# This is Crypt/Blowfish_PP.pm which is an implementation of Bruce Schneier's
#   blowfish cryptographic algorithm. I will write some proper docs when I get
#   time....
#   code is (c) copyright Matthew Byng-Maddick <mbm@colondot.net> 2000-2001, and
#   some bits are copyright Bruce Schneier. For more information see his website
#   at http://www.counterpane.com/

=head1 NAME

B<Crypt::Blowfish_PP> - Blowfish encryption algorithm implemented purely in Perl

=head1 SYNOPSIS

C<use Crypt::Blowfish_PP>;

$blowfish=new Crypt::Blowfish_PP($key);

$ciphertextBlock=$blowfish->encrypt($plaintextBlock);

$plaintextBlock=$blowfish->decrypt($ciphertextBlock);

=head1 DESCRIPTION

The B<Crypt::Blowfish_PP> module provides for users to use the Blowfish encryption
algorithm in perl. The implementation is entirely Object Oriented, as there is
quite a lot of context inherent in making blowfish as fast as it is. The key is
anywhere between 64 and 448 bits (8 and 56 bytes), and should be passed as a
packed string. The transformation itself is a 16-round Feistel Network, and
operates on a 64 bit block.

Object methods for the Crypt::Blowfish_PP module:

=cut
package Crypt::Blowfish_PP;

use strict;
use vars qw($VERSION);

$VERSION="1.12";

=head2 B<new>(I<key>)

The B<new>() method initialises a blowfish object with the key that is passed.
This is the slow part of doing a blowfish encryption or decryption, as it
initialises the 18 p-boxes and the 1024 s-boxes that are used for the algorithm.
It will return undef if the key is not of a valid length.

=cut

sub new
	{
	my $pack=shift;
	my $key=shift;
	return undef if(!defined($key));
	my %h=(
		p_boxes	=>
			[
			0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344,
			0xa4093822, 0x299f31d0, 0x082efa98, 0xec4e6c89,
			0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,
			0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917,
			0x9216d5d9, 0x8979fb1b
			],
		s_boxes =>
			[
				[
				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
				],
				[
				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, 0x61d9###########5,
				0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc,
				0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9,
				0xdb73dbd3, 0x105588cd, 0x675fda79, 0xe3674340,
				0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20,
				0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7
				],
				[
				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
				],
				[
				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
				]
			]
		);
	my $keylen=length($key);
	return undef if(($keylen < 8) || ($keylen > 56));
	my @keybytes=split//,$key;
	my $b;
	for $b (@keybytes)
		{
		$b=unpack("C",$b);
		}
	my $j=0;
	my $i=0;
	my($l,$r)=(0,0);

	# BEGIN PROCESS OF SETTING UP S & P-BOXES FOR THE KEY
	for ($i=0;$i<18;$i++)
		{
		my $temp=	($keybytes[$j]<<24) +
				($keybytes[($j+1)%($keylen)]<<16) +
				($keybytes[($j+2)%($keylen)]<<8) +
				($keybytes[($j+3)%($keylen)]) ;
		$h{"p_boxes"}->[$i]^=$temp;
		$j=($j+4)%($keylen);
		}
	for ($i=0;$i<18;$i+=2)
		{
		($l,$r)=crypt_block(\%h,$l,$r,0);
		$h{"p_boxes"}->[$i]=$l;
		$h{"p_boxes"}->[$i+1]=$r;
		}
	for $i (0..3)
		{
		for($j=0;$j<256;$j+=2)
			{
			($l,$r)=crypt_block(\%h,$l,$r,0);
			$h{"s_boxes"}->[$i]->[$j]=$l;
			$h{"s_boxes"}->[$i]->[$j+1]=$r;
			}
		}
	# S-BOXES AND P-BOXES NOW SET UP, NEED NO LONGER CARE
	# ABOUT ACTUAL KEY
	return bless \%h, $pack;
	}

