1#!/usr/local/bin/perl
2# des.pl - eric young 22/11/1991 eay@mincom.oz.au or eay@psych.psy.uq.oz.au
3#
4# Copyright (C) 1993 Eric Young
5#
6# 11 April 1996 - patched to circumvent Perl 5 (through 5.002) problem
7#                 with sign-extension on right shift operations.
8#                 Ed Kubaitis - ejk@uiuc.edu
9#
10# eay - 92/08/31 - I think I have fixed all problems for 64bit
11# versions of perl but I could be wrong since I have not tested it yet :-).
12#
13# This is an implementation of DES in perl.
14# The two routines (des_set_key and des_ecb_encrypt)
15# take 8 byte objects as arguments.
16#
17# des_set_key takes an 8 byte string as a key and returns a key schedule
18# for use in calls to des_ecb_encrypt.
19# des_ecb_encrypt takes three arguments, the first is a key schedule
20# (make sure to pass it by reference with the *), the second is 1
21# to encrypt, 0 to decrypt.  The third argument is an 8 byte object
22# to encrypt.  The function returns an 8 byte object that has been
23# DES encrypted.
24#
25# example:
26# require 'des.pl'
27#
28# $key =pack("C8",0x12,0x23,0x45,0x67,0x89,0xab,0xcd,0xef);
29# @ks=  &des_set_key($key);
30#
31# $outbytes= &des_ecb_encrypt(*ks,1,$data);
32# @enc =unpack("C8",$outbytes);
33#
34
35package des;
36
37eval("usr integer;") if (int($]) > 4);
38
39# The following 8 arrays are used in des_set_key
40@skb0=(
41# for C bits (numbered as per FIPS 46) 1 2 3 4 5 6
420x00000000,0x00000010,0x20000000,0x20000010,
430x00010000,0x00010010,0x20010000,0x20010010,
440x00000800,0x00000810,0x20000800,0x20000810,
450x00010800,0x00010810,0x20010800,0x20010810,
460x00000020,0x00000030,0x20000020,0x20000030,
470x00010020,0x00010030,0x20010020,0x20010030,
480x00000820,0x00000830,0x20000820,0x20000830,
490x00010820,0x00010830,0x20010820,0x20010830,
500x00080000,0x00080010,0x20080000,0x20080010,
510x00090000,0x00090010,0x20090000,0x20090010,
520x00080800,0x00080810,0x20080800,0x20080810,
530x00090800,0x00090810,0x20090800,0x20090810,
540x00080020,0x00080030,0x20080020,0x20080030,
550x00090020,0x00090030,0x20090020,0x20090030,
560x00080820,0x00080830,0x20080820,0x20080830,
570x00090820,0x00090830,0x20090820,0x20090830,
58);
59@skb1=(
60# for C bits (numbered as per FIPS 46) 7 8 10 11 12 13
610x00000000,0x02000000,0x00002000,0x02002000,
620x00200000,0x02200000,0x00202000,0x02202000,
630x00000004,0x02000004,0x00002004,0x02002004,
640x00200004,0x02200004,0x00202004,0x02202004,
650x00000400,0x02000400,0x00002400,0x02002400,
660x00200400,0x02200400,0x00202400,0x02202400,
670x00000404,0x02000404,0x00002404,0x02002404,
680x00200404,0x02200404,0x00202404,0x02202404,
690x10000000,0x12000000,0x10002000,0x12002000,
700x10200000,0x12200000,0x10202000,0x12202000,
710x10000004,0x12000004,0x10002004,0x12002004,
720x10200004,0x12200004,0x10202004,0x12202004,
730x10000400,0x12000400,0x10002400,0x12002400,
740x10200400,0x12200400,0x10202400,0x12202400,
750x10000404,0x12000404,0x10002404,0x12002404,
760x10200404,0x12200404,0x10202404,0x12202404,
