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/**
 * Copyright: Copyright (C) Thomas Dixon 2008. All rights reserved.
 * License:   BSD style: $(LICENSE)
 * Authors:   Thomas Dixon
 *
 * Note: This probably needs optimized.
 */

module tango.util.cipher.Blowfish;

private import tango.util.cipher.Cipher;

/** Implementation of the Blowfish cipher designed by Bruce Schneier. */
class Blowfish : BlockCipher
{
    private
    {
        enum uint[1024] S_INIT = [
            0xd1310ba6u, 0x98dfb5acu, 0x2ffd72dbu, 0xd01adfb7u, 0xb8e1afedu, 0x6a267e96u,
            0xba7c9045u, 0xf12c7f99u, 0x24a19947u, 0xb3916cf7u, 0x0801f2e2u, 0x858efc16u,
            0x636920d8u, 0x71574e69u, 0xa458fea3u, 0xf4933d7eu, 0x0d95748fu, 0x728eb658u,
            0x718bcd58u, 0x82154aeeu, 0x7b54a41du, 0xc25a59b5u, 0x9c30d539u, 0x2af26013u,
            0xc5d1b023u, 0x286085f0u, 0xca417918u, 0xb8db38efu, 0x8e79dcb0u, 0x603a180eu,
            0x6c9e0e8bu, 0xb01e8a3eu, 0xd71577c1u, 0xbd314b27u, 0x78af2fdau, 0x55605c60u,
            0xe65525f3u, 0xaa55ab94u, 0x57489862u, 0x63e81440u, 0x55ca396au, 0x2aab10b6u,
            0xb4cc5c34u, 0x1141e8ceu, 0xa15486afu, 0x7c72e993u, 0xb3ee1411u, 0x636fbc2au,
            0x2ba9c55du, 0x741831f6u, 0xce5c3e16u, 0x9b87931eu, 0xafd6ba33u, 0x6c24cf5cu,
            0x7a325381u, 0x28958677u, 0x3b8f4898u, 0x6b4bb9afu, 0xc4bfe81bu, 0x66282193u,
            0x61d809ccu, 0xfb21a991u, 0x487cac60u, 0x5dec8032u, 0xef845d5du, 0xe98575b1u,
            0xdc262302u, 0xeb651b88u, 0x23893e81u, 0xd396acc5u, 0x0f6d6ff3u, 0x83f44239u,
            0x2e0b4482u, 0xa4842004u, 0x69c8f04au, 0x9e1f9b5eu, 0x21c66842u, 0xf6e96c9au,
            0x670c9c61u, 0xabd388f0u, 0x6a51a0d2u, 0xd8542f68u, 0x960fa728u, 0xab5133a3u,
            0x6eef0b6cu, 0x137a3be4u, 0xba3bf050u, 0x7efb2a98u, 0xa1f1651du, 0x39af0176u,
            0x66ca593eu, 0x82430e88u, 0x8cee8619u, 0x456f9fb4u, 0x7d84a5c3u, 0x3b8b5ebeu,
            0xe06f75d8u, 0x85c12073u, 0x401a449fu, 0x56c16aa6u, 0x4ed3aa62u, 0x363f7706u,
            0x1bfedf72u, 0x429b023du, 0x37d0d724u, 0xd00a1248u, 0xdb0fead3u, 0x49f1c09bu,
            0x075372c9u, 0x80991b7bu, 0x25d479d8u, 0xf6e8def7u, 0xe3fe501au, 0xb6794c3bu,
