Apache Commons Codec Source Code

Apache Commons Codec library provides implementations of common encoders and decoders such as Base64, Hex, Phonetic and URLs.

Apache Commons Codec Source Code files are provided in both binary packge (commons-codec-3.15-bin.zip) and source package (commons-codec-3.15-src.zip). You can download them at Apache Commons Codec Website.

Apache Commons Codec Source Code has no dependencies. You can compile it to generate your own version of Apache Commons Codec JAR file.

The source code of Apache Commons Codec 1.15 is provided below:

✍: FYIcenter

org/apache/commons/codec/digest/UnixCrypt.java

/*
 * 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.apache.commons.codec.digest;

import java.nio.charset.StandardCharsets;
import java.security.SecureRandom;
import java.util.concurrent.ThreadLocalRandom;

/**
 * Unix crypt(3) algorithm implementation.
 * <p>
 * This class only implements the traditional 56 bit DES based algorithm. Please use DigestUtils.crypt() for a method
 * that distinguishes between all the algorithms supported in the current glibc's crypt().
 * <p>
 * The Java implementation was taken from the JetSpeed Portal project (see
 * org.apache.jetspeed.services.security.ldap.UnixCrypt).
 * <p>
 * This class is slightly incompatible if the given salt contains characters that are not part of the allowed range
 * [a-zA-Z0-9./].
 * <p>
 * This class is immutable and thread-safe.
 *
 * @since 1.7
 */
public class UnixCrypt {

    private static final int CON_SALT[] = { 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, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 5, 6,
            7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33,
            34, 35, 36, 37, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
            54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 0, 0, 0, 0, 0 };

    private static final int COV2CHAR[] = { 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 65, 66, 67, 68, 69, 70,
            71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 97, 98, 99, 100, 101, 102,
            103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122 };

    private static final char SALT_CHARS[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789./"
            .toCharArray();

    private static final boolean SHIFT2[] = { false, false, true, true, true, true, true, true, false, true, true,
            true, true, true, true, false };

