| /******************************************************************************* |
| * Copyright (c) 2011 SAP AG |
| * 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: |
| * Lazar Kirchev, SAP AG - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.equinox.console.storage; |
| |
| import java.security.MessageDigest; |
| /******************************************************************************* |
| * Copyright (c) 2011 SAP AG |
| * 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: |
| * Lazar Kirchev, SAP AG - initial API and implementation |
| *******************************************************************************/ |
| |
| import java.security.NoSuchAlgorithmException; |
| |
| /** |
| * This class provides utility method for one-way hashing of strings |
| * |
| */ |
| public class DigestUtil { |
| private static final char[] HEX_CHARS = "0123456789abcdef".toCharArray(); |
| private static final String MD5 = "MD5"; |
| private static final String SHA1 = "SHA1"; |
| |
| /** |
| * Create a one-way hash of an input strings. First a MD5 hash of the input string |
| * is calculated and appended to the string, and then the new string is hashed with SHA1 |
| * |
| * @param originalText the string to be hashed |
| * @return hashed string |
| * @throws Exception |
| */ |
| public static String encrypt(String originalText)throws Exception{ |
| try { |
| String password_salt = appendSalt(originalText); |
| byte[] sha_digest; |
| |
| sha_digest = getDigest(password_salt.getBytes(), SHA1); |
| return asHex(sha_digest); |
| } catch (NoSuchAlgorithmException e) { |
| throw new Exception ("Encryption Failed!"); |
| } |
| } |
| |
| private static String appendSalt(String inputPassword) throws NoSuchAlgorithmException{ |
| byte [] salt = getDigest(inputPassword.getBytes(), MD5); |
| return inputPassword + asHex(salt); |
| } |
| |
| //byte array into hexademical string |
| private static String asHex(byte[] buf) |
| { |
| char[] chars = new char[2 * buf.length]; |
| for (int i = 0; i < buf.length; ++i) |
| { |
| chars[2 * i] = HEX_CHARS[(buf[i] & 0xF0) >>> 4]; |
| chars[2 * i + 1] = HEX_CHARS[buf[i] & 0x0F]; |
| } |
| return new String(chars); |
| } |
| |
| //generate digest byte[] |
| private static byte[] getDigest(byte[] inputData, String algorithm) throws NoSuchAlgorithmException { |
| MessageDigest md = MessageDigest.getInstance(algorithm); |
| md.update(inputData); |
| return md.digest(); |
| } |
| } |