            0x976ce0bdu, 0x04c006bau, 0xc1a94fb6u, 0x409f60c4u, 0x5e5c9ec2u, 0x196a2463u,
            0x68fb6fafu, 0x3e6c53b5u, 0x1339b2ebu, 0x3b52ec6fu, 0x6dfc511fu, 0x9b30952cu,
            0xcc814544u, 0xaf5ebd09u, 0xbee3d004u, 0xde334afdu, 0x660f2807u, 0x192e4bb3u,
            0xc0cba857u, 0x45c8740fu, 0xd20b5f39u, 0xb9d3fbdbu, 0x5579c0bdu, 0x1a60320au,
            0xd6a100c6u, 0x402c7279u, 0x679f25feu, 0xfb1fa3ccu, 0x8ea5e9f8u, 0xdb3222f8u,
            0x3c7516dfu, 0xfd616b15u, 0x2f501ec8u, 0xad0552abu, 0x323db5fau, 0xfd238760u,
            0x53317b48u, 0x3e00df82u, 0x9e5c57bbu, 0xca6f8ca0u, 0x1a87562eu, 0xdf1769dbu,
            0xd542a8f6u, 0x287effc3u, 0xac6732c6u, 0x8c4f5573u, 0x695b27b0u, 0xbbca58c8u,
            0xe1ffa35du, 0xb8f011a0u, 0x10fa3d98u, 0xfd2183b8u, 0x4afcb56cu, 0x2dd1d35bu,
            0x9a53e479u, 0xb6f84565u, 0xd28e49bcu, 0x4bfb9790u, 0xe1ddf2dau, 0xa4cb7e33u,
            0x62fb1341u, 0xcee4c6e8u, 0xef20cadau, 0x36774c01u, 0xd07e9efeu, 0x2bf11fb4u,
            0x95dbda4du, 0xae909198u, 0xeaad8e71u, 0x6b93d5a0u, 0xd08ed1d0u, 0xafc725e0u,
            0x8e3c5b2fu, 0x8e7594b7u, 0x8ff6e2fbu, 0xf2122b64u, 0x8888b812u, 0x900df01cu,
            0x4fad5ea0u, 0x688fc31cu, 0xd1cff191u, 0xb3a8c1adu, 0x2f2f2218u, 0xbe0e1777u,
            0xea752dfeu, 0x8b021fa1u, 0xe5a0cc0fu, 0xb56f74e8u, 0x18acf3d6u, 0xce89e299u,
            0xb4a84fe0u, 0xfd13e0b7u, 0x7cc43b81u, 0xd2ada8d9u, 0x165fa266u, 0x80957705u,
            0x93cc7314u, 0x211a1477u, 0xe6ad2065u, 0x77b5fa86u, 0xc75442f5u, 0xfb9d35cfu,
            0xebcdaf0cu, 0x7b3e89a0u, 0xd6411bd3u, 0xae1e7e49u, 0x00250e2du, 0x2071b35eu,
            0x226800bbu, 0x57b8e0afu, 0x2464369bu, 0xf009b91eu, 0x5563911du, 0x59dfa6aau,
            0x78c14389u, 0xd95a537fu, 0x207d5ba2u, 0x02e5b9c5u, 0x83260376u, 0x6295cfa9u,
            0x11c81968u, 0x4e734a41u, 0xb3472dcau, 0x7b14a94au, 0x1b510052u, 0x9a532915u,
            0xd60f573fu, 0xbc9bc6e4u, 0x2b60a476u, 0x81e67400u, 0x08ba6fb5u, 0x571be91fu,
            0xf296ec6bu, 0x2a0dd915u, 0xb6636521u, 0xe7b9f9b6u, 0xff34052eu, 0xc5855664u,
            0x53b02d5du, 0xa99f8fa1u, 0x08ba4799u, 0x6e85076au,
            