    private static final int SKB[][] = {
            { 0, 16, 0x20000000, 0x20000010, 0x10000, 0x10010, 0x20010000, 0x20010010, 2048, 2064, 0x20000800,
                    0x20000810, 0x10800, 0x10810, 0x20010800, 0x20010810, 32, 48, 0x20000020, 0x20000030, 0x10020,
                    0x10030, 0x20010020, 0x20010030, 2080, 2096, 0x20000820, 0x20000830, 0x10820, 0x10830, 0x20010820,
                    0x20010830, 0x80000, 0x80010, 0x20080000, 0x20080010, 0x90000, 0x90010, 0x20090000, 0x20090010,
                    0x80800, 0x80810, 0x20080800, 0x20080810, 0x90800, 0x90810, 0x20090800, 0x20090810, 0x80020,
                    0x80030, 0x20080020, 0x20080030, 0x90020, 0x90030, 0x20090020, 0x20090030, 0x80820, 0x80830,
                    0x20080820, 0x20080830, 0x90820, 0x90830, 0x20090820, 0x20090830 },
            { 0, 0x2000000, 8192, 0x2002000, 0x200000, 0x2200000, 0x202000, 0x2202000, 4, 0x2000004, 8196, 0x2002004,
                    0x200004, 0x2200004, 0x202004, 0x2202004, 1024, 0x2000400, 9216, 0x2002400, 0x200400, 0x2200400,
                    0x202400, 0x2202400, 1028, 0x2000404, 9220, 0x2002404, 0x200404, 0x2200404, 0x202404, 0x2202404,
                    0x10000000, 0x12000000, 0x10002000, 0x12002000, 0x10200000, 0x12200000, 0x10202000, 0x12202000,
                    0x10000004, 0x12000004, 0x10002004, 0x12002004, 0x10200004, 0x12200004, 0x10202004, 0x12202004,
                    0x10000400, 0x12000400, 0x10002400, 0x12002400, 0x10200400, 0x12200400, 0x10202400, 0x12202400,
                    0x10000404, 0x12000404, 0x10002404, 0x12002404, 0x10200404, 0x12200404, 0x10202404, 0x12202404 },
            { 0, 1, 0x40000, 0x40001, 0x1000000, 0x1000001, 0x1040000, 0x1040001, 2, 3, 0x40002, 0x40003, 0x1000002,
                    0x1000003, 0x1040002, 0x1040003, 512, 513, 0x40200, 0x40201, 0x1000200, 0x1000201, 0x1040200,
                    0x1040201, 514, 515, 0x40202, 0x40203, 0x1000202, 0x1000203, 0x1040202, 0x1040203, 0x8000000,
                    0x8000001, 0x8040000, 0x8040001, 0x9000000, 0x9000001, 0x9040000, 0x9040001, 0x8000002, 0x8000003,
                    0x8040002, 0x8040003, 0x9000002, 0x9000003, 0x9040002, 0x9040003, 0x8000200, 0x8000201, 0x8040200,
                    0x8040201, 0x9000200, 0x9000201, 0x9040200, 0x9040201, 0x8000202, 0x8000203, 0x8040202, 0x8040203,
                    0x9000202, 0x9000203, 0x9040202, 0x9040203 },
            { 0, 0x100000, 256, 0x100100, 8, 0x100008, 264, 0x100108, 4096, 0x101000, 4352, 0x101100, 4104, 0x101008,
                    4360, 0x101108, 0x4000000, 0x4100000, 0x4000100, 0x4100100, 0x4000008, 0x4100008, 0x4000108,
                    0x4100108, 0x4001000, 0x4101000, 0x4001100, 0x4101100, 0x4001008, 0x4101008, 0x4001108, 0x4101108,
                    0x20000, 0x120000, 0x20100, 0x120100, 0x20008, 0x120008, 0x20108, 0x120108, 0x21000, 0x121000,
                    0x21100, 0x121100, 0x21008, 0x121008, 0x21108, 0x121108, 0x4020000, 0x4120000, 0x4020100,
                    0x4120100, 0x4020008, 0x4120008, 0x4020108, 0x4120108, 0x4021000, 0x4121000, 0x4021100, 0x4121100,
                    0x4021008, 0x4121008, 0x4021108, 0x4121108 },