77);
78@skb2=(
79# for C bits (numbered as per FIPS 46) 14 15 16 17 19 20
800x00000000,0x00000001,0x00040000,0x00040001,
810x01000000,0x01000001,0x01040000,0x01040001,
820x00000002,0x00000003,0x00040002,0x00040003,
830x01000002,0x01000003,0x01040002,0x01040003,
840x00000200,0x00000201,0x00040200,0x00040201,
850x01000200,0x01000201,0x01040200,0x01040201,
860x00000202,0x00000203,0x00040202,0x00040203,
870x01000202,0x01000203,0x01040202,0x01040203,
880x08000000,0x08000001,0x08040000,0x08040001,
890x09000000,0x09000001,0x09040000,0x09040001,
900x08000002,0x08000003,0x08040002,0x08040003,
910x09000002,0x09000003,0x09040002,0x09040003,
920x08000200,0x08000201,0x08040200,0x08040201,
930x09000200,0x09000201,0x09040200,0x09040201,
940x08000202,0x08000203,0x08040202,0x08040203,
950x09000202,0x09000203,0x09040202,0x09040203,
96);
97@skb3=(
98# for C bits (numbered as per FIPS 46) 21 23 24 26 27 28
990x00000000,0x00100000,0x00000100,0x00100100,
1000x00000008,0x00100008,0x00000108,0x00100108,
1010x00001000,0x00101000,0x00001100,0x00101100,
1020x00001008,0x00101008,0x00001108,0x00101108,
1030x04000000,0x04100000,0x04000100,0x04100100,
1040x04000008,0x04100008,0x04000108,0x04100108,
1050x04001000,0x04101000,0x04001100,0x04101100,
1060x04001008,0x04101008,0x04001108,0x04101108,
1070x00020000,0x00120000,0x00020100,0x00120100,
1080x00020008,0x00120008,0x00020108,0x00120108,
1090x00021000,0x00121000,0x00021100,0x00121100,
1100x00021008,0x00121008,0x00021108,0x00121108,
1110x04020000,0x04120000,0x04020100,0x04120100,
1120x04020008,0x04120008,0x04020108,0x04120108,
1130x04021000,0x04121000,0x04021100,0x04121100,
1140x04021008,0x04121008,0x04021108,0x04121108,
115);
116@skb4=(
117# for D bits (numbered as per FIPS 46) 1 2 3 4 5 6
1180x00000000,0x10000000,0x00010000,0x10010000,
1190x00000004,0x10000004,0x00010004,0x10010004,
1200x20000000,0x30000000,0x20010000,0x30010000,
1210x20000004,0x30000004,0x20010004,0x30010004,
1220x00100000,0x10100000,0x00110000,0x10110000,
1230x00100004,0x10100004,0x00110004,0x10110004,
1240x20100000,0x30100000,0x20110000,0x30110000,
1250x20100004,0x30100004,0x20110004,0x30110004,
1260x00001000,0x10001000,0x00011000,0x10011000,
1270x00001004,0x10001004,0x00011004,0x10011004,
1280x20001000,0x30001000,0x20011000,0x30011000,
1290x20001004,0x30001004,0x20011004,0x30011004,
1300x00101000,0x10101000,0x00111000,0x10111000,
1310x00101004,0x10101004,0x00111004,0x10111004,
1320x20101000,0x30101000,0x20111000,0x30111000,
1330x20101004,0x30101004,0x20111004,0x30111004,
134);
135@skb5=(
136# for D bits (numbered as per FIPS 46) 8 9 11 12 13 14
1370x00000000,0x08000000,0x00000008,0x08000008,
1380x00000400,0x08000400,0x00000408,0x08000408,
1390x00020000,0x08020000,0x00020008,0x08020008,
1400x00020400,0x08020400,0x00020408,0x08020408,
1410x00000001,0x08000001,0x00000009,0x08000009,
1420x00000401,0x08000401,0x00000409,0x08000409,
1430x00020001,0x08020001,0x00020009,0x08020009,
1440x00020401,0x08020401,0x00020409,0x08020409,