            0x4b7a70e9u, 0xb5b32944u, 0xdb75092eu, 0xc4192623u, 0xad6ea6b0u, 0x49a7df7du,
            0x9cee60b8u, 0x8fedb266u, 0xecaa8c71u, 0x699a17ffu, 0x5664526cu, 0xc2b19ee1u,
            0x193602a5u, 0x75094c29u, 0xa0591340u, 0xe4183a3eu, 0x3f54989au, 0x5b429d65u,
            0x6b8fe4d6u, 0x99f73fd6u, 0xa1d29c07u, 0xefe830f5u, 0x4d2d38e6u, 0xf0255dc1u,
            0x4cdd2086u, 0x8470eb26u, 0x6382e9c6u, 0x021ecc5eu, 0x09686b3fu, 0x3ebaefc9u,
            0x3c971814u, 0x6b6a70a1u, 0x687f3584u, 0x52a0e286u, 0xb79c5305u, 0xaa500737u,
            0x3e07841cu, 0x7fdeae5cu, 0x8e7d44ecu, 0x5716f2b8u, 0xb03ada37u, 0xf0500c0du,
            0xf01c1f04u, 0x0200b3ffu, 0xae0cf51au, 0x3cb574b2u, 0x25837a58u, 0xdc0921bdu,
            0xd19113f9u, 0x7ca92ff6u, 0x94324773u, 0x22f54701u, 0x3ae5e581u, 0x37c2dadcu,
            0xc8b57634u, 0x9af3dda7u, 0xa9446146u, 0x0fd0030eu, 0xecc8c73eu, 0xa4751e41u,
            0xe238cd99u, 0x3bea0e2fu, 0x3280bba1u, 0x183eb331u, 0x4e548b38u, 0x4f6db908u,
            0x6f420d03u, 0xf60a04bfu, 0x2cb81290u, 0x24977c79u, 0x5679b072u, 0xbcaf89afu,
            0xde9a771fu, 0xd9930810u, 0xb38bae12u, 0xdccf3f2eu, 0x5512721fu, 0x2e6b7124u,
            0x501adde6u, 0x9f84cd87u, 0x7a584718u, 0x7408da17u, 0xbc9f9abcu, 0xe94b7d8cu,
            0xec7aec3au, 0xdb851dfau, 0x63094366u, 0xc464c3d2u, 0xef1c1847u, 0x3215d908u,
            0xdd433b37u, 0x24c2ba16u, 0x12a14d43u, 0x2a65c451u, 0x50940002u, 0x133ae4ddu,
            0x71dff89eu, 0x10314e55u, 0x81ac77d6u, 0x5f11199bu, 0x043556f1u, 0xd7a3c76bu,
            0x3c11183bu, 0x5924a509u, 0xf28fe6edu, 0x97f1fbfau, 0x9ebabf2cu, 0x1e153c6eu,
            0x86e34570u, 0xeae96fb1u, 0x860e5e0au, 0x5a3e2ab3u, 0x771fe71cu, 0x4e3d06fau,
            0x2965dcb9u, 0x99e71d0fu, 0x803e89d6u, 0x5266c825u, 0x2e4cc978u, 0x9c10b36au,
            0xc6150ebau, 0x94e2ea78u, 0xa5fc3c53u, 0x1e0a2df4u, 0xf2f74ea7u, 0x361d2b3du,
            0x1939260fu, 0x19c27960u, 0x5223a708u, 0xf71312b6u, 0xebadfe6eu, 0xeac31f66u,
            0xe3bc4595u, 0xa67bc883u, 0xb17f37d1u, 0x018cff28u, 0xc332ddefu, 0xbe6c5aa5u,
            0x65582185u, 0x68ab9802u, 0xeecea50fu, 0xdb2f953bu, 0x2aef7dadu, 0x5b6e2f84u,
            0x1521b628u, 0x29076170u, 0xecdd4775u, 0x619f1510u, 0x13cca830u, 0xeb61bd96u,
            0x0334fe1eu, 0xaa0363cfu, 0xb5735c90u, 0x4c70a239u, 0xd59e9e0bu, 0xcbaade14u,
            0xeecc86bcu, 0x60622ca7u, 0x9cab5cabu, 0xb2f3846eu, 0x648b1eafu, 0x19bdf0cau,
            0xa02369b9u, 0x655abb50u, 0x40685a32u, 0x3c2ab4b3u, 0x319ee9d5u, 0xc021b8f7u,
            0x9b540b19u, 0x875fa099u, 0x95f7997eu, 0x623d7da8u, 0xf837889au, 0x97e32d77u,
            0x11ed935fu, 0x16681281u, 0x0e358829u, 0xc7e61fd6u, 0x96dedfa1u, 0x7858ba99u,
            0x57f584a5u, 0x1b227263u, 0x9b83c3ffu, 0x1ac24696u, 0xcdb30aebu, 0x532e3054u,
            0x8fd948e4u, 0x6dbc3128u, 0x58ebf2efu, 0x34c6ffeau, 0xfe28ed61u, 0xee7c3c73u,
            0x5d4a14d9u, 0xe864b7e3u, 0x42105d14u, 0x203e13e0u, 0x45eee2b6u, 0xa3aaabeau,
            0xdb6c4f15u, 0xfacb4fd0u, 0xc742f442u, 0xef6abbb5u, 0x654f3b1du, 0x41cd2105u,
            0xd81e799eu, 0x86854dc7u, 0xe44b476au, 0x3d816250u, 0xcf62a1f2u, 0x5b8d2646u,
            0xfc8883a0u, 0xc1c7b6a3u, 0x7f1524c3u, 0x69cb7492u, 0x47848a0bu, 0x5692b285u,
            0x095bbf00u, 0xad19489du, 0x1462b174u, 0x23820e00u, 0x58428d2au, 0x0c55f5eau,
            0x1dadf43eu, 0x233f7061u, 0x3372f092u, 0x8d937e41u, 0xd65fecf1u, 0x6c223bdbu,
            0x7cde3759u, 0xcbee7460u, 0x4085f2a7u, 0xce77326eu, 0xa6078084u, 0x19f8509eu,
            0xe8efd855u, 0x61d99735u, 0xa969a7aau, 0xc50c06c2u, 0x5a04abfcu, 0x800bcadcu,
            0x9e447a2eu, 0xc3453484u, 0xfdd56705u, 0x0e1e9ec9u, 0xdb73dbd3u, 0x105588cdu,
            0x675fda79u, 0xe3674340u, 0xc5c43465u, 0x713e38d8u, 0x3d28f89eu, 0xf16dff20u,
            0x153e21e7u, 0x8fb03d4au, 0xe6e39f2bu, 0xdb83adf7u,
            
