/*
 * $Header: /cvsroot/l2j/L2_Tools/java/net/sf/l2j/crypt/BlowfishEngine.java,v 1.1 2004/06/27 20:02:26 l2chef Exp $
 *
 * $Author: l2chef $
 * $Date: 2004/06/27 20:02:26 $
 * $Revision: 1.1 $
 * $Log: BlowfishEngine.java,v $
 * Revision 1.1  2004/06/27 20:02:26  l2chef
 * init
 *
 * Revision 1.2  2004/06/27 08:51:43  jeichhorn
 * Added copyright notice
 *
 *
 */
package net.sf.l2j.crypt;

import java.io.IOException;

/**
 * This file is based on the Blowfish Engine that is part of
 * the BouncyCastle JCE
 *
 * Copyright (c) 2000 The Legion Of The Bouncy Castle (http://www.bouncycastle.org)
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
 * and associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies
 * or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 *  @version $Revision: 1.1 $ $Date: 2004/06/27 20:02:26 $
 */
public class BlowfishEngine
{
   private final static int[] KP = {0x243F6A88, 0x85A308D3, 0x13198A2E,
         0x03707344, 0xA4093822, 0x299F31D0, 0x082EFA98, 0xEC4E6C89,
         0x452821E6, 0x38D01377, 0xBE5466CF, 0x34E90C6C, 0xC0AC29B7,
         0xC97C50DD, 0x3F84D5B5, 0xB5470917, 0x9216D5D9, 0x8979FB1B};
   private final static int[] KS0 = {0xD1310BA6, 0x98DFB5AC, 0x2FFD72DB,
         0xD01ADFB7, 0xB8E1AFED, 0x6A267E96, 0xBA7C9045, 0xF12C7F99,
         0x24A19947, 0xB3916CF7, 0x0801F2E2, 0x858EFC16, 0x636920D8,
         0x71574E69, 0xA458FEA3, 0xF4933D7E, 0x0D95748F, 0x728EB658,
         0x718BCD58, 0x82154AEE, 0x7B54A41D, 0xC25A59B5, 0x9C30D539,
         0x2AF26013, 0xC5D1B023, 0x286085F0, 0xCA417918, 0xB8DB38EF,
         0x8E79DCB0, 0x603A180E, 0x6C9E0E8B, 0xB01E8A3E, 0xD71577C1,
         0xBD314B27, 0x78AF2FDA, 0x55605C60, 0xE65525F3, 0xAA55AB94,
         0x57489862, 0x63E81440, 0x55CA396A, 0x2AAB10B6, 0xB4CC5C34,
         0x1141E8CE, 0xA15486AF, 0x7C72E993, 0xB3EE1411, 0x636FBC2A,
         0x2BA9C55D, 0x741831F6, 0xCE5C3E16, 0x9B87931E, 0xAFD6BA33,
         0x6C24CF5C, 0x7A325381, 0x28958677, 0x3B8F4898, 0x6B4BB9AF,
         0xC4BFE81B, 0x66282193, 0x61D809CC, 0xFB21A991, 0x487CAC60,
         0x5DEC8032, 0xEF845D5D, 0xE98575B1, 0xDC262302, 0xEB651B88,
         0x23893E81, 0xD396ACC5, 0x0F6D6FF3, 0x83F44239, 0x2E0B4482,
         0xA4842004, 0x69C8F04A, 0x9E1F9B5E, 0x21C66842, 0xF6E96C9A,
         0x670C9C61, 0xABD388F0, 0x6A51A0D2, 0xD8542F68, 0x960FA728,
         0xAB5133A3, 0x6EEF0B6C, 0x137A3BE4, 0xBA3BF050, 0x7EFB2A98,
         0xA1F1651D, 0x39AF0176, 0x66CA593E, 0x82430E88, 0x8CEE8619,
         0x456F9FB4, 0x7D84A5C3, 0x3B8B5EBE, 0xE06F75D8, 0x85C12073,
         0x401A449F, 0x56C16AA6, 0x4ED3AA62, 0x363F7706, 0x1BFEDF72,
         0x429B023D, 0x37D0D724, 0xD00A1248, 0xDB0FEAD3, 0x49F1C09B,