1450x02000000,0x0A000000,0x02000008,0x0A000008,
1460x02000400,0x0A000400,0x02000408,0x0A000408,
1470x02020000,0x0A020000,0x02020008,0x0A020008,
1480x02020400,0x0A020400,0x02020408,0x0A020408,
1490x02000001,0x0A000001,0x02000009,0x0A000009,
1500x02000401,0x0A000401,0x02000409,0x0A000409,
1510x02020001,0x0A020001,0x02020009,0x0A020009,
1520x02020401,0x0A020401,0x02020409,0x0A020409,
153);
154@skb6=(
155# for D bits (numbered as per FIPS 46) 16 17 18 19 20 21
1560x00000000,0x00000100,0x00080000,0x00080100,
1570x01000000,0x01000100,0x01080000,0x01080100,
1580x00000010,0x00000110,0x00080010,0x00080110,
1590x01000010,0x01000110,0x01080010,0x01080110,
1600x00200000,0x00200100,0x00280000,0x00280100,
1610x01200000,0x01200100,0x01280000,0x01280100,
1620x00200010,0x00200110,0x00280010,0x00280110,
1630x01200010,0x01200110,0x01280010,0x01280110,
1640x00000200,0x00000300,0x00080200,0x00080300,
1650x01000200,0x01000300,0x01080200,0x01080300,
1660x00000210,0x00000310,0x00080210,0x00080310,
1670x01000210,0x01000310,0x01080210,0x01080310,
1680x00200200,0x00200300,0x00280200,0x00280300,
1690x01200200,0x01200300,0x01280200,0x01280300,
1700x00200210,0x00200310,0x00280210,0x00280310,
1710x01200210,0x01200310,0x01280210,0x01280310,
172);
173@skb7=(
174# for D bits (numbered as per FIPS 46) 22 23 24 25 27 28
1750x00000000,0x04000000,0x00040000,0x04040000,
1760x00000002,0x04000002,0x00040002,0x04040002,
1770x00002000,0x04002000,0x00042000,0x04042000,
1780x00002002,0x04002002,0x00042002,0x04042002,
1790x00000020,0x04000020,0x00040020,0x04040020,
1800x00000022,0x04000022,0x00040022,0x04040022,
1810x00002020,0x04002020,0x00042020,0x04042020,
1820x00002022,0x04002022,0x00042022,0x04042022,
1830x00000800,0x04000800,0x00040800,0x04040800,
1840x00000802,0x04000802,0x00040802,0x04040802,
1850x00002800,0x04002800,0x00042800,0x04042800,
1860x00002802,0x04002802,0x00042802,0x04042802,
1870x00000820,0x04000820,0x00040820,0x04040820,
1880x00000822,0x04000822,0x00040822,0x04040822,
1890x00002820,0x04002820,0x00042820,0x04042820,
1900x00002822,0x04002822,0x00042822,0x04042822,
191);
192
193@shifts2=(0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0);
194
195# used in ecb_encrypt
196@SP0=(
1970x00410100, 0x00010000, 0x40400000, 0x40410100,
1980x00400000, 0x40010100, 0x40010000, 0x40400000,
1990x40010100, 0x00410100, 0x00410000, 0x40000100,
2000x40400100, 0x00400000, 0x00000000, 0x40010000,
2010x00010000, 0x40000000, 0x00400100, 0x00010100,
2020x40410100, 0x00410000, 0x40000100, 0x00400100,
2030x40000000, 0x00000100, 0x00010100, 0x40410000,
2040x00000100, 0x40400100, 0x40410000, 0x00000000,
2050x00000000, 0x40410100, 0x00400100, 0x40010000,
2060x00410100, 0x00010000, 0x40000100, 0x00400100,
2070x40410000, 0x00000100, 0x00010100, 0x40400000,
2080x40010100, 0x40000000, 0x40400000, 0x00410000,
2090x40410100, 0x00010100, 0x00410000, 0x40400100,
2100x00400000, 0x40000100, 0x40010000, 0x00000000,
2110x00010000, 0x00400000, 0x40400100, 0x00410100,
2120x40000000, 0x40410000, 0x00000100, 0x40010100,
213);
