814 lines
16 KiB
C
814 lines
16 KiB
C
/*++
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Copyright (c) 1987-1994 Microsoft Corporation
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Module Name:
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arapdes.c
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Abstract:
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This module implements the ARAP-specific authentication that is called in
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by the subauthentication package if the protocol type is ARAP.
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This code is adapted from fcr's des code
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Author:
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Shirish Koti 28-Feb-97
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Revisions:
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--*/
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/*
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* Sofware DES functions
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* written 12 Dec 1986 by Phil Karn, KA9Q; large sections adapted from
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* the 1977 public-domain program by Jim Gillogly
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*/
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// #include "compiler.h"
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#include <windows.h>
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//#include <ntddk.h>
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//#include <ntdef.h>
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//#define NULL 0
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unsigned long byteswap();
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CRITICAL_SECTION ArapDesLock;
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VOID
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des_done(
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IN VOID
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);
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VOID
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des_setkey(
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IN PCHAR key // 64 bits (will use only 56)
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);
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VOID
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des_endes(
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IN PCHAR block
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);
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VOID
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des_dedes(
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IN PCHAR block
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);
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static
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VOID
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permute(
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IN PCHAR inblock, // result into outblock,64 bits
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IN CHAR perm[16][16][8], // 2K bytes defining perm.
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IN PCHAR outblock // result into outblock,64 bits
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);
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static
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VOID
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round(
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IN int num,
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IN unsigned long *block
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);
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static long f (unsigned long r, unsigned char subkey[8]);
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static
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VOID
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perminit(
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IN CHAR perm[16][16][8],
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IN CHAR p[64]
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);
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static int spinit();
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PCHAR
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des_pw_bitshift(
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IN PCHAR pw
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);
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PCHAR
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des_pw_bitshift_lowbit(
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IN PCHAR pw
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);
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//
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// Tables defined in the Data Encryption Standard documents */
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//
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//
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// initial permutation IP
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//
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static char ip[] =
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{
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58, 50, 42, 34, 26, 18, 10, 2,
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60, 52, 44, 36, 28, 20, 12, 4,
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62, 54, 46, 38, 30, 22, 14, 6,
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64, 56, 48, 40, 32, 24, 16, 8,
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57, 49, 41, 33, 25, 17, 9, 1,
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59, 51, 43, 35, 27, 19, 11, 3,
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61, 53, 45, 37, 29, 21, 13, 5,
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63, 55, 47, 39, 31, 23, 15, 7
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};
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//
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// final permutation IP^-1
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//
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static char fp[] =
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{
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40, 8, 48, 16, 56, 24, 64, 32,
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39, 7, 47, 15, 55, 23, 63, 31,
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38, 6, 46, 14, 54, 22, 62, 30,
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37, 5, 45, 13, 53, 21, 61, 29,
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36, 4, 44, 12, 52, 20, 60, 28,
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35, 3, 43, 11, 51, 19, 59, 27,
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34, 2, 42, 10, 50, 18, 58, 26,
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33, 1, 41, 9, 49, 17, 57, 25
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};
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/* expansion operation matrix
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* This is for reference only; it is unused in the code
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* as the f() function performs it implicitly for speed
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*/
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#ifdef notdef
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static char ei[] =
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{
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32, 1, 2, 3, 4, 5,
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4, 5, 6, 7, 8, 9,
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8, 9, 10, 11, 12, 13,
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12, 13, 14, 15, 16, 17,
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16, 17, 18, 19, 20, 21,
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20, 21, 22, 23, 24, 25,
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24, 25, 26, 27, 28, 29,
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28, 29, 30, 31, 32, 1
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};
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#endif
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//
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// permuted choice table (key)
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//
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static char pc1[] =
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{
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57, 49, 41, 33, 25, 17, 9,
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1, 58, 50, 42, 34, 26, 18,
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10, 2, 59, 51, 43, 35, 27,
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19, 11, 3, 60, 52, 44, 36,
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63, 55, 47, 39, 31, 23, 15,
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7, 62, 54, 46, 38, 30, 22,
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14, 6, 61, 53, 45, 37, 29,
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21, 13, 5, 28, 20, 12, 4
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};
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//
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// number left rotations of pc1
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//
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static char totrot[] =
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{
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1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28
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};
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//
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// permuted choice key (table)
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//
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static char pc2[] =
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{
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14, 17, 11, 24, 1, 5,
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3, 28, 15, 6, 21, 10,
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23, 19, 12, 4, 26, 8,
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16, 7, 27, 20, 13, 2,
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41, 52, 31, 37, 47, 55,
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30, 40, 51, 45, 33, 48,
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44, 49, 39, 56, 34, 53,
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46, 42, 50, 36, 29, 32
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};
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//
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// The (in)famous S-boxes
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//
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static char si[8][64] =
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{
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//
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// S1
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//
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14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
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0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
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4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
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15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13,
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//
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// S2
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//
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15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
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3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
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0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
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13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9,
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//
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// S3
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//