         0x075372C9, 0x80991B7B, 0x25D479D8, 0xF6E8DEF7, 0xE3FE501A,
         0xB6794C3B, 0x976CE0BD, 0x04C006BA, 0xC1A94FB6, 0x409F60C4,
         0x5E5C9EC2, 0x196A2463, 0x68FB6FAF, 0x3E6C53B5, 0x1339B2EB,
         0x3B52EC6F, 0x6DFC511F, 0x9B30952C, 0xCC814544, 0xAF5EBD09,
         0xBEE3D004, 0xDE334AFD, 0x660F2807, 0x192E4BB3, 0xC0CBA857,
         0x45C8740F, 0xD20B5F39, 0xB9D3FBDB, 0x5579C0BD, 0x1A60320A,
         0xD6A100C6, 0x402C7279, 0x679F25FE, 0xFB1FA3CC, 0x8EA5E9F8,
         0xDB3222F8, 0x3C7516DF, 0xFD616B15, 0x2F501EC8, 0xAD0552AB,
         0x323DB5FA, 0xFD238760, 0x53317B48, 0x3E00DF82, 0x9E5C57BB,
         0xCA6F8CA0, 0x1A87562E, 0xDF1769DB, 0xD542A8F6, 0x287EFFC3,
         0xAC6732C6, 0x8C4F5573, 0x695B27B0, 0xBBCA58C8, 0xE1FFA35D,
         0xB8F011A0, 0x10FA3D98, 0xFD2183B8, 0x4AFCB56C, 0x2DD1D35B,
         0x9A53E479, 0xB6F84565, 0xD28E49BC, 0x4BFB9790, 0xE1DDF2DA,
         0xA4CB7E33, 0x62FB1341, 0xCEE4C6E8, 0xEF20CADA, 0x36774C01,
         0xD07E9EFE, 0x2BF11FB4, 0x95DBDA4D, 0xAE909198, 0xEAAD8E71,
         0x6B93D5A0, 0xD08ED1D0, 0xAFC725E0, 0x8E3C5B2F, 0x8E7594B7,
         0x8FF6E2FB, 0xF2122B64, 0x8888B812, 0x900DF01C, 0x4FAD5EA0,
         0x688FC31C, 0xD1CFF191, 0xB3A8C1AD, 0x2F2F2218, 0xBE0E1777,
         0xEA752DFE, 0x8B021FA1, 0xE5A0CC0F, 0xB56F74E8, 0x18ACF3D6,
         0xCE89E299, 0xB4A84FE0, 0xFD13E0B7, 0x7CC43B81, 0xD2ADA8D9,
         0x165FA266, 0x80957705, 0x93CC7314, 0x211A1477, 0xE6AD2065,
         0x77B5FA86, 0xC75442F5, 0xFB9D35CF, 0xEBCDAF0C, 0x7B3E89A0,
         0xD6411BD3, 0xAE1E7E49, 0x00250E2D, 0x2071B35E, 0x226800BB,
         0x57B8E0AF, 0x2464369B, 0xF009B91E, 0x5563911D, 0x59DFA6AA,
         0x78C14389, 0xD95A537F, 0x207D5BA2, 0x02E5B9C5, 0x83260376,
         0x6295CFA9, 0x11C81968, 0x4E734A41, 0xB3472DCA, 0x7B14A94A,
         0x1B510052, 0x9A532915, 0xD60F573F, 0xBC9BC6E4, 0x2B60A476,
         0x81E67400, 0x08BA6FB5, 0x571BE91F, 0xF296EC6B, 0x2A0DD915,
         0xB6636521, 0xE7B9F9B6, 0xFF34052E, 0xC5855664, 0x53B02D5D,
         0xA99F8FA1, 0x08BA4799, 0x6E85076A};
   private final static int[] KS1 = {0x4B7A70E9, 0xB5B32944, 0xDB75092E,
         0xC4192623, 0xAD6EA6B0, 0x49A7DF7D, 0x9CEE60B8, 0x8FEDB266,
         0xECAA8C71, 0x699A17FF, 0x5664526C, 0xC2B19EE1, 0x193602A5,
         0x75094C29, 0xA0591340, 0xE4183A3E, 0x3F54989A, 0x5B429D65,
         0x6B8FE4D6, 0x99F73FD6, 0xA1D29C07, 0xEFE830F5, 0x4D2D38E6,
         0xF0255DC1, 0x4CDD2086, 0x8470EB26, 0x6382E9C6, 0x021ECC5E,
         0x09686B3F, 0x3EBAEFC9, 0x3C971814, 0x6B6A70A1, 0x687F3584,
         0x52A0E286, 0xB79C5305, 0xAA500737, 0x3E07841C, 0x7FDEAE5C,
