--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/des.c	Fri Oct 21 12:28:18 2005 +0000
@@ -0,0 +1,683 @@
+/* des.c --- DES and Triple-DES encryption/decryption Algorithm
+ * Copyright (C) 1998, 1999, 2001, 2002, 2003, 2004, 2005
+ *    Free Software Foundation, Inc.
+ *
+ * This file 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 file 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 file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ */
+
+/* Adapted for gnulib by Simon Josefsson, based on Libgcrypt. */
+
+/*
+ * For a description of triple encryption, see:
+ *   Bruce Schneier: Applied Cryptography. Second Edition.
+ *   John Wiley & Sons, 1996. ISBN 0-471-12845-7. Pages 358 ff.
+ * This implementation is according to the definition of DES in FIPS
+ * PUB 46-2 from December 1993.
+ *
+ * Written by Michael Roth <mroth@nessie.de>, September 1998
+ */
+
+/*
+ *  U S A G E
+ * ===========
+ *
+ * For DES or Triple-DES encryption/decryption you must initialize a proper
+ * encryption context with a key.
+ *
+ * A DES key is 64bit wide but only 56bits of the key are used. The remaining
+ * bits are parity bits and they will _not_ checked in this implementation, but
+ * simply ignored.
+ *
+ * For Triple-DES you could use either two 64bit keys or three 64bit keys.
+ * The parity bits will _not_ checked, too.
+ *
+ * After initializing a context with a key you could use this context to
+ * encrypt or decrypt data in 64bit blocks in Electronic Codebook Mode.
+ *
+ * DES Example
+ * -----------
+ *     unsigned char key[8];
+ *     unsigned char plaintext[8];
+ *     unsigned char ciphertext[8];
+ *     unsigned char recoverd[8];
+ *     des_ctx context;
+ *
+ *     // Fill 'key' and 'plaintext' with some data
+ *     ....
+ *
+ *     // Set up the DES encryption context
+ *     des_setkey(&context, key);
+ *
+ *     // Encrypt the plaintext
+ *     des_ecb_encrypt(&context, plaintext, ciphertext);
+ *
+ *     // To recover the orginal plaintext from ciphertext use:
+ *     des_ecb_decrypt(&context, ciphertext, recoverd);
+ *
+ *
+ * Triple-DES Example
+ * ------------------
+ *     unsigned char key1[8];
+ *     unsigned char key2[8];
+ *     unsigned char key3[8];
+ *     unsigned char plaintext[8];
+ *     unsigned char ciphertext[8];
+ *     unsigned char recoverd[8];
+ *     tripledes_ctx context;
+ *
+ *     // If you would like to use two 64bit keys, fill 'key1' and'key2'
+ *     // then setup the encryption context:
+ *     tripledes_set2keys(&context, key1, key2);
+ *
+ *     // To use three 64bit keys with Triple-DES use:
+ *     tripledes_set3keys(&context, key1, key2, key3);
+ *
+ *     // Encrypting plaintext with Triple-DES
+ *     tripledes_ecb_encrypt(&context, plaintext, ciphertext);
+ *
+ *     // Decrypting ciphertext to recover the plaintext with Triple-DES
+ *     tripledes_ecb_decrypt(&context, ciphertext, recoverd);
+ */
+
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "des.h"
+
+#include <stdio.h>
+#include <string.h>		/* memcpy, memcmp */
+
+/*
+ * The s-box values are permuted according to the 'primitive function P'
+ * and are rotated one bit to the left.
