net.wastl.webmail.misc.Helper.java Source code

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Here is the source code for net.wastl.webmail.misc.Helper.java

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/*
 * @(#)$Id: Helper.java 116 2008-10-30 06:12:51Z unsaved $
 *
 * Copyright 2008 by the JWebMail Development Team and Sebastian Schaffert.
 *
 * 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.wastl.webmail.misc;

import java.math.BigInteger;
import java.net.InetAddress;
import java.util.Enumeration;
import java.util.StringTokenizer;

import javax.mail.Address;

import net.wastl.webmail.server.http.HTTPRequestHeader;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Miscellaneous helper routines.
 *
 * Created: Tue Sep  7 13:03:44 1999
 *
 * @author Sebastian Schaffert
 */
public class Helper {
    private static Log log = LogFactory.getLog(Helper.class);
    private static Log threadDumperLog = LogFactory.getLog("THREAD.DUMPER");

    private static final int ITERATIONS = 16;

    private static final int con_salt[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x05, 0x06, 0x07, 0x08, 0x09,
            0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A,
            0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25,
            0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
            0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x00, 0x00, 0x00, 0x00, 0x00, };

    private static final boolean shifts2[] = { false, false, true, true, true, true, true, true, false, true, true,
            true, true, true, true, false };

    private static final int skb[][] = { {
            /* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
            0x00000000, 0x00000010, 0x20000000, 0x20000010, 0x00010000, 0x00010010, 0x20010000, 0x20010010,
            0x00000800, 0x00000810, 0x20000800, 0x20000810, 0x00010800, 0x00010810, 0x20010800, 0x20010810,
            0x00000020, 0x00000030, 0x20000020, 0x20000030, 0x00010020, 0x00010030, 0x20010020, 0x20010030,
            0x00000820, 0x00000830, 0x20000820, 0x20000830, 0x00010820, 0x00010830, 0x20010820, 0x20010830,
            0x00080000, 0x00080010, 0x20080000, 0x20080010, 0x00090000, 0x00090010, 0x20090000, 0x20090010,
            0x00080800, 0x00080810, 0x20080800, 0x20080810, 0x00090800, 0x00090810, 0x20090800, 0x20090810,
            0x00080020, 0x00080030, 0x20080020, 0x20080030, 0x00090020, 0x00090030, 0x20090020, 0x20090030,
            0x00080820, 0x00080830, 0x20080820, 0x20080830, 0x00090820, 0x00090830, 0x20090820, 0x20090830, },
            {
                    /* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
                    0x00000000, 0x02000000, 0x00002000, 0x02002000, 0x00200000, 0x02200000, 0x00202000, 0x02202000,
                    0x00000004, 0x02000004, 0x00002004, 0x02002004, 0x00200004, 0x02200004, 0x00202004, 0x02202004,
                    0x00000400, 0x02000400, 0x00002400, 0x02002400, 0x00200400, 0x02200400, 0x00202400, 0x02202400,
                    0x00000404, 0x02000404, 0x00002404, 0x02002404, 0x00200404, 0x02200404, 0x00202404, 0x02202404,
                    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, },
            {
                    /* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
                    0x00000000, 0x00000001, 0x00040000, 0x00040001, 0x01000000, 0x01000001, 0x01040000, 0x01040001,
                    0x00000002, 0x00000003, 0x00040002, 0x00040003, 0x01000002, 0x01000003, 0x01040002, 0x01040003,
                    0x00000200, 0x00000201, 0x00040200, 0x00040201, 0x01000200, 0x01000201, 0x01040200, 0x01040201,
                    0x00000202, 0x00000203, 0x00040202, 0x00040203, 0x01000202, 0x01000203, 0x01040202, 0x01040203,
                    0x08000000, 0x08000001, 0x08040000, 0x08040001, 0x09000000, 0x09000001, 0x09040000, 0x09040001,
                    0x08000002, 0x08000003, 0x08040002, 0x08040003, 0x09000002, 0x09000003, 0x09040002, 0x09040003,
                    0x08000200, 0x08000201, 0x08040200, 0x08040201, 0x09000200, 0x09000201, 0x09040200, 0x09040201,
                    0x08000202, 0x08000203, 0x08040202, 0x08040203, 0x09000202, 0x09000203, 0x09040202,
                    0x09040203, },
            {
                    /* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
                    0x00000000, 0x00100000, 0x00000100, 0x00100100, 0x00000008, 0x00100008, 0x00000108, 0x00100108,
                    0x00001000, 0x00101000, 0x00001100, 0x00101100, 0x00001008, 0x00101008, 0x00001108, 0x00101108,
                    0x04000000, 0x04100000, 0x04000100, 0x04100100, 0x04000008, 0x04100008, 0x04000108, 0x04100108,
