#!/usr/bin/env python # des.py - Python port of des.pl # Copyright (C) 2007 by Yusuke Shinyama (yusuke at cs . nyu . edu) ## Copyright (c) 1995-1998 Eric Young (eay@cryptsoft.com) All rights reserved. ## ## Redistribution and use in source and binary forms, with or without modification, ## are permitted provided that the following conditions are met: ## ## This library is free for commercial and non-commercial use as long as ## the following conditions are aheared to. The following conditions ## apply to all code found in this distribution, be it the RC4, RSA, ## lhash, DES, etc., code; not just the SSL code. The SSL documentation ## included with this distribution is covered by the same copyright terms ## except that the holder is Tim Hudson (tjh@cryptsoft.com). ## ## Copyright remains Eric Young¡Çs, and as such any Copyright notices in ## the code are not to be removed. If this package is used in a product, ## Eric Young should be given attribution as the author of the parts of the library used. ## This can be in the form of a textual message at program startup or ## in documentation (online or textual) provided with the package. ## ## Redistribution and use in source and binary forms, with or without modification, ## are permitted provided that the following conditions are met: ## ## 1. Redistributions of source code must retain the copyright ## notice, this list of conditions and the following disclaimer. ## 2. Redistributions in binary form must reproduce the above copyright ## notice, this list of conditions and the following disclaimer in the ## documentation and/or other materials provided with the distribution. ## 3. All advertising materials mentioning features or use of this software ## must display the following acknowledgement: ## ¡ÈThis product includes cryptographic software written by ## Eric Young (eay@cryptsoft.com)¡É ## The word ¡Æcryptographic¡Ç can be left out if the rouines from the library ## being used are not cryptographic related :-). ## 4. If you include any Windows specific code (or a derivative thereof) from ## the apps directory (application code) you must include an acknowledgement: ## ¡ÈThis product includes software written by Tim Hudson (tjh@cryptsoft.com)¡É ## ## THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ¡Æ¡ÆAS IS¡Ç¡Ç AND ## ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE ## IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ## ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE ## FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL ## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS ## OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ## HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT ## LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY ## OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF ## SUCH DAMAGE. ## ## The licence and distribution terms for any publically available version or ## derivative