org.netbeans.modules.mercurial.config.Scrambler Maven / Gradle / Ivy
/*
* 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.
*/
package org.netbeans.modules.mercurial.config;
import java.io.IOException;
import java.util.Base64;
/**
* Scrambles text (the password) using the standard scheme described in the
* CVS protocol version 1.10. This encoding is trivial and should not be
* used for security, but rather as a mechanism for avoiding inadvertant
* compromise.
*/
public class Scrambler {
/**
* The mapping array
*/
private int[] shifts;
/**
* The single instance of this class (Singleton design pattern)
*/
public static Scrambler instance;
/**
* Do not instantiate the scrambler directly. Use the getInstance() method
*/
private Scrambler() {
int i;
shifts = new int[256];
for (i = 0; i < 32; ++i) {
shifts[i] = i;
}
shifts[i++] = 114;
shifts[i++] = 120;
shifts[i++] = 53;
shifts[i++] = 79;
shifts[i++] = 96;
shifts[i++] = 109;
shifts[i++] = 72;
shifts[i++] = 108;
shifts[i++] = 70;
shifts[i++] = 64;
shifts[i++] = 76;
shifts[i++] = 67;
shifts[i++] = 116;
shifts[i++] = 74;
shifts[i++] = 68;
shifts[i++] = 87;
shifts[i++] = 111;
shifts[i++] = 52;
shifts[i++] = 75;
shifts[i++] = 119;
shifts[i++] = 49;
shifts[i++] = 34;
shifts[i++] = 82;
shifts[i++] = 81;
shifts[i++] = 95;
shifts[i++] = 65;
shifts[i++] = 112;
shifts[i++] = 86;
shifts[i++] = 118;
shifts[i++] = 110;
shifts[i++] = 122;
shifts[i++] = 105;
shifts[i++] = 41;
shifts[i++] = 57;
shifts[i++] = 83;
shifts[i++] = 43;
shifts[i++] = 46;
shifts[i++] = 102;
shifts[i++] = 40;
shifts[i++] = 89;
shifts[i++] = 38;
shifts[i++] = 103;
shifts[i++] = 45;
shifts[i++] = 50;
shifts[i++] = 42;
shifts[i++] = 123;
shifts[i++] = 91;
shifts[i++] = 35;
shifts[i++] = 125;
shifts[i++] = 55;
shifts[i++] = 54;
shifts[i++] = 66;
shifts[i++] = 124;
shifts[i++] = 126;
shifts[i++] = 59;
shifts[i++] = 47;
shifts[i++] = 92;
shifts[i++] = 71;
shifts[i++] = 115;
shifts[i++] = 78;
shifts[i++] = 88;
shifts[i++] = 107;
shifts[i++] = 106;
shifts[i++] = 56;
shifts[i++] = 36;
shifts[i++] = 121;
shifts[i++] = 117;
shifts[i++] = 104;
shifts[i++] = 101;
shifts[i++] = 100;
shifts[i++] = 69;
shifts[i++] = 73;
shifts[i++] = 99;
shifts[i++] = 63;
shifts[i++] = 94;
shifts[i++] = 93;
shifts[i++] = 39;
shifts[i++] = 37;
shifts[i++] = 61;
shifts[i++] = 48;
shifts[i++] = 58;
shifts[i++] = 113;
shifts[i++] = 32;
shifts[i++] = 90;
shifts[i++] = 44;
shifts[i++] = 98;
shifts[i++] = 60;
shifts[i++] = 51;
shifts[i++] = 33;
shifts[i++] = 97;
shifts[i++] = 62;
shifts[i++] = 77;
shifts[i++] = 84;
shifts[i++] = 80;
shifts[i++] = 85;
shifts[i++] = 223;
shifts[i++] = 225;
shifts[i++] = 216;
shifts[i++] = 187;
shifts[i++] = 166;
shifts[i++] = 229;
shifts[i++] = 189;
shifts[i++] = 222;
shifts[i++] = 188;
shifts[i++] = 141;
shifts[i++] = 249;
shifts[i++] = 148;
shifts[i++] = 200;
shifts[i++] = 184;
shifts[i++] = 136;
