--- /dev/null
+/*
+ +----------------------------------------------------------------------+
+ | PHP Version 4 |
+ +----------------------------------------------------------------------+
+ | Copyright (c) 1997-2002 The PHP Group |
+ +----------------------------------------------------------------------+
+ | This source file is subject to version 2.02 of the PHP license, |
+ | that is bundled with this package in the file LICENSE, and is |
+ | available at through the world-wide-web at |
+ | http://www.php.net/license/2_02.txt. |
+ | If you did not receive a copy of the PHP license and are unable to |
+ | obtain it through the world-wide-web, please send a note to |
+ | license@php.net so we can mail you a copy immediately. |
+ +----------------------------------------------------------------------+
+ | Author: |
+ +----------------------------------------------------------------------+
+ */
+
+/* $Id$ */
+
+/* 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 <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[*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[*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[*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;
+}
+
+
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