                    0x04001000, 0x04101000, 0x04001100, 0x04101100, 0x04001008, 0x04101008, 0x04001108, 0x04101108,
                    0x00020000, 0x00120000, 0x00020100, 0x00120100, 0x00020008, 0x00120008, 0x00020108, 0x00120108,
                    0x00021000, 0x00121000, 0x00021100, 0x00121100, 0x00021008, 0x00121008, 0x00021108, 0x00121108,
                    0x04020000, 0x04120000, 0x04020100, 0x04120100, 0x04020008, 0x04120008, 0x04020108, 0x04120108,
                    0x04021000, 0x04121000, 0x04021100, 0x04121100, 0x04021008, 0x04121008, 0x04021108,
                    0x04121108, },
            {
                    /* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
                    0x00000000, 0x10000000, 0x00010000, 0x10010000, 0x00000004, 0x10000004, 0x00010004, 0x10010004,
                    0x20000000, 0x30000000, 0x20010000, 0x30010000, 0x20000004, 0x30000004, 0x20010004, 0x30010004,
                    0x00100000, 0x10100000, 0x00110000, 0x10110000, 0x00100004, 0x10100004, 0x00110004, 0x10110004,
                    0x20100000, 0x30100000, 0x20110000, 0x30110000, 0x20100004, 0x30100004, 0x20110004, 0x30110004,
                    0x00001000, 0x10001000, 0x00011000, 0x10011000, 0x00001004, 0x10001004, 0x00011004, 0x10011004,
                    0x20001000, 0x30001000, 0x20011000, 0x30011000, 0x20001004, 0x30001004, 0x20011004, 0x30011004,
                    0x00101000, 0x10101000, 0x00111000, 0x10111000, 0x00101004, 0x10101004, 0x00111004, 0x10111004,
                    0x20101000, 0x30101000, 0x20111000, 0x30111000, 0x20101004, 0x30101004, 0x20111004,
                    0x30111004, },
            {
                    /* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */
                    0x00000000, 0x08000000, 0x00000008, 0x08000008, 0x00000400, 0x08000400, 0x00000408, 0x08000408,
                    0x00020000, 0x08020000, 0x00020008, 0x08020008, 0x00020400, 0x08020400, 0x00020408, 0x08020408,
                    0x00000001, 0x08000001, 0x00000009, 0x08000009, 0x00000401, 0x08000401, 0x00000409, 0x08000409,
                    0x00020001, 0x08020001, 0x00020009, 0x08020009, 0x00020401, 0x08020401, 0x00020409, 0x08020409,
                    0x02000000, 0x0A000000, 0x02000008, 0x0A000008, 0x02000400, 0x0A000400, 0x02000408, 0x0A000408,
                    0x02020000, 0x0A020000, 0x02020008, 0x0A020008, 0x02020400, 0x0A020400, 0x02020408, 0x0A020408,
                    0x02000001, 0x0A000001, 0x02000009, 0x0A000009, 0x02000401, 0x0A000401, 0x02000409, 0x0A000409,
                    0x02020001, 0x0A020001, 0x02020009, 0x0A020009, 0x02020401, 0x0A020401, 0x02020409,
                    0x0A020409, },
            {
                    /* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */
                    0x00000000, 0x00000100, 0x00080000, 0x00080100, 0x01000000, 0x01000100, 0x01080000, 0x01080100,
                    0x00000010, 0x00000110, 0x00080010, 0x00080110, 0x01000010, 0x01000110, 0x01080010, 0x01080110,
                    0x00200000, 0x00200100, 0x00280000, 0x00280100, 0x01200000, 0x01200100, 0x01280000, 0x01280100,
                    0x00200010, 0x00200110, 0x00280010, 0x00280110, 0x01200010, 0x01200110, 0x01280010, 0x01280110,
                    0x00000200, 0x00000300, 0x00080200, 0x00080300, 0x01000200, 0x01000300, 0x01080200, 0x01080300,
                    0x00000210, 0x00000310, 0x00080210, 0x00080310, 0x01000210, 0x01000310, 0x01080210, 0x01080310,
                    0x00200200, 0x00200300, 0x00280200, 0x00280300, 0x01200200, 0x01200300, 0x01280200, 0x01280300,
                    0x00200210, 0x00200310, 0x00280210, 0x00280310, 0x01200210, 0x01200310, 0x01280210,
                    0x01280310, },
            {
                    /* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */
                    0x00000000, 0x04000000, 0x00040000, 0x04040000, 0x00000002, 0x04000002, 0x00040002, 0x04040002,
                    0x00002000, 0x04002000, 0x00042000, 0x04042000, 0x00002002, 0x04002002, 0x00042002, 0x04042002,
                    0x00000020, 0x04000020, 0x00040020, 0x04040020, 0x00000022, 0x04000022, 0x00040022, 0x04040022,
                    0x00002020, 0x04002020, 0x00042020, 0x04042020, 0x00002022, 0x04002022, 0x00042022, 0x04042022,
                    0x00000800, 0x04000800, 0x00040800, 0x04040800, 0x00000802, 0x04000802, 0x00040802, 0x04040802,
                    0x00002800, 0x04002800, 0x00042800, 0x04042800, 0x00002802, 0x04002802, 0x00042802, 0x04042802,
                    0x00000820, 0x04000820, 0x00040820, 0x04040820, 0x00000822, 0x04000822, 0x00040822, 0x04040822,
                    0x00002820, 0x04002820, 0x00042820, 0x04042820, 0x00002822, 0x04002822, 0x00042822,
                    0x04042822, }, };