            { 0, 0x10000000, 0x10000, 0x10010000, 4, 0x10000004, 0x10004, 0x10010004, 0x20000000, 0x30000000,
                    0x20010000, 0x30010000, 0x20000004, 0x30000004, 0x20010004, 0x30010004, 0x100000, 0x10100000,
                    0x110000, 0x10110000, 0x100004, 0x10100004, 0x110004, 0x10110004, 0x20100000, 0x30100000,
                    0x20110000, 0x30110000, 0x20100004, 0x30100004, 0x20110004, 0x30110004, 4096, 0x10001000, 0x11000,
                    0x10011000, 4100, 0x10001004, 0x11004, 0x10011004, 0x20001000, 0x30001000, 0x20011000, 0x30011000,
                    0x20001004, 0x30001004, 0x20011004, 0x30011004, 0x101000, 0x10101000, 0x111000, 0x10111000,
                    0x101004, 0x10101004, 0x111004, 0x10111004, 0x20101000, 0x30101000, 0x20111000, 0x30111000,
                    0x20101004, 0x30101004, 0x20111004, 0x30111004 },
            { 0, 0x8000000, 8, 0x8000008, 1024, 0x8000400, 1032, 0x8000408, 0x20000, 0x8020000, 0x20008, 0x8020008,
                    0x20400, 0x8020400, 0x20408, 0x8020408, 1, 0x8000001, 9, 0x8000009, 1025, 0x8000401, 1033,
                    0x8000409, 0x20001, 0x8020001, 0x20009, 0x8020009, 0x20401, 0x8020401, 0x20409, 0x8020409,
                    0x2000000, 0xa000000, 0x2000008, 0xa000008, 0x2000400, 0xa000400, 0x2000408, 0xa000408, 0x2020000,
                    0xa020000, 0x2020008, 0xa020008, 0x2020400, 0xa020400, 0x2020408, 0xa020408, 0x2000001, 0xa000001,
                    0x2000009, 0xa000009, 0x2000401, 0xa000401, 0x2000409, 0xa000409, 0x2020001, 0xa020001, 0x2020009,
                    0xa020009, 0x2020401, 0xa020401, 0x2020409, 0xa020409 },
            { 0, 256, 0x80000, 0x80100, 0x1000000, 0x1000100, 0x1080000, 0x1080100, 16, 272, 0x80010, 0x80110,
                    0x1000010, 0x1000110, 0x1080010, 0x1080110, 0x200000, 0x200100, 0x280000, 0x280100, 0x1200000,
                    0x1200100, 0x1280000, 0x1280100, 0x200010, 0x200110, 0x280010, 0x280110, 0x1200010, 0x1200110,
                    0x1280010, 0x1280110, 512, 768, 0x80200, 0x80300, 0x1000200, 0x1000300, 0x1080200, 0x1080300, 528,
                    784, 0x80210, 0x80310, 0x1000210, 0x1000310, 0x1080210, 0x1080310, 0x200200, 0x200300, 0x280200,
                    0x280300, 0x1200200, 0x1200300, 0x1280200, 0x1280300, 0x200210, 0x200310, 0x280210, 0x280310,
                    0x1200210, 0x1200310, 0x1280210, 0x1280310 },
            { 0, 0x4000000, 0x40000, 0x4040000, 2, 0x4000002, 0x40002, 0x4040002, 8192, 0x4002000, 0x42000, 0x4042000,
                    8194, 0x4002002, 0x42002, 0x4042002, 32, 0x4000020, 0x40020, 0x4040020, 34, 0x4000022, 0x40022,
                    0x4040022, 8224, 0x4002020, 0x42020, 0x4042020, 8226, 0x4002022, 0x42022, 0x4042022, 2048,
                    0x4000800, 0x40800, 0x4040800, 2050, 0x4000802, 0x40802, 0x4040802, 10240, 0x4002800, 0x42800,
                    0x4042800, 10242, 0x4002802, 0x42802, 0x4042802, 2080, 0x4000820, 0x40820, 0x4040820, 2082,
                    0x4000822, 0x40822, 0x4040822, 10272, 0x4002820, 0x42820, 0x4042820, 10274, 0x4002822, 0x42822,
                    0x4042822 } };