         0x8E7D44EC, 0x5716F2B8, 0xB03ADA37, 0xF0500C0D, 0xF01C1F04,
         0x0200B3FF, 0xAE0CF51A, 0x3CB574B2, 0x25837A58, 0xDC0921BD,
         0xD19113F9, 0x7CA92FF6, 0x94324773, 0x22F54701, 0x3AE5E581,
         0x37C2DADC, 0xC8B57634, 0x9AF3DDA7, 0xA9446146, 0x0FD0030E,
         0xECC8C73E, 0xA4751E41, 0xE238CD99, 0x3BEA0E2F, 0x3280BBA1,
         0x183EB331, 0x4E548B38, 0x4F6DB908, 0x6F420D03, 0xF60A04BF,
         0x2CB81290, 0x24977C79, 0x5679B072, 0xBCAF89AF, 0xDE9A771F,
         0xD9930810, 0xB38BAE12, 0xDCCF3F2E, 0x5512721F, 0x2E6B7124,
         0x501ADDE6, 0x9F84CD87, 0x7A584718, 0x7408DA17, 0xBC9F9ABC,
         0xE94B7D8C, 0xEC7AEC3A, 0xDB851DFA, 0x63094366, 0xC464C3D2,
         0xEF1C1847, 0x3215D908, 0xDD433B37, 0x24C2BA16, 0x12A14D43,
         0x2A65C451, 0x50940002, 0x133AE4DD, 0x71DFF89E, 0x10314E55,
         0x81AC77D6, 0x5F11199B, 0x043556F1, 0xD7A3C76B, 0x3C11183B,
         0x5924A509, 0xF28FE6ED, 0x97F1FBFA, 0x9EBABF2C, 0x1E153C6E,
         0x86E34570, 0xEAE96FB1, 0x860E5E0A, 0x5A3E2AB3, 0x771FE71C,
         0x4E3D06FA, 0x2965DCB9, 0x99E71D0F, 0x803E89D6, 0x5266C825,
         0x2E4CC978, 0x9C10B36A, 0xC6150EBA, 0x94E2EA78, 0xA5FC3C53,
         0x1E0A2DF4, 0xF2F74EA7, 0x361D2B3D, 0x1939260F, 0x19C27960,
         0x5223A708, 0xF71312B6, 0xEBADFE6E, 0xEAC31F66, 0xE3BC4595,
         0xA67BC883, 0xB17F37D1, 0x018CFF28, 0xC332DDEF, 0xBE6C5AA5,
         0x65582185, 0x68AB9802, 0xEECEA50F, 0xDB2F953B, 0x2AEF7DAD,
         0x5B6E2F84, 0x1521B628, 0x29076170, 0xECDD4775, 0x619F1510,
         0x13CCA830, 0xEB61BD96, 0x0334FE1E, 0xAA0363CF, 0xB5735C90,
         0x4C70A239, 0xD59E9E0B, 0xCBAADE14, 0xEECC86BC, 0x60622CA7,
         0x9CAB5CAB, 0xB2F3846E, 0x648B1EAF, 0x19BDF0CA, 0xA02369B9,
         0x655ABB50, 0x40685A32, 0x3C2AB4B3, 0x319EE9D5, 0xC021B8F7,
         0x9B540B19, 0x875FA099, 0x95F7997E, 0x623D7DA8, 0xF837889A,
         0x97E32D77, 0x11ED935F, 0x16681281, 0x0E358829, 0xC7E61FD6,
         0x96DEDFA1, 0x7858BA99, 0x57F584A5, 0x1B227263, 0x9B83C3FF,
         0x1AC24696, 0xCDB30AEB, 0x532E3054, 0x8FD948E4, 0x6DBC3128,
         0x58EBF2EF, 0x34C6FFEA, 0xFE28ED61, 0xEE7C3C73, 0x5D4A14D9,
         0xE864B7E3, 0x42105D14, 0x203E13E0, 0x45EEE2B6, 0xA3AAABEA,
         0xDB6C4F15, 0xFACB4FD0, 0xC742F442, 0xEF6ABBB5, 0x654F3B1D,
         0x41CD2105, 0xD81E799E, 0x86854DC7, 0xE44B476A, 0x3D816250,
         0xCF62A1F2, 0x5B8D2646, 0xFC8883A0, 0xC1C7B6A3, 0x7F1524C3,
         0x69CB7492, 0x47848A0B, 0x5692B285, 0x095BBF00, 0xAD19489D,
         0x1462B174, 0x23820E00, 0x58428D2A, 0x0C55F5EA, 0x1DADF43E,
         0x233F7061, 0x3372F092, 0x8D937E41, 0xD65FECF1, 0x6C223BDB,
         0x7CDE3759, 0xCBEE7460, 0x4085F2A7, 0xCE77326E, 0xA6078084,