            0xe93d5a68u, 0x948140f7u, 0xf64c261cu, 0x94692934u, 0x411520f7u, 0x7602d4f7u,
            0xbcf46b2eu, 0xd4a20068u, 0xd4082471u, 0x3320f46au, 0x43b7d4b7u, 0x500061afu,
            0x1e39f62eu, 0x97244546u, 0x14214f74u, 0xbf8b8840u, 0x4d95fc1du, 0x96b591afu,
            0x70f4ddd3u, 0x66a02f45u, 0xbfbc09ecu, 0x03bd9785u, 0x7fac6dd0u, 0x31cb8504u,
            0x96eb27b3u, 0x55fd3941u, 0xda2547e6u, 0xabca0a9au, 0x28507825u, 0x530429f4u,
            0x0a2c86dau, 0xe9b66dfbu, 0x68dc1462u, 0xd7486900u, 0x680ec0a4u, 0x27a18deeu,
            0x4f3ffea2u, 0xe887ad8cu, 0xb58ce006u, 0x7af4d6b6u, 0xaace1e7cu, 0xd3375fecu,
            0xce78a399u, 0x406b2a42u, 0x20fe9e35u, 0xd9f385b9u, 0xee39d7abu, 0x3b124e8bu,
            0x1dc9faf7u, 0x4b6d1856u, 0x26a36631u, 0xeae397b2u, 0x3a6efa74u, 0xdd5b4332u,
            0x6841e7f7u, 0xca7820fbu, 0xfb0af54eu, 0xd8feb397u, 0x454056acu, 0xba489527u,
            0x55533a3au, 0x20838d87u, 0xfe6ba9b7u, 0xd096954bu, 0x55a867bcu, 0xa1159a58u,
            0xcca92963u, 0x99e1db33u, 0xa62a4a56u, 0x3f3125f9u, 0x5ef47e1cu, 0x9029317cu,
            0xfdf8e802u, 0x04272f70u, 0x80bb155cu, 0x05282ce3u, 0x95c11548u, 0xe4c66d22u,
            0x48c1133fu, 0xc70f86dcu, 0x07f9c9eeu, 0x41041f0fu, 0x404779a4u, 0x5d886e17u,
            0x325f51ebu, 0xd59bc0d1u, 0xf2bcc18fu, 0x41113564u, 0x257b7834u, 0x602a9c60u,
            0xdff8e8a3u, 0x1f636c1bu, 0x0e12b4c2u, 0x02e1329eu, 0xaf664fd1u, 0xcad18115u,
            0x6b2395e0u, 0x333e92e1u, 0x3b240b62u, 0xeebeb922u, 0x85b2a20eu, 0xe6ba0d99u,
            0xde720c8cu, 0x2da2f728u, 0xd0127845u, 0x95b794fdu, 0x647d0862u, 0xe7ccf5f0u,
            0x5449a36fu, 0x877d48fau, 0xc39dfd27u, 0xf33e8d1eu, 0x0a476341u, 0x992eff74u,
            0x3a6f6eabu, 0xf4f8fd37u, 0xa812dc60u, 0xa1ebddf8u, 0x991be14cu, 0xdb6e6b0du,
            0xc67b5510u, 0x6d672c37u, 0x2765d43bu, 0xdcd0e804u, 0xf1290dc7u, 0xcc00ffa3u,
            0xb5390f92u, 0x690fed0bu, 0x667b9ffbu, 0xcedb7d9cu, 0xa091cf0bu, 0xd9155ea3u,
            0xbb132f88u, 0x515bad24u, 0x7b9479bfu, 0x763bd6ebu, 0x37392eb3u, 0xcc115979u,
            0x8026e297u, 0xf42e312du, 0x6842ada7u, 0xc66a2b3bu, 0x12754cccu, 0x782ef11cu,
            0x6a124237u, 0xb79251e7u, 0x06a1bbe6u, 0x4bfb6350u, 0x1a6b1018u, 0x11caedfau,
            0x3d25bdd8u, 0xe2e1c3c9u, 0x44421659u, 0x0a121386u, 0xd90cec6eu, 0xd5abea2au,
            0x64af674eu, 0xda86a85fu, 0xbebfe988u, 0x64e4c3feu, 0x9dbc8057u, 0xf0f7c086u,
            0x60787bf8u, 0x6003604du, 0xd1fd8346u, 0xf6381fb0u, 0x7745ae04u, 0xd736fcccu,
            0x83426b33u, 0xf01eab71u, 0xb0804187u, 0x3c005e5fu, 0x77a057beu, 0xbde8ae24u,
            0x55464299u, 0xbf582e61u, 0x4e58f48fu, 0xf2ddfda2u, 0xf474ef38u, 0x8789bdc2u,
            0x5366f9c3u, 0xc8b38e74u, 0xb475f255u, 0x46fcd9b9u, 0x7aeb2661u, 0x8b1ddf84u,
            0x846a0e79u, 0x915f95e2u, 0x466e598eu, 0x20b45770u, 0x8cd55591u, 0xc902de4cu,
            0xb90bace1u, 0xbb8205d0u, 0x11a86248u, 0x7574a99eu, 0xb77f19b6u, 0xe0a9dc09u,
            0x662d09a1u, 0xc4324633u, 0xe85a1f02u, 0x09f0be8cu, 0x4a99a025u, 0x1d6efe10u,
            0x1ab93d1du, 0x0ba5a4dfu, 0xa186f20fu, 0x2868f169u, 0xdcb7da83u, 0x573906feu,
            0xa1e2ce9bu, 0x4fcd7f52u, 0x50115e01u, 0xa70683fau, 0xa002b5c4u, 0x0de6d027u,
            0x9af88c27u, 0x773f8641u, 0xc3604c06u, 0x61a806b5u, 0xf0177a28u, 0xc0f586e0u,
            0x006058aau, 0x30dc7d62u, 0x11e69ed7u, 0x2338ea63u, 0x53c2dd94u, 0xc2c21634u,
            0xbbcbee56u, 0x90bcb6deu, 0xebfc7da1u, 0xce591d76u, 0x6f05e409u, 0x4b7c0188u,
            0x39720a3du, 0x7c927c24u, 0x86e3725fu, 0x724d9db9u, 0x1ac15bb4u, 0xd39eb8fcu,
            0xed545578u, 0x08fca5b5u, 0xd83d7cd3u, 0x4dad0fc4u, 0x1e50ef5eu, 0xb161e6f8u,
            0xa28514d9u, 0x6c51133cu, 0x6fd5c7e7u, 0x56e14ec4u, 0x362abfceu, 0xddc6c837u,
            0xd79a3234u, 0x92638212u, 0x670efa8eu, 0x406000e0u,
            