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10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
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13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
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13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
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1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12,
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//
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// S4
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//
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7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
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13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
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10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
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3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14,
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//
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// S5
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//
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2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
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14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
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4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
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11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3,
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//
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// S6
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//
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12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
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10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
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9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
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4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13,
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//
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// S7
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//
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4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
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13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
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1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
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6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12,
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//
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// S8
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//
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13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
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1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
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7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
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2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
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};
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//
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// 32-bit permutation function P used on the output of the S-boxes
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//
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static char p32i[] =
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{
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16, 7, 20, 21,
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29, 12, 28, 17,
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1, 15, 23, 26,
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5, 18, 31, 10,
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2, 8, 24, 14,
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32, 27, 3, 9,
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19, 13, 30, 6,
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22, 11, 4, 25
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};
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//
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// End of DES-defined tables
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//
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//
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// Lookup tables initialized once only at startup by desinit()
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//
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static long (*sp)[64]; // Combined S and P boxes
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static char (*iperm)[16][8]; // Initial and final permutations
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static char (*fperm)[16][8];
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//
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// 8 6-bit subkeys for each of 16 rounds, initialized by setkey()
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//
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static unsigned char (*kn)[8];
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//
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// bit 0 is left-most in byte
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//
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static int bytebit[] =
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{
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0200,0100,040,020,010,04,02,01
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};
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static int nibblebit[] =
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{
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010,04,02,01
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};
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static int desmode;
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/* Allocate space and initialize DES lookup arrays
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* mode == 0: standard Data Encryption Algorithm
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* mode == 1: DEA without initial and final permutations for speed
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* mode == 2: DEA without permutations and with 128-byte key (completely
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* independent subkeys for each round)
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*/
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des_init(mode)
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int mode;
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{
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if(sp != NULL)
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{
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// Already initialized
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return 0;
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}
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desmode = mode;
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sp = (long (*)[64])LocalAlloc(LMEM_FIXED, (sizeof(long) * 8 * 64));
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if(sp == NULL)
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{
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return -1;
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}
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spinit();
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kn = (unsigned char (*)[8])LocalAlloc(LMEM_FIXED, (sizeof(char) * 8 * 16));
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if(kn == NULL)
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{
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LocalFree((char *)sp);
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return -1;
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}
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if(mode == 1 || mode == 2) // No permutations
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return 0;
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iperm = (char (*)[16][8])
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LocalAlloc(LMEM_FIXED, (sizeof(char) * 16 * 16 * 8));
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if(iperm == NULL)
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{
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LocalFree((char *)sp);
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LocalFree((char *)kn);
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return -1;
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}
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perminit(iperm,ip);
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fperm = (char (*)[16][8])
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LocalAlloc(LMEM_FIXED, (sizeof(char) * 16 * 16 * 8));
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if(fperm == NULL)
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{
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LocalFree((char *)sp);
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LocalFree((char *)kn);
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LocalFree((char *)iperm);
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return -1;
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}
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perminit(fperm,fp);
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return 0;
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}
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//
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// Free up storage used by DES
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//
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VOID
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des_done(
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IN VOID
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)
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{
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if(sp == NULL)
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return; // Already done
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LocalFree((char *)sp);
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LocalFree((char *)kn);
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if(iperm != NULL)
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LocalFree((char *)iperm);
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if(fperm != NULL)
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LocalFree((char *)fperm);
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sp = NULL;
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iperm = NULL;
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fperm = NULL;
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kn = NULL;
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}
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//
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// Set key (initialize key schedule array)
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//
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VOID
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des_setkey(
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IN PCHAR key // 64 bits (will use only 56)
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)
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{
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char pc1m[56]; /* place to modify pc1 into */
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char pcr[56]; /* place to rotate pc1 into */
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register int i,j,l;
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int m;
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/* In mode 2, the 128 bytes of subkey are set directly from the
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* user's key, allowing him to use completely independent
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* subkeys for each round. Note that the user MUST specify a
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* full 128 bytes.
