001 package org.apache.fulcrum.crypto.provider; 002 003 /* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022 023 import org.apache.fulcrum.crypto.CryptoAlgorithm; 024 025 import java.util.Random; 026 027 /** 028 * Implements Standard Unix crypt(3) for use with the Crypto Service. 029 * 030 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> 031 * @version $Id: UnixCrypt.java 581797 2007-10-04 08:26:18Z sgoeschl $ 032 */ 033 034 public class UnixCrypt 035 implements CryptoAlgorithm 036 { 037 038 /** The seed to use */ 039 private String seed = null; 040 041 /** standard Unix crypt chars (64) */ 042 private static final char[] SALT_CHARS = 043 (("abcdefghijklmnopqrstuvwxyz" + 044 "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789./").toCharArray()); 045 046 047 /** 048 * C'tor 049 * 050 */ 051 052 public UnixCrypt() 053 { 054 } 055 056 /** 057 * This class never uses anything but 058 * UnixCrypt, so it is just a dummy 059 * (Fixme: Should we throw an exception if 060 * something is requested that we don't support? 061 * 062 * @param cipher Cipher (ignored) 063 */ 064 065 public void setCipher(String cipher) 066 { 067 /* dummy */ 068 } 069 070 /** 071 * Setting the seed for the UnixCrypt 072 * algorithm. If a null value is supplied, 073 * or no seed is set, then a random seed is used. 074 * 075 * @param seed The seed value to use. 076 */ 077 078 public void setSeed(String seed) 079 { 080 this.seed = seed; 081 } 082 083 /** 084 * encrypt the supplied string with the requested cipher 085 * 086 * @param value The value to be encrypted 087 * @return The encrypted value 088 * @throws Exception An Exception of the underlying implementation. 089 */ 090 public String encrypt(String value) 091 throws Exception 092 { 093 if (seed == null) 094 { 095 Random randomGenerator = new java.util.Random(); 096 int numSaltChars = SALT_CHARS.length; 097 098 seed = (new StringBuffer()) 099 .append(SALT_CHARS[Math.abs(randomGenerator.nextInt()) 100 % numSaltChars]) 101 .append(SALT_CHARS[Math.abs(randomGenerator.nextInt()) 102 % numSaltChars]) 103 .toString(); 104 } 105 106 return org.apache.fulcrum.crypto.impl.UnixCrypt.crypt(seed, value); 107 } 108 }