            0x3a39ce37u, 0xd3faf5cfu, 0xabc27737u, 0x5ac52d1bu, 0x5cb0679eu, 0x4fa33742u,
            0xd3822740u, 0x99bc9bbeu, 0xd5118e9du, 0xbf0f7315u, 0xd62d1c7eu, 0xc700c47bu,
            0xb78c1b6bu, 0x21a19045u, 0xb26eb1beu, 0x6a366eb4u, 0x5748ab2fu, 0xbc946e79u,
            0xc6a376d2u, 0x6549c2c8u, 0x530ff8eeu, 0x468dde7du, 0xd5730a1du, 0x4cd04dc6u,
            0x2939bbdbu, 0xa9ba4650u, 0xac9526e8u, 0xbe5ee304u, 0xa1fad5f0u, 0x6a2d519au,
            0x63ef8ce2u, 0x9a86ee22u, 0xc089c2b8u, 0x43242ef6u, 0xa51e03aau, 0x9cf2d0a4u,
            0x83c061bau, 0x9be96a4du, 0x8fe51550u, 0xba645bd6u, 0x2826a2f9u, 0xa73a3ae1u,
            0x4ba99586u, 0xef5562e9u, 0xc72fefd3u, 0xf752f7dau, 0x3f046f69u, 0x77fa0a59u,
            0x80e4a915u, 0x87b08601u, 0x9b09e6adu, 0x3b3ee593u, 0xe990fd5au, 0x9e34d797u,
            0x2cf0b7d9u, 0x022b8b51u, 0x96d5ac3au, 0x017da67du, 0xd1cf3ed6u, 0x7c7d2d28u,
            0x1f9f25cfu, 0xadf2b89bu, 0x5ad6b472u, 0x5a88f54cu, 0xe029ac71u, 0xe019a5e6u,
            0x47b0acfdu, 0xed93fa9bu, 0xe8d3c48du, 0x283b57ccu, 0xf8d56629u, 0x79132e28u,
            0x785f0191u, 0xed756055u, 0xf7960e44u, 0xe3d35e8cu, 0x15056dd4u, 0x88f46dbau,
            0x03a16125u, 0x0564f0bdu, 0xc3eb9e15u, 0x3c9057a2u, 0x97271aecu, 0xa93a072au,
            0x1b3f6d9bu, 0x1e6321f5u, 0xf59c66fbu, 0x26dcf319u, 0x7533d928u, 0xb155fdf5u,
            0x03563482u, 0x8aba3cbbu, 0x28517711u, 0xc20ad9f8u, 0xabcc5167u, 0xccad925fu,
            0x4de81751u, 0x3830dc8eu, 0x379d5862u, 0x9320f991u, 0xea7a90c2u, 0xfb3e7bceu,
            0x5121ce64u, 0x774fbe32u, 0xa8b6e37eu, 0xc3293d46u, 0x48de5369u, 0x6413e680u,
            0xa2ae0810u, 0xdd6db224u, 0x69852dfdu, 0x09072166u, 0xb39a460au, 0x6445c0ddu,
            0x586cdecfu, 0x1c20c8aeu, 0x5bbef7ddu, 0x1b588d40u, 0xccd2017fu, 0x6bb4e3bbu,
            0xdda26a7eu, 0x3a59ff45u, 0x3e350a44u, 0xbcb4cdd5u, 0x72eacea8u, 0xfa6484bbu,
