com.cubusmail.server.mail.security.MailPasswordEncryptor.java Source code

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Here is the source code for com.cubusmail.server.mail.security.MailPasswordEncryptor.java

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/* MailPasswordEncryptor.java
    
   Copyright (c) 2009 Juergen Schlierf, All Rights Reserved
       
   This file is part of Cubusmail (http://code.google.com/p/cubusmail/).
       
   This library 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.
       
   This library 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
   Lesser General Public License for more details.
       
   You should have received a copy of the GNU Lesser General Public
   License along with Cubusmail. If not, see <http://www.gnu.org/licenses/>.
       
 */
package com.cubusmail.server.mail.security;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Encrypt und decrypt and passwords for mailboxes.
 * 
 * @author Juergen Schlierf
 */
public class MailPasswordEncryptor implements IMailPasswordEncryptor {

    private final Log log = LogFactory.getLog(getClass());

    private String algorithm;

    private KeyPair keyPair;

    /**
     * 
     */
    public void init() {

        try {
            this.keyPair = KeyPairGenerator.getInstance(this.algorithm).generateKeyPair();
        } catch (NoSuchAlgorithmException e) {
            log.error(e.getMessage(), e);
            throw new IllegalStateException(e.getMessage(), e);
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * com.cubusmail.mail.security.IMailPasswordEncryptor#encryptPassowrd(java
     * .lang.String)
     */
    public byte[] encryptPassowrd(String password) {

        Cipher cipher;
        try {
            cipher = Cipher.getInstance(this.algorithm);
            cipher.init(Cipher.ENCRYPT_MODE, this.keyPair.getPublic());

            ByteArrayOutputStream baosEncryptedData = new ByteArrayOutputStream();
            CipherOutputStream cos = new CipherOutputStream(baosEncryptedData, cipher);

            cos.write(password.getBytes("UTF-8"));
            cos.flush();
            cos.close();

            return baosEncryptedData.toByteArray();
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            throw new IllegalStateException(e.getMessage(), e);
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * com.cubusmail.mail.security.IMailPasswordEncryptor#decryptPassword(byte
     * [])
     */
    public String decryptPassword(byte[] encryptedPassword) {

        Cipher cipher;
        try {
            log.debug("decrypt...");
            cipher = Cipher.getInstance(this.algorithm);
            cipher.init(Cipher.DECRYPT_MODE, this.keyPair.getPrivate());

            CipherInputStream cis = new CipherInputStream(new ByteArrayInputStream(encryptedPassword), cipher);
            ByteArrayOutputStream baosDecryptedData = new ByteArrayOutputStream();
            byte[] buffer = new byte[8192];
            int len = 0;
            while ((len = cis.read(buffer)) > 0) {
                baosDecryptedData.write(buffer, 0, len);
            }
            baosDecryptedData.flush();
            cis.close();

            log.debug("...finish");

            return new String(baosDecryptedData.toByteArray());
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            throw new IllegalStateException(e.getMessage(), e);
        }
    }

    /**
     * @param keyPair
     *            The keyPair to set.
     */
    public void setKeyPair(KeyPair keyPair) {

        this.keyPair = keyPair;
    }

    /**
     * @param algorithm
     *            The algorithm to set.
     */
    public void setAlgorithm(String algorithm) {

        this.algorithm = algorithm;
    }
}