+ */
+static const uint32_t sbox1[64] = {
+  0x01010400, 0x00000000, 0x00010000, 0x01010404, 0x01010004, 0x00010404,
+  0x00000004, 0x00010000, 0x00000400, 0x01010400, 0x01010404, 0x00000400,
+  0x01000404, 0x01010004, 0x01000000, 0x00000004, 0x00000404, 0x01000400,
+  0x01000400, 0x00010400, 0x00010400, 0x01010000, 0x01010000, 0x01000404,
+  0x00010004, 0x01000004, 0x01000004, 0x00010004, 0x00000000, 0x00000404,
+  0x00010404, 0x01000000, 0x00010000, 0x01010404, 0x00000004, 0x01010000,
+  0x01010400, 0x01000000, 0x01000000, 0x00000400, 0x01010004, 0x00010000,
+  0x00010400, 0x01000004, 0x00000400, 0x00000004, 0x01000404, 0x00010404,
+  0x01010404, 0x00010004, 0x01010000, 0x01000404, 0x01000004, 0x00000404,
+  0x00010404, 0x01010400, 0x00000404, 0x01000400, 0x01000400, 0x00000000,
+  0x00010004, 0x00010400, 0x00000000, 0x01010004
+};
+
+static const uint32_t sbox2[64] = {
+  0x80108020, 0x80008000, 0x00008000, 0x00108020, 0x00100000, 0x00000020,
+  0x80100020, 0x80008020, 0x80000020, 0x80108020, 0x80108000, 0x80000000,
+  0x80008000, 0x00100000, 0x00000020, 0x80100020, 0x00108000, 0x00100020,
+  0x80008020, 0x00000000, 0x80000000, 0x00008000, 0x00108020, 0x80100000,
+  0x00100020, 0x80000020, 0x00000000, 0x00108000, 0x00008020, 0x80108000,
+  0x80100000, 0x00008020, 0x00000000, 0x00108020, 0x80100020, 0x00100000,
+  0x80008020, 0x80100000, 0x80108000, 0x00008000, 0x80100000, 0x80008000,
+  0x00000020, 0x80108020, 0x00108020, 0x00000020, 0x00008000, 0x80000000,
+  0x00008020, 0x80108000, 0x00100000, 0x80000020, 0x00100020, 0x80008020,
+  0x80000020, 0x00100020, 0x00108000, 0x00000000, 0x80008000, 0x00008020,
+  0x80000000, 0x80100020, 0x80108020, 0x00108000
+};
+
+static const uint32_t sbox3[64] = {
+  0x00000208, 0x08020200, 0x00000000, 0x08020008, 0x08000200, 0x00000000,
+  0x00020208, 0x08000200, 0x00020008, 0x08000008, 0x08000008, 0x00020000,
+  0x08020208, 0x00020008, 0x08020000, 0x00000208, 0x08000000, 0x00000008,
+  0x08020200, 0x00000200, 0x00020200, 0x08020000, 0x08020008, 0x00020208,
+  0x08000208, 0x00020200, 0x00020000, 0x08000208, 0x00000008, 0x08020208,
+  0x00000200, 0x08000000, 0x08020200, 0x08000000, 0x00020008, 0x00000208,
+  0x00020000, 0x08020200, 0x08000200, 0x00000000, 0x00000200, 0x00020008,
+  0x08020208, 0x08000200, 0x08000008, 0x00000200, 0x00000000, 0x08020008,
+  0x08000208, 0x00020000, 0x08000000, 0x08020208, 0x00000008, 0x00020208,
+  0x00020200, 0x08000008, 0x08020000, 0x08000208, 0x00000208, 0x08020000,
+  0x00020208, 0x00000008, 0x08020008, 0x00020200
+};
+
+static const uint32_t sbox4[64] = {
+  0x00802001, 0x00002081, 0x00002081, 0x00000080, 0x00802080, 0x00800081,
+  0x00800001, 0x00002001, 0x00000000, 0x00802000, 0x00802000, 0x00802081,
+  0x00000081, 0x00000000, 0x00800080, 0x00800001, 0x00000001, 0x00002000,
+  0x00800000, 0x00802001, 0x00000080, 0x00800000, 0x00002001, 0x00002080,
+  0x00800081, 0x00000001, 0x00002080, 0x00800080, 0x00002000, 0x00802080,
+  0x00802081, 0x00000081, 0x00800080, 0x00800001, 0x00802000, 0x00802081,
+  0x00000081, 0x00000000, 0x00000000, 0x00802000, 0x00002080, 0x00800080,
+  0x00800081, 0x00000001, 0x00802001, 0x00002081, 0x00002081, 0x00000080,
+  0x00802081, 0x00000081, 0x00000001, 0x00002000, 0x00800001, 0x00002001,
+  0x00802080, 0x00800081, 0x00002001, 0x00002080, 0x00800000, 0x00802001,
+  0x00000080, 0x00800000, 0x00002000, 0x00802080
+};
+
+static const uint32_t sbox5[64] = {
+  0x00000100, 0x02080100, 0x02080000, 0x42000100, 0x00080000, 0x00000100,
+  0x40000000, 0x02080000, 0x40080100, 0x00080000, 0x02000100, 0x40080100,
+  0x42000100, 0x42080000, 0x00080100, 0x40000000, 0x02000000, 0x40080000,
+  0x40080000, 0x00000000, 0x40000100, 0x42080100, 0x42080100, 0x02000100,
+  0x42080000, 0x40000100, 0x00000000, 0x42000000, 0x02080100, 0x02000000,