            0x8d6612aeu, 0xbf3c6f47u, 0xd29be463u, 0x542f5d9eu, 0xaec2771bu, 0xf64e6370u,
            0x740e0d8du, 0xe75b1357u, 0xf8721671u, 0xaf537d5du, 0x4040cb08u, 0x4eb4e2ccu,
            0x34d2466au, 0x0115af84u, 0xe1b00428u, 0x95983a1du, 0x06b89fb4u, 0xce6ea048u,
            0x6f3f3b82u, 0x3520ab82u, 0x011a1d4bu, 0x277227f8u, 0x611560b1u, 0xe7933fdcu,
            0xbb3a792bu, 0x344525bdu, 0xa08839e1u, 0x51ce794bu, 0x2f32c9b7u, 0xa01fbac9u,
            0xe01cc87eu, 0xbcc7d1f6u, 0xcf0111c3u, 0xa1e8aac7u, 0x1a908749u, 0xd44fbd9au,
            0xd0dadecbu, 0xd50ada38u, 0x0339c32au, 0xc6913667u, 0x8df9317cu, 0xe0b12b4fu,
            0xf79e59b7u, 0x43f5bb3au, 0xf2d519ffu, 0x27d9459cu, 0xbf97222cu, 0x15e6fc2au,
            0x0f91fc71u, 0x9b941525u, 0xfae59361u, 0xceb69cebu, 0xc2a86459u, 0x12baa8d1u,
            0xb6c1075eu, 0xe3056a0cu, 0x10d25065u, 0xcb03a442u, 0xe0ec6e0eu, 0x1698db3bu,
            0x4c98a0beu, 0x3278e964u, 0x9f1f9532u, 0xe0d392dfu, 0xd3a0342bu, 0x8971f21eu,
            0x1b0a7441u, 0x4ba3348cu, 0xc5be7120u, 0xc37632d8u, 0xdf359f8du, 0x9b992f2eu,
            0xe60b6f47u, 0x0fe3f11du, 0xe54cda54u, 0x1edad891u, 0xce6279cfu, 0xcd3e7e6fu,
            0x1618b166u, 0xfd2c1d05u, 0x848fd2c5u, 0xf6fb2299u, 0xf523f357u, 0xa6327623u,
            0x93a83531u, 0x56cccd02u, 0xacf08162u, 0x5a75ebb5u, 0x6e163697u, 0x88d273ccu,
            0xde966292u, 0x81b949d0u, 0x4c50901bu, 0x71c65614u, 0xe6c6c7bdu, 0x327a140au,
            0x45e1d006u, 0xc3f27b9au, 0xc9aa53fdu, 0x62a80f00u, 0xbb25bfe2u, 0x35bdd2f6u,
            0x71126905u, 0xb2040222u, 0xb6cbcf7cu, 0xcd769c2bu, 0x53113ec0u, 0x1640e3d3u,
            0x38abbd60u, 0x2547adf0u, 0xba38209cu, 0xf746ce76u, 0x77afa1c5u, 0x20756060u,
            0x85cbfe4eu, 0x8ae88dd8u, 0x7aaaf9b0u, 0x4cf9aa7eu, 0x1948c25cu, 0x02fb8a8cu,
            0x01c36ae4u, 0xd6ebe1f9u, 0x90d4f869u, 0xa65cdea0u, 0x3f09252du, 0xc208e69fu,
            0xb74e6132u, 0xce77e25bu, 0x578fdfe3u, 0x3ac372e6u
        ];
        
