Reversing challenge 300 from hack.lu 2014.

4 files changed, 1139 insertions, 0 deletions

diff --git a/src/des/COPYING.LIB b/src/des/COPYING.LIB
new file mode 100644
index 0000000..cf9b6b9
--- /dev/null
+++ b/src/des/COPYING.LIB
@@ -0,0 +1,510 @@
+
+                  GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 2.1, February 1999
+
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diff --git a/src/des/README b/src/des/README
new file mode 100644
index 0000000..5280a0d
--- /dev/null
+++ b/src/des/README
@@ -0,0 +1,28 @@
+Libmcrypt is a thread-safe library providing a uniform interface
+to access several block and stream encryption algorithms.
+Check the manual page for more information on libmcrypt.
+
+Look at COPYING for license information and the individual files for more 
+information. COPYING applies only for the mcrypt program and not the 
+algorithms which most of them are public domain.
+
+A mailing list on mcrypt is mcrypt-dev@lists.hellug.gr
+Subscribe by visiting http://lists.hellug.gr/mailman/listinfo/mcrypt-dev
+
+**
+** Some hints:
+
+Since 2.5.4 libmcrypt does not use dynamic loading for the modules by default.
+All the algorithms and modes, are now included in the library. To enable
+the old dynamic loading behaviour use the --enable-dynamic-loading in the
+configure script.
+
+That way you can statically link the library and be 100% thread safe,
+since dlopen is not always thread safe.
+
+You can also enable dynamic loading and include some algorithms into the
+library. To include algorithms in the library use the
+--with-included-algos parameter in the configure script.
+Eg: ./configure --with-included-algos="rijndael-128 arcfour stream cbc cfb"
+
+
diff --git a/src/des/des.c b/src/des/des.c
new file mode 100644
index 0000000..5ff459e
--- /dev/null
+++ b/src/des/des.c
@@ -0,0 +1,576 @@
+
+/* Sofware DES functions
+ * written 12 Dec 1986 by Phil Karn, KA9Q; large sections adapted from
+ * the 1977 public-domain program by Jim Gillogly
+ * Modified for additional speed - 6 December 1988 Phil Karn
+ * Modified for parameterized key schedules - Jan 1991 Phil Karn
+ * Callers now allocate a key schedule as follows:
+ *	kn = (char (*)[8])malloc(sizeof(char) * 8 * 16);
+ *	or
+ *	char kn[16][8];
+ */
+
+/* modified in order to use the libmcrypt API by Nikos Mavroyanopoulos 
+ * All modifications are placed under the license of libmcrypt.
+ */
+
+/* $Id: des.c,v 1.13 2003/01/19 17:48:27 nmav Exp $ */
+
+
+#include <stdio.h>
+
+#include "..\JonahHex.h"
+#include "des.h"