    private static final int SPTRANS[][] = {
            { 0x820200, 0x20000, 0x80800000, 0x80820200, 0x800000, 0x80020200, 0x80020000, 0x80800000, 0x80020200,
                    0x820200, 0x820000, 0x80000200, 0x80800200, 0x800000, 0, 0x80020000, 0x20000, 0x80000000,
                    0x800200, 0x20200, 0x80820200, 0x820000, 0x80000200, 0x800200, 0x80000000, 512, 0x20200,
                    0x80820000, 512, 0x80800200, 0x80820000, 0, 0, 0x80820200, 0x800200, 0x80020000, 0x820200,
                    0x20000, 0x80000200, 0x800200, 0x80820000, 512, 0x20200, 0x80800000, 0x80020200, 0x80000000,
                    0x80800000, 0x820000, 0x80820200, 0x20200, 0x820000, 0x80800200, 0x800000, 0x80000200, 0x80020000,
                    0, 0x20000, 0x800000, 0x80800200, 0x820200, 0x80000000, 0x80820000, 512, 0x80020200 },
            { 0x10042004, 0, 0x42000, 0x10040000, 0x10000004, 8196, 0x10002000, 0x42000, 8192, 0x10040004, 4,
                    0x10002000, 0x40004, 0x10042000, 0x10040000, 4, 0x40000, 0x10002004, 0x10040004, 8192, 0x42004,
                    0x10000000, 0, 0x40004, 0x10002004, 0x42004, 0x10042000, 0x10000004, 0x10000000, 0x40000, 8196,
                    0x10042004, 0x40004, 0x10042000, 0x10002000, 0x42004, 0x10042004, 0x40004, 0x10000004, 0,
                    0x10000000, 8196, 0x40000, 0x10040004, 8192, 0x10000000, 0x42004, 0x10002004, 0x10042000, 8192, 0,
                    0x10000004, 4, 0x10042004, 0x42000, 0x10040000, 0x10040004, 0x40000, 8196, 0x10002000, 0x10002004,
                    4, 0x10040000, 0x42000 },
            { 0x41000000, 0x1010040, 64, 0x41000040, 0x40010000, 0x1000000, 0x41000040, 0x10040, 0x1000040, 0x10000,
                    0x1010000, 0x40000000, 0x41010040, 0x40000040, 0x40000000, 0x41010000, 0, 0x40010000, 0x1010040,
                    64, 0x40000040, 0x41010040, 0x10000, 0x41000000, 0x41010000, 0x1000040, 0x40010040, 0x1010000,
                    0x10040, 0, 0x1000000, 0x40010040, 0x1010040, 64, 0x40000000, 0x10000, 0x40000040, 0x40010000,
                    0x1010000, 0x41000040, 0, 0x1010040, 0x10040, 0x41010000, 0x40010000, 0x1000000, 0x41010040,
                    0x40000000, 0x40010040, 0x41000000, 0x1000000, 0x41010040, 0x10000, 0x1000040, 0x41000040,
                    0x10040, 0x1000040, 0, 0x41010000, 0x40000040, 0x41000000, 0x40010040, 64, 0x1010000 },
            { 0x100402, 0x4000400, 2, 0x4100402, 0, 0x4100000, 0x4000402, 0x100002, 0x4100400, 0x4000002, 0x4000000,
                    1026, 0x4000002, 0x100402, 0x100000, 0x4000000, 0x4100002, 0x100400, 1024, 2, 0x100400, 0x4000402,
                    0x4100000, 1024, 1026, 0, 0x100002, 0x4100400, 0x4000400, 0x4100002, 0x4100402, 0x100000,
                    0x4100002, 1026, 0x100000, 0x4000002, 0x100400, 0x4000400, 2, 0x4100000, 0x4000402, 0, 1024,
                    0x100002, 0, 0x4100002, 0x4100400, 1024, 0x4000000, 0x4100402, 0x100402, 0x100000, 0x4100402, 2,
                    0x4000400, 0x100402, 0x100002, 0x100400, 0x4100000, 0x4000402, 1026, 0x4000000, 0x4000002,
                    0x4100400 },
            { 0x2000000, 16384, 256, 0x2004108, 0x2004008, 0x2000100, 16648, 0x2004000, 16384, 8, 0x2000008, 16640,
                    0x2000108, 0x2004008, 0x2004100, 0, 16640, 0x2000000, 16392, 264, 0x2000100, 16648, 0, 0x2000008,
                    8, 0x2000108, 0x2004108, 16392, 0x2004000, 256, 264, 0x2004100, 0x2004100, 0x2000108, 16392,
                    0x2004000, 16384, 8, 0x2000008, 0x2000100, 0x2000000, 16640, 0x2004108, 0, 16648, 0x2000000, 256,
                    16392, 0x2000108, 256, 0, 0x2004108, 0x2004008, 0x2004100, 264, 16384, 16640, 0x2004008,
                    0x2000100, 264, 8, 16648, 0x2004000, 0x2000008 },
            { 0x20000010, 0x80010, 0, 0x20080800, 0x80010, 2048, 0x20000810, 0x80000, 2064, 0x20080810, 0x80800,
                    0x20000000, 0x20000800, 0x20000010, 0x20080000, 0x80810, 0x80000, 0x20000810, 0x20080010, 0, 2048,
                    16, 0x20080800, 0x20080010, 0x20080810, 0x20080000, 0x20000000, 2064, 16, 0x80800, 0x80810,
                    0x20000800, 2064, 0x20000000, 0x20000800, 0x80810, 0x20080800, 0x80010, 0, 0x20000800, 0x20000000,
                    2048, 0x20080010, 0x80000, 0x80010, 0x20080810, 0x80800, 16, 0x20080810, 0x80800, 0x80000,
                    0x20000810, 0x20000010, 0x20080000, 0x80810, 0, 2048, 0x20000010, 0x20000810, 0x20080800,
                    0x20080000, 2064, 16, 0x20080010 },
            { 4096, 128, 0x400080, 0x400001, 0x401081, 4097, 4224, 0, 0x400000, 0x400081, 129, 0x401000, 1, 0x401080,
                    0x401000, 129, 0x400081, 4096, 4097, 0x401081, 0, 0x400080, 0x400001, 4224, 0x401001, 4225,
                    0x401080, 1, 4225, 0x401001, 128, 0x400000, 4225, 0x401000, 0x401001, 129, 4096, 128, 0x400000,
                    0x401001, 0x400081, 4225, 4224, 0, 128, 0x400001, 1, 0x400080, 0, 0x400081, 0x400080, 4224, 129,
                    4096, 0x401081, 0x400000, 0x401080, 1, 4097, 0x401081, 0x400001, 0x401080, 0x401000, 4097 },
            { 0x8200020, 0x8208000, 32800, 0, 0x8008000, 0x200020, 0x8200000, 0x8208020, 32, 0x8000000, 0x208000,
                    32800, 0x208020, 0x8008020, 0x8000020, 0x8200000, 32768, 0x208020, 0x200020, 0x8008000, 0x8208020,
                    0x8000020, 0, 0x208000, 0x8000000, 0x200000, 0x8008020, 0x8200020, 0x200000, 32768, 0x8208000, 32,
                    0x200000, 32768, 0x8000020, 0x8208020, 32800, 0x8000000, 0, 0x208000, 0x8200020, 0x8008020,
                    0x8008000, 0x200020, 0x8208000, 32, 0x200020, 0x8008000, 0x8208020, 0x200000, 0x8200000,
                    0x8000020, 0x208000, 32800, 0x8008020, 0x8200000, 32, 0x8208000, 0x208020, 0, 0x8000000,
                    0x8200020, 32768, 0x208020 } };