shifts[i++] = 248;
shifts[i++] = 190;
shifts[i++] = 199;
shifts[i++] = 170;
shifts[i++] = 181;
shifts[i++] = 204;
shifts[i++] = 138;
shifts[i++] = 232;
shifts[i++] = 218;
shifts[i++] = 183;
shifts[i++] = 255;
shifts[i++] = 234;
shifts[i++] = 220;
shifts[i++] = 247;
shifts[i++] = 213;
shifts[i++] = 203;
shifts[i++] = 226;
shifts[i++] = 193;
shifts[i++] = 174;
shifts[i++] = 172;
shifts[i++] = 228;
shifts[i++] = 252;
shifts[i++] = 217;
shifts[i++] = 201;
shifts[i++] = 131;
shifts[i++] = 230;
shifts[i++] = 197;
shifts[i++] = 211;
shifts[i++] = 145;
shifts[i++] = 238;
shifts[i++] = 161;
shifts[i++] = 179;
shifts[i++] = 160;
shifts[i++] = 212;
shifts[i++] = 207;
shifts[i++] = 221;
shifts[i++] = 254;
shifts[i++] = 173;
shifts[i++] = 202;
shifts[i++] = 146;
shifts[i++] = 224;
shifts[i++] = 151;
shifts[i++] = 140;
shifts[i++] = 196;
shifts[i++] = 205;
shifts[i++] = 130;
shifts[i++] = 135;
shifts[i++] = 133;
shifts[i++] = 143;
shifts[i++] = 246;
shifts[i++] = 192;
shifts[i++] = 159;
shifts[i++] = 244;
shifts[i++] = 239;
shifts[i++] = 185;
shifts[i++] = 168;
shifts[i++] = 215;
shifts[i++] = 144;
shifts[i++] = 139;
shifts[i++] = 165;
shifts[i++] = 180;
shifts[i++] = 157;
shifts[i++] = 147;
shifts[i++] = 186;
shifts[i++] = 214;
shifts[i++] = 176;
shifts[i++] = 227;
shifts[i++] = 231;
shifts[i++] = 219;
shifts[i++] = 169;
shifts[i++] = 175;
shifts[i++] = 156;
shifts[i++] = 206;
shifts[i++] = 198;
shifts[i++] = 129;
shifts[i++] = 164;
shifts[i++] = 150;
shifts[i++] = 210;
shifts[i++] = 154;
shifts[i++] = 177;
shifts[i++] = 134;
shifts[i++] = 127;
shifts[i++] = 182;
shifts[i++] = 128;
shifts[i++] = 158;
shifts[i++] = 208;
shifts[i++] = 162;
shifts[i++] = 132;
shifts[i++] = 167;
shifts[i++] = 209;
shifts[i++] = 149;
shifts[i++] = 241;
shifts[i++] = 153;
shifts[i++] = 251;
shifts[i++] = 237;
shifts[i++] = 236;
shifts[i++] = 171;
shifts[i++] = 195;
shifts[i++] = 243;
shifts[i++] = 233;
shifts[i++] = 253;
shifts[i++] = 240;
shifts[i++] = 194;
shifts[i++] = 250;
shifts[i++] = 191;
shifts[i++] = 155;
shifts[i++] = 142;
shifts[i++] = 137;
shifts[i++] = 245;
shifts[i++] = 235;
shifts[i++] = 163;
shifts[i++] = 242;
shifts[i++] = 178;
shifts[i++] = 152;
}
/**
* Get an instance of the standard scrambler
*/
public static Scrambler getInstance() {
if (instance == null) {
instance = new Scrambler();
}
return instance;
}
public String descramble(String scrambledText) {
StringBuffer buf = new StringBuffer();
if (scrambledText != null) {
byte[] decoded = decode(scrambledText);
for (int i = 1; i < decoded.length; ++i) {
buf.append(scramble((char)decoded[i]));
}
}
return buf.toString();
}
private char scramble(char ch) {
int i = ( shifts[ (((int) ch) & 0xFF) & 255] & 255 ) &
( shifts[ (((int) ch) & 0x00FF) & 255] & 255 );
return Character.toChars(i)[0];
}
private byte[] decode(String str) {
return Base64.getMimeDecoder().decode(str);
}
}