    private static final int SPtrans[][] = { {
            /* nibble 0 */
            0x00820200, 0x00020000, 0x80800000, 0x80820200, 0x00800000, 0x80020200, 0x80020000, 0x80800000,
            0x80020200, 0x00820200, 0x00820000, 0x80000200, 0x80800200, 0x00800000, 0x00000000, 0x80020000,
            0x00020000, 0x80000000, 0x00800200, 0x00020200, 0x80820200, 0x00820000, 0x80000200, 0x00800200,
            0x80000000, 0x00000200, 0x00020200, 0x80820000, 0x00000200, 0x80800200, 0x80820000, 0x00000000,
            0x00000000, 0x80820200, 0x00800200, 0x80020000, 0x00820200, 0x00020000, 0x80000200, 0x00800200,
            0x80820000, 0x00000200, 0x00020200, 0x80800000, 0x80020200, 0x80000000, 0x80800000, 0x00820000,
            0x80820200, 0x00020200, 0x00820000, 0x80800200, 0x00800000, 0x80000200, 0x80020000, 0x00000000,
            0x00020000, 0x00800000, 0x80800200, 0x00820200, 0x80000000, 0x80820000, 0x00000200, 0x80020200, },
            {
                    /* nibble 1 */
                    0x10042004, 0x00000000, 0x00042000, 0x10040000, 0x10000004, 0x00002004, 0x10002000, 0x00042000,
                    0x00002000, 0x10040004, 0x00000004, 0x10002000, 0x00040004, 0x10042000, 0x10040000, 0x00000004,
                    0x00040000, 0x10002004, 0x10040004, 0x00002000, 0x00042004, 0x10000000, 0x00000000, 0x00040004,
                    0x10002004, 0x00042004, 0x10042000, 0x10000004, 0x10000000, 0x00040000, 0x00002004, 0x10042004,
                    0x00040004, 0x10042000, 0x10002000, 0x00042004, 0x10042004, 0x00040004, 0x10000004, 0x00000000,
                    0x10000000, 0x00002004, 0x00040000, 0x10040004, 0x00002000, 0x10000000, 0x00042004, 0x10002004,
                    0x10042000, 0x00002000, 0x00000000, 0x10000004, 0x00000004, 0x10042004, 0x00042000, 0x10040000,
                    0x10040004, 0x00040000, 0x00002004, 0x10002000, 0x10002004, 0x00000004, 0x10040000,
                    0x00042000, },
            {
                    /* nibble 2 */
                    0x41000000, 0x01010040, 0x00000040, 0x41000040, 0x40010000, 0x01000000, 0x41000040, 0x00010040,
                    0x01000040, 0x00010000, 0x01010000, 0x40000000, 0x41010040, 0x40000040, 0x40000000, 0x41010000,
                    0x00000000, 0x40010000, 0x01010040, 0x00000040, 0x40000040, 0x41010040, 0x00010000, 0x41000000,
                    0x41010000, 0x01000040, 0x40010040, 0x01010000, 0x00010040, 0x00000000, 0x01000000, 0x40010040,
                    0x01010040, 0x00000040, 0x40000000, 0x00010000, 0x40000040, 0x40010000, 0x01010000, 0x41000040,
                    0x00000000, 0x01010040, 0x00010040, 0x41010000, 0x40010000, 0x01000000, 0x41010040, 0x40000000,
                    0x40010040, 0x41000000, 0x01000000, 0x41010040, 0x00010000, 0x01000040, 0x41000040, 0x00010040,
                    0x01000040, 0x00000000, 0x41010000, 0x40000040, 0x41000000, 0x40010040, 0x00000040,
                    0x01010000, },
            {
                    /* nibble 3 */
                    0x00100402, 0x04000400, 0x00000002, 0x04100402, 0x00000000, 0x04100000, 0x04000402, 0x00100002,
                    0x04100400, 0x04000002, 0x04000000, 0x00000402, 0x04000002, 0x00100402, 0x00100000, 0x04000000,
                    0x04100002, 0x00100400, 0x00000400, 0x00000002, 0x00100400, 0x04000402, 0x04100000, 0x00000400,
                    0x00000402, 0x00000000, 0x00100002, 0x04100400, 0x04000400, 0x04100002, 0x04100402, 0x00100000,
                    0x04100002, 0x00000402, 0x00100000, 0x04000002, 0x00100400, 0x04000400, 0x00000002, 0x04100000,
                    0x04000402, 0x00000000, 0x00000400, 0x00100002, 0x00000000, 0x04100002, 0x04100400, 0x00000400,
                    0x04000000, 0x04100402, 0x00100402, 0x00100000, 0x04100402, 0x00000002, 0x04000400, 0x00100402,
                    0x00100002, 0x00100400, 0x04100000, 0x04000402, 0x00000402, 0x04000000, 0x04000002,
                    0x04100400, },
            {
