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/**
 * Copyright 2003-2016 SSHTOOLS Limited. All Rights Reserved.
 *
 * For product documentation visit https://www.sshtools.com/
 *
 * This file is part of J2SSH Maverick.
 *
 * J2SSH Maverick is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * J2SSH Maverick is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with J2SSH Maverick.  If not, see .
 */
package com.sshtools.publickey;

import java.io.IOException;

import com.sshtools.ssh.components.SshKeyPair;

/**
 * Interface which all private key formats must implement to provide decoding
 * and decryption of the private key into a suitable format for the API.
 * 
 * @author Lee David Painter
 */
public interface SshPrivateKeyFile {

	/**
	 * Determine if the private key file is protected by a passphrase.
	 * 
	 * @return true if the key file is encrypted with a passphrase,
	 *         otherwise false
	 * @throws IOException
	 */
	public boolean isPassphraseProtected();

	/**
	 * Decode the private key using the users passphrase.
	 * 
	 * @param passphrase
	 *            the users passphrase
	 * @return the key pair stored in this private key file.
	 * @throws IOException
	 * @throws InvalidPassphraseException
	 */
	public SshKeyPair toKeyPair(String passphrase) throws IOException,
			InvalidPassphraseException;

	/**
	 * Method to determine whether the format supports changing of passphrases.
	 * This typically would indicate that the format is read-only and that keys
	 * cannot be saved into this format.
	 * 
	 * @return boolean
	 */
	public boolean supportsPassphraseChange();

	/**
	 * Get a description of the format type e.g. "OpenSSH"
	 * 
	 * @return String
	 */
	public String getType();

	/**
	 * Change the passphrase of the key file.
	 * 
	 * @param oldpassphrase
	 *            the old passphrase
	 * @param newpassprase
	 *            the new passphrase
	 * @throws IOException
	 * @throws InvalidPassphraseException
	 */
	public void changePassphrase(String oldpassphrase, String newpassprase)
			throws IOException, InvalidPassphraseException;

	/**
	 * Get the formatted key
	 * 
	 * @return byte[]
	 * @throws IOException
	 */
	public byte[] getFormattedKey() throws IOException;
}