         0x19F8509E, 0xE8EFD855, 0x61D99735, 0xA969A7AA, 0xC50C06C2,
         0x5A04ABFC, 0x800BCADC, 0x9E447A2E, 0xC3453484, 0xFDD56705,
         0x0E1E9EC9, 0xDB73DBD3, 0x105588CD, 0x675FDA79, 0xE3674340,
         0xC5C43465, 0x713E38D8, 0x3D28F89E, 0xF16DFF20, 0x153E21E7,
         0x8FB03D4A, 0xE6E39F2B, 0xDB83ADF7};
   private final static int[] KS2 = {0xE93D5A68, 0x948140F7, 0xF64C261C,
         0x94692934, 0x411520F7, 0x7602D4F7, 0xBCF46B2E, 0xD4A20068,
         0xD4082471, 0x3320F46A, 0x43B7D4B7, 0x500061AF, 0x1E39F62E,
         0x97244546, 0x14214F74, 0xBF8B8840, 0x4D95FC1D, 0x96B591AF,
         0x70F4DDD3, 0x66A02F45, 0xBFBC09EC, 0x03BD9785, 0x7FAC6DD0,
         0x31CB8504, 0x96EB27B3, 0x55FD3941, 0xDA2547E6, 0xABCA0A9A,
         0x28507825, 0x530429F4, 0x0A2C86DA, 0xE9B66DFB, 0x68DC1462,
         0xD7486900, 0x680EC0A4, 0x27A18DEE, 0x4F3FFEA2, 0xE887AD8C,
         0xB58CE006, 0x7AF4D6B6, 0xAACE1E7C, 0xD3375FEC, 0xCE78A399,
         0x406B2A42, 0x20FE9E35, 0xD9F385B9, 0xEE39D7AB, 0x3B124E8B,
         0x1DC9FAF7, 0x4B6D1856, 0x26A36631, 0xEAE397B2, 0x3A6EFA74,
         0xDD5B4332, 0x6841E7F7, 0xCA7820FB, 0xFB0AF54E, 0xD8FEB397,
         0x454056AC, 0xBA489527, 0x55533A3A, 0x20838D87, 0xFE6BA9B7,
         0xD096954B, 0x55A867BC, 0xA1159A58, 0xCCA92963, 0x99E1DB33,
         0xA62A4A56, 0x3F3125F9, 0x5EF47E1C, 0x9029317C, 0xFDF8E802,
         0x04272F70, 0x80BB155C, 0x05282CE3, 0x95C11548, 0xE4C66D22,
         0x48C1133F, 0xC70F86DC, 0x07F9C9EE, 0x41041F0F, 0x404779A4,
         0x5D886E17, 0x325F51EB, 0xD59BC0D1, 0xF2BCC18F, 0x41113564,
         0x257B7834, 0x602A9C60, 0xDFF8E8A3, 0x1F636C1B, 0x0E12B4C2,
         0x02E1329E, 0xAF664FD1, 0xCAD18115, 0x6B2395E0, 0x333E92E1,
         0x3B240B62, 0xEEBEB922, 0x85B2A20E, 0xE6BA0D99, 0xDE720C8C,
         0x2DA2F728, 0xD0127845, 0x95B794FD, 0x647D0862, 0xE7CCF5F0,
         0x5449A36F, 0x877D48FA, 0xC39DFD27, 0xF33E8D1E, 0x0A476341,
         0x992EFF74, 0x3A6F6EAB, 0xF4F8FD37, 0xA812DC60, 0xA1EBDDF8,
         0x991BE14C, 0xDB6E6B0D, 0xC67B5510, 0x6D672C37, 0x2765D43B,
         0xDCD0E804, 0xF1290DC7, 0xCC00FFA3, 0xB5390F92, 0x690FED0B,
         0x667B9FFB, 0xCEDB7D9C, 0xA091CF0B, 0xD9155EA3, 0xBB132F88,
         0x515BAD24, 0x7B9479BF, 0x763BD6EB, 0x37392EB3, 0xCC115979,
         0x8026E297, 0xF42E312D, 0x6842ADA7, 0xC66A2B3B, 0x12754CCC,
         0x782EF11C, 0x6A124237, 0xB79251E7, 0x06A1BBE6, 0x4BFB6350,
         0x1A6B1018, 0x11CAEDFA, 0x3D25BDD8, 0xE2E1C3C9, 0x44421659,
         0x0A121386, 0xD90CEC6E, 0xD5ABEA2A, 0x64AF674E, 0xDA86A85F,
         0xBEBFE988, 0x64E4C3FE, 0x9DBC8057, 0xF0F7C086, 0x60787BF8,