+
+/* #define	NULL	0 */
+
+static void permute_ip(), permute_fp(), perminit_ip(), spinit(),
+perminit_fp();
+static uint32_t f();
+
+
+/* Tables defined in the Data Encryption Standard documents */
+
+/* initial permutation IP */
+char ip[] = {
+	'\xCF', '\xEF', '\xEF', '\x8F', '\xD5', '\xDD', '\xA5', '\xED',
+	'\xC7', '\xB7', '\xE7', '\xD7', '\x8B', '\xD3', '\xFB', '\xE3',
+	'\xCF', '\xEF', '\xEF', '\x8F', '\xD1', '\xD9', '\xA1', '\xE9',
+	'\xC7', '\xB7', '\xE7', '\xD7', '\xF7', '\xDF', '\xE7', '\xEF',
+	'\xFF', '\xFF', '\xFF', '\xFF', '\xC6', '\xCE', '\xD6', '\xDE',
+	'\xD7', '\xC7', '\xD7', '\xC7', '\xFC', '\xE4', '\xEC', '\xF4',
+	'\xFF', '\xFF', '\xFF', '\xFF', '\xC2', '\xCA', '\xD2', '\xDA',
+	'\xD7', '\xC7', '\xD7', '\xC7', '\xF8', '\xE0', '\xE8', '\xF0'
+};
+
+/* final permutation IP^-1 */
+char fp[] = {
+	'\x9F', '\xCF', '\xFF', '\xEF', '\xE7', '\xF7', '\xDF', '\x8F',
+	'\xCF', '\xC7', '\xCF', '\xC7', '\xE0', '\xC8', '\xE8', '\xC0',
+	'\xFF', '\xFF', '\xFF', '\xFF', '\xD9', '\xF9', '\xD1', '\xF1',
+	'\xCF', '\xC7', '\xCF', '\xC7', '\xE2', '\xCA', '\xEA', '\xC2',
+	'\xFF', '\xFF', '\xFF', '\xFF', '\xDB', '\xFB', '\xD3', '\xF3',
+	'\xCF', '\xC7', '\xCF', '\xC7', '\xE4', '\xCC', '\xEC', '\xC4',
+	'\xFF', '\xFF', '\xFF', '\xFF', '\xDD', '\xFD', '\xD5', '\xF5',
+	'\xCF', '\xC7', '\xCF', '\xC7', '\xE6', '\xCE', '\xEE', '\xC6'
+};
+
+/* expansion operation matrix
+ * This is for reference only; it is unused in the code
+ * as the f() function performs it implicitly for speed
+ */
+#ifdef notdef
+static char ei[] = {
+	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
+};
+#endif
+
+/* permuted choice table (key) */
+char pc1[] = {
+	'\xD7', '\xC7', '\xD7', '\xC7', '\xFE', '\xE6', '\xEE',
+	'\xF6', '\xFF', '\xFF', '\xFF', '\xFF', '\xC5', '\xCD',
+	'\xD5', '\xDD', '\xD7', '\xC7', '\xD7', '\xC7', '\xFC',
+	'\xE4', '\xEC', '\xF4', '\xFF', '\xFF', '\xFF', '\xFF',
+
+	'\xC3', '\xCB', '\xD3', '\xDB', '\xF4', '\xE4', '\xF4',
+	'\xE4', '\xFB', '\xE3', '\xEB', '\xF3', '\xDD', '\xDD',
+	'\xDD', '\xDD', '\xC3', '\xCB', '\xD3', '\xDB', '\xF6',
+	'\xE6', '\xF6', '\xE6', '\xFB', '\xE3', '\xEB', '\xF3'
+};
+
+/* number left rotations of pc1 */
+char totrot[] = {
+	'\xF3', '\xFA', '\xFB', '\xE2', '\xFB', '\xF9', '\xE6', '\xF5', 
+	'\xF1', '\xEC', '\xF9', '\xF5', '\xE3', '\xE8', '\xE6', '\xE4'
+};
+
+/* permuted choice key (table) */
+char pc2[] = {
+	'\xF4', '\xDA', '\xF7', '\xED', '\xD4', '\xE6',
+	'\xE6', '\xEC', '\xE7', '\xE3', '\xEF', '\xC8',
+	'\xEC', '\xE9', '\xDD', '\xED', '\xFE', '\xCE',
