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org.apache.turbine.services.crypto.provider.JavaCrypt |
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1 | package org.apache.turbine.services.crypto.provider; |
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2 | ||
3 | /* |
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4 | * Copyright 2001-2005 The Apache Software Foundation. |
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5 | * |
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6 | * Licensed under the Apache License, Version 2.0 (the "License") |
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7 | * you may not use this file except in compliance with the License. |
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8 | * You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | ||
19 | import java.security.MessageDigest; |
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20 | ||
21 | import org.apache.commons.codec.binary.Base64; |
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22 | ||
23 | import org.apache.turbine.services.crypto.CryptoAlgorithm; |
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24 | ||
25 | /** |
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26 | * Implements the normal java.security.MessageDigest stream cipers. |
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27 | * Base64 strings returned by this provider are correctly padded to |
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28 | * multiples of four bytes. If you run into interoperability problems |
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29 | * with other languages, especially perl and the Digest::MD5 module, |
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30 | * note that the md5_base64 function from this package incorrectly drops |
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31 | * the pad bytes. Use the MIME::Base64 package instead. |
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32 | * |
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33 | * If you upgrade from Turbine 2.1 and suddently your old stored passwords |
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34 | * no longer work, please take a look at the OldJavaCrypt provider for |
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35 | * bug-to-bug compatibility. |
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36 | * |
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37 | * This provider can be used as the default crypto algorithm provider. |
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38 | * |
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39 | * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> |
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40 | * @version $Id: JavaCrypt.java 264148 2005-08-29 14:21:04Z henning $ |
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41 | */ |
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42 | public class JavaCrypt |
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43 | implements CryptoAlgorithm |
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44 | { |
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45 | ||
46 | /** The default cipher */ |
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47 | public static final String DEFAULT_CIPHER = "SHA"; |
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48 | ||
49 | /** The cipher to use for encryption */ |
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50 | 8 | private String cipher = null; |
51 | ||
52 | /** |
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53 | * C'tor |
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54 | */ |
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55 | public JavaCrypt() |
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56 | 8 | { |
57 | 8 | this.cipher = DEFAULT_CIPHER; |
58 | 8 | } |
59 | ||
60 | /** |
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61 | * Setting the actual cipher requested. If not |
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62 | * called, then the default cipher (SHA) is used. |
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63 | * |
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64 | * This will never throw an error even if there is no |
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65 | * provider for this cipher. The error will be thrown |
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66 | * by encrypt() (Fixme?) |
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67 | * |
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68 | * @param cipher The cipher to use. |
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69 | */ |
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70 | public void setCipher(String cipher) |
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71 | { |
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72 | 16 | this.cipher = cipher; |
73 | 16 | } |
74 | ||
75 | /** |
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76 | * This class never uses a seed, so this is |
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77 | * just a dummy. |
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78 | * |
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79 | * @param seed Seed (ignored) |
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80 | */ |
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81 | public void setSeed(String seed) |
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82 | { |
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83 | /* dummy */ |
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84 | 0 | } |
85 | ||
86 | /** |
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87 | * encrypt the supplied string with the requested cipher |
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88 | * |
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89 | * @param value The value to be encrypted |
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90 | * @return The encrypted value |
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91 | * @throws Exception An Exception of the underlying implementation. |
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92 | */ |
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93 | public String encrypt(String value) |
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94 | throws Exception |
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95 | { |
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96 | 8 | MessageDigest md = MessageDigest.getInstance(cipher); |
97 | ||
98 | // We need to use unicode here, to be independent of platform's |
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99 | // default encoding. Thanks to SGawin for spotting this. |
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100 | 8 | byte[] digest = md.digest(value.getBytes("UTF-8")); |
101 | ||
102 | // Base64-encode the digest. |
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103 | 8 | byte[] encodedDigest = Base64.encodeBase64(digest); |
104 | 8 | return (encodedDigest == null ? class="keyword">null : new String(encodedDigest)); |
105 | } |
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106 | ||
107 | } |
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