         0x6003604D, 0xD1FD8346, 0xF6381FB0, 0x7745AE04, 0xD736FCCC,
         0x83426B33, 0xF01EAB71, 0xB0804187, 0x3C005E5F, 0x77A057BE,
         0xBDE8AE24, 0x55464299, 0xBF582E61, 0x4E58F48F, 0xF2DDFDA2,
         0xF474EF38, 0x8789BDC2, 0x5366F9C3, 0xC8B38E74, 0xB475F255,
         0x46FCD9B9, 0x7AEB2661, 0x8B1DDF84, 0x846A0E79, 0x915F95E2,
         0x466E598E, 0x20B45770, 0x8CD55591, 0xC902DE4C, 0xB90BACE1,
         0xBB8205D0, 0x11A86248, 0x7574A99E, 0xB77F19B6, 0xE0A9DC09,
         0x662D09A1, 0xC4324633, 0xE85A1F02, 0x09F0BE8C, 0x4A99A025,
         0x1D6EFE10, 0x1AB93D1D, 0x0BA5A4DF, 0xA186F20F, 0x2868F169,
         0xDCB7DA83, 0x573906FE, 0xA1E2CE9B, 0x4FCD7F52, 0x50115E01,
         0xA70683FA, 0xA002B5C4, 0x0DE6D027, 0x9AF88C27, 0x773F8641,
         0xC3604C06, 0x61A806B5, 0xF0177A28, 0xC0F586E0, 0x006058AA,
         0x30DC7D62, 0x11E69ED7, 0x2338EA63, 0x53C2DD94, 0xC2C21634,
         0xBBCBEE56, 0x90BCB6DE, 0xEBFC7DA1, 0xCE591D76, 0x6F05E409,
         0x4B7C0188, 0x39720A3D, 0x7C927C24, 0x86E3725F, 0x724D9DB9,
         0x1AC15BB4, 0xD39EB8FC, 0xED545578, 0x08FCA5B5, 0xD83D7CD3,
         0x4DAD0FC4, 0x1E50EF5E, 0xB161E6F8, 0xA28514D9, 0x6C51133C,
         0x6FD5C7E7, 0x56E14EC4, 0x362ABFCE, 0xDDC6C837, 0xD79A3234,
         0x92638212, 0x670EFA8E, 0x406000E0};
   private final static int[] KS3 = {0x3A39CE37, 0xD3FAF5CF, 0xABC27737,
         0x5AC52D1B, 0x5CB0679E, 0x4FA33742, 0xD3822740, 0x99BC9BBE,
         0xD5118E9D, 0xBF0F7315, 0xD62D1C7E, 0xC700C47B, 0xB78C1B6B,
         0x21A19045, 0xB26EB1BE, 0x6A366EB4, 0x5748AB2F, 0xBC946E79,
         0xC6A376D2, 0x6549C2C8, 0x530FF8EE, 0x468DDE7D, 0xD5730A1D,
         0x4CD04DC6, 0x2939BBDB, 0xA9BA4650, 0xAC9526E8, 0xBE5EE304,
         0xA1FAD5F0, 0x6A2D519A, 0x63EF8CE2, 0x9A86EE22, 0xC089C2B8,
         0x43242EF6, 0xA51E03AA, 0x9CF2D0A4, 0x83C061BA, 0x9BE96A4D,
         0x8FE51550, 0xBA645BD6, 0x2826A2F9, 0xA73A3AE1, 0x4BA99586,
         0xEF5562E9, 0xC72FEFD3, 0xF752F7DA, 0x3F046F69, 0x77FA0A59,
         0x80E4A915, 0x87B08601, 0x9B09E6AD, 0x3B3EE593, 0xE990FD5A,
         0x9E34D797, 0x2CF0B7D9, 0x022B8B51, 0x96D5AC3A, 0x017DA67D,
         0xD1CF3ED6, 0x7C7D2D28, 0x1F9F25CF, 0xADF2B89B, 0x5AD6B472,
         0x5A88F54C, 0xE029AC71, 0xE019A5E6, 0x47B0ACFD, 0xED93FA9B,
         0xE8D3C48D, 0x283B57CC, 0xF8D56629, 0x79132E28, 0x785F0191,
         0xED756055, 0xF7960E44, 0xE3D35E8C, 0x15056DD4, 0x88F46DBA,
         0x03A16125, 0x0564F0BD, 0xC3EB9E15, 0x3C9057A2, 0x97271AEC,
         0xA93A072A, 0x1B3F6D9B, 0x1E6321F5, 0xF59C66FB, 0x26DCF319,
         0x7533D928, 0xB155FDF5, 0x03563482, 0x8ABA3CBB, 0x28517711,
         0xC20AD9F8, 0xABCC5167, 0xCCAD925F, 0x4DE81751, 0x3830DC8E,