+  0x42000000, 0x00080100, 0x00080000, 0x42000100, 0x00000100, 0x02000000,
+  0x40000000, 0x02080000, 0x42000100, 0x40080100, 0x02000100, 0x40000000,
+  0x42080000, 0x02080100, 0x40080100, 0x00000100, 0x02000000, 0x42080000,
+  0x42080100, 0x00080100, 0x42000000, 0x42080100, 0x02080000, 0x00000000,
+  0x40080000, 0x42000000, 0x00080100, 0x02000100, 0x40000100, 0x00080000,
+  0x00000000, 0x40080000, 0x02080100, 0x40000100
+};
+
+static const uint32_t sbox6[64] = {
+  0x20000010, 0x20400000, 0x00004000, 0x20404010, 0x20400000, 0x00000010,
+  0x20404010, 0x00400000, 0x20004000, 0x00404010, 0x00400000, 0x20000010,
+  0x00400010, 0x20004000, 0x20000000, 0x00004010, 0x00000000, 0x00400010,
+  0x20004010, 0x00004000, 0x00404000, 0x20004010, 0x00000010, 0x20400010,
+  0x20400010, 0x00000000, 0x00404010, 0x20404000, 0x00004010, 0x00404000,
+  0x20404000, 0x20000000, 0x20004000, 0x00000010, 0x20400010, 0x00404000,
+  0x20404010, 0x00400000, 0x00004010, 0x20000010, 0x00400000, 0x20004000,
+  0x20000000, 0x00004010, 0x20000010, 0x20404010, 0x00404000, 0x20400000,
+  0x00404010, 0x20404000, 0x00000000, 0x20400010, 0x00000010, 0x00004000,
+  0x20400000, 0x00404010, 0x00004000, 0x00400010, 0x20004010, 0x00000000,
+  0x20404000, 0x20000000, 0x00400010, 0x20004010
+};
+
+static const uint32_t sbox7[64] = {
+  0x00200000, 0x04200002, 0x04000802, 0x00000000, 0x00000800, 0x04000802,
+  0x00200802, 0x04200800, 0x04200802, 0x00200000, 0x00000000, 0x04000002,
+  0x00000002, 0x04000000, 0x04200002, 0x00000802, 0x04000800, 0x00200802,
+  0x00200002, 0x04000800, 0x04000002, 0x04200000, 0x04200800, 0x00200002,
+  0x04200000, 0x00000800, 0x00000802, 0x04200802, 0x00200800, 0x00000002,
+  0x04000000, 0x00200800, 0x04000000, 0x00200800, 0x00200000, 0x04000802,
+  0x04000802, 0x04200002, 0x04200002, 0x00000002, 0x00200002, 0x04000000,
+  0x04000800, 0x00200000, 0x04200800, 0x00000802, 0x00200802, 0x04200800,
+  0x00000802, 0x04000002, 0x04200802, 0x04200000, 0x00200800, 0x00000000,
+  0x00000002, 0x04200802, 0x00000000, 0x00200802, 0x04200000, 0x00000800,
+  0x04000002, 0x04000800, 0x00000800, 0x00200002
+};
+
+static const uint32_t sbox8[64] = {
+  0x10001040, 0x00001000, 0x00040000, 0x10041040, 0x10000000, 0x10001040,
+  0x00000040, 0x10000000, 0x00040040, 0x10040000, 0x10041040, 0x00041000,
+  0x10041000, 0x00041040, 0x00001000, 0x00000040, 0x10040000, 0x10000040,
+  0x10001000, 0x00001040, 0x00041000, 0x00040040, 0x10040040, 0x10041000,
+  0x00001040, 0x00000000, 0x00000000, 0x10040040, 0x10000040, 0x10001000,
+  0x00041040, 0x00040000, 0x00041040, 0x00040000, 0x10041000, 0x00001000,
+  0x00000040, 0x10040040, 0x00001000, 0x00041040, 0x10001000, 0x00000040,
+  0x10000040, 0x10040000, 0x10040040, 0x10000000, 0x00040000, 0x10001040,
+  0x00000000, 0x10041040, 0x00040040, 0x10000040, 0x10040000, 0x10001000,
+  0x10001040, 0x00000000, 0x10041040, 0x00041000, 0x00041000, 0x00001040,
+  0x00001040, 0x00040040, 0x10000000, 0x10041000
+};
+
+/*
+ * These two tables are part of the 'permuted choice 1' function.
+ * In this implementation several speed improvements are done.
+ */
+static const uint32_t leftkey_swap[16] = {
+  0x00000000, 0x00000001, 0x00000100, 0x00000101,
+  0x00010000, 0x00010001, 0x00010100, 0x00010101,
+  0x01000000, 0x01000001, 0x01000100, 0x01000101,
+  0x01010000, 0x01010001, 0x01010100, 0x01010101
+};
+
+static const uint32_t rightkey_swap[16] = {
+  0x00000000, 0x01000000, 0x00010000, 0x01010000,
+  0x00000100, 0x01000100, 0x00010100, 0x01010100,
+  0x00000001, 0x01000001, 0x00010001, 0x01010001,
+  0x00000101, 0x01000101, 0x00010101, 0x01010101,
+};
+
+/*
+ * Numbers of left shifts per round for encryption subkeys.  To
+ * calculate the decryption subkeys we just reverse the ordering of
+ * the calculated encryption subkeys, so there is no need for a
+ * decryption rotate tab.
