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/*
DES implementation; 1995 Tatu Ylonen <ylo@cs.hut.fi>
This implementation is derived from libdes-3.06, which is copyright
(c) 1993 Eric Young, and distributed under the GNU GPL or the ARTISTIC licence
(at the user's option). The original distribution can be found e.g. from
ftp://ftp.dsi.unimi.it/pub/security/crypt/libdes/libdes-3.06.tar.gz.
This implementation is distributed under the same terms. See
libdes-README, libdes-ARTISTIC, and libdes-COPYING for more
information.
A description of the DES algorithm can be found in every modern book on
cryptography and data security, including the following:
Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994.
Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to
Computer Security. Prentice-Hall, 1989.
Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill,
1994.
*/
/*
* $Id: des.c,v 1.1.1.1 1996/02/18 21:38:11 ylo Exp $
* $Log: des.c,v $
* Revision 1.1.1.1 1996/02/18 21:38:11 ylo
* Imported ssh-1.2.13.
*
* Revision 1.2 1995/07/13 01:22:25 ylo
* Added cvs log.
*
* $Endlog$
*/
#include "includes.h"
#include "getput.h"
#include "des.h"
/* Table for key generation. This used to be in sk.h. */
/* Copyright (C) 1993 Eric Young - see README for more details */
static const word32 des_skb[8][64]={
/* 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 },
/* 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 },
/* 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 },
/* 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 },
/* 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 },
/* 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 },
/* 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 },
/* 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 }
};
/* Tables used for executing des. This used to be in spr.h. */
/* Copyright (C) 1993 Eric Young - see README for more details */
static const word32 des_SPtrans[8][64]={
/* nibble 0 */
{ 0x00820200, 0x00020000, 0x80800000, 0x80820200,
0x00800000, 0x80020200, 0x80020000, 0x80800000,
0x80020200, 0x00820200, 0x00820000, 0x80000200,
0x80800200, 0x00800000, 0x00000000, 0x80020000,
0x00020000, 0x80000000, 0x00800200, 0x00020200,
0x80820200, 0x00820000, 0x80000200, 0x00800200,
0x80000000, 0x00000200, 0x00020200, 0x80820000,
0x00000200, 0x80800200, 0x80820000, 0x00000000,
0x00000000, 0x80820200, 0x00800200, 0x80020000,
0x00820200, 0x00020000, 0x80000200, 0x00800200,
0x80820000, 0x00000200, 0x00020200, 0x80800000,
0x80020200, 0x80000000, 0x80800000, 0x00820000,
0x80820200, 0x00020200, 0x00820000, 0x80800200,
0x00800000, 0x80000200, 0x80020000, 0x00000000,
0x00020000, 0x00800000, 0x80800200, 0x00820200,
0x80000000, 0x80820000, 0x00000200, 0x80020200 },
/* nibble 1 */
{ 0x10042004, 0x00000000, 0x00042000, 0x10040000,
0x10000004, 0x00002004, 0x10002000, 0x00042000,
0x00002000, 0x10040004, 0x00000004, 0x10002000,
0x00040004, 0x10042000, 0x10040000, 0x00000004,
0x00040000, 0x10002004, 0x10040004, 0x00002000,
0x00042004, 0x10000000, 0x00000000, 0x00040004,
0x10002004, 0x00042004, 0x10042000, 0x10000004,
0x10000000, 0x00040000, 0x00002004, 0x10042004,
0x00040004, 0x10042000, 0x10002000, 0x00042004,
0x10042004, 0x00040004, 0x10000004, 0x00000000,
0x10000000, 0x00002004, 0x00040000, 0x10040004,
0x00002000, 0x10000000, 0x00042004, 0x10002004,
0x10042000, 0x00002000, 0x00000000, 0x10000004,
0x00000004, 0x10042004, 0x00042000, 0x10040000,
0x10040004, 0x00040000, 0x00002004, 0x10002000,
0x10002004, 0x00000004, 0x10040000, 0x00042000 },
/* nibble 2 */
{ 0x41000000, 0x01010040, 0x00000040, 0x41000040,
0x40010000, 0x01000000, 0x41000040, 0x00010040,