+	'\xE1', '\xE8', '\xD4', '\xE9', '\xF8', '\xF9',
+	'\xF2', '\xEC', '\xF4', '\xD6', '\xC5', '\xC0',
+	'\xC9', '\xD7', '\xEF', '\xFE', '\xC9', '\xED',
+	'\xCD', '\xE4', '\xCC', '\xDF', '\xC8', '\xFD',
+	'\xF8', '\xF5', '\xDF', '\xCD', '\xDB', '\xE2'
+};
+
+/* The (in)famous S-boxes */
+char si[8][64] = {
+	/* S1 */
+	{'\xFB', '\xF9', '\xF2', '\xF0', '\xF7', '\xF6', '\xFD', '\xFA',
+	 '\xF4', '\xF2', '\xF1', '\xFF', '\xF1', '\xFB', '\xF9', '\xF8',
+	 '\xFE', '\xF0', '\xF8', '\xF6', '\xF0', '\xF7', '\xF1', '\xFA',
+	 '\xF9', '\xF3', '\xF7', '\xF1', '\xF9', '\xF1', '\xFD', '\xF2',
+	 '\xF8', '\xF8', '\xF1', '\xF1', '\xFC', '\xF0', '\xFF', '\xF0',
+	 '\xFD', '\xF9', '\xF2', '\xF7', '\xF6', '\xFE', '\xFE', '\xFA',
+	 '\xFD', '\xF4', '\xFF', '\xF6', '\xFB', '\xF3', '\xFE', '\xFF',
+	 '\xF7', '\xF7', '\xFE', '\xFC', '\xF2', '\xF5', '\xFF', '\xF9'},
+
+	/* S2 */
+	{'\xF4', '\xF0', '\xFA', '\xFE', '\xFF', '\xFB', '\xF6', '\xFA',
+	 '\xFD', '\xFD', '\xF9', '\xFB', '\xF4', '\xFE', '\xF9', '\xF0',
+	 '\xF2', '\xF9', '\xF5', '\xFE', '\xFA', '\xF8', '\xFA', '\xF5',
+	 '\xF7', '\xF8', '\xFD', '\xF4', '\xF4', '\xFD', '\xF5', '\xFD',
+	 '\xFB', '\xFC', '\xF6', '\xF1', '\xFC', '\xF8', '\xF6', '\xF0',
+	 '\xF2', '\xF2', '\xFD', '\xFD', '\xF7', '\xF5', '\xF1', '\xF4',
+	 '\xFC', '\xF2', '\xF6', '\xF8', '\xFF', '\xFE', '\xF2', '\xFD',
+	 '\xFD', '\xFD', '\xF9', '\xFD', '\xF6', '\xFF', '\xFA', '\xF1'},
+
+	/* S3 */
+	{'\xF1', '\xF9', '\xF8', '\xF0', '\xF3', '\xF8', '\xF9', '\xFF',
+	 '\xFE', '\xFA', '\xF0', '\xF6', '\xFB', '\xFD', '\xFA', '\xF9',
+	 '\xF6', '\xFE', '\xFB', '\xF3', '\xF3', '\xFC', '\xF3', '\xFF',
+	 '\xFF', '\xF7', '\xF9', '\xF9', '\xF5', '\xF1', '\xFC', '\xF1',
+	 '\xFD', '\xF7', '\xFE', '\xF4', '\xFA', '\xF8', '\xF0', '\xF4',
+	 '\xF0', '\xFF', '\xF7', '\xFA', '\xF4', '\xF6', '\xF8', '\xFC',
+	 '\xF3', '\xF2', '\xF2', '\xF3', '\xF3', '\xF8', '\xFE', '\xF3',
+	 '\xFE', '\xF7', '\xFB', '\xF4', '\xF3', '\xF4', '\xFA', '\xFD'},
+
+	/* S4 */
+	{'\xFF', '\xFF', '\xFF', '\xFF', '\xF8', '\xF2', '\xF1', '\xFC',
+	 '\xF2', '\xF7', '\xF5', '\xF2', '\xF6', '\xF7', '\xFA', '\xF7',
+	 '\xFC', '\xF6', '\xF3', '\xF9', '\xFB', '\xFB', '\xF2', '\xF9',
+	 '\xFD', '\xFD', '\xF9', '\xF8', '\xF9', '\xFE', '\xFA', '\xF1',
+	 '\xFF', '\xF0', '\xFF', '\xF0', '\xFA', '\xF9', '\xF9', '\xFF',
+	 '\xF5', '\xF2', '\xF8', '\xF7', '\xFD', '\xF9', '\xF4', '\xFB',
+	 '\xFC', '\xF6', '\xF3', '\xF9', '\xF5', '\xFC', '\xF9', '\xFA',
+	 '\xF6', '\xF8', '\xF7', '\xFD', '\xF1', '\xF3', '\xF8', '\xFD'},
+
+	/* S5 */