+ */
+static const unsigned char encrypt_rotate_tab[16] = {
+  1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
+};
+
+/*
+ * Table with weak DES keys sorted in ascending order.  In DES there
+ * are 64 known keys which are weak. They are weak because they
+ * produce only one, two or four different subkeys in the subkey
+ * scheduling process.  The keys in this table have all their parity
+ * bits cleared.
+ */
+static const unsigned char weak_keys[64][8] = {
+  {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},	/*w */
+  {0x00, 0x00, 0x1e, 0x1e, 0x00, 0x00, 0x0e, 0x0e},
+  {0x00, 0x00, 0xe0, 0xe0, 0x00, 0x00, 0xf0, 0xf0},
+  {0x00, 0x00, 0xfe, 0xfe, 0x00, 0x00, 0xfe, 0xfe},
+  {0x00, 0x1e, 0x00, 0x1e, 0x00, 0x0e, 0x00, 0x0e},	/*sw */
+  {0x00, 0x1e, 0x1e, 0x00, 0x00, 0x0e, 0x0e, 0x00},
+  {0x00, 0x1e, 0xe0, 0xfe, 0x00, 0x0e, 0xf0, 0xfe},
+  {0x00, 0x1e, 0xfe, 0xe0, 0x00, 0x0e, 0xfe, 0xf0},
+  {0x00, 0xe0, 0x00, 0xe0, 0x00, 0xf0, 0x00, 0xf0},	/*sw */
+  {0x00, 0xe0, 0x1e, 0xfe, 0x00, 0xf0, 0x0e, 0xfe},
+  {0x00, 0xe0, 0xe0, 0x00, 0x00, 0xf0, 0xf0, 0x00},
+  {0x00, 0xe0, 0xfe, 0x1e, 0x00, 0xf0, 0xfe, 0x0e},
+  {0x00, 0xfe, 0x00, 0xfe, 0x00, 0xfe, 0x00, 0xfe},	/*sw */
+  {0x00, 0xfe, 0x1e, 0xe0, 0x00, 0xfe, 0x0e, 0xf0},
+  {0x00, 0xfe, 0xe0, 0x1e, 0x00, 0xfe, 0xf0, 0x0e},
+  {0x00, 0xfe, 0xfe, 0x00, 0x00, 0xfe, 0xfe, 0x00},
+  {0x1e, 0x00, 0x00, 0x1e, 0x0e, 0x00, 0x00, 0x0e},
+  {0x1e, 0x00, 0x1e, 0x00, 0x0e, 0x00, 0x0e, 0x00},	/*sw */
+  {0x1e, 0x00, 0xe0, 0xfe, 0x0e, 0x00, 0xf0, 0xfe},
+  {0x1e, 0x00, 0xfe, 0xe0, 0x0e, 0x00, 0xfe, 0xf0},
+  {0x1e, 0x1e, 0x00, 0x00, 0x0e, 0x0e, 0x00, 0x00},
+  {0x1e, 0x1e, 0x1e, 0x1e, 0x0e, 0x0e, 0x0e, 0x0e},	/*w */
+  {0x1e, 0x1e, 0xe0, 0xe0, 0x0e, 0x0e, 0xf0, 0xf0},
+  {0x1e, 0x1e, 0xfe, 0xfe, 0x0e, 0x0e, 0xfe, 0xfe},
+  {0x1e, 0xe0, 0x00, 0xfe, 0x0e, 0xf0, 0x00, 0xfe},
+  {0x1e, 0xe0, 0x1e, 0xe0, 0x0e, 0xf0, 0x0e, 0xf0},	/*sw */
+  {0x1e, 0xe0, 0xe0, 0x1e, 0x0e, 0xf0, 0xf0, 0x0e},
+  {0x1e, 0xe0, 0xfe, 0x00, 0x0e, 0xf0, 0xfe, 0x00},
+  {0x1e, 0xfe, 0x00, 0xe0, 0x0e, 0xfe, 0x00, 0xf0},
+  {0x1e, 0xfe, 0x1e, 0xfe, 0x0e, 0xfe, 0x0e, 0xfe},	/*sw */
+  {0x1e, 0xfe, 0xe0, 0x00, 0x0e, 0xfe, 0xf0, 0x00},
+  {0x1e, 0xfe, 0xfe, 0x1e, 0x0e, 0xfe, 0xfe, 0x0e},
+  {0xe0, 0x00, 0x00, 0xe0, 0xf0, 0x00, 0x00, 0xf0},
+  {0xe0, 0x00, 0x1e, 0xfe, 0xf0, 0x00, 0x0e, 0xfe},
+  {0xe0, 0x00, 0xe0, 0x00, 0xf0, 0x00, 0xf0, 0x00},	/*sw */