0x01000040, 0x00010000, 0x01010000, 0x40000000,
0x41010040, 0x40000040, 0x40000000, 0x41010000,
0x00000000, 0x40010000, 0x01010040, 0x00000040,
0x40000040, 0x41010040, 0x00010000, 0x41000000,
0x41010000, 0x01000040, 0x40010040, 0x01010000,
0x00010040, 0x00000000, 0x01000000, 0x40010040,
0x01010040, 0x00000040, 0x40000000, 0x00010000,
0x40000040, 0x40010000, 0x01010000, 0x41000040,
0x00000000, 0x01010040, 0x00010040, 0x41010000,
0x40010000, 0x01000000, 0x41010040, 0x40000000,
0x40010040, 0x41000000, 0x01000000, 0x41010040,
0x00010000, 0x01000040, 0x41000040, 0x00010040,
0x01000040, 0x00000000, 0x41010000, 0x40000040,
0x41000000, 0x40010040, 0x00000040, 0x01010000 },
/* nibble 3 */
{ 0x00100402, 0x04000400, 0x00000002, 0x04100402,
0x00000000, 0x04100000, 0x04000402, 0x00100002,
0x04100400, 0x04000002, 0x04000000, 0x00000402,
0x04000002, 0x00100402, 0x00100000, 0x04000000,
0x04100002, 0x00100400, 0x00000400, 0x00000002,
0x00100400, 0x04000402, 0x04100000, 0x00000400,
0x00000402, 0x00000000, 0x00100002, 0x04100400,
0x04000400, 0x04100002, 0x04100402, 0x00100000,
0x04100002, 0x00000402, 0x00100000, 0x04000002,
0x00100400, 0x04000400, 0x00000002, 0x04100000,
0x04000402, 0x00000000, 0x00000400, 0x00100002,
0x00000000, 0x04100002, 0x04100400, 0x00000400,
0x04000000, 0x04100402, 0x00100402, 0x00100000,
0x04100402, 0x00000002, 0x04000400, 0x00100402,
0x00100002, 0x00100400, 0x04100000, 0x04000402,
0x00000402, 0x04000000, 0x04000002, 0x04100400 },
/* nibble 4 */
{ 0x02000000, 0x00004000, 0x00000100, 0x02004108,
0x02004008, 0x02000100, 0x00004108, 0x02004000,
0x00004000, 0x00000008, 0x02000008, 0x00004100,
0x02000108, 0x02004008, 0x02004100, 0x00000000,
0x00004100, 0x02000000, 0x00004008, 0x00000108,
0x02000100, 0x00004108, 0x00000000, 0x02000008,
0x00000008, 0x02000108, 0x02004108, 0x00004008,
0x02004000, 0x00000100, 0x00000108, 0x02004100,
0x02004100, 0x02000108, 0x00004008, 0x02004000,
0x00004000, 0x00000008, 0x02000008, 0x02000100,
0x02000000, 0x00004100, 0x02004108, 0x00000000,
0x00004108, 0x02000000, 0x00000100, 0x00004008,
0x02000108, 0x00000100, 0x00000000, 0x02004108,
0x02004008, 0x02004100, 0x00000108, 0x00004000,
0x00004100, 0x02004008, 0x02000100, 0x00000108,
0x00000008, 0x00004108, 0x02004000, 0x02000008 },
/* nibble 5 */
{ 0x20000010, 0x00080010, 0x00000000, 0x20080800,
0x00080010, 0x00000800, 0x20000810, 0x00080000,
0x00000810, 0x20080810, 0x00080800, 0x20000000,
0x20000800, 0x20000010, 0x20080000, 0x00080810,
0x00080000, 0x20000810, 0x20080010, 0x00000000,
0x00000800, 0x00000010, 0x20080800, 0x20080010,
0x20080810, 0x20080000, 0x20000000, 0x00000810,
0x00000010, 0x00080800, 0x00080810, 0x20000800,
0x00000810, 0x20000000, 0x20000800, 0x00080810,
0x20080800, 0x00080010, 0x00000000, 0x20000800,
0x20000000, 0x00000800, 0x20080010, 0x00080000,
0x00080010, 0x20080810, 0x00080800, 0x00000010,
0x20080810, 0x00080800, 0x00080000, 0x20000810,
0x20000010, 0x20080000, 0x00080810, 0x00000000,
0x00000800, 0x20000010, 0x20000810, 0x20080800,
0x20080000, 0x00000810, 0x00000010, 0x20080010 },
/* nibble 6 */
{ 0x00001000, 0x00000080, 0x00400080, 0x00400001,
0x00401081, 0x00001001, 0x00001080, 0x00000000,
0x00400000, 0x00400081, 0x00000081, 0x00401000,
0x00000001, 0x00401080, 0x00401000, 0x00000081,
0x00400081, 0x00001000, 0x00001001, 0x00401081,
0x00000000, 0x00400080, 0x00400001, 0x00001080,
0x00401001, 0x00001081, 0x00401080, 0x00000001,
0x00001081, 0x00401001, 0x00000080, 0x00400000,
0x00001081, 0x00401000, 0x00401001, 0x00000081,
0x00001000, 0x00000080, 0x00400000, 0x00401001,
0x00400081, 0x00001081, 0x00001080, 0x00000000,
0x00000080, 0x00400001, 0x00000001, 0x00400080,