        enum uint[18] P_INIT = [
            0x243f6a88u, 0x85a308d3u, 0x13198a2eu, 0x03707344u, 0xa4093822u, 0x299f31d0u,
            0x082efa98u, 0xec4e6c89u, 0x452821e6u, 0x38d01377u, 0xbe5466cfu, 0x34e90c6cu,
            0xc0ac29b7u, 0xc97c50ddu, 0x3f84d5b5u, 0xb5470917u, 0x9216d5d9u, 0x8979fb1bu
        ];
        
        enum uint BLOCK_SIZE = 8,
                  ROUNDS = 16,
                  SBOX_SIZE = 256,
                  PBOX_SIZE = 18,
                  MAX_KEY_SIZE = 56, // 448 bits
                  MIN_KEY_SIZE = 4; // 32 bits
        uint[18] P;
        uint[256] S0, S1, S2, S3;
        const(ubyte)[] workingKey;
    } // end private

    this() {}
    this(bool encrypt, ubyte[] key) {
        init(encrypt, key);
    }

    @property final override const(char[]) name()
    {
        return "Blowfish";
    }
    
    @property final override const uint blockSize()
    {
        return BLOCK_SIZE;
    }
    
    final void init(bool encrypt, ubyte[] key)
    {
        _encrypt = encrypt;
        
        size_t len = key.length;
        if (len < MIN_KEY_SIZE || len > MAX_KEY_SIZE)
            invalid(name()~": Invalid key length (requires 4-56 bytes)");
        
        workingKey = key;
        
        // Yes, this is ghetto. I know.
        _initialized = true;
        
        setup(workingKey);
        
        if (!_encrypt)
            P.reverse; // Oh yes I did.
    }
    
    private uint F(uint x)
    {
        return (((S0[(x >> 24)] 
                + S1[cast(ubyte)(x >> 16)])
                ^ S2[cast(ubyte)(x >> 8)]) 
                + S3[cast(ubyte)x]);
    }
    
    final override uint update(const(void[]) input_, void[] output_)
    {
        if (!_initialized)
            invalid(name()~": Cipher not initialized.");
        
        ubyte[] input = cast(ubyte[]) input_,
                output = cast(ubyte[]) output_;
                    
        if (input.length < BLOCK_SIZE)
            invalid (name()~": Input buffer too short");
            
        if (output.length < BLOCK_SIZE)
            invalid (name()~": Output buffer too short");
        
        uint xl = ByteConverter.BigEndian.to!(uint)(input[0..4]),
             xr = ByteConverter.BigEndian.to!(uint)(input[4..8]),
             i = 0;
        
        xl ^= P[i++];
        for (; i < ROUNDS;)
        {
            xr ^= F(xl) ^ P[i++];
            xl ^= F(xr) ^ P[i++];
        }
        xr ^= P[i];
  