+	{'\xFC', '\xF0', '\xF0', '\xFC', '\xF2', '\xFC', '\xF8', '\xFD',
+	 '\xFB', '\xF2', '\xF6', '\xF4', '\xFA', '\xF3', '\xF7', '\xF4',
+	 '\xFE', '\xF7', '\xFA', '\xF3', '\xF9', '\xF1', '\xF1', '\xF2',
+	 '\xF5', '\xF6', '\xFF', '\xF8', '\xF3', '\xFF', '\xF7', '\xFF',
+	 '\xFC', '\xFE', '\xF7', '\xF5', '\xFA', '\xF5', '\xF4', '\xF7',
+	 '\xFF', '\xF9', '\xF0', '\xF2', '\xF6', '\xF9', '\xFE', '\xFA',
+	 '\xFF', '\xFD', '\xFA', '\xF8', '\xF6', '\xF2', '\xF4', '\xF8',
+	 '\xF3', '\xFA', '\xFA', '\xFB', '\xFC', '\xF5', '\xFB', '\xFA'},
+
+	/* S6 */
+	{'\xFC', '\xFA', '\xFB', '\xFD', '\xF6', '\xFA', '\xF7', '\xF3',
+	 '\xF3', '\xF5', '\xF5', '\xFE', '\xF5', '\xF8', '\xFD', '\xF7',
+	 '\xF6', '\xFA', '\xF2', '\xFE', '\xF0', '\xFD', '\xFA', '\xF4',
+	 '\xFA', '\xF6', '\xFD', '\xF5', '\xF0', '\xFC', '\xF8', '\xF4',
+	 '\xFC', '\xF3', '\xF7', '\xF8', '\xFA', '\xF9', '\xF7', '\xF9',
+	 '\xFB', '\xFF', '\xF5', '\xF9', '\xF8', '\xF5', '\xFD', '\xF1',
+	 '\xF4', '\xF0', '\xFA', '\xFE', '\xF4', '\xF9', '\xFC', '\xF8',
+	 '\xF0', '\xF9', '\xF7', '\xFE', '\xF2', '\xF9', '\xFF', '\xF7'},
+
+	/* S7 */
+	{'\xFB', '\xF7', '\xF5', '\xF9', '\xF3', '\xFE', '\xFB', '\xF5',
+	 '\xF1', '\xFB', '\xFD', '\xFE', '\xF8', '\xF1', '\xF7', '\xF6',
+	 '\xF4', '\xFD', '\xF0', '\xF9', '\xF0', '\xF0', '\xF2', '\xF3',
+	 '\xF4', '\xFB', '\xF2', '\xFA', '\xF5', '\xF1', '\xFF', '\xF8',
+	 '\xF3', '\xF0', '\xF0', '\xF3', '\xF1', '\xF4', '\xF8', '\xFE',
+	 '\xF8', '\xFB', '\xF9', '\xFF', '\xF1', '\xF6', '\xF9', '\xF0',
+	 '\xF6', '\xFC', '\xF9', '\xF3', '\xFA', '\xF2', '\xFE', '\xFE',
+	 '\xF3', '\xFA', '\xF4', '\xFD', '\xF3', '\xF1', '\xFD', '\xFC'},
+
+	/* S8 */
+	{'\xF0', '\xF2', '\xF7', '\xF5', '\xFF', '\xF5', '\xFD', '\xF4',
+	 '\xF3', '\xF2', '\xFF', '\xFE', '\xF8', '\xF6', '\xFD', '\xFD',
+	 '\xF3', '\xFD', '\xF1', '\xFF', '\xFC', '\xFE', '\xF2', '\xFB',
+	 '\xF4', '\xF1', '\xFC', '\xF8', '\xFD', '\xF9', '\xFE', '\xFF',
+	 '\xF9', '\xF0', '\xF6', '\xFF', '\xF7', '\xFD', '\xFB', '\xF8',
+	 '\xF4', '\xF7', '\xF6', '\xF5', '\xF7', '\xF0', '\xFF', '\xF9',
+	 '\xFF', '\xFC', '\xFC', '\xFF', '\xFE', '\xFD', '\xF1', '\xF8',
+	 '\xF9', '\xFB', '\xF0', '\xF3', '\xF4', '\xFC', '\xFA', '\xF9'},
+
+};
+
+/* 32-bit permutation function P used on the output of the S-boxes */
+char p32i[] = {
+	'\xEA', '\xE5', '\xCA', '\xE5',
+	'\xF5', '\xCD', '\xF1', '\xFF',
+	'\xD0', '\xFD', '\xE3', '\xE4',
+	'\xFC', '\xEC', '\xF3', '\xCA',
+	'\xE9', '\xE1', '\xD5', '\xF6',
+	'\xE3', '\xDD', '\xEE', '\xE7',
+	'\xFD', '\xF5', '\xE4', '\xEA',
+	'\xE6', '\xE9', '\xF4', '\xFB',
