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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 a DSA Secret Key.
 */
public class DSASecretBCPGKey 
    extends BCPGObject implements BCPGKey 
{
    MPInteger    x;
    
    /**
     * 
     * @param in
     * @throws IOException
     */
    public DSASecretBCPGKey(
        BCPGInputStream    in)
        throws IOException
    {
        this.x = new MPInteger(in);
    }

    /**
     * 
     * @param x
     */
    public DSASecretBCPGKey(
        BigInteger    x)
    {
        this.x = new MPInteger(x);
    }
    
    /**
     *  return "PGP"
     * 
     * @see org.bouncycastle.bcpg.BCPGKey#getFormat()
     */
    public String getFormat() 
    {
        return "PGP";
    }

    /**
     * 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);
    }
    
    /**
     * @return x
     */
    public BigInteger getX()
    {
        return x.getValue();
    }
}