214@SP1=(
2150x08021002, 0x00000000, 0x00021000, 0x08020000,
2160x08000002, 0x00001002, 0x08001000, 0x00021000,
2170x00001000, 0x08020002, 0x00000002, 0x08001000,
2180x00020002, 0x08021000, 0x08020000, 0x00000002,
2190x00020000, 0x08001002, 0x08020002, 0x00001000,
2200x00021002, 0x08000000, 0x00000000, 0x00020002,
2210x08001002, 0x00021002, 0x08021000, 0x08000002,
2220x08000000, 0x00020000, 0x00001002, 0x08021002,
2230x00020002, 0x08021000, 0x08001000, 0x00021002,
2240x08021002, 0x00020002, 0x08000002, 0x00000000,
2250x08000000, 0x00001002, 0x00020000, 0x08020002,
2260x00001000, 0x08000000, 0x00021002, 0x08001002,
2270x08021000, 0x00001000, 0x00000000, 0x08000002,
2280x00000002, 0x08021002, 0x00021000, 0x08020000,
2290x08020002, 0x00020000, 0x00001002, 0x08001000,
2300x08001002, 0x00000002, 0x08020000, 0x00021000,
231);
232@SP2=(
2330x20800000, 0x00808020, 0x00000020, 0x20800020,
2340x20008000, 0x00800000, 0x20800020, 0x00008020,
2350x00800020, 0x00008000, 0x00808000, 0x20000000,
2360x20808020, 0x20000020, 0x20000000, 0x20808000,
2370x00000000, 0x20008000, 0x00808020, 0x00000020,
2380x20000020, 0x20808020, 0x00008000, 0x20800000,
2390x20808000, 0x00800020, 0x20008020, 0x00808000,
2400x00008020, 0x00000000, 0x00800000, 0x20008020,
2410x00808020, 0x00000020, 0x20000000, 0x00008000,
2420x20000020, 0x20008000, 0x00808000, 0x20800020,
2430x00000000, 0x00808020, 0x00008020, 0x20808000,
2440x20008000, 0x00800000, 0x20808020, 0x20000000,
2450x20008020, 0x20800000, 0x00800000, 0x20808020,
2460x00008000, 0x00800020, 0x20800020, 0x00008020,
2470x00800020, 0x00000000, 0x20808000, 0x20000020,
2480x20800000, 0x20008020, 0x00000020, 0x00808000,
249);
250@SP3=(
2510x00080201, 0x02000200, 0x00000001, 0x02080201,
2520x00000000, 0x02080000, 0x02000201, 0x00080001,
2530x02080200, 0x02000001, 0x02000000, 0x00000201,
2540x02000001, 0x00080201, 0x00080000, 0x02000000,
2550x02080001, 0x00080200, 0x00000200, 0x00000001,
2560x00080200, 0x02000201, 0x02080000, 0x00000200,
2570x00000201, 0x00000000, 0x00080001, 0x02080200,
2580x02000200, 0x02080001, 0x02080201, 0x00080000,
2590x02080001, 0x00000201, 0x00080000, 0x02000001,
2600x00080200, 0x02000200, 0x00000001, 0x02080000,
2610x02000201, 0x00000000, 0x00000200, 0x00080001,
2620x00000000, 0x02080001, 0x02080200, 0x00000200,
2630x02000000, 0x02080201, 0x00080201, 0x00080000,
2640x02080201, 0x00000001, 0x02000200, 0x00080201,
2650x00080001, 0x00080200, 0x02080000, 0x02000201,
2660x00000201, 0x02000000, 0x02000001, 0x02080200,
267);
268@SP4=(
2690x01000000, 0x00002000, 0x00000080, 0x01002084,
2700x01002004, 0x01000080, 0x00002084, 0x01002000,
2710x00002000, 0x00000004, 0x01000004, 0x00002080,
2720x01000084, 0x01002004, 0x01002080, 0x00000000,
2730x00002080, 0x01000000, 0x00002004, 0x00000084,
2740x01000080, 0x00002084, 0x00000000, 0x01000004,
2750x00000004, 0x01000084, 0x01002084, 0x00002004,
2760x01002000, 0x00000080, 0x00000084, 0x01002080,
2770x01002080, 0x01000084, 0x00002004, 0x01002000,
2780x00002000, 0x00000004, 0x01000004, 0x01000080,