sub F
	{
	my $S0=$_[0]->{"s_boxes"}->[0]->[($_[1]&0xFF000000)>>24];
	my $S1=$_[0]->{"s_boxes"}->[1]->[($_[1]&0x00FF0000)>>16];
	my $S2=$_[0]->{"s_boxes"}->[2]->[($_[1]&0x0000FF00)>>8];
	my $S3=$_[0]->{"s_boxes"}->[3]->[($_[1]&0x000000FF)];
	# this is horrid, but otherwise Perl overflows. :(
	if($S0>$S1)
		{
		$S0=$S0-4294967296 if($S0>2147483647);
		}
	else
		{
		$S1=$S1-4294967296 if($S1>2147483647);
		}
	my $F=($S0+$S1);
	$F+=4294967296 if($F<0);
	$F^=$S2;
	if($F>$S3)
		{
		$F=$F-4294967296 if($F>2147483647);
		}
	else
		{
		$S3=$S3-4294967296 if($S3>2147483647);
		}
	$F+=$S3;
	$F&=0xFFFFFFFF;
	return $F;
	}

sub ROUND
	{
	return($_[1],($_[2]^($_[0]->{"p_boxes"}->[$_[3]]))^F($_[0],$_[1]));
	}

sub crypt_block
	{
	my $self=shift;
	my $l=shift;
	my $r=shift;
	my $d=shift;
	if(!$d)
		{
		$l^=$self->{"p_boxes"}->[0];
		my $i;
		for $i (1..16)
			{
			($r,$l)=ROUND($self,$l,$r,$i);
			}
		$r^=$self->{"p_boxes"}->[17];
		}
	else
		{
		$l^=$self->{"p_boxes"}->[17];
		my $i;
		for $i (1..16)
			{
			($r,$l)=ROUND($self,$l,$r,17-$i);
			}
		$r^=$self->{"p_boxes"}->[0];
		}
	return($r,$l);
	}

=head2 B<encrypt>(I<block>)

The B<encrypt>() method uses the initialised blowfish object to encrypt 8 bytes
of data of the string passed to it. It returns the encrypted block.

=cut

sub encrypt
	{
	my($self)=shift;
	my($block)=shift;
	my(@block)=split//,$block;
	map{$_=unpack("C",$_)}@block;
	# I'm not sure what endianness these are.... so hey.
	my($l)=$block[3]|($block[2]<<8)|($block[1]<<16)|($block[0]<<24);
	my($r)=$block[7]|($block[6]<<8)|($block[5]<<16)|($block[4]<<24);
	
	($l,$r)=crypt_block($self,$l,$r,0);

	@block=(
		$l>>24,($l>>16)&0xFF,($l>>8)&0xFF,$l&0xFF,
		$r>>24,($r>>16)&0xFF,($r>>8)&0xFF,$r&0xFF
		);
	map{$_=pack("C",$_)}@block;
	return join"",@block;
	}

=head2 B<decrypt>(I<block>)

The B<decrypt>() method uses the initialised blowfish object to decrypt 8 bytes
of data of the string passed to it. It returns the decrypted block.

=cut

sub decrypt
	{
	my($self)=shift;
	my($block)=shift;
	my(@block)=split//,$block;
	map{$_=unpack("C",$_)}@block;
	my($l)=$block[3]|($block[2]<<8)|($block[1]<<16)|($block[0]<<24);
	my($r)=$block[7]|($block[6]<<8)|($block[5]<<16)|($block[4]<<24);
	
	($l,$r)=crypt_block($self,$l,$r,1);

	@block=(
		$l>>24,($l>>16)&0xFF,($l>>8)&0xFF,$l&0xFF,
		$r>>24,($r>>16)&0xFF,($r>>8)&0xFF,$r&0xFF
		);
	map{$_=pack("C",$_)}@block;
	return join"",@block;
	}

sub blocksize
	{
	return 8;
	}

sub keysize
	{
	return 56;
	}

=head1 COMMENTS

This is probably crap software, but hey, its for general use. I'm happy to patch
it with other people's code... :)

If you want speed, then see the Crypt::Blowfish module.

=head1 AUTHOR

Matthew Byng-Maddick <C<mbm@colondot.net>>

=head1 SEE ALSO

http://www.counterpane.com/,L<Crypt::CBC>

=cut

1;
