com.commander4j.util.JCipher.java Source code

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Here is the source code for com.commander4j.util.JCipher.java

Source

package com.commander4j.util;

/**
 * @author David Garratt
 * 
 * Project Name : Commander4j
 * 
 * Filename     : JCipher.java
 * 
 * Package Name : com.commander4j.util
 * 
 * License      : GNU General Public License
 * 
 * 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.commander4j.com/website/license.html.
 * 
 */

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class JCipher {
    private String encryptionKey;

    public JCipher(String encryptionKey) {
        this.encryptionKey = encryptionKey;
    }

    public String encrypt(String plainText) throws Exception {
        Cipher cipher = getCipher(Cipher.ENCRYPT_MODE);
        byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());

        return Base64.encodeBase64String(encryptedBytes);
    }

    public String decrypt(String encrypted) throws Exception {
        Cipher cipher = getCipher(Cipher.DECRYPT_MODE);
        byte[] plainBytes = cipher.doFinal(Base64.decodeBase64(encrypted));

        return new String(plainBytes);
    }

    private Cipher getCipher(int cipherMode) throws Exception {
        String encryptionAlgorithm = "AES";
        SecretKeySpec keySpecification = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), encryptionAlgorithm);
        Cipher cipher = Cipher.getInstance(encryptionAlgorithm);
        cipher.init(cipherMode, keySpecification);

        return cipher;
    }

    public String encode(String value) {
        String result = "";

        try {
            result = encrypt(value);
        } catch (Exception ex) {
            result = "";
        }
        return result;
    }

    public String decode(String value) {
        String result = "";

        try {
            result = decrypt(value);
        } catch (Exception ex) {
            result = "";
        }
        return result;
    }

    public static void main(String[] arguments) throws Exception {
        String encryptionKey = "MZygpewJsCpRrfOr";
        String plainText = "Hello world!";
        JCipher advancedEncryptionStandard = new JCipher(encryptionKey);
        String cipherText = advancedEncryptionStandard.encrypt(plainText);
        String decryptedCipherText = advancedEncryptionStandard.decrypt(cipherText);

        System.out.println(plainText);
        System.out.println(cipherText);
        System.out.println(decryptedCipherText);
    }

}