+  {0xe0, 0x00, 0xfe, 0x1e, 0xf0, 0x00, 0xfe, 0x0e},
+  {0xe0, 0x1e, 0x00, 0xfe, 0xf0, 0x0e, 0x00, 0xfe},
+  {0xe0, 0x1e, 0x1e, 0xe0, 0xf0, 0x0e, 0x0e, 0xf0},
+  {0xe0, 0x1e, 0xe0, 0x1e, 0xf0, 0x0e, 0xf0, 0x0e},	/*sw */
+  {0xe0, 0x1e, 0xfe, 0x00, 0xf0, 0x0e, 0xfe, 0x00},
+  {0xe0, 0xe0, 0x00, 0x00, 0xf0, 0xf0, 0x00, 0x00},
+  {0xe0, 0xe0, 0x1e, 0x1e, 0xf0, 0xf0, 0x0e, 0x0e},
+  {0xe0, 0xe0, 0xe0, 0xe0, 0xf0, 0xf0, 0xf0, 0xf0},	/*w */
+  {0xe0, 0xe0, 0xfe, 0xfe, 0xf0, 0xf0, 0xfe, 0xfe},
+  {0xe0, 0xfe, 0x00, 0x1e, 0xf0, 0xfe, 0x00, 0x0e},
+  {0xe0, 0xfe, 0x1e, 0x00, 0xf0, 0xfe, 0x0e, 0x00},
+  {0xe0, 0xfe, 0xe0, 0xfe, 0xf0, 0xfe, 0xf0, 0xfe},	/*sw */
+  {0xe0, 0xfe, 0xfe, 0xe0, 0xf0, 0xfe, 0xfe, 0xf0},
+  {0xfe, 0x00, 0x00, 0xfe, 0xfe, 0x00, 0x00, 0xfe},
+  {0xfe, 0x00, 0x1e, 0xe0, 0xfe, 0x00, 0x0e, 0xf0},
+  {0xfe, 0x00, 0xe0, 0x1e, 0xfe, 0x00, 0xf0, 0x0e},
+  {0xfe, 0x00, 0xfe, 0x00, 0xfe, 0x00, 0xfe, 0x00},	/*sw */
+  {0xfe, 0x1e, 0x00, 0xe0, 0xfe, 0x0e, 0x00, 0xf0},
+  {0xfe, 0x1e, 0x1e, 0xfe, 0xfe, 0x0e, 0x0e, 0xfe},
+  {0xfe, 0x1e, 0xe0, 0x00, 0xfe, 0x0e, 0xf0, 0x00},
+  {0xfe, 0x1e, 0xfe, 0x1e, 0xfe, 0x0e, 0xfe, 0x0e},	/*sw */
+  {0xfe, 0xe0, 0x00, 0x1e, 0xfe, 0xf0, 0x00, 0x0e},
+  {0xfe, 0xe0, 0x1e, 0x00, 0xfe, 0xf0, 0x0e, 0x00},
+  {0xfe, 0xe0, 0xe0, 0xfe, 0xfe, 0xf0, 0xf0, 0xfe},
+  {0xfe, 0xe0, 0xfe, 0xe0, 0xfe, 0xf0, 0xfe, 0xf0},	/*sw */
+  {0xfe, 0xfe, 0x00, 0x00, 0xfe, 0xfe, 0x00, 0x00},
+  {0xfe, 0xfe, 0x1e, 0x1e, 0xfe, 0xfe, 0x0e, 0x0e},
+  {0xfe, 0xfe, 0xe0, 0xe0, 0xfe, 0xfe, 0xf0, 0xf0},
+  {0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe}	/*w */
+};
+static const unsigned char weak_keys_chksum[20] = {
+  0xD0, 0xCF, 0x07, 0x38, 0x93, 0x70, 0x8A, 0x83, 0x7D, 0xD7,
+  0x8A, 0x36, 0x65, 0x29, 0x6C, 0x1F, 0x7C, 0x3F, 0xD3, 0x41
+};
+
+bool
+des_is_weak_key (const char * key)
+{
+  char work[8];
+  int i, left, right, middle, cmp_result;
+
+  /* clear parity bits */
+  for (i = 0; i < 8; ++i)
+    work[i] = ((unsigned char)key[i]) & 0xfe;
+
+  /* binary search in the weak key table */
+  left = 0;
+  right = 63;
+  while (left <= right)
+    {
+      middle = (left + right) / 2;
+
+      if (!(cmp_result = memcmp (work, weak_keys[middle], 8)))
+	return -1;
+
+      if (cmp_result > 0)
+	left = middle + 1;
+      else
+	right = middle - 1;
+    }
+
+  return 0;
+}
+
+/*
+ * Macro to swap bits across two words.
