublicKey.RSA_ENCRYPT:
case PGPPublicKey.RSA_GENERAL:
case PGPPublicKey.RSA_SIGN:
RSAPublicBCPGKey rsaPub = (RSAPublicBCPGKey)pubPk.getKey();
RSASecretBCPGKey rsaPriv = (RSASecretBCPGKey)privPk;
RSAPrivateCrtKeySpec rsaPrivSpec = new RSAPrivateCrtKeySpec(
rsaPriv.getModulus(),
rsaPub.getPublicExponent(),
rsaPriv.getPrivateExponent(),
rsaPriv.getPrimeP(),
rsaPriv.getPrimeQ(),
rsaPriv.getPrimeExponentP(),
rsaPriv.getPrimeExponentQ(),
rsaPriv.getCrtCoefficient());
fact = helper.createKeyFactory("RSA");
return fact.generatePrivate(rsaPrivSpec);
case PGPPublicKey.DSA:
DSAPublicBCPGKey dsaPub = (DSAPublicBCPGKey)pubPk.getKey();
DSASecretBCPGKey dsaPriv = (DSASecretBCPGKey)privPk;
DSAPrivateKeySpec dsaPrivSpec =
new DSAPrivateKeySpec(dsaPriv.getX(), dsaPub.getP(), dsaPub.getQ(), dsaPub.getG());
fact = helper.createKeyFactory("DSA");
return fact.generatePrivate(dsaPrivSpec);
case PGPPublicKey.ELGAMAL_ENCRYPT:
case PGPPublicKey.ELGAMAL_GENERAL:
ElGamalPublicBCPGKey elPub = (ElGamalPublicBCPGKey)pubPk.getKey();
ElGamalSecretBCPGKey elPriv = (ElGamalSecretBCPGKey)privPk;
ElGamalPrivateKeySpec elSpec = new ElGamalPrivateKeySpec(elPriv.getX(), new ElGamalParameterSpec(elPub.getP(), elPub.getG()));
fact = helper.createKeyFactory("ElGamal");
return fact.generatePrivate(elSpec);
default:
throw new PGPException("unknown public key algorithm encountered");
}
}
catch (PGPException e)
{
throw e;
}
catch (Exception e)
{
throw new PGPException("Exception constructing key", e);
}
}
/**
* Convert a PrivateKey into a PGPPrivateKey.
*
* @param pub the corresponding PGPPublicKey to privKey.
* @param privKey the private key for the key in pub.
* @return a PGPPrivateKey
* @throws PGPException
*/
public PGPPrivateKey getPGPPrivateKey(PGPPublicKey pub, PrivateKey privKey)
throws PGPException
{
BCPGKey privPk;
switch (pub.getAlgorithm())
{
case PGPPublicKey.RSA_ENCRYPT:
case PGPPublicKey.RSA_SIGN:
case PGPPublicKey.RSA_GENERAL:
RSAPrivateCrtKey rsK = (RSAPrivateCrtKey)privKey;
privPk = new RSASecretBCPGKey(rsK.getPrivateExponent(), rsK.getPrimeP(), rsK.getPrimeQ());
break;
case PGPPublicKey.DSA:
DSAPrivateKey dsK = (DSAPrivateKey)privKey;
privPk = new DSASecretBCPGKey(dsK.getX());
break;
case PGPPublicKey.ELGAMAL_ENCRYPT:
case PGPPublicKey.ELGAMAL_GENERAL:
ElGamalPrivateKey esK = (ElGamalPrivateKey)privKey;
privPk = new ElGamalSecretBCPGKey(esK.getX());
break;
default:
throw new PGPException("unknown key class");
}
return new PGPPrivateKey(pub.getKeyID(), pub.getPublicKeyPacket(), privPk);
}
}