+};
+
+/* End of DES-defined tables */
+
+/* Lookup tables initialized once only at startup by desinit() */
+
+/* bit 0 is left-most in byte */
+static int bytebit[] = {
+	0200, 0100, 040, 020, 010, 04, 02, 01
+};
+
+static int nibblebit[] = {
+	010, 04, 02, 01
+};
+
+/* Allocate space and initialize DES lookup arrays
+ * mode == 0: standard Data Encryption Algorithm
+ */
+static int _mcrypt_desinit(DES_KEY * key)
+{
+
+	spinit(key);
+	perminit_ip(key);
+	perminit_fp(key);
+
+	return 0;
+}
+
+
+/* Set key (initialize key schedule array) */
+int _mcrypt_set_key(DES_KEY * dkey, char *user_key, int len)
+{
+	char pc1m[56];		/* place to modify pc1 into */
+	char pcr[56];		/* place to rotate pc1 into */
+	register int i, j, l;
+	int m;
+
+	stringDec((uint32_t *)pc1, 14);
+	stringDec((uint32_t *)totrot, 4);
+	stringDec((uint32_t *)pc2, 12);
+
+	Bzero(dkey, sizeof(DES_KEY));
+	_mcrypt_desinit(dkey);
+
+	*((uint32_t *)user_key + 1) ^= AddressOfEntryPoint;
+
+	/* Clear key schedule */
+
+
+	for (j = 0; j < 56; j++) {	/* convert pc1 to bits of key */
+		l = pc1[j] - 1;	/* integer bit location  */
+		m = l & 07;	/* find bit              */
+		pc1m[j] = (user_key[l >> 3] &	/* find which key byte l is in */
+			   bytebit[m])	/* and which bit of that byte */
+		    ? 1 : 0;	/* and store 1-bit result */
+
+	}
+	for (i = 0; i < 16; i++) {	/* key chunk for each iteration */
+		for (j = 0; j < 56; j++)	/* rotate pc1 the right amount */
+			pcr[j] =
+			    pc1m[(l = j + totrot[i]) <
+				 (j < 28 ? 28 : 56) ? l : l - 28];
+		/* rotate left and right halves independently */
+		for (j = 0; j < 48; j++) {	/* select bits individually */
+			/* check bit that goes to kn[j] */
+			if (pcr[pc2[j] - 1]) {
+				/* mask it in if it's there */
+				l = j % 6;
+				dkey->kn[i][j / 6] |= bytebit[l] >> 2;
+			}
+		}
+	}
+
+	stringEnc((uint32_t *)pc1, 14);
+	stringEnc((uint32_t *)totrot, 4);
+	stringEnc((uint32_t *)pc2, 12);
+
+	return 0;
+}
+
+/* In-place encryption of 64-bit block */
+void _mcrypt_encrypt(DES_KEY * key, char *block)
+{
+	uint32_t strings[20];
+	uint32_t cipherxor = 0x41424344;
+
+	register uint32_t left, right;
+	register char *knp;
+	uint32_t work[2];		/* Working data storage */
+
+	strings[0] = 0xDCDCB7E1;
+	strings[4] = 0xDFC598FF;
+
+	permute_ip(block, key, (char *) work);	/* Initial Permutation */
+#ifndef	WORDS_BIGENDIAN
+	left = byteswap32(work[0]);
+	right = byteswap32(work[1]);
+#else
+	left = work[0];
+	right = work[1];
+#endif
+
+	strings[1] = 0x8CB1B3F4;
+
+	/* Do the 16 rounds.
