Java tutorial
/* * * * * Copyright (c) 2014 Antoine Jullien * * * * Licensed under the Apache License, Version 2.0 (the "License"); * * you may not use this file except in compliance with the License. * * You may obtain a copy of the License at * * * * http://www.apache.org/licenses/LICENSE-2.0 * * * Unless required by applicable law or agreed to in writing, software * * distributed under the License is distributed on an "AS IS" BASIS, * * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * * See the License for the specific language governing permissions and * * limitations under the License. * */ package com.cirrus.utils; import org.apache.commons.codec.binary.Base64; import java.io.UnsupportedEncodingException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.security.SecureRandom; import java.util.Arrays; import java.util.Random; public class EncryptionUtils { //================================================================================================================== // Attributes //================================================================================================================== private static final Random random = new SecureRandom(); //================================================================================================================== // Public //================================================================================================================== public static String encrypt(final String value) { final String salt = Integer.toString(random.nextInt()); return makePasswordHash(value, salt); } public static boolean match(final String noEncryptedValue, final String encryptedValue) { final String salt = encryptedValue.split("_")[1]; return encryptedValue.equals(makePasswordHash(noEncryptedValue, salt)); } //================================================================================================================== // Private //================================================================================================================== private static String makePasswordHash(final String value, final String salt) { try { final String saltedAndHashed = value + "," + salt; final MessageDigest digest = MessageDigest.getInstance("MD5"); digest.update(saltedAndHashed.getBytes()); final byte hashedBytes[] = (new String(digest.digest(), "UTF-8")).getBytes(); final Base64 base64 = new Base64(); return Arrays.toString(base64.encode(hashedBytes)) + '_' + salt; } catch (final NoSuchAlgorithmException e) { throw new RuntimeException("MD5 is not available", e); } catch (final UnsupportedEncodingException e) { throw new RuntimeException("UTF-8 unavailable? Not a chance", e); } } }