0x00000000, 0x00400081, 0x00400080, 0x00001080,
0x00000081, 0x00001000, 0x00401081, 0x00400000,
0x00401080, 0x00000001, 0x00001001, 0x00401081,
0x00400001, 0x00401080, 0x00401000, 0x00001001 },
/* nibble 7 */
{ 0x08200020, 0x08208000, 0x00008020, 0x00000000,
0x08008000, 0x00200020, 0x08200000, 0x08208020,
0x00000020, 0x08000000, 0x00208000, 0x00008020,
0x00208020, 0x08008020, 0x08000020, 0x08200000,
0x00008000, 0x00208020, 0x00200020, 0x08008000,
0x08208020, 0x08000020, 0x00000000, 0x00208000,
0x08000000, 0x00200000, 0x08008020, 0x08200020,
0x00200000, 0x00008000, 0x08208000, 0x00000020,
0x00200000, 0x00008000, 0x08000020, 0x08208020,
0x00008020, 0x08000000, 0x00000000, 0x00208000,
0x08200020, 0x08008020, 0x08008000, 0x00200020,
0x08208000, 0x00000020, 0x00200020, 0x08008000,
0x08208020, 0x00200000, 0x08200000, 0x08000020,
0x00208000, 0x00008020, 0x08008020, 0x08200000,
0x00000020, 0x08208000, 0x00208020, 0x00000000,
0x08000000, 0x08200020, 0x00008000, 0x00208020 }};
/* Some stuff that used to be in des_locl.h. Heavily modified. */
/* IP and FP
* The problem is more of a geometric problem that random bit fiddling.
0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6
8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4
16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2
24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0
32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7
40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5
48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3
56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1
The output has been subject to swaps of the form
0 1 -> 3 1 but the odd and even bits have been put into
2 3 2 0
different words. The main trick is to remember that
t=((l>>size)^r)&(mask);
r^=t;
l^=(t<<size);
can be used to swap and move bits between words.
So l = 0 1 2 3 r = 16 17 18 19
4 5 6 7 20 21 22 23
8 9 10 11 24 25 26 27
12 13 14 15 28 29 30 31
becomes (for size == 2 and mask == 0x3333)
t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19
6^20 7^21 -- -- 4 5 20 21 6 7 22 23
10^24 11^25 -- -- 8 9 24 25 10 11 24 25
14^28 15^29 -- -- 12 13 28 29 14 15 28 29
Thanks for hints from Richard Outerbridge - he told me IP&FP
could be done in 15 xor, 10 shifts and 5 ands.
When I finally started to think of the problem in 2D
I first got ~42 operations without xors. When I remembered
how to use xors :-) I got it to its final state.
*/
#define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
(b)^=(t),\
(a)^=((t)<<(n)))
#define IP(l,r,t) \
PERM_OP(r,l,t, 4,0x0f0f0f0f); \
PERM_OP(l,r,t,16,0x0000ffff); \
PERM_OP(r,l,t, 2,0x33333333); \
PERM_OP(l,r,t, 8,0x00ff00ff); \
PERM_OP(r,l,t, 1,0x55555555);
#define FP(l,r,t) \
PERM_OP(l,r,t, 1,0x55555555); \
PERM_OP(r,l,t, 8,0x00ff00ff); \
PERM_OP(l,r,t, 2,0x33333333); \
PERM_OP(r,l,t,16,0x0000ffff); \
PERM_OP(l,r,t, 4,0x0f0f0f0f);
#define D_ENCRYPT(L,R,S) \
u=(R^s[S ]); \
t=R^s[S+1]; \
t=((t>>4)+(t<<28)); \
L^= des_SPtrans[1][(t )&0x3f]| \
des_SPtrans[3][(t>> 8)&0x3f]| \
des_SPtrans[5][(t>>16)&0x3f]| \
des_SPtrans[7][(t>>24)&0x3f]| \
des_SPtrans[0][(u )&0x3f]| \
des_SPtrans[2][(u>> 8)&0x3f]| \
des_SPtrans[4][(u>>16)&0x3f]| \
des_SPtrans[6][(u>>24)&0x3f];
/* This part is based on code that used to be in ecb_enc.c. */
/* Copyright (C) 1993 Eric Young - see README for more details */
void des_encrypt(word32 l, word32 r, word32 *output, DESContext *ks,
int encrypt)
{
register word32 t,u;
register int i;
register word32 *s;
s = ks->key_schedule;
IP(l,r,t);
/* Things have been modified so that the initial rotate is
* done outside the loop. This required the
* des_SPtrans values in sp.h to be rotated 1 bit to the right.