    /**
     * Generates a crypt(3) compatible hash using the DES algorithm.
     * <p>
     * A salt is generated for you using {@link ThreadLocalRandom}; for more secure salts consider using
     * {@link SecureRandom} to generate your own salts and calling {@link #crypt(byte[], String)}.
     * </p>
     *
     * @param original
     *            plaintext password
     * @return a 13 character string starting with the salt string
     */
    public static String crypt(final byte[] original) {
        return crypt(original, null);
    }

    /**
     * Generates a crypt(3) compatible hash using the DES algorithm.
     * <p>
     * Using unspecified characters as salt results incompatible hash values.
     * </p>
     *
     * @param original
     *            plaintext password
     * @param salt
     *            a two character string drawn from [a-zA-Z0-9./]. The salt may be null, in which case a salt is
     *            generated for you using {@link ThreadLocalRandom}; for more secure salts consider using
     *            {@link SecureRandom} to generate your own salts.
     * @return a 13 character string starting with the salt string
     * @throws IllegalArgumentException
     *             if the salt does not match the allowed pattern
     */
    public static String crypt(final byte[] original, String salt) {
        if (salt == null) {
            final ThreadLocalRandom randomGenerator = ThreadLocalRandom.current();
            final int numSaltChars = SALT_CHARS.length;
            salt = "" + SALT_CHARS[randomGenerator.nextInt(numSaltChars)] +
                    SALT_CHARS[randomGenerator.nextInt(numSaltChars)];
        } else if (!salt.matches("^[" + B64.B64T_STRING + "]{2,}$")) {
            throw new IllegalArgumentException("Invalid salt value: " + salt);
        }

