org.gumtree.security.EncryptionUtils.java Source code

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Here is the source code for org.gumtree.security.EncryptionUtils.java

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/*******************************************************************************
 * Copyright (c) 2012 Australian Nuclear Science and Technology Organisation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Bragg Institute - initial API and implementation
 ******************************************************************************/

package org.gumtree.security;

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

import org.apache.commons.codec.binary.Base64;
import org.gumtree.core.CoreProperties;

// See: http://stackoverflow.com/questions/1205135/how-to-encrypt-string-in-java
public final class EncryptionUtils {

    public static String encryptBase64(String input) throws Exception {
        return encryptBase64(input, CoreProperties.CRYPTO_KEY.getValue(), CoreProperties.CRYPTO_IV.getValue());
    }

    public static String encryptBase64(String input, String key, String iv) throws Exception {
        byte[] inputBytes = input.getBytes();
        SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "DES");
        IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
        byte[] encrypted = new byte[cipher.getOutputSize(inputBytes.length)];
        int enc_len = cipher.update(inputBytes, 0, inputBytes.length, encrypted, 0);
        enc_len += cipher.doFinal(encrypted, enc_len);
        return new String(Base64.encodeBase64(encrypted));
    }

    public static String decryptBase64(String encrytedBase64String) throws Exception {
        return decryptBase64(encrytedBase64String, CoreProperties.CRYPTO_KEY.getValue(),
                CoreProperties.CRYPTO_IV.getValue());
    }

    public static String decryptBase64(String encrytedBase64String, String key, String iv) throws Exception {
        byte[] data = Base64.decodeBase64(encrytedBase64String.getBytes());
        SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "DES");
        IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
        byte[] decrypted = new byte[cipher.getOutputSize(data.length)];
        int dec_len = cipher.update(data, 0, data.length, decrypted, 0);
        dec_len += cipher.doFinal(decrypted, dec_len);
        return new String(decrypted).trim();
    }

    private EncryptionUtils() {
        super();
    }

}