+ */
+#define DO_PERMUTATION(a, temp, b, offset, mask)	\
+    temp = ((a>>offset) ^ b) & mask;			\
+    b ^= temp;						\
+    a ^= temp<<offset;
+
+
+/*
+ * This performs the 'initial permutation' of the data to be encrypted
+ * or decrypted. Additionally the resulting two words are rotated one bit
+ * to the left.
+ */
+#define INITIAL_PERMUTATION(left, temp, right)		\
+    DO_PERMUTATION(left, temp, right, 4, 0x0f0f0f0f)	\
+    DO_PERMUTATION(left, temp, right, 16, 0x0000ffff)	\
+    DO_PERMUTATION(right, temp, left, 2, 0x33333333)	\
+    DO_PERMUTATION(right, temp, left, 8, 0x00ff00ff)	\
+    right =  (right << 1) | (right >> 31);		\
+    temp  =  (left ^ right) & 0xaaaaaaaa;		\
+    right ^= temp;					\
+    left  ^= temp;					\
+    left  =  (left << 1) | (left >> 31);
+
+/*
+ * The 'inverse initial permutation'.
+ */
+#define FINAL_PERMUTATION(left, temp, right)		\
+    left  =  (left << 31) | (left >> 1);		\
+    temp  =  (left ^ right) & 0xaaaaaaaa;		\
+    left  ^= temp;					\
+    right ^= temp;					\
+    right  =  (right << 31) | (right >> 1);		\
+    DO_PERMUTATION(right, temp, left, 8, 0x00ff00ff)	\
+    DO_PERMUTATION(right, temp, left, 2, 0x33333333)	\
+    DO_PERMUTATION(left, temp, right, 16, 0x0000ffff)	\
+    DO_PERMUTATION(left, temp, right, 4, 0x0f0f0f0f)
+
+
+/*
+ * A full DES round including 'expansion function', 'sbox substitution'
+ * and 'primitive function P' but without swapping the left and right word.
+ * Please note: The data in 'from' and 'to' is already rotated one bit to
+ * the left, done in the initial permutation.
+ */
+#define DES_ROUND(from, to, work, subkey)		\
+    work = from ^ *subkey++;				\
+    to ^= sbox8[  work	    & 0x3f ];			\
+    to ^= sbox6[ (work>>8)  & 0x3f ];			\
+    to ^= sbox4[ (work>>16) & 0x3f ];			\
+    to ^= sbox2[ (work>>24) & 0x3f ];			\
+    work = ((from << 28) | (from >> 4)) ^ *subkey++;	\
+    to ^= sbox7[  work	    & 0x3f ];			\
+    to ^= sbox5[ (work>>8)  & 0x3f ];			\
+    to ^= sbox3[ (work>>16) & 0x3f ];			\
+    to ^= sbox1[ (work>>24) & 0x3f ];
+
+/*
+ * Macros to convert 8 bytes from/to 32bit words.
+ */
+#define READ_64BIT_DATA(data, left, right)				   \
+    left  = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];  \
+    right = (data[4] << 24) | (data[5] << 16) | (data[6] << 8) | data[7];
+
+#define WRITE_64BIT_DATA(data, left, right)				   \
+    data[0] = (left >> 24) &0xff; data[1] = (left >> 16) &0xff; 	   \
+    data[2] = (left >> 8) &0xff; data[3] = left &0xff;			   \
+    data[4] = (right >> 24) &0xff; data[5] = (right >> 16) &0xff;	   \
+    data[6] = (right >> 8) &0xff; data[7] = right &0xff;
+
+/*
+ * Handy macros for encryption and decryption of data
+ */
+#define des_ecb_encrypt(ctx, from, to)	      des_ecb_crypt(ctx, from, to, 0)
+#define des_ecb_decrypt(ctx, from, to)	      des_ecb_crypt(ctx, from, to, 1)
+#define tripledes_ecb_encrypt(ctx, from, to) tripledes_ecb_crypt(ctx,from,to,0)
+#define tripledes_ecb_decrypt(ctx, from, to) tripledes_ecb_crypt(ctx,from,to,1)
+
+/*
+ * des_key_schedule():	  Calculate 16 subkeys pairs (even/odd) for
+ *			  16 encryption rounds.