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*
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* I would like to think that this technique gives the NSA a real
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* headache, but I'm not THAT naive.
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*/
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if(desmode == 2)
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{
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for(i=0;i<16;i++)
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for(j=0;j<8;j++)
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kn[i][j] = *key++;
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return;
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}
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//
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// Clear key schedule
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//
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for (i=0; i<16; i++)
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for (j=0; j<8; j++)
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kn[i][j]=0;
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for (j=0; j<56; j++) /* convert pc1 to bits of key */
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{
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l=pc1[j]-1; /* integer bit location */
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m = l & 07; /* find bit */
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pc1m[j]=(key[l>>3] & /* find which key byte l is in */
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bytebit[m]) /* and which bit of that byte */
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? 1 : 0; /* and store 1-bit result */
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}
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for (i=0; i<16; i++) /* key chunk for each iteration */
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{
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for (j=0; j<56; j++) /* rotate pc1 the right amount */
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pcr[j] = pc1m[(l=j+totrot[i])<(j<28? 28 : 56) ? l: l-28];
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/* rotate left and right halves independently */
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for (j=0; j<48; j++)
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{ /* select bits individually */
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/* check bit that goes to kn[j] */
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if (pcr[pc2[j]-1])
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{
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/* mask it in if it's there */
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l= j % 6;
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kn[i][j/6] |= bytebit[l] >> 2;
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}
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}
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}
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}
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//
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// In-place encryption of 64-bit block
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//
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VOID
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des_endes(
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IN PCHAR block
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)
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{
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register int i;
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unsigned long work[2]; /* Working data storage */
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long tmp;
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permute(block,iperm,(char *)work); /* Initial Permutation */
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work[0] = byteswap(work[0]);
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work[1] = byteswap(work[1]);
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/* Do the 16 rounds */
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for (i=0; i<16; i++)
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round(i,work);
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/* Left/right half swap */
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tmp = work[0];
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work[0] = work[1];
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work[1] = tmp;
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work[0] = byteswap(work[0]);
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work[1] = byteswap(work[1]);
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permute((char *)work,fperm,block); /* Inverse initial permutation */
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}
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//
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// In-place decryption of 64-bit block
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//
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VOID
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des_dedes(
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IN PCHAR block
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)
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{
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register int i;
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unsigned long work[2]; /* Working data storage */
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long tmp;
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permute(block,iperm,(char *)work); /* Initial permutation */
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work[0] = byteswap(work[0]);
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work[1] = byteswap(work[1]);
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/* Left/right half swap */
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tmp = work[0];
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work[0] = work[1];
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work[1] = tmp;
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/* Do the 16 rounds in reverse order */
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for (i=15; i >= 0; i--)
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round(i,work);
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work[0] = byteswap(work[0]);
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work[1] = byteswap(work[1]);
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permute((char *)work,fperm,block); /* Inverse initial permutation */
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}
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PCHAR
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des_pw_bitshift(
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IN PCHAR pw
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)
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{
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static char pws[8];
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int i;
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/* key is null padded */
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for (i = 0; i < 8; i++)
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pws[i] = 0;
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/* parity bit is always zero (this seem bogus) */
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for (i = 0; i < 8 && pw[i]; i++)
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pws[i] = pw[i] << 1;
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return pws;
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}
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PCHAR
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des_pw_bitshift_lowbit(
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IN PCHAR pw
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)
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{
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static char pws[8];
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int i;
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/* key is null padded */
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for (i = 0; i < 8; i++)
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pws[i] = 0;
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// In case of RandNum authentication, we need to drop the low bit!