* One perl script later and things have a 5% speed up on a sparc2.
* Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
* for pointing this out. */
t=(r<<1)|(r>>31);
r=(l<<1)|(l>>31);
l=t;
/* I don't know if it is worth the effort of loop unrolling the
* inner loop */
if (encrypt)
{
for (i=0; i<32; i+=4)
{
D_ENCRYPT(l,r,i+0); /* 1 */
D_ENCRYPT(r,l,i+2); /* 2 */
}
}
else
{
for (i=30; i>0; i-=4)
{
D_ENCRYPT(l,r,i-0); /* 16 */
D_ENCRYPT(r,l,i-2); /* 15 */
}
}
l=(l>>1)|(l<<31);
r=(r>>1)|(r<<31);
FP(r,l,t);
output[0]=l;
output[1]=r;
}
/* Code based on set_key.c. */
/* Copyright (C) 1993 Eric Young - see README for more details */
#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
(a)=(a)^(t)^(t>>(16-(n))))
void des_set_key(unsigned char *key, DESContext *ks)
{
register word32 c, d, t, s, shifts;
register int i;
register word32 *schedule;
schedule = ks->key_schedule;
c = GET_32BIT_LSB_FIRST(key);
d = GET_32BIT_LSB_FIRST(key + 4);
/* I now do it in 47 simple operations :-)
* Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
* for the inspiration. :-) */
PERM_OP(d,c,t,4,0x0f0f0f0f);
HPERM_OP(c,t,-2,0xcccc0000);
HPERM_OP(d,t,-2,0xcccc0000);
PERM_OP(d,c,t,1,0x55555555);
PERM_OP(c,d,t,8,0x00ff00ff);
PERM_OP(d,c,t,1,0x55555555);
d = ((d & 0xff) << 16) | (d & 0xff00) |
((d >> 16) & 0xff) | ((c >> 4) & 0xf000000);
c&=0x0fffffff;
shifts = 0x7efc;
for (i=0; i < 16; i++)
{
if (shifts & 1)
{ c=((c>>2)|(c<<26)); d=((d>>2)|(d<<26)); }
else
{ c=((c>>1)|(c<<27)); d=((d>>1)|(d<<27)); }
shifts >>= 1;
c&=0x0fffffff;
d&=0x0fffffff;
/* could be a few less shifts but I am to lazy at this
* point in time to investigate */
s = des_skb[0][ (c )&0x3f ] |
des_skb[1][((c>> 6)&0x03)|((c>> 7)&0x3c)] |
des_skb[2][((c>>13)&0x0f)|((c>>14)&0x30)] |
des_skb[3][((c>>20)&0x01)|((c>>21)&0x06)|((c>>22)&0x38)];
t = des_skb[4][ (d )&0x3f ] |
des_skb[5][((d>> 7)&0x03)|((d>> 8)&0x3c)] |
des_skb[6][ (d>>15)&0x3f ] |
des_skb[7][((d>>21)&0x0f)|((d>>22)&0x30)];
/* table contained 0213 4657 */
*schedule++ = ((t << 16) | (s & 0xffff));
s = ((s >> 16) | (t & 0xffff0000));
*schedule++ = (s << 4) | (s >> 28);
}
}
void des_cbc_encrypt(DESContext *ks, unsigned char *iv,
unsigned char *dest, const unsigned char *src,
unsigned int len)
{
word32 iv0, iv1, out[2];
unsigned int i;
assert((len & 7) == 0);
iv0 = GET_32BIT_LSB_FIRST(iv);
iv1 = GET_32BIT_LSB_FIRST(iv + 4);
for (i = 0; i < len; i += 8)
{
iv0 ^= GET_32BIT_LSB_FIRST(src + i);
iv1 ^= GET_32BIT_LSB_FIRST(src + i + 4);
des_encrypt(iv0, iv1, out, ks, 1);
iv0 = out[0];
iv1 = out[1];
PUT_32BIT_LSB_FIRST(dest + i, iv0);
PUT_32BIT_LSB_FIRST(dest + i + 4, iv1);
}
PUT_32BIT_LSB_FIRST(iv, iv0);
