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org.apache.turbine.services.crypto.provider.UnixCrypt |
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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 org.apache.turbine.services.crypto.CryptoAlgorithm; |
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20 | ||
21 | /** |
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22 | * Implements Standard Unix crypt(3) for use with the Crypto Service. |
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23 | * |
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24 | * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> |
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25 | * @version $Id: UnixCrypt.java 264148 2005-08-29 14:21:04Z henning $ |
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26 | */ |
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27 | public class UnixCrypt |
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28 | implements CryptoAlgorithm |
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29 | { |
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30 | ||
31 | /** The seed to use */ |
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32 | 2 | private String seed = null; |
33 | ||
34 | /** standard Unix crypt chars (64) */ |
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35 | 2 | private static final char[] SALT_CHARS = |
36 | (("abcdefghijklmnopqrstuvwxyz" |
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37 | + "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789./").toCharArray()); |
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38 | ||
39 | /** |
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40 | * C'tor |
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41 | */ |
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42 | public UnixCrypt() |
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43 | 2 | { |
44 | 2 | } |
45 | ||
46 | /** |
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47 | * This class never uses anything but |
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48 | * UnixCrypt, so it is just a dummy |
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49 | * (Fixme: Should we throw an exception if |
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50 | * something is requested that we don't support? |
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51 | * |
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52 | * @param cipher Cipher (ignored) |
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53 | */ |
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54 | public void setCipher(String cipher) |
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55 | { |
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56 | /* dummy */ |
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57 | 2 | } |
58 | ||
59 | /** |
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60 | * Setting the seed for the UnixCrypt |
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61 | * algorithm. If a null value is supplied, |
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62 | * or no seed is set, then a random seed is used. |
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63 | * |
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64 | * @param seed The seed value to use. |
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65 | */ |
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66 | public void setSeed(String seed) |
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67 | { |
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68 | 6 | this.seed = seed; |
69 | 6 | } |
70 | ||
71 | /** |
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72 | * encrypt the supplied string with the requested cipher |
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73 | * |
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74 | * @param value The value to be encrypted |
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75 | * @return The encrypted value |
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76 | * @throws Exception An Exception of the underlying implementation. |
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77 | */ |
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78 | public String encrypt(String value) |
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79 | throws Exception |
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80 | { |
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81 | 6 | if (seed == null) |
82 | { |
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83 | 2 | java.util.Random randomGenerator = new java.util.Random(); |
84 | 2 | int numSaltChars = SALT_CHARS.length; |
85 | ||
86 | 2 | seed = (new StringBuffer()) |
87 | .append(SALT_CHARS[Math.abs(randomGenerator.nextInt()) |
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88 | % numSaltChars]) |
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89 | .append(SALT_CHARS[Math.abs(randomGenerator.nextInt()) |
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90 | % numSaltChars]) |
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91 | .toString(); |
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92 | } |
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93 | ||
94 | /* UnixCrypt seems to be a really widespread name... */ |
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95 | 6 | return new cryptix.tools.UnixCrypt(seed).crypt(value); |
96 | } |
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97 | ||
98 | } |
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