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for (i = 0; i < 8 && pw[i]; i++)
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{
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pws[i] = (pw[i] & 0x7F);
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}
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return pws;
|
|
}
|
|
|
|
//
|
|
// Permute inblock with perm
|
|
//
|
|
static
|
|
VOID
|
|
permute(
|
|
IN PCHAR inblock, // result into outblock,64 bits
|
|
IN CHAR perm[16][16][8], // 2K bytes defining perm.
|
|
IN PCHAR outblock // result into outblock,64 bits
|
|
)
|
|
{
|
|
register int i,j;
|
|
register char *ib, *ob; /* ptr to input or output block */
|
|
register char *p, *q;
|
|
|
|
if(perm == NULL)
|
|
{
|
|
/* No permutation, just copy */
|
|
for(i=8; i!=0; i--)
|
|
*outblock++ = *inblock++;
|
|
return;
|
|
}
|
|
/* Clear output block */
|
|
for (i=8, ob = outblock; i != 0; i--)
|
|
*ob++ = 0;
|
|
|
|
ib = inblock;
|
|
for (j = 0; j < 16; j += 2, ib++) /* for each input nibble */
|
|
{
|
|
ob = outblock;
|
|
p = perm[j][(*ib >> 4) & 017];
|
|
q = perm[j + 1][*ib & 017];
|
|
for (i = 8; i != 0; i--) /* and each output byte */
|
|
{
|
|
*ob++ |= *p++ | *q++; /* OR the masks together*/
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Do one DES cipher round
|
|
//
|
|
static
|
|
VOID
|
|
round(
|
|
IN int num, // i.e. the num-th one
|
|
IN unsigned long *block
|
|
)
|
|
{
|
|
long f();
|
|
|
|
/* The rounds are numbered from 0 to 15. On even rounds
|
|
* the right half is fed to f() and the result exclusive-ORs
|
|
* the left half; on odd rounds the reverse is done.
|
|
*/
|
|
if(num & 1)
|
|
{
|
|
block[1] ^= f(block[0],kn[num]);
|
|
} else
|
|
{
|
|
block[0] ^= f(block[1],kn[num]);
|
|
}
|
|
}
|
|
|
|
|
|
//
|
|
// The nonlinear function f(r,k), the heart of DES
|
|
//
|
|
static
|
|
long
|
|
f(r,subkey)
|
|
unsigned long r; /* 32 bits */
|
|
unsigned char subkey[8]; /* 48-bit key for this round */
|
|
{
|
|
register unsigned long rval,rt;
|
|
#ifdef TRACE
|
|
unsigned char *cp;
|
|
int i;
|
|
|
|
printf("f(%08lx, %02x %02x %02x %02x %02x %02x %02x %02x) = ",
|
|
r,
|
|
subkey[0], subkey[1], subkey[2],
|
|
subkey[3], subkey[4], subkey[5],
|
|
subkey[6], subkey[7]);
|
|
#endif
|
|
/* Run E(R) ^ K through the combined S & P boxes
|
|
* This code takes advantage of a convenient regularity in
|
|
* E, namely that each group of 6 bits in E(R) feeding
|
|
* a single S-box is a contiguous segment of R.
|
|
*/
|
|
rt = (r >> 1) | ((r & 1) ? 0x80000000 : 0);
|
|
rval = 0;
|
|
rval |= sp[0][((rt >> 26) ^ *subkey++) & 0x3f];
|
|
rval |= sp[1][((rt >> 22) ^ *subkey++) & 0x3f];
|
|
rval |= sp[2][((rt >> 18) ^ *subkey++) & 0x3f];
|
|
rval |= sp[3][((rt >> 14) ^ *subkey++) & 0x3f];
|
|
rval |= sp[4][((rt >> 10) ^ *subkey++) & 0x3f];
|
|
rval |= sp[5][((rt >> 6) ^ *subkey++) & 0x3f];
|
|
rval |= sp[6][((rt >> 2) ^ *subkey++) & 0x3f];
|
|