+ *			  To calculate subkeys for decryption the caller
+ *			  have to reorder the generated subkeys.
+ *
+ *    rawkey:	    8 Bytes of key data
+ *    subkey:	    Array of at least 32 uint32_ts. Will be filled
+ *		    with calculated subkeys.
+ *
+ */
+static void
+des_key_schedule (const char * _rawkey, uint32_t * subkey)
+{
+  const unsigned char *rawkey = _rawkey;
+  uint32_t left, right, work;
+  int round;
+
+  READ_64BIT_DATA (rawkey, left, right)
+    DO_PERMUTATION (right, work, left, 4, 0x0f0f0f0f)
+    DO_PERMUTATION (right, work, left, 0, 0x10101010)
+    left = ((leftkey_swap[(left >> 0) & 0xf] << 3)
+	    | (leftkey_swap[(left >> 8) & 0xf] << 2)
+	    | (leftkey_swap[(left >> 16) & 0xf] << 1)
+	    | (leftkey_swap[(left >> 24) & 0xf])
+	    | (leftkey_swap[(left >> 5) & 0xf] << 7)
+	    | (leftkey_swap[(left >> 13) & 0xf] << 6)
+	    | (leftkey_swap[(left >> 21) & 0xf] << 5)
+	    | (leftkey_swap[(left >> 29) & 0xf] << 4));
+
+  left &= 0x0fffffff;
+
+  right = ((rightkey_swap[(right >> 1) & 0xf] << 3)
+	   | (rightkey_swap[(right >> 9) & 0xf] << 2)
+	   | (rightkey_swap[(right >> 17) & 0xf] << 1)
+	   | (rightkey_swap[(right >> 25) & 0xf])
+	   | (rightkey_swap[(right >> 4) & 0xf] << 7)
+	   | (rightkey_swap[(right >> 12) & 0xf] << 6)
+	   | (rightkey_swap[(right >> 20) & 0xf] << 5)
+	   | (rightkey_swap[(right >> 28) & 0xf] << 4));
+
+  right &= 0x0fffffff;
+
+  for (round = 0; round < 16; ++round)
+    {
+      left = ((left << encrypt_rotate_tab[round])
+	      | (left >> (28 - encrypt_rotate_tab[round]))) & 0x0fffffff;
+      right = ((right << encrypt_rotate_tab[round])
+	       | (right >> (28 - encrypt_rotate_tab[round]))) & 0x0fffffff;
+
+      *subkey++ = (((left << 4) & 0x24000000)
+		   | ((left << 28) & 0x10000000)
+		   | ((left << 14) & 0x08000000)
+		   | ((left << 18) & 0x02080000)
+		   | ((left << 6) & 0x01000000)
+		   | ((left << 9) & 0x00200000)
+		   | ((left >> 1) & 0x00100000)
+		   | ((left << 10) & 0x00040000)
+		   | ((left << 2) & 0x00020000)
+		   | ((left >> 10) & 0x00010000)
+		   | ((right >> 13) & 0x00002000)
+		   | ((right >> 4) & 0x00001000)
+		   | ((right << 6) & 0x00000800)
+		   | ((right >> 1) & 0x00000400)
+		   | ((right >> 14) & 0x00000200)
+		   | (right & 0x00000100)
+		   | ((right >> 5) & 0x00000020)
+		   | ((right >> 10) & 0x00000010)
+		   | ((right >> 3) & 0x00000008)
+		   | ((right >> 18) & 0x00000004)
+		   | ((right >> 26) & 0x00000002)
+		   | ((right >> 24) & 0x00000001));
+
+      *subkey++ = (((left << 15) & 0x20000000)
+		   | ((left << 17) & 0x10000000)
+		   | ((left << 10) & 0x08000000)
+		   | ((left << 22) & 0x04000000)
+		   | ((left >> 2) & 0x02000000)
+		   | ((left << 1) & 0x01000000)
+		   | ((left << 16) & 0x00200000)
+		   | ((left << 11) & 0x00100000)
+		   | ((left << 3) & 0x00080000)
+		   | ((left >> 6) & 0x00040000)
+		   | ((left << 15) & 0x00020000)
+		   | ((left >> 4) & 0x00010000)
+		   | ((right >> 2) & 0x00002000)
+		   | ((right << 8) & 0x00001000)
+		   | ((right >> 14) & 0x00000808)
+		   | ((right >> 9) & 0x00000400)
+		   | ((right) & 0x00000200)
+		   | ((right << 7) & 0x00000100)
+		   | ((right >> 7) & 0x00000020)
+		   | ((right >> 3) & 0x00000011)
+		   | ((right << 2) & 0x00000004)
+		   | ((right >> 21) & 0x00000002));
+    }
+}
+
+void
+des_setkey (des_ctx *ctx, const char * key)
+{
+  int i;
+
+  des_key_schedule (key, ctx->encrypt_subkeys);
+
+  for (i = 0; i < 32; i += 2)
+    {
+      ctx->decrypt_subkeys[i] = ctx->encrypt_subkeys[30 - i];
