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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.bcpg;

import java.io.IOException;
import java.math.BigInteger;

/**
 * base class for an ElGamal Secret Key.
 */
public class ElGamalSecretBCPGKey 
    extends BCPGObject implements BCPGKey 
{
    MPInteger    x;
    
    /**
     * 
     * @param in
     * @throws IOException
     */
    public ElGamalSecretBCPGKey(
        BCPGInputStream    in)
        throws IOException
    {
        this.x = new MPInteger(in);
    }
    
    /**
     * 
     * @param x
     */
    public ElGamalSecretBCPGKey(
        BigInteger    x)
    {
        this.x = new MPInteger(x);
    }
    
    /**
     *  return "PGP"
     * 
     * @see org.bouncycastle.bcpg.BCPGKey#getFormat()
     */
    public String getFormat() 
    {
        return "PGP";
    }

    public BigInteger getX()
    {
        return x.getValue();
    }
    
    /**
     * return the standard PGP encoding of the key.
     * 
     * @see org.bouncycastle.bcpg.BCPGKey#getEncoded()
     */
    public byte[] getEncoded() 
    {
        try
        {
            return super.getEncoded();
        }
        catch (IOException e)
        {
            return null;
        }
    }
    
    public void encode(
        BCPGOutputStream    out)
        throws IOException
    {
        out.writeObject(x);
    }
}