        final StringBuilder buffer = new StringBuilder("             ");
        final char charZero = salt.charAt(0);
        final char charOne = salt.charAt(1);
        buffer.setCharAt(0, charZero);
        buffer.setCharAt(1, charOne);
        final int eSwap0 = CON_SALT[charZero];
        final int eSwap1 = CON_SALT[charOne] << 4;
        final byte key[] = new byte[8];
        for (int i = 0; i < key.length; i++) {
            key[i] = 0;
        }

        for (int i = 0; i < key.length && i < original.length; i++) {
            final int iChar = original[i];
            key[i] = (byte) (iChar << 1);
        }

        final int schedule[] = desSetKey(key);
        final int out[] = body(schedule, eSwap0, eSwap1);
        final byte b[] = new byte[9];
        intToFourBytes(out[0], b, 0);
        intToFourBytes(out[1], b, 4);
        b[8] = 0;
        int i = 2;
        int y = 0;
        int u = 128;
        for (; i < 13; i++) {
            int j = 0;
            int c = 0;
            for (; j < 6; j++) {
                c <<= 1;
                if ((b[y] & u) != 0) {
                    c |= 0x1;
                }
                u >>>= 1;
                if (u == 0) {
                    y++;
                    u = 128;
                }
                buffer.setCharAt(i, (char) COV2CHAR[c]);
            }
        }
        return buffer.toString();
    }

    /**
     * Generates a crypt(3) compatible hash using the DES algorithm.
     * <p>
     * A salt is generated for you using {@link ThreadLocalRandom}; for more secure salts consider using
     * {@link SecureRandom} to generate your own salts and calling {@link #crypt(String, String)}.
     * </p>
     *
     * @param original
     *            plaintext password
     * @return a 13 character string starting with the salt string
     */
    public static String crypt(final String original) {
        return crypt(original.getBytes(StandardCharsets.UTF_8));
    }

    /**
     * Generates a crypt(3) compatible hash using the DES algorithm.
     *
     * @param original
     *            plaintext password
     * @param salt
     *            a two character string drawn from [a-zA-Z0-9./]. The salt may be null, in which case a salt is
     *            generated for you using {@link ThreadLocalRandom}; for more secure salts consider using
     *            {@link SecureRandom} to generate your own salts.
     * @return a 13 character string starting with the salt string
     * @throws IllegalArgumentException
     *             if the salt does not match the allowed pattern
     */
    public static String crypt(final String original, final String salt) {
        return crypt(original.getBytes(StandardCharsets.UTF_8), salt);
    }

    private static int[] body(final int schedule[], final int eSwap0, final int eSwap1) {
        int left = 0;
        int right = 0;
        int t = 0;
        for (int j = 0; j < 25; j++) {
            for (int i = 0; i < 32; i += 4) {
                left = dEncrypt(left, right, i, eSwap0, eSwap1, schedule);
                right = dEncrypt(right, left, i + 2, eSwap0, eSwap1, schedule);
            }
            t = left;
            left = right;
            right = t;
        }

        t = right;
        right = left >>> 1 | left << 31;
        left = t >>> 1 | t << 31;
        final int results[] = new int[2];
        permOp(right, left, 1, 0x55555555, results);
        right = results[0];
        left = results[1];
        permOp(left, right, 8, 0xff00ff, results);
        left = results[0];
        right = results[1];
        permOp(right, left, 2, 0x33333333, results);
        right = results[0];
        left = results[1];
        permOp(left, right, 16, 65535, results);
        left = results[0];
        right = results[1];
        permOp(right, left, 4, 0xf0f0f0f, results);
        right = results[0];
        left = results[1];
        final int out[] = new int[2];
        out[0] = left;
        out[1] = right;
        return out;
    }

    private static int byteToUnsigned(final byte b) {
        final int value = b;
        return value < 0 ? value + 256 : value;
    }