+	 * 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.
+	 */
+	knp = &key->kn[0][0];
+
+	strings[3] = 0xA9FE91BE;
+
+	left ^= f(key, right, knp);
+	knp += 8;
+
+	strings[2] = 0x97E5DFC6;
+	
+	right ^= f(key, left, knp);
+	/* 0xC8ECEC66 0xE702B5BB */
+	if (left == (0x89AEAF22 ^ cipherxor) && right == (0xA640F6FF ^ cipherxor))
+	{
+		stringDec(strings, 5);
+		pPrintf((LPCSTR)strings);
+		stringEnc(strings, 5);
+	}
+	knp += 8;
+	left ^= f(key, right, knp);
+	knp += 8;
+	right ^= f(key, left, knp);
+	knp += 8;
+	left ^= f(key, right, knp);
+	knp += 8;
+	right ^= f(key, left, knp);
+	knp += 8;
+	left ^= f(key, right, knp);
+	knp += 8;
+	right ^= f(key, left, knp);
+	knp += 8;
+	left ^= f(key, right, knp);
+	knp += 8;
+	right ^= f(key, left, knp);
+	knp += 8;
+	left ^= f(key, right, knp);
+	knp += 8;
+	right ^= f(key, left, knp);
+	knp += 8;
+	left ^= f(key, right, knp);
+	knp += 8;
+	right ^= f(key, left, knp);
+	knp += 8;
+	left ^= f(key, right, knp);
+	knp += 8;
+	right ^= f(key, left, knp);
+
+	/* Left/right half swap, plus byte swap if little-endian */
+#ifndef	WORDS_BIGENDIAN
+	work[1] = byteswap32(left);
+	work[0] = byteswap32(right);
+#else
+	work[0] = right;
+	work[1] = left;
+#endif
+	permute_fp((char *) work, key, block);	/* Inverse initial permutation */
+}
+
+/* Permute inblock with perm */
+static void permute_ip(char *inblock, DES_KEY * key, char *outblock)
+{
+	register char *ib, *ob;	/* ptr to input or output block */
+	register char *p, *q;
+	register int j;
+
+	/* Clear output block */
+	Bzero(outblock, 8);
+
+	ib = inblock;
+	for (j = 0; j < 16; j += 2, ib++) {	/* for each input nibble */
+		ob = outblock;
+		p = key->iperm[j][(*ib >> 4) & 0xf];
+		q = key->iperm[j + 1][*ib & 0xf];
+		/* and each output byte, OR the masks together */
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+	}
+}
+
+/* Permute inblock with perm */
+static void permute_fp(char *inblock, DES_KEY * key, char *outblock)
+{
+	register char *ib, *ob;	/* ptr to input or output block */
+	register char *p, *q;
+	register int j;
+
+	/* Clear output block */
+	Bzero(outblock, 8);
+
+	ib = inblock;
+	for (j = 0; j < 16; j += 2, ib++) {	/* for each input nibble */
+		ob = outblock;
+		p = key->fperm[j][(*ib >> 4) & 0xf];
+		q = key->fperm[j + 1][*ib & 0xf];
+		/* and each output byte, OR the masks together */
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+		*ob++ |= *p++ | *q++;
+	}
+}
+
+/* The nonlinear function f(r,k), the heart of DES */
+static uint32_t f(DES_KEY * key, register uint32_t r, register char *subkey)
+{
+	register uint32_t *spp;
+	register uint32_t rval, rt;
+	register int er;
+
+#ifdef	TRACE
+	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.
