| package org.apache.fulcrum.crypto.provider; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| import java.security.MessageDigest; |
| |
| import org.apache.commons.codec.binary.Base64; |
| import org.apache.fulcrum.crypto.CryptoAlgorithm; |
| |
| /** |
| * Implements the normal java.security.MessageDigest stream cipers. Base64 |
| * strings returned by this provider are correctly padded to multiples of four |
| * bytes. If you run into interoperability problems with other languages, |
| * especially perl and the Digest::MD5 module, note that the md5_base64 function |
| * from this package incorrectly drops the pad bytes. Use the MIME::Base64 |
| * package instead. |
| * |
| * If you upgrade from Turbine 2.1 and suddently your old stored passwords no |
| * longer work, please take a look at the OldJavaCrypt provider for bug-to-bug |
| * compatibility. |
| * |
| * This provider can be used as the default crypto algorithm provider. |
| * |
| * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> |
| * @version $Id$ |
| */ |
| |
| public class JavaCrypt implements CryptoAlgorithm { |
| |
| /** The default cipher */ |
| public static final String DEFAULT_CIPHER = "SHA"; |
| |
| /** The cipher to use for encryption */ |
| private String cipher = null; |
| |
| /** |
| * Constructo |
| * |
| */ |
| public JavaCrypt() |
| { |
| this.cipher = DEFAULT_CIPHER; |
| } |
| |
| /** |
| * Setting the actual cipher requested. If not called, then the default cipher |
| * (SHA) is used. |
| * |
| * This will never throw an error even if there is no provider for this cipher. |
| * The error will be thrown by encrypt() (Fixme?) |
| * |
| * @param cipher The cipher to use. |
| * |
| */ |
| public void setCipher(String cipher) |
| { |
| this.cipher = cipher; |
| } |
| |
| /** |
| * This class never uses a seed, so this is just a dummy. |
| * |
| * @param seed Seed (ignored) |
| * |
| */ |
| public void setSeed(String seed) |
| { |
| /* dummy */ |
| } |
| |
| /** |
| * encrypt the supplied string with the requested cipher |
| * |
| * @param value The value to be encrypted |
| * @return The encrypted value |
| * @throws Exception An Exception of the underlying implementation. |
| */ |
| public String encrypt(String value) throws Exception |
| { |
| MessageDigest md = MessageDigest.getInstance(cipher); |
| |
| // We need to use unicode here, to be independent of platform's |
| // default encoding. Thanks to SGawin for spotting this. |
| byte[] digest = md.digest(value.getBytes("UTF-8")); |
| |
| // Base64-encode the digest. |
| byte[] encodedDigest = Base64.encodeBase64(digest); |
| return (encodedDigest == null ? null : new String(encodedDigest, "UTF-8")); |
| } |
| } |