+      ctx->decrypt_subkeys[i + 1] = ctx->encrypt_subkeys[31 - i];
+    }
+}
+
+bool
+des_makekey (des_ctx *ctx, const char * key, size_t keylen)
+{
+  if (keylen != 8)
+    return false;
+
+  des_setkey (ctx, key);
+
+  return !des_is_weak_key (key);
+}
+
+void
+des_ecb_crypt (des_ctx *ctx, const char * _from, char * _to, int mode)
+{
+  const unsigned char *from = _from;
+  unsigned char *to = _to;
+  uint32_t left, right, work;
+  uint32_t *keys;
+
+  keys = mode ? ctx->decrypt_subkeys : ctx->encrypt_subkeys;
+
+  READ_64BIT_DATA (from, left, right)
+    INITIAL_PERMUTATION (left, work, right)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    FINAL_PERMUTATION (right, work, left)
+    WRITE_64BIT_DATA (to, right, left)
+}
+
+void
+tripledes_set2keys (tripledes_ctx *ctx, const char * key1, const char * key2)
+{
+  int i;
+
+  des_key_schedule (key1, ctx->encrypt_subkeys);
+  des_key_schedule (key2, &(ctx->decrypt_subkeys[32]));
+
+  for (i = 0; i < 32; i += 2)
+    {
+      ctx->decrypt_subkeys[i] = ctx->encrypt_subkeys[30 - i];
+      ctx->decrypt_subkeys[i + 1] = ctx->encrypt_subkeys[31 - i];
+
+      ctx->encrypt_subkeys[i + 32] = ctx->decrypt_subkeys[62 - i];
+      ctx->encrypt_subkeys[i + 33] = ctx->decrypt_subkeys[63 - i];
+
+      ctx->encrypt_subkeys[i + 64] = ctx->encrypt_subkeys[i];
+      ctx->encrypt_subkeys[i + 65] = ctx->encrypt_subkeys[i + 1];
+
+      ctx->decrypt_subkeys[i + 64] = ctx->decrypt_subkeys[i];
+      ctx->decrypt_subkeys[i + 65] = ctx->decrypt_subkeys[i + 1];
+    }
+}
+
+void
+tripledes_set3keys (tripledes_ctx *ctx, const char * key1,
+		    const char * key2, const char * key3)
+{
+  int i;
+
+  des_key_schedule (key1, ctx->encrypt_subkeys);
+  des_key_schedule (key2, &(ctx->decrypt_subkeys[32]));
+  des_key_schedule (key3, &(ctx->encrypt_subkeys[64]));
+
+  for (i = 0; i < 32; i += 2)
+    {
+      ctx->decrypt_subkeys[i] = ctx->encrypt_subkeys[94 - i];
+      ctx->decrypt_subkeys[i + 1] = ctx->encrypt_subkeys[95 - i];
+
+      ctx->encrypt_subkeys[i + 32] = ctx->decrypt_subkeys[62 - i];
+      ctx->encrypt_subkeys[i + 33] = ctx->decrypt_subkeys[63 - i];
+
+      ctx->decrypt_subkeys[i + 64] = ctx->encrypt_subkeys[30 - i];
+      ctx->decrypt_subkeys[i + 65] = ctx->encrypt_subkeys[31 - i];
+    }
+}
+
+void
+tripledes_ecb_crypt (tripledes_ctx *ctx,
+		     const char * _from,
+		     char * _to, int mode)
+{
+  const unsigned char *from = _from;
+  unsigned char *to = _to;
+  uint32_t left, right, work;
+  uint32_t *keys;
+
+  keys = mode ? ctx->decrypt_subkeys : ctx->encrypt_subkeys;
+
+  READ_64BIT_DATA (from, left, right)
+    INITIAL_PERMUTATION (left, work, right)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
+    DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
+    DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
+    DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
+    DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
+    DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
+    DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
+    DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
+    FINAL_PERMUTATION (right, work, left)
+    WRITE_64BIT_DATA (to, right, left)
+}
+
+bool
+tripledes_makekey (tripledes_ctx *ctx, const char * key, size_t keylen)
+{
+  if (keylen != 24)
+    return false;
+
+  tripledes_set3keys (ctx, key, key + 8, key + 16);
+
+  return !(des_is_weak_key (key)
+	   || des_is_weak_key (key + 8)
+	   || des_is_weak_key (key + 16));
+}