rt = (r << 1) | ((r & 0x80000000) ? 1 : 0);
|
|
rval |= sp[7][(rt ^ *subkey) & 0x3f];
|
|
#ifdef TRACE
|
|
printf(" %08lx\n",rval);
|
|
#endif
|
|
return rval;
|
|
}
|
|
//
|
|
// initialize a perm array
|
|
//
|
|
static
|
|
VOID
|
|
perminit(
|
|
IN CHAR perm[16][16][8], // 64-bit, either init or final
|
|
IN CHAR p[64]
|
|
)
|
|
{
|
|
register int l, j, k;
|
|
int i,m;
|
|
|
|
/* Clear the permutation array */
|
|
for (i=0; i<16; i++)
|
|
for (j=0; j<16; j++)
|
|
for (k=0; k<8; k++)
|
|
perm[i][j][k]=0;
|
|
|
|
for (i=0; i<16; i++) /* each input nibble position */
|
|
for (j = 0; j < 16; j++)/* each possible input nibble */
|
|
for (k = 0; k < 64; k++)/* each output bit position */
|
|
{ l = p[k] - 1; /* where does this bit come from*/
|
|
if ((l >> 2) != i) /* does it come from input posn?*/
|
|
continue; /* if not, bit k is 0 */
|
|
if (!(j & nibblebit[l & 3]))
|
|
continue; /* any such bit in input? */
|
|
m = k & 07; /* which bit is this in the byte*/
|
|
perm[i][j][k>>3] |= bytebit[m];
|
|
}
|
|
}
|
|
|
|
//
|
|
// Initialize the lookup table for the combined S and P boxes
|
|
//
|
|
static int
|
|
spinit()
|
|
{
|
|
char pbox[32];
|
|
int p,i,s,j,rowcol;
|
|
long val;
|
|
|
|
/* Compute pbox, the inverse of p32i.
|
|
* This is easier to work with
|
|
*/
|
|
for(p=0;p<32;p++)
|
|
{
|
|
for(i=0;i<32;i++)
|
|
{
|
|
if(p32i[i]-1 == p)
|
|
{
|
|
pbox[p] = (char)i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
for(s = 0; s < 8; s++)
|
|
{ /* For each S-box */
|
|
for(i=0; i<64; i++)
|
|
{ /* For each possible input */
|
|
val = 0;
|
|
/* The row number is formed from the first and last
|
|
* bits; the column number is from the middle 4
|
|
*/
|
|
rowcol = (i & 32) | ((i & 1) ? 16 : 0) | ((i >> 1) & 0xf);
|
|
for(j=0;j<4;j++)
|
|
{ /* For each output bit */
|
|
if(si[s][rowcol] & (8 >> j))
|
|
{
|
|
val |= 1L << (31 - pbox[4*s + j]);
|
|
}
|
|
}
|
|
sp[s][i] = val;
|
|
|
|
#ifdef DEBUG
|
|
printf("sp[%d][%2d] = %08lx\n",s,i,sp[s][i]);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
|
|
/* Byte swap a long */
|
|
static
|
|
unsigned long
|
|
byteswap(x)
|
|
unsigned long x;
|
|
{
|
|
register char *cp,tmp;
|
|
|
|
cp = (char *)&x;
|
|
tmp = cp[3];
|
|
cp[3] = cp[0];
|
|
cp[0] = tmp;
|
|
|
|
tmp = cp[2];
|
|
cp[2] = cp[1];
|
|
cp[1] = tmp;
|
|
|
|
return x;
|
|
}
|
|
|
|
|
|
|
|
VOID
|
|
DoTheDESEncrypt(
|
|
IN OUT PCHAR ChallengeBuf
|
|
)
|
|
{
|
|
des_endes(ChallengeBuf);
|
|
}
|
|
|
|
|
|
VOID
|
|
DoTheDESDecrypt(
|
|
IN OUT PCHAR ChallengeBuf
|
|
)
|
|
{
|
|
des_dedes(ChallengeBuf);
|
|
}
|
|
|
|
|
|
VOID
|
|
DoDesInit(
|
|
IN PCHAR pClrTxtPwd,
|
|
IN BOOLEAN DropHighBit // do we need to drop high bit in key-generation?
|
|
)
|
|
{
|
|
des_init(0);
|
|
|
|
if (DropHighBit)
|
|
{
|
|
des_setkey(des_pw_bitshift(pClrTxtPwd));
|
|
}
|
|
else
|
|
{
|
|
des_setkey(des_pw_bitshift_lowbit(pClrTxtPwd));
|
|
}
|
|
|
|
}
|
|
|
|
VOID
|
|
DoDesEnd(
|
|
IN VOID
|
|
)
|
|
{
|
|
des_done();
|
|
}
|