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encrypt.c
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/*
* Copyright (C) 1996-2023 The Squid Software Foundation and contributors
*
* Squid software is distributed under GPLv2+ license and includes
* contributions from numerous individuals and organizations.
* Please see the COPYING and CONTRIBUTORS files for details.
*/
/* encrypt.c - providing 56 bit DES encryption
* Copyright (C) 1991 Jochen Obalek
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "squid.h"
#include <time.h>
#include <string.h>
#include <stdlib.h>
#define BS 64
#define BS2 32
#define KS 48
#define KS2 24
#define IS 56
#define IS2 28
static char schluessel[16][KS];
static char PC1[] = {
56, 48, 40, 32, 24, 16, 8, 0,
57, 49, 41, 33, 25, 17, 9, 1,
58, 50, 42, 34, 26, 18, 10, 2,
59, 51, 43, 35,
62, 54, 46, 38, 30, 22, 14, 6,
61, 53, 45, 37, 29, 21, 13, 5,
60, 52, 44, 36, 28, 20, 12, 4,
27, 19, 11, 3
};
static char PC2[] = {
13, 16, 10, 23, 0, 4, 2, 27,
14, 5, 20, 9, 22, 18, 11, 3,
25, 7, 15, 6, 26, 19, 12, 1,
40, 51, 30, 36, 46, 54, 29, 39,
50, 44, 32, 47, 43, 48, 38, 55,
33, 52, 45, 41, 49, 35, 28, 31
};
static char IP[] = {
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,
56, 48, 40, 32, 24, 16, 8, 0,
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6
};
static char EP[] = {
7, 39, 15, 47, 23, 55, 31, 63,
6, 38, 14, 46, 22, 54, 30, 62,
5, 37, 13, 45, 21, 53, 29, 61,
4, 36, 12, 44, 20, 52, 28, 60,
3, 35, 11, 43, 19, 51, 27, 59,
2, 34, 10, 42, 18, 50, 26, 58,
1, 33, 9, 41, 17, 49, 25, 57,
0, 32, 8, 40, 16, 48, 24, 56
};
static char E0[] = {
31, 0, 1, 2, 3, 4, 3, 4,
5, 6, 7, 8, 7, 8, 9, 10,
11, 12, 11, 12, 13, 14, 15, 16,
15, 16, 17, 18, 19, 20, 19, 20,
21, 22, 23, 24, 23, 24, 25, 26,
27, 28, 27, 28, 29, 30, 31, 0
};
static char E[KS];
static char PERM[] = {
15, 6, 19, 20, 28, 11, 27, 16,
0, 14, 22, 25, 4, 17, 30, 9,
1, 7, 23, 13, 31, 26, 2, 8,
18, 12, 29, 5, 21, 10, 3, 24
};
static char S_BOX[][64] = {
{
14, 0, 4, 15, 13, 7, 1, 4, 2, 14, 15, 2, 11, 13, 8, 1,
3, 10, 10, 6, 6, 12, 12, 11, 5, 9, 9, 5, 0, 3, 7, 8,
4, 15, 1, 12, 14, 8, 8, 2, 13, 4, 6, 9, 2, 1, 11, 7,
15, 5, 12, 11, 9, 3, 7, 14, 3, 10, 10, 0, 5, 6, 0, 13
},
{
15, 3, 1, 13, 8, 4, 14, 7, 6, 15, 11, 2, 3, 8, 4, 14,
9, 12, 7, 0, 2, 1, 13, 10, 12, 6, 0, 9, 5, 11, 10, 5,
0, 13, 14, 8, 7, 10, 11, 1, 10, 3, 4, 15, 13, 4, 1, 2,
5, 11, 8, 6, 12, 7, 6, 12, 9, 0, 3, 5, 2, 14, 15, 9
},
{
10, 13, 0, 7, 9, 0, 14, 9, 6, 3, 3, 4, 15, 6, 5, 10,
1, 2, 13, 8, 12, 5, 7, 14, 11, 12, 4, 11, 2, 15, 8, 1,
13, 1, 6, 10, 4, 13, 9, 0, 8, 6, 15, 9, 3, 8, 0, 7,
11, 4, 1, 15, 2, 14, 12, 3, 5, 11, 10, 5, 14, 2, 7, 12
},
{
7, 13, 13, 8, 14, 11, 3, 5, 0, 6, 6, 15, 9, 0, 10, 3,
1, 4, 2, 7, 8, 2, 5, 12, 11, 1, 12, 10, 4, 14, 15, 9,
10, 3, 6, 15, 9, 0, 0, 6, 12, 10, 11, 1, 7, 13, 13, 8,
15, 9, 1, 4, 3, 5, 14, 11, 5, 12, 2, 7, 8, 2, 4, 14
},
{
2, 14, 12, 11, 4, 2, 1, 12, 7, 4, 10, 7, 11, 13, 6, 1,
8, 5, 5, 0, 3, 15, 15, 10, 13, 3, 0, 9, 14, 8, 9, 6,
4, 11, 2, 8, 1, 12, 11, 7, 10, 1, 13, 14, 7, 2, 8, 13,
15, 6, 9, 15, 12, 0, 5, 9, 6, 10, 3, 4, 0, 5, 14, 3
