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/*
 * 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.util.Random;

import org.apache.commons.codec.Charsets;

/**
 * Unix crypt(3) algorithm implementation.
 * 

* 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(). *

* The Java implementation was taken from the JetSpeed Portal project (see * org.apache.jetspeed.services.security.ldap.UnixCrypt). *

* This class is slightly incompatible if the given salt contains characters that are not part of the allowed range * [a-zA-Z0-9./]. *

* This class is immutable and thread-safe. * * @version $Id: UnixCrypt.java 1429868 2013-01-07 16:08:05Z ggregory $ * @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. *

* As no salt is given, a random one will be used. * * @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. *

* Using unspecified characters as salt results incompatible hash values. * * @param original * plaintext password * @param salt * a two character string drawn from [a-zA-Z0-9./] or null for a random one * @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 Random randomGenerator = new Random(); final int numSaltChars = SALT_CHARS.length; salt = "" + SALT_CHARS[randomGenerator.nextInt(numSaltChars)] + SALT_CHARS[randomGenerator.nextInt(numSaltChars)]; } else if (!salt.matches("^[" + B64.B64T + "]{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. *

* As no salt is given, a random one is used. * * @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(Charsets.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./] or null for a random one * @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(Charsets.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; } }





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