2790x01000000, 0x00002080, 0x01002084, 0x00000000,
2800x00002084, 0x01000000, 0x00000080, 0x00002004,
2810x01000084, 0x00000080, 0x00000000, 0x01002084,
2820x01002004, 0x01002080, 0x00000084, 0x00002000,
2830x00002080, 0x01002004, 0x01000080, 0x00000084,
2840x00000004, 0x00002084, 0x01002000, 0x01000004,
285);
286@SP5=(
2870x10000008, 0x00040008, 0x00000000, 0x10040400,
2880x00040008, 0x00000400, 0x10000408, 0x00040000,
2890x00000408, 0x10040408, 0x00040400, 0x10000000,
2900x10000400, 0x10000008, 0x10040000, 0x00040408,
2910x00040000, 0x10000408, 0x10040008, 0x00000000,
2920x00000400, 0x00000008, 0x10040400, 0x10040008,
2930x10040408, 0x10040000, 0x10000000, 0x00000408,
2940x00000008, 0x00040400, 0x00040408, 0x10000400,
2950x00000408, 0x10000000, 0x10000400, 0x00040408,
2960x10040400, 0x00040008, 0x00000000, 0x10000400,
2970x10000000, 0x00000400, 0x10040008, 0x00040000,
2980x00040008, 0x10040408, 0x00040400, 0x00000008,
2990x10040408, 0x00040400, 0x00040000, 0x10000408,
3000x10000008, 0x10040000, 0x00040408, 0x00000000,
3010x00000400, 0x10000008, 0x10000408, 0x10040400,
3020x10040000, 0x00000408, 0x00000008, 0x10040008,
303);
304@SP6=(
3050x00000800, 0x00000040, 0x00200040, 0x80200000,
3060x80200840, 0x80000800, 0x00000840, 0x00000000,
3070x00200000, 0x80200040, 0x80000040, 0x00200800,
3080x80000000, 0x00200840, 0x00200800, 0x80000040,
3090x80200040, 0x00000800, 0x80000800, 0x80200840,
3100x00000000, 0x00200040, 0x80200000, 0x00000840,
3110x80200800, 0x80000840, 0x00200840, 0x80000000,
3120x80000840, 0x80200800, 0x00000040, 0x00200000,
3130x80000840, 0x00200800, 0x80200800, 0x80000040,
3140x00000800, 0x00000040, 0x00200000, 0x80200800,
3150x80200040, 0x80000840, 0x00000840, 0x00000000,
3160x00000040, 0x80200000, 0x80000000, 0x00200040,
3170x00000000, 0x80200040, 0x00200040, 0x00000840,
3180x80000040, 0x00000800, 0x80200840, 0x00200000,
3190x00200840, 0x80000000, 0x80000800, 0x80200840,
3200x80200000, 0x00200840, 0x00200800, 0x80000800,
321);
322@SP7=(
3230x04100010, 0x04104000, 0x00004010, 0x00000000,
3240x04004000, 0x00100010, 0x04100000, 0x04104010,
3250x00000010, 0x04000000, 0x00104000, 0x00004010,
3260x00104010, 0x04004010, 0x04000010, 0x04100000,
3270x00004000, 0x00104010, 0x00100010, 0x04004000,
3280x04104010, 0x04000010, 0x00000000, 0x00104000,
3290x04000000, 0x00100000, 0x04004010, 0x04100010,
3300x00100000, 0x00004000, 0x04104000, 0x00000010,
3310x00100000, 0x00004000, 0x04000010, 0x04104010,
3320x00004010, 0x04000000, 0x00000000, 0x00104000,
3330x04100010, 0x04004010, 0x04004000, 0x00100010,
3340x04104000, 0x00000010, 0x00100010, 0x04004000,
3350x04104010, 0x00100000, 0x04100000, 0x04000010,
3360x00104000, 0x00004010, 0x04004010, 0x04100000,
3370x00000010, 0x04104000, 0x00104010, 0x00000000,
3380x04000000, 0x04100010, 0x00004000, 0x00104010,
339);
340
341sub main'des_set_key
342	{
343	local($param)=@_;
344	local(@key);
345	local($c,$d,$i,$s,$t);
346	local(@ks)=();
347
348	# Get the bytes in the order we want.