of this code cannot be changed. i.e. this code cannot simply be ## copied and put under another distribution licence ## [including the GNU Public Licence.] from struct import pack, unpack # des.pl - eric young 22/11/1991 eay@cryptsoft.com # # Copyright (C) 1993 Eric Young # # 11 April 1996 - patched to circumvent Perl 5 (through 5.002) problem # with sign-extension on right shift operations. # Ed Kubaitis - ejk@uiuc.edu # # The following 8 arrays are used in des_set_key skb0 = [ # 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, ] skb1 = [ # 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, ] skb2 = [ # 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, ] skb3 = [ # 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, ] skb4 = [ # 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, ] skb5 = [ # 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, ] skb6 = [ # 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, ] skb7 = [ # 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, ] shifts2 = [0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0] # used in ecb_encrypt SP0 = [ 0x00410100, 0x00010000, 0x40400000, 0x40410100, 0x00400000, 0x40010100, 0x40010000, 0x40400000, 0x40010100, 0x00410100, 0x00410000, 0x40000100, 0x40400100, 0x00400000, 0x00000000, 0x40010000, 0x00010000, 0x40000000, 0x00400100, 0x00010100, 0x40410100, 0x00410000, 0x40000100, 0x00400100, 0x40000000, 0x00000100, 0x00010100, 0x40410000, 0x00000100, 0x40400100, 0x40410000, 0x00000000, 0x00000000, 0x40410100, 0x00400100, 0x40010000, 0x00410100, 0x00010000, 0x40000100, 0x00400100, 0x40410000, 0x00000100, 0x00010100, 0x40400000, 0x40010100, 0x40000000, 0x40400000, 0x00410000, 0x40410100, 0x00010100, 0x00410000, 0x40400100, 0x00400000, 0x40000100, 0x40010000, 0x00000000, 0x00010000, 0x00400000, 0x40400100, 0x00410100, 0x40000000, 0x40410000, 0x00000100, 0x40010100, ] SP1 = [ 0x08021002, 0x00000000, 0x00021000, 0x08020000, 0x08000002, 0x00001002, 0x08001000, 0x00021000, 0x00001000, 0x08020002, 0x00000002, 0x08001000, 0x00020002, 0x08021000, 0x08020000, 0x00000002, 0x00020000, 0x08001002, 0x08020002, 0x00001000, 0x00021002, 0x08000000, 0x00000000, 0x00020002, 0x08001002, 0x00021002, 0x08021000, 0x08000002, 0x08000000, 0x00020000, 0x00001002, 0x08021002, 0x00020002, 0x08021000, 0x08001000, 0x00021002, 0x08021002, 0x00020002, 0x08000002, 0x00000000, 0x08000000, 0x00001002, 0x00020000, 0x08020002, 0x00001000, 0x08000000, 0x00021002, 0x08001002, 0x08021000, 0x00001000, 0x00000000, 0x08000002, 0x00000002, 0x08021002, 0x00021000, 0x08020000, 0x08020002, 0x00020000, 0x00001002, 0x08001000, 0x08001002, 0x00000002, 0x08020000, 0x00021000, ] SP2 = [ 0x20800000, 0x00808020, 0x00000020, 0x20800020, 0x20008000, 0x00800000, 0x20800020, 0x00008020, 0x00800020, 0x00008000, 0x00808000, 0x20000000, 0x20808020, 0x20000020, 0x20000000, 0x20808000, 0x00000000, 0x20008000, 0x00808020, 0x00000020, 0x20000020, 0x20808020, 