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Viewing changes to src/org/bouncycastle/jce/provider/ElGamalUtil.java

  • Committer: Brian Thomason
  • Date: 2011-12-20 17:20:32 UTC
  • Revision ID: brian.thomason@canonical.com-20111220172032-rdtm13jgdxtksacr
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src/org/bouncycastle/jce/provider/ElGamalUtil.java
 
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package org.bouncycastle.jce.provider;
 
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import java.security.InvalidKeyException;
 
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import java.security.PrivateKey;
 
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import java.security.PublicKey;
 
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import javax.crypto.interfaces.DHPrivateKey;
 
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import javax.crypto.interfaces.DHPublicKey;
 
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import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
 
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import org.bouncycastle.crypto.params.ElGamalParameters;
 
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import org.bouncycastle.crypto.params.ElGamalPrivateKeyParameters;
 
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import org.bouncycastle.crypto.params.ElGamalPublicKeyParameters;
 
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import org.bouncycastle.jce.interfaces.ElGamalPrivateKey;
 
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import org.bouncycastle.jce.interfaces.ElGamalPublicKey;
 
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/**
 
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 * utility class for converting jce/jca ElGamal objects
 
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 * objects into their org.bouncycastle.crypto counterparts.
 
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 */
 
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public class ElGamalUtil
 
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{
 
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    static public AsymmetricKeyParameter generatePublicKeyParameter(
 
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        PublicKey    key)
 
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        throws InvalidKeyException
 
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    {
 
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        if (key instanceof ElGamalPublicKey)
 
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        {
 
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            ElGamalPublicKey    k = (ElGamalPublicKey)key;
 
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            return new ElGamalPublicKeyParameters(k.getY(),
 
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                new ElGamalParameters(k.getParameters().getP(), k.getParameters().getG()));
 
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        }
 
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        else if (key instanceof DHPublicKey)
 
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        {
 
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            DHPublicKey    k = (DHPublicKey)key;
 
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            return new ElGamalPublicKeyParameters(k.getY(),
 
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                new ElGamalParameters(k.getParams().getP(), k.getParams().getG()));
 
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        }
 
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        throw new InvalidKeyException("can't identify public key for El Gamal.");
 
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    }
 
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    static public AsymmetricKeyParameter generatePrivateKeyParameter(
 
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        PrivateKey    key)
 
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        throws InvalidKeyException
 
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    {
 
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        if (key instanceof ElGamalPrivateKey)
 
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        {
 
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            ElGamalPrivateKey    k = (ElGamalPrivateKey)key;
 
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            return new ElGamalPrivateKeyParameters(k.getX(),
 
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                new ElGamalParameters(k.getParameters().getP(), k.getParameters().getG()));
 
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        }
 
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        else if (key instanceof DHPrivateKey)
 
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        {
 
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            DHPrivateKey    k = (DHPrivateKey)key;
 
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            return new ElGamalPrivateKeyParameters(k.getX(),
 
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                new ElGamalParameters(k.getParams().getP(), k.getParams().getG()));
 
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        }
 
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        throw new InvalidKeyException("can't identify private key for El Gamal.");
 
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    }
 
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}