                    /* nibble 4 */
                    0x02000000, 0x00004000, 0x00000100, 0x02004108, 0x02004008, 0x02000100, 0x00004108, 0x02004000,
                    0x00004000, 0x00000008, 0x02000008, 0x00004100, 0x02000108, 0x02004008, 0x02004100, 0x00000000,
                    0x00004100, 0x02000000, 0x00004008, 0x00000108, 0x02000100, 0x00004108, 0x00000000, 0x02000008,
                    0x00000008, 0x02000108, 0x02004108, 0x00004008, 0x02004000, 0x00000100, 0x00000108, 0x02004100,
                    0x02004100, 0x02000108, 0x00004008, 0x02004000, 0x00004000, 0x00000008, 0x02000008, 0x02000100,
                    0x02000000, 0x00004100, 0x02004108, 0x00000000, 0x00004108, 0x02000000, 0x00000100, 0x00004008,
                    0x02000108, 0x00000100, 0x00000000, 0x02004108, 0x02004008, 0x02004100, 0x00000108, 0x00004000,
                    0x00004100, 0x02004008, 0x02000100, 0x00000108, 0x00000008, 0x00004108, 0x02004000,
                    0x02000008, },
            {
                    /* nibble 5 */
                    0x20000010, 0x00080010, 0x00000000, 0x20080800, 0x00080010, 0x00000800, 0x20000810, 0x00080000,
                    0x00000810, 0x20080810, 0x00080800, 0x20000000, 0x20000800, 0x20000010, 0x20080000, 0x00080810,
                    0x00080000, 0x20000810, 0x20080010, 0x00000000, 0x00000800, 0x00000010, 0x20080800, 0x20080010,
                    0x20080810, 0x20080000, 0x20000000, 0x00000810, 0x00000010, 0x00080800, 0x00080810, 0x20000800,
                    0x00000810, 0x20000000, 0x20000800, 0x00080810, 0x20080800, 0x00080010, 0x00000000, 0x20000800,
                    0x20000000, 0x00000800, 0x20080010, 0x00080000, 0x00080010, 0x20080810, 0x00080800, 0x00000010,
                    0x20080810, 0x00080800, 0x00080000, 0x20000810, 0x20000010, 0x20080000, 0x00080810, 0x00000000,
                    0x00000800, 0x20000010, 0x20000810, 0x20080800, 0x20080000, 0x00000810, 0x00000010,
                    0x20080010, },
            {
                    /* nibble 6 */
                    0x00001000, 0x00000080, 0x00400080, 0x00400001, 0x00401081, 0x00001001, 0x00001080, 0x00000000,
                    0x00400000, 0x00400081, 0x00000081, 0x00401000, 0x00000001, 0x00401080, 0x00401000, 0x00000081,
                    0x00400081, 0x00001000, 0x00001001, 0x00401081, 0x00000000, 0x00400080, 0x00400001, 0x00001080,
                    0x00401001, 0x00001081, 0x00401080, 0x00000001, 0x00001081, 0x00401001, 0x00000080, 0x00400000,
                    0x00001081, 0x00401000, 0x00401001, 0x00000081, 0x00001000, 0x00000080, 0x00400000, 0x00401001,
                    0x00400081, 0x00001081, 0x00001080, 0x00000000, 0x00000080, 0x00400001, 0x00000001, 0x00400080,
                    0x00000000, 0x00400081, 0x00400080, 0x00001080, 0x00000081, 0x00001000, 0x00401081, 0x00400000,
                    0x00401080, 0x00000001, 0x00001001, 0x00401081, 0x00400001, 0x00401080, 0x00401000,
                    0x00001001, },
            {
                    /* nibble 7 */
                    0x08200020, 0x08208000, 0x00008020, 0x00000000, 0x08008000, 0x00200020, 0x08200000, 0x08208020,
                    0x00000020, 0x08000000, 0x00208000, 0x00008020, 0x00208020, 0x08008020, 0x08000020, 0x08200000,
                    0x00008000, 0x00208020, 0x00200020, 0x08008000, 0x08208020, 0x08000020, 0x00000000, 0x00208000,
                    0x08000000, 0x00200000, 0x08008020, 0x08200020, 0x00200000, 0x00008000, 0x08208000, 0x00000020,
                    0x00200000, 0x00008000, 0x08000020, 0x08208020, 0x00008020, 0x08000000, 0x00000000, 0x00208000,
                    0x08200020, 0x08008020, 0x08008000, 0x00200020, 0x08208000, 0x00000020, 0x00200020, 0x08008000,
                    0x08208020, 0x00200000, 0x08200000, 0x08000020, 0x00208000, 0x00008020, 0x08008020, 0x08200000,
                    0x00000020, 0x08208000, 0x00208020, 0x00000000, 0x08000000, 0x08200020, 0x00008000,
                    0x00208020 } };