349	@key=unpack("C8",$param);
350
351	$c=	($key[0]    )|
352		($key[1]<< 8)|
353		($key[2]<<16)|
354		($key[3]<<24);
355	$d=	($key[4]    )|
356		($key[5]<< 8)|
357		($key[6]<<16)|
358		($key[7]<<24);
359
360	&doPC1(*c,*d);
361
362	for $i (@shifts2)
363		{
364		if ($i)
365			{
366			$c=($c>>2)|($c<<26);
367			$d=($d>>2)|($d<<26);
368			}
369		else
370			{
371			$c=($c>>1)|($c<<27);
372			$d=($d>>1)|($d<<27);
373			}
374		$c&=0x0fffffff;
375		$d&=0x0fffffff;
376		$s=	$skb0[ ($c    )&0x3f                 ]|
377			$skb1[(($c>> 6)&0x03)|(($c>> 7)&0x3c)]|
378			$skb2[(($c>>13)&0x0f)|(($c>>14)&0x30)]|
379			$skb3[(($c>>20)&0x01)|(($c>>21)&0x06) |
380					     (($c>>22)&0x38)];
381		$t=     $skb4[ ($d    )&0x3f                ]|
382			$skb5[(($d>> 7)&0x03)|(($d>> 8)&0x3c)]|
383			$skb6[ ($d>>15)&0x3f                 ]|
384			$skb7[(($d>>21)&0x0f)|(($d>>22)&0x30)];
385		push(@ks,(($t<<16)|($s&0x0000ffff))&0xffffffff);
386		$s=      (($s>>16)&0x0000ffff)|($t&0xffff0000) ;
387		push(@ks,(($s<<4)|(($s>>28)&0xf))&0xffffffff);
388		}
389	@ks;
390	}
391
392sub doPC1
393	{
394	local(*a,*b)=@_;
395	local($t);
396
397	$t=(($b>>4)^$a)&0x0f0f0f0f;
398	$b^=($t<<4); $a^=$t;
399	# do $a first
400	$t=(($a<<18)^$a)&0xcccc0000;
401	$a=$a^$t^(($t>>18)&0x00003fff);
402	$t=(($a<<17)^$a)&0xaaaa0000;
403	$a=$a^$t^(($t>>17)&0x00007fff);
404	$t=(($a<< 8)^$a)&0x00ff0000;
405	$a=$a^$t^(($t>> 8)&0x00ffffff);
406	$t=(($a<<17)^$a)&0xaaaa0000;
407	$a=$a^$t^(($t>>17)&0x00007fff);
408
409	# now do $b
410	$t=(($b<<24)^$b)&0xff000000;
411	$b=$b^$t^(($t>>24)&0x000000ff);
412	$t=(($b<< 8)^$b)&0x00ff0000;
413	$b=$b^$t^(($t>> 8)&0x00ffffff);
414	$t=(($b<<14)^$b)&0x33330000;
415	$b=$b^$t^(($t>>14)&0x0003ffff);
416	$b=(($b&0x00aa00aa)<<7)|(($b&0x55005500)>>7)|($b&0xaa55aa55);
417	$b=(($b>>8)&0x00ffffff)|((($a&0xf0000000)>>4)&0x0fffffff);
418	$a&=0x0fffffff;
419	}
420
421sub doIP
422	{
423	local(*a,*b)=@_;
424	local($t);
425
426	$t=(($b>> 4)^$a)&0x0f0f0f0f;
427	$b^=($t<< 4); $a^=$t;
428	$t=(($a>>16)^$b)&0x0000ffff;
429	$a^=($t<<16); $b^=$t;
430	$t=(($b>> 2)^$a)&0x33333333;
431	$b^=($t<< 2); $a^=$t;
432	$t=(($a>> 8)^$b)&0x00ff00ff;
433	$a^=($t<< 8); $b^=$t;
434	$t=(($b>> 1)^$a)&0x55555555;
435	$b^=($t<< 1); $a^=$t;
436	$t=$a;
437	$a=$b&0xffffffff;
438	$b=$t&0xffffffff;
439	}
440
441sub doFP
442	{
443	local(*a,*b)=@_;
444	local($t);
445
446	$t=(($b>> 1)^$a)&0x55555555;
447	$b^=($t<< 1); $a^=$t;
448	$t=(($a>> 8)^$b)&0x00ff00ff;
449	$a^=($t<< 8); $b^=$t;
450	$t=(($b>> 2)^$a)&0x33333333;
451	$b^=($t<< 2); $a^=$t;
452	$t=(($a>>16)^$b)&0x0000ffff;
453	$a^=($t<<16); $b^=$t;
454	$t=(($b>> 4)^$a)&0x0f0f0f0f;
455	$b^=($t<< 4); $a^=$t;
456	$a&=0xffffffff;
457	$b&=0xffffffff;
458	}
459
460sub main'des_ecb_encrypt
461	{
462	local(*ks,$encrypt,$in)=@_;
463	local($l,$r,$i,$t,$u,@input);
464
465	@input=unpack("C8",$in);
466	# Get the bytes in the order we want.
