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/*
* Copyright 2012 Brian Rosenberger (Brutex Network)
*
* Licensed 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.
*/
package net.brutex.xservices.util;
/*
* Copyright 2010 Andrew Kroh
*
* Licensed 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.
*/
/**
* A simple class for encoding and decoding passwords for CVS pserver protocol.
* Can be used to recover forgotten passwords.
*
* <p>
* Adapted from: http://blog.zmeeagain.com/2005/01/recover-cvs-pserver-passwords.html
*/
public class CvsPassword
{
private static final char[] LOOKUP_TABLE =
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 114, 120, 53,
79, 0, 109, 72, 108, 70, 64, 76, 67, 116, 74, 68, 87, 111, 52, 75,
119, 49, 34, 82, 81, 95, 65, 112, 86, 118, 110, 122, 105, 41, 57,
83, 43, 46, 102, 40, 89, 38, 103, 45, 50, 42, 123, 91, 35, 125, 55,
54, 66, 124, 126, 59, 47, 92, 71, 115, 78, 88, 107, 106, 56, 0,
121, 117, 104, 101, 100, 69, 73, 99, 63, 94, 93, 39, 37, 61, 48,
58, 113, 32, 90, 44, 98, 60, 51, 33, 97, 62, 77, 84, 80, 85};
/**
* Encodes a CVS password to be used in .cvspass file. Throws an exception
* if clearText is null, if a character is found outside the 0 - 126 range, or
* if within the range, one of the non-allowed characters.
*
* @param clearText
* the password in clear to be encoded
*
* @return the encoded cvs password
*/
public static String encode(String clearText)
{
// First character of encoded version is A:
char[] encoded = new char[clearText.length() + 1];
encoded[0] = 'A';
// Skip the first character:
int counter = 1;
for (char c : clearText.toCharArray())
{
if (c == '`' || c == '$' || c < 32)
{
throw new IllegalArgumentException(
"Illegal character was found in clear password.");
}
encoded[counter++] = LOOKUP_TABLE[c];
}
return String.valueOf(encoded);
}
/**
* Recovers an encoded via pserver protocol CVS password.
*
* @param encodedPassword
* the encoded password to be decoded
*
* @return the decoded password or null if the input was
* null or empty
*/
public static String decode(String encodedPassword)
{
String rtn = null;
if (encodedPassword != null && encodedPassword.length() > 0)
{
if (encodedPassword.startsWith("A"))
{
rtn = encode(encodedPassword.substring(1)).substring(1);
}
else
{
rtn = encode(encodedPassword).substring(1);
}
}
return rtn;
}
public static void main(String[] sArgs)
{
final String TEST_WORD = "i07w91";
String encoded = CvsPassword.encode(TEST_WORD);
System.out.println("Encoded: <" + encoded + ">");
String decoded = CvsPassword.decode(encoded);
System.out.println("Decoded: <" + decoded + ">");
System.out.println(decoded.equals(TEST_WORD) ? "Test Passed" : "Test Failed");
}
}