         0x379D5862, 0x9320F991, 0xEA7A90C2, 0xFB3E7BCE, 0x5121CE64,
         0x774FBE32, 0xA8B6E37E, 0xC3293D46, 0x48DE5369, 0x6413E680,
         0xA2AE0810, 0xDD6DB224, 0x69852DFD, 0x09072166, 0xB39A460A,
         0x6445C0DD, 0x586CDECF, 0x1C20C8AE, 0x5BBEF7DD, 0x1B588D40,
         0xCCD2017F, 0x6BB4E3BB, 0xDDA26A7E, 0x3A59FF45, 0x3E350A44,
         0xBCB4CDD5, 0x72EACEA8, 0xFA6484BB, 0x8D6612AE, 0xBF3C6F47,
         0xD29BE463, 0x542F5D9E, 0xAEC2771B, 0xF64E6370, 0x740E0D8D,
         0xE75B1357, 0xF8721671, 0xAF537D5D, 0x4040CB08, 0x4EB4E2CC,
         0x34D2466A, 0x0115AF84, 0xE1B00428, 0x95983A1D, 0x06B89FB4,
         0xCE6EA048, 0x6F3F3B82, 0x3520AB82, 0x011A1D4B, 0x277227F8,
         0x611560B1, 0xE7933FDC, 0xBB3A792B, 0x344525BD, 0xA08839E1,
         0x51CE794B, 0x2F32C9B7, 0xA01FBAC9, 0xE01CC87E, 0xBCC7D1F6,
         0xCF0111C3, 0xA1E8AAC7, 0x1A908749, 0xD44FBD9A, 0xD0DADECB,
         0xD50ADA38, 0x0339C32A, 0xC6913667, 0x8DF9317C, 0xE0B12B4F,
         0xF79E59B7, 0x43F5BB3A, 0xF2D519FF, 0x27D9459C, 0xBF97222C,
         0x15E6FC2A, 0x0F91FC71, 0x9B941525, 0xFAE59361, 0xCEB69CEB,
         0xC2A86459, 0x12BAA8D1, 0xB6C1075E, 0xE3056A0C, 0x10D25065,
         0xCB03A442, 0xE0EC6E0E, 0x1698DB3B, 0x4C98A0BE, 0x3278E964,
         0x9F1F9532, 0xE0D392DF, 0xD3A0342B, 0x8971F21E, 0x1B0A7441,
         0x4BA3348C, 0xC5BE7120, 0xC37632D8, 0xDF359F8D, 0x9B992F2E,
         0xE60B6F47, 0x0FE3F11D, 0xE54CDA54, 0x1EDAD891, 0xCE6279CF,
         0xCD3E7E6F, 0x1618B166, 0xFD2C1D05, 0x848FD2C5, 0xF6FB2299,
         0xF523F357, 0xA6327623, 0x93A83531, 0x56CCCD02, 0xACF08162,
         0x5A75EBB5, 0x6E163697, 0x88D273CC, 0xDE966292, 0x81B949D0,
         0x4C50901B, 0x71C65614, 0xE6C6C7BD, 0x327A140A, 0x45E1D006,
         0xC3F27B9A, 0xC9AA53FD, 0x62A80F00, 0xBB25BFE2, 0x35BDD2F6,
         0x71126905, 0xB2040222, 0xB6CBCF7C, 0xCD769C2B, 0x53113EC0,
         0x1640E3D3, 0x38ABBD60, 0x2547ADF0, 0xBA38209C, 0xF746CE76,
         0x77AFA1C5, 0x20756060, 0x85CBFE4E, 0x8AE88DD8, 0x7AAAF9B0,
         0x4CF9AA7E, 0x1948C25C, 0x02FB8A8C, 0x01C36AE4, 0xD6EBE1F9,
         0x90D4F869, 0xA65CDEA0, 0x3F09252D, 0xC208E69F, 0xB74E6132,
         0xCE77E25B, 0x578FDFE3, 0x3AC372E6};
   //====================================
   // Useful constants
   //====================================
   private static final int ROUNDS = 16;
   private static final int BLOCK_SIZE = 8; // bytes = 64 bits
   private static final int SBOX_SK = 256;
   private static final int P_SZ = ROUNDS + 2;
   private final int[] S0, S1, S2, S3; // the s-boxes
   private final int[] P; // the p-array
   private boolean encrypting = false;
   private byte[] workingKey = null;