},
{
12, 10, 1, 15, 10, 4, 15, 2, 9, 7, 2, 12, 6, 9, 8, 5,
0, 6, 13, 1, 3, 13, 4, 14, 14, 0, 7, 11, 5, 3, 11, 8,
9, 4, 14, 3, 15, 2, 5, 12, 2, 9, 8, 5, 12, 15, 3, 10,
7, 11, 0, 14, 4, 1, 10, 7, 1, 6, 13, 0, 11, 8, 6, 13
},
{
4, 13, 11, 0, 2, 11, 14, 7, 15, 4, 0, 9, 8, 1, 13, 10,
3, 14, 12, 3, 9, 5, 7, 12, 5, 2, 10, 15, 6, 8, 1, 6,
1, 6, 4, 11, 11, 13, 13, 8, 12, 1, 3, 4, 7, 10, 14, 7,
10, 9, 15, 5, 6, 0, 8, 15, 0, 14, 5, 2, 9, 3, 2, 12
},
{
13, 1, 2, 15, 8, 13, 4, 8, 6, 10, 15, 3, 11, 7, 1, 4,
10, 12, 9, 5, 3, 6, 14, 11, 5, 0, 0, 14, 12, 9, 7, 2,
7, 2, 11, 1, 4, 14, 1, 7, 9, 4, 12, 10, 14, 8, 2, 13,
0, 15, 6, 12, 10, 9, 13, 0, 15, 3, 3, 5, 5, 6, 8, 11
}
};
static void
perm(a, e, pc, n)
register char *a, *e;
register char *pc;
int n;
{
for (; n--; pc++, a++)
*a = e[(int)*pc];
}
static void
crypt_main(nachr_l, nachr_r, schl)
register char *nachr_l, *nachr_r;
register char *schl;
{
char tmp[KS];
register int sbval;
register char *tp = tmp;
register char *e = E;
register int i, j;
for (i = 0; i < 8; i++) {
for (j = 0, sbval = 0; j < 6; j++)
sbval = (sbval << 1) | (nachr_r[(int)*e++] ^ *schl++);
sbval = S_BOX[i][sbval];
for (tp += 4, j = 4; j--; sbval >>= 1)
*--tp = sbval & 1;
tp += 4;
}
e = PERM;
for (i = 0; i < BS2; i++)
*nachr_l++ ^= tmp[(int)*e++];
}
void
encrypt(char *nachr, int decr)
{
char (*schl)[KS] = decr ? schluessel + 15 : schluessel;
char tmp[BS];
int i;
perm(tmp, nachr, IP, BS);
for (i = 8; i--;) {
crypt_main(tmp, tmp + BS2, *schl);
if (decr)
schl--;
else
schl++;
crypt_main(tmp + BS2, tmp, *schl);
if (decr)
schl--;
else
schl++;
}
perm(nachr, tmp, EP, BS);
}
void
setkey(char *schl)
{
char tmp1[IS];
register unsigned int ls = 0x7efc;
register int i, j, k;
register int shval = 0;
register char *akt_schl;
memcpy(E, E0, KS);
perm(tmp1, schl, PC1, IS);
for (i = 0; i < 16; i++) {
shval += 1 + (ls & 1);
akt_schl = schluessel[i];
for (j = 0; j < KS; j++) {
if ((k = PC2[j]) >= IS2) {
if ((k += shval) >= IS)
k = (k - IS2) % IS2 + IS2;
} else if ((k += shval) >= IS2)
k %= IS2;
*akt_schl++ = tmp1[k];
}
ls >>= 1;
}
}
char *
crypt(const char *wort, const char *salt)
{
static char retkey[14];
char key[BS + 2];
char *k;
int tmp, keybyte;
int i, j;
memset(key, 0, BS + 2);
for (k = key, i = 0; i < BS; i++) {
if (!(keybyte = *wort++))
break;
k += 7;
for (j = 0; j < 7; j++, i++) {
*--k = keybyte & 1;
keybyte >>= 1;
}
k += 8;
}
setkey(key);
memset(key, 0, BS + 2);
for (k = E, i = 0; i < 2; i++) {
retkey[i] = keybyte = *salt++;
if (keybyte > 'Z')
keybyte -= 'a' - 'Z' - 1;
if (keybyte > '9')
keybyte -= 'A' - '9' - 1;
keybyte -= '.';
for (j = 0; j < 6; j++, keybyte >>= 1, k++) {
if (!(keybyte & 1))
continue;
tmp = *k;
*k = k[24];
k[24] = tmp;
}
}
for (i = 0; i < 25; i++)
encrypt(key, 0);
for (k = key, i = 0; i < 11; i++) {
for (j = keybyte = 0; j < 6; j++) {
keybyte <<= 1;
keybyte |= *k++;
}
keybyte += '.';
if (keybyte > '9')
keybyte += 'A' - '9' - 1;
if (keybyte > 'Z')
keybyte += 'a' - 'Z' - 1;
retkey[i + 2] = keybyte;
}
retkey[i + 2] = 0;
if (!retkey[1])
retkey[1] = *retkey;
return retkey;
}