        ByteConverter.BigEndian.from!(uint)(xr, output[0..4]);
        ByteConverter.BigEndian.from!(uint)(xl, output[4..8]);
        
        return BLOCK_SIZE;
    }
    
    final override void reset()
    {
        setup(workingKey);
    }
    
    private void setup(const(ubyte)[] key)
    {
        S0[] = S_INIT[0..256];
        S1[] = S_INIT[256..512];
        S2[] = S_INIT[512..768];
        S3[] = S_INIT[768..1024];
        P[] = P_INIT[];
        
        uint index = 0;

        for (int i = 0; i < PBOX_SIZE; i++)
        {
            uint x = 0;
            for (int j = 0; j < 4; j++)
            {
                x = (x << 8) | key[index++];
                if (index == key.length)
                    index = 0;
            }
            
            P[i] ^= x;
        }
        
        ubyte[] t = new ubyte[BLOCK_SIZE]; // Initialized to 0's
        for (int i = 0; i < PBOX_SIZE;)
        {
            update(t, t);
            P[i++] = ByteConverter.BigEndian.to!(uint)(t[0..4]);
            P[i++] = ByteConverter.BigEndian.to!(uint)(t[4..8]);
        }
        
        for (int i = 0; i < SBOX_SIZE;)
        {
            update(t, t);
            S0[i++] = ByteConverter.BigEndian.to!(uint)(t[0..4]);
            S0[i++] = ByteConverter.BigEndian.to!(uint)(t[4..8]);
        }
        
        for (int i = 0; i < SBOX_SIZE;)
        {
            update(t, t);
            S1[i++] = ByteConverter.BigEndian.to!(uint)(t[0..4]);
            S1[i++] = ByteConverter.BigEndian.to!(uint)(t[4..8]);
        }
        
        for (int i = 0; i < SBOX_SIZE;)
        {
            update(t, t);
            S2[i++] = ByteConverter.BigEndian.to!(uint)(t[0..4]);
            S2[i++] = ByteConverter.BigEndian.to!(uint)(t[4..8]);
        }
        
        for (int i = 0; i < SBOX_SIZE;)
        {
            update(t, t);
            S3[i++] = ByteConverter.BigEndian.to!(uint)(t[0..4]);
            S3[i++] = ByteConverter.BigEndian.to!(uint)(t[4..8]);
        }
    }
    

}

/** Some Blowfish test vectors from Schneier's site. */
debug (UnitTest)
{
    unittest
    {
        enum immutable(char)[][] test_keys = [
            "0000000000000000",
            "ffffffffffffffff",
            "57686f206973204a6f686e2047616c743f", // I don't know, do you?
            "1111111111111111",
            "0123456789abcdef",
            "1111111111111111",
            "fedcba9876543210"
        ];
             
        enum immutable(char)[][] test_plaintexts = [
            "0000000000000000",
            "ffffffffffffffff",
            "fedcba9876543210",
            "1111111111111111",
            "1111111111111111",
            "0123456789abcdef",
            "0123456789abcdef"
        ];
            
        enum immutable(char)[][] test_ciphertexts = [
            "4ef997456198dd78",
            "51866fd5b85ecb8a",
            "cc91732b8022f684",
            "2466dd878b963c9d",
            "61f9c3802281b096",
            "7d0cc630afda1ec7",
            "0aceab0fc6a0a28d"
        ];
            
        Blowfish t = new Blowfish();
        foreach (uint i, immutable(char)[] test_key; test_keys)
        {
            ubyte[] buffer = new ubyte[t.blockSize];
            char[] result;
            auto key = ByteConverter.hexDecode(test_key);
            
            // Encryption
            t.init(true, key);
            t.update(ByteConverter.hexDecode(test_plaintexts[i]), buffer);
            result = ByteConverter.hexEncode(buffer);
            assert(result == test_ciphertexts[i],
                    t.name~": ("~result~") != ("~test_ciphertexts[i]~")");
        
            // Decryption
            t.init(false, key);
            t.update(ByteConverter.hexDecode(test_ciphertexts[i]), buffer);
            result = ByteConverter.hexEncode(buffer);
            assert(result == test_plaintexts[i],
                    t.name~": ("~result~") != ("~test_plaintexts[i]~")");
        }
    }
}