467	$l=	($input[0]    )|
468		($input[1]<< 8)|
469		($input[2]<<16)|
470		($input[3]<<24);
471	$r=	($input[4]    )|
472		($input[5]<< 8)|
473		($input[6]<<16)|
474		($input[7]<<24);
475
476	$l&=0xffffffff;
477	$r&=0xffffffff;
478	&doIP(*l,*r);
479	if ($encrypt)
480		{
481		for ($i=0; $i<32; $i+=4)
482			{
483			$t=((($r&0x7fffffff)<<1)|(($r>>31)&0x00000001));
484			$u=$t^$ks[$i  ];
485			$t=$t^$ks[$i+1];
486			$t2=(($t&0x0000000f)<<28);
487
488			$t=((($t>>4)&0x0fffffff)|(($t&0x0000000f)<<28));
489			$l^=	$SP1[ $t     &0x3f]|
490				$SP3[($t>> 8)&0x3f]|
491				$SP5[($t>>16)&0x3f]|
492				$SP7[($t>>24)&0x3f]|
493				$SP0[ $u     &0x3f]|
494				$SP2[($u>> 8)&0x3f]|
495				$SP4[($u>>16)&0x3f]|
496				$SP6[($u>>24)&0x3f];
497
498			$t=(($l<<1)|(($l>>31)&0x1))&0xffffffff;
499			$u=$t^$ks[$i+2];
500			$t=$t^$ks[$i+3];
501			$t=((($t>>4)&0x0fffffff)|($t<<28))&0xffffffff;
502			$r^=	$SP1[ $t     &0x3f]|
503				$SP3[($t>> 8)&0x3f]|
504				$SP5[($t>>16)&0x3f]|
505				$SP7[($t>>24)&0x3f]|
506				$SP0[ $u     &0x3f]|
507				$SP2[($u>> 8)&0x3f]|
508				$SP4[($u>>16)&0x3f]|
509				$SP6[($u>>24)&0x3f];
510			}
511		}
512	else
513		{
514		for ($i=30; $i>0; $i-=4)
515			{
516			$t=(($r<<1)|(($r>>31)&0x1))&0xffffffff;
517			$u=$t^$ks[$i  ];
518			$t=$t^$ks[$i+1];
519			$t=((($t>>4)&0x0fffffff)|($t<<28))&0xffffffff;
520			$l^=	$SP1[ $t     &0x3f]|
521				$SP3[($t>> 8)&0x3f]|
522				$SP5[($t>>16)&0x3f]|
523				$SP7[($t>>24)&0x3f]|
524				$SP0[ $u     &0x3f]|
525				$SP2[($u>> 8)&0x3f]|
526				$SP4[($u>>16)&0x3f]|
527				$SP6[($u>>24)&0x3f];
528
529			$t=(($l<<1)|(($l>>31)&0x1))&0xffffffff;
530			$u=$t^$ks[$i-2];
531			$t=$t^$ks[$i-1];
532			$t=((($t>>4)&0x0fffffff)|($t<<28))&0xffffffff;
533			$r^=	$SP1[ $t     &0x3f]|
534				$SP3[($t>> 8)&0x3f]|
535				$SP5[($t>>16)&0x3f]|
536				$SP7[($t>>24)&0x3f]|
537				$SP0[ $u     &0x3f]|
538				$SP2[($u>> 8)&0x3f]|
539				$SP4[($u>>16)&0x3f]|
540				$SP6[($u>>24)&0x3f];
541			}
542		}
543	&doFP(*l,*r);
544	pack("C8",$l&0xff,
545	          ($l>> 8)&0x00ffffff,
546	          ($l>>16)&0x0000ffff,
547		  ($l>>24)&0x000000ff,
548		  $r&0xff,
549	          ($r>> 8)&0x00ffffff,
550	          ($r>>16)&0x0000ffff,
551		  ($r>>24)&0x000000ff);
552	}
553