crypt.c

/*
|| This file is part of Pike. For copyright information see COPYRIGHT.
|| Pike is distributed under GPL, LGPL and MPL. See the file COPYING
|| for more information.
|| $Id: crypt.c,v 1.9 2003/12/07 19:42:03 marcus Exp $
*/

/*
 *      From Andy Tanenbaum's book "Computer Networks",
 *      rewritten in C
 */

struct block {
        unsigned char b_data[64];
};

struct ordering {
        unsigned char o_data[64];
};

static struct block key;

static struct ordering InitialTr = {
        58,50,42,34,26,18,10, 2,60,52,44,36,28,20,12, 4,
        62,54,46,38,30,22,14, 6,64,56,48,40,32,24,16, 8,
        57,49,41,33,25,17, 9, 1,59,51,43,35,27,19,11, 3,
        61,53,45,37,29,21,13, 5,63,55,47,39,31,23,15, 7,
};

static struct ordering FinalTr = {
        40, 8,48,16,56,24,64,32,39, 7,47,15,55,23,63,31,
        38, 6,46,14,54,22,62,30,37, 5,45,13,53,21,61,29,
        36, 4,44,12,52,20,60,28,35, 3,43,11,51,19,59,27,
        34, 2,42,10,50,18,58,26,33, 1,41, 9,49,17,57,25,
};

static struct ordering swap = {
        33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
        49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,
         1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16,
        17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,
};

static struct ordering KeyTr1 = {
        57,49,41,33,25,17, 9, 1,58,50,42,34,26,18,
        10, 2,59,51,43,35,27,19,11, 3,60,52,44,36,
        63,55,47,39,31,23,15, 7,62,54,46,38,30,22,
        14, 6,61,53,45,37,29,21,13, 5,28,20,12, 4,
};

static struct ordering KeyTr2 = {
        14,17,11,24, 1, 5, 3,28,15, 6,21,10,
        23,19,12, 4,26, 8,16, 7,27,20,13, 2,
        41,52,31,37,47,55,30,40,51,45,33,48,
        44,49,39,56,34,53,46,42,50,36,29,32,
};

static struct ordering etr = {
        32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9,
         8, 9,10,11,12,13,12,13,14,15,16,17,
        16,17,18,19,20,21,20,21,22,23,24,25,
        24,25,26,27,28,29,28,29,30,31,32, 1,
};

static struct ordering ptr = {
        16, 7,20,21,29,12,28,17, 1,15,23,26, 5,18,31,10,
         2, 8,24,14,32,27, 3, 9,19,13,30, 6,22,11, 4,25,
};

static unsigned char s_boxes[8][64] = {