    private static final int cov_2char[] = { 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
            0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, 0x51,
            0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
            0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
            0x7A };

    private static final int byteToUnsigned(byte b) {
        int value = (int) b;

        return (value >= 0 ? value : value + 256);
    }

    private static int fourBytesToInt(byte b[], int offset) {
        int value;

        value = byteToUnsigned(b[offset++]);
        value |= (byteToUnsigned(b[offset++]) << 8);
        value |= (byteToUnsigned(b[offset++]) << 16);
        value |= (byteToUnsigned(b[offset++]) << 24);

        return (value);
    }

    private static final void intToFourBytes(int iValue, 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 final void PERM_OP(int a, int b, int n, int m, int results[]) {
        int t;

        t = ((a >>> n) ^ b) & m;
        a ^= t << n;
        b ^= t;

        results[0] = a;
        results[1] = b;
    }

    private static final int HPERM_OP(int a, int n, int m) {
        int t;

        t = ((a << (16 - n)) ^ a) & m;
        a = a ^ t ^ (t >>> (16 - n));

        return (a);
    }

    private static int[] des_set_key(byte key[]) {
        int schedule[] = new int[ITERATIONS * 2];

        int c = fourBytesToInt(key, 0);
        int d = fourBytesToInt(key, 4);

        int results[] = new int[2];