0x00008000, 0x20800000, 0x20808000, 0x00800020, 0x20008020, 0x00808000, 0x00008020, 0x00000000, 0x00800000, 0x20008020, 0x00808020, 0x00000020, 0x20000000, 0x00008000, 0x20000020, 0x20008000, 0x00808000, 0x20800020, 0x00000000, 0x00808020, 0x00008020, 0x20808000, 0x20008000, 0x00800000, 0x20808020, 0x20000000, 0x20008020, 0x20800000, 0x00800000, 0x20808020, 0x00008000, 0x00800020, 0x20800020, 0x00008020, 0x00800020, 0x00000000, 0x20808000, 0x20000020, 0x20800000, 0x20008020, 0x00000020, 0x00808000, ] SP3 = [ 0x00080201, 0x02000200, 0x00000001, 0x02080201, 0x00000000, 0x02080000, 0x02000201, 0x00080001, 0x02080200, 0x02000001, 0x02000000, 0x00000201, 0x02000001, 0x00080201, 0x00080000, 0x02000000, 0x02080001, 0x00080200, 0x00000200, 0x00000001, 0x00080200, 0x02000201, 0x02080000, 0x00000200, 0x00000201, 0x00000000, 0x00080001, 0x02080200, 0x02000200, 0x02080001, 0x02080201, 0x00080000, 0x02080001, 0x00000201, 0x00080000, 0x02000001, 0x00080200, 0x02000200, 0x00000001, 0x02080000, 0x02000201, 0x00000000, 0x00000200, 0x00080001, 0x00000000, 0x02080001, 0x02080200, 0x00000200, 0x02000000, 0x02080201, 0x00080201, 0x00080000, 0x02080201, 0x00000001, 0x02000200, 0x00080201, 0x00080001, 0x00080200, 0x02080000, 0x02000201, 0x00000201, 0x02000000, 0x02000001, 0x02080200, ] SP4 = [ 0x01000000, 0x00002000, 0x00000080, 0x01002084, 0x01002004, 0x01000080, 0x00002084, 0x01002000, 0x00002000, 0x00000004, 0x01000004, 0x00002080, 0x01000084, 0x01002004, 0x01002080, 0x00000000, 0x00002080, 0x01000000, 0x00002004, 0x00000084, 0x01000080, 0x00002084, 0x00000000, 0x01000004, 0x00000004, 0x01000084, 0x01002084, 0x00002004, 0x01002000, 0x00000080, 0x00000084, 0x01002080, 0x01002080, 0x01000084, 0x00002004, 0x01002000, 0x00002000, 0x00000004, 0x01000004, 0x01000080, 0x01000000, 0x00002080, 0x01002084, 0x00000000, 0x00002084, 0x01000000, 0x00000080, 0x00002004, 0x01000084, 0x00000080, 0x00000000, 0x01002084, 0x01002004, 0x01002080, 0x00000084, 0x00002000, 0x00002080, 0x01002004, 0x01000080, 0x00000084, 0x00000004, 0x00002084, 0x01002000, 0x01000004, ] SP5 = [ 0x10000008, 0x00040008, 0x00000000, 0x10040400, 0x00040008, 0x00000400, 0x10000408, 0x00040000, 0x00000408, 0x10040408, 0x00040400, 0x10000000, 0x10000400, 0x10000008, 0x10040000, 0x00040408, 0x00040000, 0x10000408, 0x10040008, 0x00000000, 0x00000400, 0x00000008, 0x10040400, 0x10040008, 0x10040408, 0x10040000, 0x10000000, 0x00000408, 0x00000008, 0x00040400, 0x00040408, 0x10000400, 0x00000408, 0x10000000, 0x10000400, 0x00040408, 0x10040400, 0x00040008, 0x00000000, 0x10000400, 0x10000000, 0x00000400, 0x10040008, 0x00040000, 0x00040008, 0x10040408, 0x00040400, 0x00000008, 0x10040408, 0x00040400, 0x00040000, 0x10000408, 0x10000008, 0x10040000, 0x00040408, 0x00000000, 0x00000400, 0x10000008, 0x10000408, 0x10040400, 0x10040000, 0x00000408, 0x00000008, 0x10040008, ] SP6 = [ 0x00000800, 0x00000040, 0x00200040, 0x80200000, 0x80200840, 0x80000800, 0x00000840, 0x00000000, 