PUT_32BIT_LSB_FIRST(iv + 4, iv1);
}
void des_cbc_decrypt(DESContext *ks, unsigned char *iv,
unsigned char *dest, const unsigned char *src,
unsigned int len)
{
word32 iv0, iv1, d0, d1, out[2];
unsigned int i;
assert((len & 7) == 0);
iv0 = GET_32BIT_LSB_FIRST(iv);
iv1 = GET_32BIT_LSB_FIRST(iv + 4);
for (i = 0; i < len; i += 8)
{
d0 = GET_32BIT_LSB_FIRST(src + i);
d1 = GET_32BIT_LSB_FIRST(src + i + 4);
des_encrypt(d0, d1, out, ks, 0);
iv0 ^= out[0];
iv1 ^= out[1];
PUT_32BIT_LSB_FIRST(dest + i, iv0);
PUT_32BIT_LSB_FIRST(dest + i + 4, iv1);
iv0 = d0;
iv1 = d1;
}
PUT_32BIT_LSB_FIRST(iv, iv0);
PUT_32BIT_LSB_FIRST(iv + 4, iv1);
}
void des_3cbc_encrypt(DESContext *ks1, unsigned char *iv1,
DESContext *ks2, unsigned char *iv2,
DESContext *ks3, unsigned char *iv3,
unsigned char *dest, const unsigned char *src,
unsigned int len)
{
des_cbc_encrypt(ks1, iv1, dest, src, len);
des_cbc_decrypt(ks2, iv2, dest, dest, len);
des_cbc_encrypt(ks3, iv3, dest, dest, len);
}
void des_3cbc_decrypt(DESContext *ks1, unsigned char *iv1,
DESContext *ks2, unsigned char *iv2,
DESContext *ks3, unsigned char *iv3,
unsigned char *dest, const unsigned char *src,
unsigned int len)
{
des_cbc_decrypt(ks3, iv3, dest, src, len);
des_cbc_encrypt(ks2, iv2, dest, dest, len);
des_cbc_decrypt(ks1, iv1, dest, dest, len);
}
#ifdef DES_TEST
void des_encrypt_buf(DESContext *ks, unsigned char *out,
const unsigned char *in, int encrypt)
{
word32 in0, in1, output[0];
in0 = GET_32BIT_LSB_FIRST(in);
in1 = GET_32BIT_LSB_FIRST(in + 4);
des_encrypt(in0, in1, output, ks, encrypt);
PUT_32BIT_LSB_FIRST(out, output[0]);
PUT_32BIT_LSB_FIRST(out + 4, output[1]);
}
int main(int ac, char **av)
{
FILE *f;
char line[1024], *cp;
int i, value;
unsigned char key[8], data[8], result[8], output[8];
DESContext ks;
while (fgets(line, sizeof(line), stdin))
{
for (i = 0; i < 8; i++)
{
if (sscanf(line + 2 * i, "%02x", &value) != 1)
{
fprintf(stderr, "1st col, i = %d, line: %s", i, line);
exit(1);
}
key[i] = value;
}
for (i = 0; i < 8; i++)
{
if (sscanf(line + 2 * i + 17, "%02x", &value) != 1)
{
fprintf(stderr, "2nd col, i = %d, line: %s", i, line);
exit(1);
}
data[i] = value;
}
for (i = 0; i < 8; i++)
{
if (sscanf(line + 2 * i + 2*17, "%02x", &value) != 1)
{
fprintf(stderr, "3rd col, i = %d, line: %s", i, line);
exit(1);
}
result[i] = value;
}
des_set_key(key, &ks);
des_encrypt_buf(&ks, output, data, 1);
if (memcmp(output, result, 8) != 0)
fprintf(stderr, "Encrypt failed: %s", line);
des_encrypt_buf(&ks, output, result, 0);
if (memcmp(output, data, 8) != 0)
fprintf(stderr, "Decrypt failed: %s", line);
}
exit(0);
}
#endif /* DES_TEST */
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.