        PERM_OP(d, c, 4, 0x0f0f0f0f, results);
        d = results[0];
        c = results[1];

        c = HPERM_OP(c, -2, 0xcccc0000);
        d = HPERM_OP(d, -2, 0xcccc0000);

        PERM_OP(d, c, 1, 0x55555555, results);
        d = results[0];
        c = results[1];

        PERM_OP(c, d, 8, 0x00ff00ff, results);
        c = results[0];
        d = results[1];

        PERM_OP(d, c, 1, 0x55555555, results);
        d = results[0];
        c = results[1];

        d = (((d & 0x000000ff) << 16) | (d & 0x0000ff00) | ((d & 0x00ff0000) >>> 16) | ((c & 0xf0000000) >>> 4));
        c &= 0x0fffffff;

        int s, t;
        int j = 0;

        for (int i = 0; i < ITERATIONS; i++) {
            if (shifts2[i]) {
                c = (c >>> 2) | (c << 26);
                d = (d >>> 2) | (d << 26);
            } else {
                c = (c >>> 1) | (c << 27);
                d = (d >>> 1) | (d << 27);
            }

            c &= 0x0fffffff;
            d &= 0x0fffffff;

            s = skb[0][(c) & 0x3f] | skb[1][((c >>> 6) & 0x03) | ((c >>> 7) & 0x3c)]
                    | skb[2][((c >>> 13) & 0x0f) | ((c >>> 14) & 0x30)]
                    | skb[3][((c >>> 20) & 0x01) | ((c >>> 21) & 0x06) | ((c >>> 22) & 0x38)];

            t = skb[4][(d) & 0x3f] | skb[5][((d >>> 7) & 0x03) | ((d >>> 8) & 0x3c)] | skb[6][(d >>> 15) & 0x3f]
                    | skb[7][((d >>> 21) & 0x0f) | ((d >>> 22) & 0x30)];

            schedule[j++] = ((t << 16) | (s & 0x0000ffff)) & 0xffffffff;
            s = ((s >>> 16) | (t & 0xffff0000));

            s = (s << 4) | (s >>> 28);
            schedule[j++] = s & 0xffffffff;
        }
        return (schedule);
    }

    private static final int D_ENCRYPT(int L, int R, int S, int E0, int E1, int s[]) {
        int t, u, v;

        v = R ^ (R >>> 16);
        u = v & E0;
        v = v & E1;
        u = (u ^ (u << 16)) ^ R ^ s[S];
        t = (v ^ (v << 16)) ^ R ^ s[S + 1];
        t = (t >>> 4) | (t << 28);

        L ^= 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 (L);
    }

    private static final int[] body(int schedule[], int Eswap0, int Eswap1) {
        int left = 0;
        int right = 0;
        int t = 0;

        for (int j = 0; j < 25; j++) {
            for (int i = 0; i < ITERATIONS * 2; i += 4) {
                left = D_ENCRYPT(left, right, i, Eswap0, Eswap1, schedule);
                right = D_ENCRYPT(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);

        left &= 0xffffffff;
        right &= 0xffffffff;

        int results[] = new int[2];

        PERM_OP(right, left, 1, 0x55555555, results);
        right = results[0];
        left = results[1];

        PERM_OP(left, right, 8, 0x00ff00ff, results);
        left = results[0];
        right = results[1];

        PERM_OP(right, left, 2, 0x33333333, results);
        right = results[0];
        left = results[1];

        PERM_OP(left, right, 16, 0x0000ffff, results);
        left = results[0];
        right = results[1];

        PERM_OP(right, left, 4, 0x0f0f0f0f, results);
        right = results[0];
        left = results[1];

        int out[] = new int[2];

        out[0] = left;
        out[1] = right;

        return (out);
    }

    /**
     * Perform a Unix crypt() operation
     */
    public static final String crypt(String salt, String original) {
        while (salt.length() < 2)
            salt += "A";

