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/*
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* Copyright 2012 Brian Rosenberger (Brutex Network)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.brutex.xservices.util;
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/*
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* Copyright 2010 Andrew Kroh
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* A simple class for encoding and decoding passwords for CVS pserver protocol.
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* Can be used to recover forgotten passwords.
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*
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* <p>
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* Adapted from: http://blog.zmeeagain.com/2005/01/recover-cvs-pserver-passwords.html
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*/
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public class CvsPassword
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{
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private static final char[] LOOKUP_TABLE =
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{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 114, 120, 53,
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79, 0, 109, 72, 108, 70, 64, 76, 67, 116, 74, 68, 87, 111, 52, 75,
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119, 49, 34, 82, 81, 95, 65, 112, 86, 118, 110, 122, 105, 41, 57,
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83, 43, 46, 102, 40, 89, 38, 103, 45, 50, 42, 123, 91, 35, 125, 55,
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54, 66, 124, 126, 59, 47, 92, 71, 115, 78, 88, 107, 106, 56, 0,
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121, 117, 104, 101, 100, 69, 73, 99, 63, 94, 93, 39, 37, 61, 48,
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58, 113, 32, 90, 44, 98, 60, 51, 33, 97, 62, 77, 84, 80, 85};
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/**
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* Encodes a CVS password to be used in .cvspass file. Throws an exception
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* if clearText is null, if a character is found outside the 0 - 126 range, or
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* if within the range, one of the non-allowed characters.
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*
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* @param clearText
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* the password in clear to be encoded
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*
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* @return the encoded cvs password
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*/
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public static String encode(String clearText)
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{
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// First character of encoded version is A:
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char[] encoded = new char[clearText.length() + 1];
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encoded[0] = 'A';
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// Skip the first character:
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int counter = 1;
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for (char c : clearText.toCharArray())
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{
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if (c == '`' || c == '$' || c < 32)
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{
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throw new IllegalArgumentException(
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"Illegal character was found in clear password.");
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}
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encoded[counter++] = LOOKUP_TABLE[c];
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}
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return String.valueOf(encoded);
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}
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/**
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* Recovers an encoded via pserver protocol CVS password.
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*
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* @param encodedPassword
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* the encoded password to be decoded
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*
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* @return the decoded password or null if the input was
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* null or empty
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*/
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public static String decode(String encodedPassword)
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{
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String rtn = null;
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if (encodedPassword != null && encodedPassword.length() > 0)
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{
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if (encodedPassword.startsWith("A"))
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{
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rtn = encode(encodedPassword.substring(1)).substring(1);
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}
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else
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{
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rtn = encode(encodedPassword).substring(1);
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}
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}
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return rtn;
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}
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public static void main(String[] sArgs)
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{
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final String TEST_WORD = "i07w91";
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String encoded = CvsPassword.encode(TEST_WORD);
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System.out.println("Encoded: <" + encoded + ">");
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String decoded = CvsPassword.decode(encoded);
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System.out.println("Decoded: <" + decoded + ">");
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System.out.println(decoded.equals(TEST_WORD) ? "Test Passed" : "Test Failed");
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}
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}
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