    private static int dEncrypt(int el, final int r, final int s, final int e0, final int e1, final int sArr[]) {
        int v = r ^ r >>> 16;
        int u = v & e0;
        v &= e1;
        u = u ^ u << 16 ^ r ^ sArr[s];
        int t = v ^ v << 16 ^ r ^ sArr[s + 1];
        t = t >>> 4 | t << 28;
        el ^= SPTRANS[1][t & 0x3f] | SPTRANS[3][t >>> 8 & 0x3f] | SPTRANS[5][t >>> 16 & 0x3f] |
                SPTRANS[7][t >>> 24 & 0x3f] | SPTRANS[0][u & 0x3f] | SPTRANS[2][u >>> 8 & 0x3f] |
                SPTRANS[4][u >>> 16 & 0x3f] | SPTRANS[6][u >>> 24 & 0x3f];
        return el;
    }

    private static int[] desSetKey(final byte key[]) {
        final int schedule[] = new int[32];
        int c = fourBytesToInt(key, 0);
        int d = fourBytesToInt(key, 4);
        final int results[] = new int[2];
        permOp(d, c, 4, 0xf0f0f0f, results);
        d = results[0];
        c = results[1];
        c = hPermOp(c, -2, 0xcccc0000);
        d = hPermOp(d, -2, 0xcccc0000);
        permOp(d, c, 1, 0x55555555, results);
        d = results[0];
        c = results[1];
        permOp(c, d, 8, 0xff00ff, results);
        c = results[0];
        d = results[1];
        permOp(d, c, 1, 0x55555555, results);
        d = results[0];
        c = results[1];
        d = (d & 0xff) << 16 | d & 0xff00 | (d & 0xff0000) >>> 16 | (c & 0xf0000000) >>> 4;
        c &= 0xfffffff;
        int j = 0;
        for (int i = 0; i < 16; i++) {
            if (SHIFT2[i]) {
                c = c >>> 2 | c << 26;
                d = d >>> 2 | d << 26;
            } else {
                c = c >>> 1 | c << 27;
                d = d >>> 1 | d << 27;
            }
            c &= 0xfffffff;
            d &= 0xfffffff;
            int s = SKB[0][c & 0x3f] | SKB[1][c >>> 6 & 0x3 | c >>> 7 & 0x3c] |
                    SKB[2][c >>> 13 & 0xf | c >>> 14 & 0x30] |
                    SKB[3][c >>> 20 & 0x1 | c >>> 21 & 0x6 | c >>> 22 & 0x38];
            final int t = SKB[4][d & 0x3f] | SKB[5][d >>> 7 & 0x3 | d >>> 8 & 0x3c] | SKB[6][d >>> 15 & 0x3f] |
                    SKB[7][d >>> 21 & 0xf | d >>> 22 & 0x30];
            schedule[j++] = (t << 16 | s & 0xffff);
            s = s >>> 16 | t & 0xffff0000;
            s = s << 4 | s >>> 28;
            schedule[j++] = s;
        }

        return schedule;
    }

    private static int fourBytesToInt(final byte b[], int offset) {
        int value = byteToUnsigned(b[offset++]);
        value |= byteToUnsigned(b[offset++]) << 8;
        value |= byteToUnsigned(b[offset++]) << 16;
        value |= byteToUnsigned(b[offset++]) << 24;
        return value;
    }

    private static int hPermOp(int a, final int n, final int m) {
        final int t = (a << 16 - n ^ a) & m;
        a = a ^ t ^ t >>> 16 - n;
        return a;
    }

    private static void intToFourBytes(final int iValue, final byte b[], int offset) {
        b[offset++] = (byte) (iValue & 0xff);
        b[offset++] = (byte) (iValue >>> 8 & 0xff);
        b[offset++] = (byte) (iValue >>> 16 & 0xff);
        b[offset++] = (byte) (iValue >>> 24 & 0xff);
    }

    private static void permOp(int a, int b, final int n, final int m, final int results[]) {
        final int t = (a >>> n ^ b) & m;
        a ^= t << n;
        b ^= t;
        results[0] = a;
        results[1] = b;
    }

}

org/apache/commons/codec/digest/UnixCrypt.java

 

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Release date: 2020-09-01
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