package au.net.aba.crypto.provider;

/*
 * $Id: RSAPrivKey.java,v 1.6 1999/01/24 23:03:51 leachbj Exp $
 * $Author: leachbj $
 *
 * Copyright (C) 1996-1998 Australian Business Access Pty Ltd.
 * All rights reserved.
 * 
 * Use, modification, copying and distribution of this software is subject the
 * terms and conditions of the ABA Public Licence. See the file
 * "PUBLIC_LICENCE" for additional information.
 *
 * If you have not received a copy of the Public Licence, you must destroy all
 * copies of this file immediately. 
 *
 * $Source: /aba/CVSROOT/jdk1.1/src/au.net.aba/crypto/provider/RSAPrivKey.java,v $
 * $Revision: 1.6 $
 * $Date: 1999/01/24 23:03:51 $
 * $State: Exp $
 */

import java.math.BigInteger;
import java.security.interfaces.RSAPrivateKey;

/**
 * A class for ABA RSA private keys.
 */
public class RSAPrivKey implements RSAPrivateKey
{
	public final static String ident = "$Id: RSAPrivKey.java,v 1.6 1999/01/24 23:03:51 leachbj Exp $";

	//==================================
	// Protected Interface
	//==================================

	/**
	 * The modulus of this key.
	 */
	protected BigInteger modulus;

	/**
	 * The private exponent of this key.
	 */
	protected BigInteger d;
	/**
	 * Construct an empty RSAPrivKey.
	 */
	public RSAPrivKey()
	{
	}
	public RSAPrivKey(
		BigInteger modulus,
		BigInteger privateExponent)
	{
		this.modulus = modulus;
		this.d = privateExponent;
	}
	/**
	 * Return the algorithm for this key.
	 *
	 * @return the string RSA.
	 */
	public String getAlgorithm()
	{
		return "RSA";
	}
	/**
	 * Return an encoded representation for this key.  Returns a
	 * byte array that forms the string "modulus.exponent".
	 *
	 * @see #getFormat
	 * @see #toString
	 */
	public byte[] getEncoded()
	{
		return toString().getBytes();
	}
	/**
	 * Return the format this key is in.  This returns "ABA" which
	 * indicates the encoded key is the form of a byte array whose
	 * contents form the string "modulus.exponent" (ie the String
	 * returned from the <code>toString()</code> method.  This
	 * format is compatible with the AsciiEncodedKeySpec.
	 */
	public String getFormat()
	{
		return "ASCII";
	}
	//==================================
	// Public Interface
	//==================================

	/**
	 * Return the modulus.
	 *
	 * @return the modulus.
	 */
	public BigInteger getModulus()
	{
		return modulus;
	}
	/**
	 * Return the private exponent
	 *
	 * @return the private exponent.
	 */
	public BigInteger getPrivateExponent()
	{
		return d;
	}
	/**
	 * Generate a String representation of this key.
	 *
	 * @return		The key as a string.
	 */
	public String toString()
	{
		return modulus.toString(16) + "." + d.toString(16);
	}
}