   public BlowfishEngine()
   {
      S0 = new int[SBOX_SK];
      S1 = new int[SBOX_SK];
      S2 = new int[SBOX_SK];
      S3 = new int[SBOX_SK];
      P = new int[P_SZ];
   }
   /**
    * initialise a Blowfish cipher.
    *
    * @param forEncryption
    *            whether or not we are for encryption.
    * @param params
    *            the parameters required to set up the cipher.
    * @exception IllegalArgumentException
    *                if the params argument is inappropriate.
    */
   public void init(boolean encrypting, byte[] key)
   {
      this.encrypting = encrypting;
      this.workingKey = key;
      setKey(this.workingKey);
      return;
   }
   public String getAlgorithmName()
   {
      return "Blowfish";
   }
   public final int processBlock(byte[] in, int inOff, byte[] out, int outOff)
         throws IOException
   {
      if (workingKey == null)
      {
         throw new IllegalStateException("Blowfish not initialised");
      }
      if ((inOff + BLOCK_SIZE) > in.length)
      {
         throw new IOException("input buffer too short");
      }
      if ((outOff + BLOCK_SIZE) > out.length)
      {
         throw new IOException("output buffer too short");
      }
      if (encrypting)
      {
         encryptBlock(in, inOff, out, outOff);
      }
      else
      {
         decryptBlock(in, inOff, out, outOff);
      }
      return BLOCK_SIZE;
   }
   public void reset()
   {
   }
   public int getBlockSize()
   {
      return BLOCK_SIZE;
   }
   //==================================
   // Private Implementation
   //==================================
   private int F(int x)
   {
      return (((S0[(x >>> 24)] + S1[(x >>> 16) & 0xff]) ^ S2[(x >>> 8) & 0xff]) + S3[x & 0xff]);
   }
   /**
    * apply the encryption cycle to each value pair in the table.
    */
   private void processTable(int xl, int xr, int[] table)
   {
      int size = table.length;
      for (int s = 0; s < size; s += 2)
      {
         xl ^= P[0];
         for (int i = 1; i < ROUNDS; i += 2)
         {
            xr ^= F(xl) ^ P[i];
            xl ^= F(xr) ^ P[i + 1];
         }
         xr ^= P[ROUNDS + 1];
         table[s] = xr;
         table[s + 1] = xl;
         xr = xl; // end of cycle swap
         xl = table[s];
      }
   }
   private void setKey(byte[] key)
   {
      /*
       * - comments are from _Applied Crypto_, Schneier, p338 please be
       * careful comparing the two, AC numbers the arrays from 1, the
       * enclosed code from 0.
       *
       * (1) Initialise the S-boxes and the P-array, with a fixed string This
       * string contains the hexadecimal digits of pi (3.141...)