        StringBuilder buffer = new StringBuilder("             ");

        char charZero = salt.charAt(0);
        char charOne = salt.charAt(1);

        buffer.setCharAt(0, charZero);
        buffer.setCharAt(1, charOne);

        int Eswap0 = con_salt[(int) charZero];
        int Eswap1 = con_salt[(int) charOne] << 4;

        byte key[] = new byte[8];

        for (int i = 0; i < key.length; i++)
            key[i] = (byte) 0;

        for (int i = 0; i < key.length && i < original.length(); i++) {
            int iChar = (int) original.charAt(i);

            key[i] = (byte) (iChar << 1);
        }

        int schedule[] = des_set_key(key);
        int out[] = body(schedule, Eswap0, Eswap1);

        byte b[] = new byte[9];

        intToFourBytes(out[0], b, 0);
        intToFourBytes(out[1], b, 4);
        b[8] = 0;

        for (int i = 2, y = 0, u = 0x80; i < 13; i++) {
            for (int j = 0, c = 0; j < 6; j++) {
                c <<= 1;

                if (((int) b[y] & u) != 0)
                    c |= 1;

                u >>>= 1;

                if (u == 0) {
                    y++;
                    u = 0x80;
                }
                buffer.setCharAt(i, (char) cov_2char[c]);
            }
        }
        return (buffer.toString());
    }

    public static String joinAddress(Address[] a) {
        String s = "";
        if (a != null) {
            for (int i = 0; i < a.length; i++) {
                s += a[i].toString() + ", ";
            }
            if (s.length() >= 2) {
                s = s.substring(0, s.length() - 2);
            }
        } else {
            s = "";
        }
        return s;
    }

    /**
     * Calculate session-ID for a session.
     *
     * @param a Adress of the remote host
     * @param h Requestheader of the remote user agent
     * @returns Session-ID
     */
    public static String calcSessionCode(InetAddress a, HTTPRequestHeader h) {
        String temp = a.toString().replace('\n', ' ') + h.getHeader("User-Agent").replace('\n', ' ');
        temp = "" + Long.toHexString(Math.abs(temp.hashCode()));
        if (h.getContent("login") != null && !h.getContent("login").equals("")
                && h.getPath().startsWith("/login")) {
            temp += Long.toHexString(Math.abs(h.getContent("login").hashCode()));
            temp += Long.toHexString(System.currentTimeMillis());
        } else if (h.getPath().startsWith("/admin/login")) {
            temp += "admin";
        }

        return temp;
    }

    /**
     * Encodes and decodes any String given on the command-line.
     * Unit test.
     */
    public static void main(String[] args) {
        if (args.length != 1)
            throw new IllegalArgumentException("SYNTAX:  " + Helper.class.getName() + " 'string to en/decode'");
        String input = args[0];
        //System.err.println(Helper.crypt("AA",args[1]));
        String crypted = encryptTEA(input);
        //System.err.println("DES-Crypted: "+crypted);
        //System.err.println("DES-Decrypted: "+decryptTEA(crypted));
        String output = decryptTEA(crypted);
        if (input.equals(output))
            System.exit(0);
        throw new RuntimeException("Input of (" + input + "), length " + input.length()
                + ", encrypted then decrypted into (" + output + "), length " + output.length() + '.');
    }

    private static String str_key = "39e858f86df9b909a8c87cb8d9ad599";

    public static String encryptTEA(String src) {
        byte[] key = new BigInteger(str_key, 16).toByteArray();
        TEA tea = new TEA(key);
        byte plainSource[] = src.getBytes();
        int enc[] = tea.encode(plainSource, plainSource.length);