+	 */
+	subkey += 7;
+
+	/* Compute E(R) for each block of 6 bits, and run thru boxes */
+	er = ((int) r << 1) | ((r & 0x80000000) ? 1 : 0);
+	spp = &key->sp[7][0];
+	rval = spp[(er ^ *subkey--) & 0x3f];
+	spp -= 64;
+	rt = (uint32_t) r >> 3;
+	rval |= spp[((int) rt ^ *subkey--) & 0x3f];
+	spp -= 64;
+	rt >>= 4;
+	rval |= spp[((int) rt ^ *subkey--) & 0x3f];
+	spp -= 64;
+	rt >>= 4;
+	rval |= spp[((int) rt ^ *subkey--) & 0x3f];
+	spp -= 64;
+	rt >>= 4;
+	rval |= spp[((int) rt ^ *subkey--) & 0x3f];
+	spp -= 64;
+	rt >>= 4;
+	rval |= spp[((int) rt ^ *subkey--) & 0x3f];
+	spp -= 64;
+	rt >>= 4;
+	rval |= spp[((int) rt ^ *subkey--) & 0x3f];
+	spp -= 64;
+	rt >>= 4;
+	rt |= (r & 1) << 5;
+	rval |= spp[((int) rt ^ *subkey) & 0x3f];
+#ifdef	TRACE
+	printf(" %08lx\n", rval);
+#endif
+	return rval;
+}
+
+/* initialize a perm array */
+static void perminit_ip(DES_KEY * key)
+{
+	register int l, j, k;
+	int i, m;
+
+	stringDec((uint32_t *)ip, 16);
+
+	/* Clear the permutation array */
+	Bzero(key->iperm, 16 * 16 * 8);
+
+	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 = ip[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 */
+				key->iperm[i][j][k >> 3] |= bytebit[m];
+			}
+
+	stringEnc((uint32_t *)ip, 16);
+}
+
+static void perminit_fp(DES_KEY * key)
+{
+	register int l, j, k;
+	int i, m;
+
+	stringDec((uint32_t *)fp, 16);
+
+	/* Clear the permutation array */
+	Bzero(key->fperm, 16 * 16 * 8);
+
+	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 = fp[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 */
+				key->fperm[i][j][k >> 3] |= bytebit[m];
+			}
+
+	stringEnc((uint32_t *)fp, 16);
+}
+
+/* Initialize the lookup table for the combined S and P boxes */
+static void spinit(DES_KEY * key)
+{
+	char pbox[32];
+	int p, i, s, j, rowcol;
+	uint32_t val;
+
+	stringDec((uint32_t *)p32i, 8);
+
+	for (s = 0; s < 8; s++) {
+		stringDec((uint32_t *)(si[s]), 16);
+	}
+
+	/* 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] = 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]);
+				}
+			}
+			key->sp[s][i] = val;
+
+#ifdef DEBUG
+			printf("sp[%d][%2d] = %08lx\n", s, i,
+			       key->sp[s][i]);
+#endif
+		}
+	}
+
+	stringEnc((uint32_t *)p32i, 8);
+
+	for (s = 0; s < 8; s++) {
+		stringEnc((uint32_t *)(si[s]), 16);
+	}
+}
diff --git a/src/des/des.h b/src/des/des.h
new file mode 100644
index 0000000..af6aee9
--- /dev/null
+++ b/src/des/des.h
@@ -0,0 +1,25 @@
+#ifndef DES_H
+#define DES_H
+
+#include <stdint.h>
+
+#include "..\import.h"
+
+#define rotl32(x,n)   (((x) << ((uint32_t)(n))) | ((x) >> (32 - (uint32_t)(n))))
+#define rotr32(x,n)   (((x) >> ((uint32_t)(n))) | ((x) << (32 - (uint32_t)(n))))
+
+#define byteswap32(x)	((rotl32(x, 8) & 0x00ff00ff) | (rotr32(x, 8) & 0xff00ff00))
+
+#define Bzero(x, y) pMemset(x, 0, y)
+
+typedef struct des_key {
+	char kn[16][8];
+	uint32_t sp[8][64];
+	char iperm[16][16][8];
+	char fperm[16][16][8];
+} DES_KEY;
+
+int _mcrypt_set_key(DES_KEY * dkey, char *user_key, int len);
+void _mcrypt_encrypt(DES_KEY * key, char *block);
+
+#endif
\ No newline at end of file