       */
      System.arraycopy(KS0, 0, S0, 0, SBOX_SK);
      System.arraycopy(KS1, 0, S1, 0, SBOX_SK);
      System.arraycopy(KS2, 0, S2, 0, SBOX_SK);
      System.arraycopy(KS3, 0, S3, 0, SBOX_SK);
      System.arraycopy(KP, 0, P, 0, P_SZ);
      /*
       * (2) Now, XOR P[0] with the first 32 bits of the key, XOR P[1] with
       * the second 32-bits of the key, and so on for all bits of the key (up
       * to P[17]). Repeatedly cycle through the key bits until the entire
       * P-array has been XOR-ed with the key bits
       */
      int keyLength = key.length;
      int keyIndex = 0;
      for (int i = 0; i < P_SZ; i++)
      {
         // get the 32 bits of the key, in 4 * 8 bit chunks
         int data = 0x0000000;
         for (int j = 0; j < 4; j++)
         {
            // create a 32 bit block
            data = (data << 8) | (key[keyIndex++] & 0xff);
            // wrap when we get to the end of the key
            if (keyIndex >= keyLength)
            {
               keyIndex = 0;
            }
         }
         // XOR the newly created 32 bit chunk onto the P-array
         P[i] ^= data;
      }
      /*
       * (3) Encrypt the all-zero string with the Blowfish algorithm, using
       * the subkeys described in (1) and (2)
       *
       * (4) Replace P1 and P2 with the output of step (3)
       *
       * (5) Encrypt the output of step(3) using the Blowfish algorithm, with
       * the modified subkeys.
       *
       * (6) Replace P3 and P4 with the output of step (5)
       *
       * (7) Continue the process, replacing all elements of the P-array and
       * then all four S-boxes in order, with the output of the continuously
       * changing Blowfish algorithm
       */
      processTable(0, 0, P);
      processTable(P[P_SZ - 2], P[P_SZ - 1], S0);
      processTable(S0[SBOX_SK - 2], S0[SBOX_SK - 1], S1);
      processTable(S1[SBOX_SK - 2], S1[SBOX_SK - 1], S2);
      processTable(S2[SBOX_SK - 2], S2[SBOX_SK - 1], S3);
   }
   


   /**
    * Encrypt the given input starting at the given offset and place the
    * result in the provided buffer starting at the given offset. The input
    * will be an exact multiple of our blocksize.
    */
   private void encryptBlock(byte[] src, int srcIndex, byte[] dst, int dstIndex)
   {
      int xl = BytesTo32bits(src, srcIndex);
      int xr = BytesTo32bits(src, srcIndex + 4);
      xl ^= P[0];
      for (int i = 1; i < ROUNDS; i += 2)
      {
         xr ^= F(xl) ^ P[i];
         xl ^= F(xr) ^ P[i + 1];
      }
      xr ^= P[ROUNDS + 1];
      Bits32ToBytes(xr, dst, dstIndex);
      Bits32ToBytes(xl, dst, dstIndex + 4);
   }
   /**
    * Decrypt the given input starting at the given offset and place the
    * result in the provided buffer starting at the given offset. The input
    * will be an exact multiple of our blocksize.
    */
   private void decryptBlock(byte[] src, int srcIndex, byte[] dst, int dstIndex)
   {
      int xl = BytesTo32bits(src, srcIndex);
      int xr = BytesTo32bits(src, srcIndex + 4);
      xl ^= P[ROUNDS + 1];
      for (int i = ROUNDS; i > 0; i -= 2)
      {
         xr ^= F(xl) ^ P[i];
         xl ^= F(xr) ^ P[i - 1];
      }
      xr ^= P[0];
      Bits32ToBytes(xr, dst, dstIndex);
      Bits32ToBytes(xl, dst, dstIndex + 4);
   }
   private int BytesTo32bits(byte[] b, int i)
   {
      return ((b[i+3]   & 0xff) << 24) |
      ((b[i+2] & 0xff) << 16) |
      ((b[i+1] & 0xff) << 8) |
      ((b[i] & 0xff));
   }
   private void Bits32ToBytes(int in, byte[] b, int offset)
   {
      b[offset] = (byte)in;
      b[offset + 1] = (byte)(in >> 8);
      b[offset + 2] = (byte)(in >> 16);
      b[offset + 3]     = (byte)(in >> 24);
   }
}