        String s = "";
        for (int i = 0; i < enc.length; i++) {
            s += Integer.toHexString((byte) (enc[i] >>> 24) + 128).toUpperCase() + ":";
            s += Integer.toHexString((byte) (enc[i] >>> 16) + 128).toUpperCase() + ":";
            s += Integer.toHexString((byte) (enc[i] >>> 8) + 128).toUpperCase() + ":";
            s += Integer.toHexString((byte) (enc[i]) + 128).toUpperCase() + ":";
        }
        // log.debug("encryptTEA: Returning "+s);
        return s;
    }

    static private java.util.regex.Pattern nonGraphPattern = java.util.regex.Pattern.compile("[^\\p{Graph}].*");

    public static String decryptTEA(String src) {
        StringTokenizer tok = new StringTokenizer(src, ": ");
        byte[] key = new BigInteger(str_key, 16).toByteArray();
        TEA tea = new TEA(key);
        byte inb[] = new byte[tok.countTokens()];
        for (int i = 0; i < inb.length && tok.hasMoreTokens(); i++) {
            String s = tok.nextToken();
            try {
                inb[i] = (byte) (Integer.parseInt(s, 16) - 128);
            } catch (NumberFormatException ex) {
                throw new NumberFormatException("Could not convert string '" + s + "' to byte.");
            }
        }
        byte dec[] = tea.decode(inb, inb.length);
        String s = new String(dec);
        // log.debug("encryptTEA: Returning "+s);
        java.util.regex.Matcher m = nonGraphPattern.matcher(s);
        if (!m.find())
            return s;
        log.warn("Executed work-around for TEA decryption bug");
        String fixedS = m.replaceFirst("");
        if (s.equals(fixedS))
            log.warn("The TEA work-around was not needed in this case");
        // I believe the rot of the bug is with padding in the TEA.decode()
        // method(s).  I do not have time to fix the real problem there.
        return fixedS;
    }

    /**
     * Here we figure out which quote level this line has, simply by counting how many
     * ">" are in front of the line, ignoring all whitespaces.
     */
    public static int getQuoteLevel(String token) {
        int current_quotelevel = 0;
        for (int i = 0; i < token.length()
                && (token.substring(i).startsWith(">") || token.substring(i).startsWith(" ")); i++) {
            if (token.substring(i).startsWith(">"))
                current_quotelevel++;
        }
        return current_quotelevel;
    }

    protected static int findFittingBreakPos(String line, int linesize) {
        int pos;
        for (pos = linesize; pos > 0; pos--) {
            switch (line.charAt(pos)) {
            case ' ':
            case '\n':
            case '\t':
            case '.':
            case ',':
            case ';':
            case ':':
            case '!':
            case '?':
                return pos + 1;
            }
        }
        return linesize + 1;
    }

    public static Enumeration breakLine(String line, int linesize, int quotelevel) {
        if (line.length() <= linesize) {
            final String s = line;
            return new Enumeration() {
                int count = 0;

                public boolean hasMoreElements() {
                    return count == 0;
                }

                public Object nextElement() {
                    count++;
                    if (count == 1)
                        return s;
                    else
                        return null;
                }
            };
        } else {
            int breakpos = findFittingBreakPos(line, linesize);
            final String first = line.substring(0, breakpos);
            String rest = "";
            for (int i = 0; i < quotelevel; i++)
                rest += ">";
            rest += line.substring(breakpos);
            final Enumeration enumVar = breakLine(rest, linesize, quotelevel);
            return new Enumeration() {
                int count = 0;

                public boolean hasMoreElements() {
                    return count < 1 || enumVar.hasMoreElements();
                }

                public Object nextElement() {
                    count++;
                    if (count == 1) {
                        return first;
                    } else {
                        return enumVar.nextElement();
                    }
                }
            };
        }
    }

    static public void logThreads(String label) {
        ThreadGroup tG = Thread.currentThread().getThreadGroup();
        // These pointers are cheap.
        // Since these counts probably don't count nested items, we have
        // to allocate liberally.
        Thread[] threads = new Thread[tG.activeCount() * 10];
        ThreadGroup[] threadGroups = new ThreadGroup[tG.activeGroupCount() * 10];
        int tCount = tG.enumerate(threads, true);
        int tgCount = tG.enumerate(threadGroups, true);
        threadDumperLog.debug(label + ".  Recursive counts.  ThreadGroups: " + tgCount + ", Threads: " + tCount);
        for (int i = 0; i < tCount; i++)
            threadDumperLog.debug(threads[i].toString());
        for (int i = 0; i < tgCount; i++)
            threadDumperLog.debug(threadGroups[i].toString());
    }
}