0x00200000, 0x80200040, 0x80000040, 0x00200800, 0x80000000, 0x00200840, 0x00200800, 0x80000040, 0x80200040, 0x00000800, 0x80000800, 0x80200840, 0x00000000, 0x00200040, 0x80200000, 0x00000840, 0x80200800, 0x80000840, 0x00200840, 0x80000000, 0x80000840, 0x80200800, 0x00000040, 0x00200000, 0x80000840, 0x00200800, 0x80200800, 0x80000040, 0x00000800, 0x00000040, 0x00200000, 0x80200800, 0x80200040, 0x80000840, 0x00000840, 0x00000000, 0x00000040, 0x80200000, 0x80000000, 0x00200040, 0x00000000, 0x80200040, 0x00200040, 0x00000840, 0x80000040, 0x00000800, 0x80200840, 0x00200000, 0x00200840, 0x80000000, 0x80000800, 0x80200840, 0x80200000, 0x00200840, 0x00200800, 0x80000800, ] SP7 = [ 0x04100010, 0x04104000, 0x00004010, 0x00000000, 0x04004000, 0x00100010, 0x04100000, 0x04104010, 0x00000010, 0x04000000, 0x00104000, 0x00004010, 0x00104010, 0x04004010, 0x04000010, 0x04100000, 0x00004000, 0x00104010, 0x00100010, 0x04004000, 0x04104010, 0x04000010, 0x00000000, 0x00104000, 0x04000000, 0x00100000, 0x04004010, 0x04100010, 0x00100000, 0x00004000, 0x04104000, 0x00000010, 0x00100000, 0x00004000, 0x04000010, 0x04104010, 0x00004010, 0x04000000, 0x00000000, 0x00104000, 0x04100010, 0x04004010, 0x04004000, 0x00100010, 0x04104000, 0x00000010, 0x00100010, 0x04004000, 0x04104010, 0x00100000, 0x04100000, 0x04000010, 0x00104000, 0x00004010, 0x04004010, 0x04100000, 0x00000010, 0x04104000, 0x00104010, 0x00000000, 0x04000000, 0x04100010, 0x00004000, 0x00104010, ] def doPC1(a, b): t = ((b >> 4) ^ a) & 0x0f0f0f0f b ^= (t << 4) a ^= t # do $a first t = ((a << 18) ^ a) & 0xcccc0000 a = a ^ t ^ ((t >> 18) & 0x00003fff) t = ((a << 17) ^ a) & 0xaaaa0000 a = a ^ t ^ ((t >> 17) & 0x00007fff) t = ((a << 8) ^ a) & 0x00ff0000 a = a ^ t ^ ((t >> 8) & 0x00ffffff) t = ((a << 17) ^ a) & 0xaaaa0000 a = a ^ t ^ ((t >> 17) & 0x00007fff) # now do $b t = ((b << 24) ^ b) & 0xff000000 b = b ^ t ^ ((t >> 24) & 0x000000ff) t = ((b << 8) ^ b) & 0x00ff0000 b = b ^ t ^ ((t >> 8) & 0x00ffffff) t = ((b << 14) ^ b) & 0x33330000 b = b ^ t ^ ((t >> 14) & 0x0003ffff) b = ((b & 0x00aa00aa) << 7) | ((b & 0x55005500) >> 7) | (b & 0xaa55aa55) b = ((b >> 8) & 0x00ffffff) | (((a & 0xf0000000) >> 4) & 0x0fffffff) a &= 0x0fffffff return (a, b) def doIP(a, b): t = ((b >> 4) ^ a) & 0x0f0f0f0f b ^= (t << 4) a ^= t t = ((a >> 16) ^ b) & 0x0000ffff a ^= (t << 16) b ^= t t = ((b >> 2) ^ a) & 0x33333333 b ^= (t << 2) a ^= t t = ((a >> 8) ^ b) & 0x00ff00ff a ^= (t << 8) b ^= t t = ((b >> 1) ^ a) & 0x55555555 b ^= (t << 1) a ^= t t = a a = b & 0xffffffff b = t & 0xffffffff return (a, b) def doFP(a, b): t = ((b >> 1) ^ a) & 0x55555555 b ^= (t << 1) a ^= t t = ((a >> 8) ^ b) & 0x00ff00ff a ^= (t << 8) b ^= t t = ((b >> 2) ^ a) & 0x33333333 b ^= (t << 2) a ^= t t = ((a >> 16) ^ b) & 0x0000ffff a ^= (t << 16) b ^= t t = ((b >> 4) ^ a) & 0x0f0f0f0f b ^= (t << 4) a ^= t a &= 0xffffffff b &= 0xffffffff return (a, b) def des_set_key(param): # Get the bytes in the order we want. key = unpack('8B', param) print key c = ((key[0] ) | (key[1] << 8) | (key[2] << 16) | (key[3] << 24)) d = ((key[4] ) | (key[5] << 8) | (key[6] << 16) | (key[7] << 24)) print (c, d) (c, d) = doPC1(c, d) ks = [] for i in shifts2: if 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 = (skb0[(c ) & 0x3f ] | skb1[((c >> 6) & 0x03) | ((c >> 7) & 0x3c)] | skb2[((c >> 13) & 0x0f) | ((c >> 14) & 0x30)] | skb3[((c >> 20) & 0x01) | ((c >> 21) & 0x06) | ((c>>22) & 0x38)]) t = (skb4[(d ) & 0x3f ] | skb5[((d >> 7) & 0x03) | ((d >> 8) & 0x3c)] | skb6[(d >> 15) & 0x3f ] | skb7[((d >> 21) & 0x0f) | ((d >> 22) & 0x30)]) ks.append( ((t << 16) | (s & 0x0000ffff)) & 0xffffffff) s = ((s >> 16) & 0x0000ffff) | (t & 0xffff0000) ks.append( ((s << 4) | ((s >> 28) & 0xf)) & 0xffffffff) return ks def des_ecb_encrypt(ks, encrypt, data): # Get the bytes in the order we want. inp = unpack('8B', data) print inp l = ((inp[0] ) | (inp[1] << 8) | (inp[2] << 16) | (inp[3] << 24)) r = ((inp[4] ) | (inp[5] << 8) | (inp[6] << 16) | (inp[7] << 24)) print (l,r) l &= 0xffffffff r &= 0xffffffff (l, r) = doIP(l, r) if encrypt: # Encryption for i in range(0, 32, 4): t = (((r & 0x7fffffff) << 1) | ((r >> 31) & 0x00000001)) u = t ^ ks[i] t = t ^ ks[i+1] #t2 = ((t & 0x0000000f) << 28) t = (((t >> 4) & 0x0fffffff) | ((t & 0x0000000f) << 28)) l ^= (SP1[ t & 0x3f] | SP3[(t >> 8) & 0x3f] | SP5[(t >> 16) & 0x3f] | SP7[(t >> 24) & 0x3f] | SP0[ u & 0x3f] | SP2[(u >> 8) & 0x3f] | SP4[(u >> 16) & 0x3f] | SP6[(u >> 24) & 0x3f]) t = ((l << 1) | ((l >> 31) & 0x1)) & 0xffffffff u = t ^ ks[i+2] t = t ^ ks[i+3] t = (((t >> 4) & 0x0fffffff) | (t << 28)) & 0xffffffff r ^= (SP1[ t & 0x3f] | SP3[(t >> 8) & 0x3f] | SP5[(t >> 16) & 0x3f] | SP7[(t >> 24) & 0x3f] | SP0[ u & 0x3f] | SP2[(u >> 8) & 0x3f] | SP4[(u >> 16) & 0x3f] | SP6[(u >> 24) & 0x3f]) else: # Decryption for i in range(30, 0, -4): t = ((r << 1) | ((r >> 31) & 0x1)) & 0xffffffff u = t ^ ks[i] t = t ^ ks[i+1] t = (((t >> 4) & 0x0fffffff) | (t << 28)) & 0xffffffff l ^= (SP1[ t & 0x3f] | SP3[(t >> 8) & 0x3f] | SP5[(t >> 16) & 0x3f] | SP7[(t >> 24) & 0x3f] | SP0[ u & 0x3f] | SP2[(u >> 8) & 0x3f] | SP4[(u >> 16) & 0x3f] | SP6[(u >> 24) & 0x3f]) t = ((l << 1) | ((l >> 31) & 0x1)) & 0xffffffff u = t ^ ks[i-2] t = t ^ ks[i-1] t = (((t >> 4) & 0x0fffffff) | (t << 28)) & 0xffffffff r ^= (SP1[ t & 0x3f] | SP3[(t >> 8) & 0x3f] | SP5[(t >> 16) & 0x3f] | SP7[(t >> 24) & 0x3f] | SP0[ u & 0x3f] | SP2[(u >> 8) & 0x3f] | SP4[(u >> 16) & 0x3f] | SP6[(u >> 24) & 0x3f]) # (l, r) = doFP(l, r) output = pack('8B', l & 0xff, (l >> 8) & 0xff, (l >> 16) & 0xff, (l >> 24) & 0xff, r & 0xff, (r >> 8) & 0xff, (r >> 16) & 0xff, (r >> 24) & 0xff) return output # test only: if __name__ == '__main__': ks = des_set_key('test1234') print ks print map(ord, des_ecb_encrypt(ks, 1, 'hello321')) print repr(des_ecb_encrypt(ks, 1, des_ecb_encrypt(ks, 0, 'hello321'))) print repr(des_ecb_encrypt(ks, 0, des_ecb_encrypt(ks, 1, 'hello321')))