/*

 * This program is free software: you can redistribute it and/or modify it under

 * the terms of the GNU General Public License as published by the Free Software

 * Foundation, either version 3 of the License, or (at your option) any later

 * version.

 * 

 * This program 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

 * this program. If not, see <http://www.gnu.org/licenses/>.

 */

package net.l2emuproject.loginserver.network.gameserverpackets;



import java.security.GeneralSecurityException;

import java.security.interfaces.RSAPrivateKey;



import javax.crypto.Cipher;



/**

 * @author -Wooden-

 */

public final class BlowFishKey extends GameToLoginPacket

{

	private byte[]	_key;



	public BlowFishKey(byte[] decrypt, RSAPrivateKey privateKey)

	{

		super(decrypt);

		final int size = readD();

		final byte[] tempKey = readB(size);

		try

		{

			byte[] tempDecryptKey;

			final Cipher rsaCipher = Cipher.getInstance("RSA/ECB/nopadding");

			rsaCipher.init(Cipher.DECRYPT_MODE, privateKey);

			tempDecryptKey = rsaCipher.doFinal(tempKey);

			// there are nulls before the key we must remove them

			int i = 0;

			final int len = tempDecryptKey.length;

			for (; i < len; i++)

				if (tempDecryptKey[i] != 0)

					break;

			_key = new byte[len - i];

			System.arraycopy(tempDecryptKey, i, _key, 0, len - i);

		}

		catch (final GeneralSecurityException e)

		{

			_log.fatal("Error While decrypting blowfish key (RSA)", e);

		}

	}



	public byte[] getKey()

	{

		return _key;

	}

}