kc3-lang/gnulib/lib/des.c

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• Hash : cb4810b4
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  Date : 2007-03-19T10:07:27
  

  2007-03-19  Simon Josefsson  <simon@josefsson.org>
  
  	* des.c: Remove weak_keys_chksum.  Reported by Bruno Haible
  	<bruno@clisp.org>.
  

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• lib/des.c

• /* des.c --- DES and Triple-DES encryption/decryption Algorithm
   * Copyright (C) 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007
   *    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];
   *     gl_des_ctx context;
   *
   *     // Fill 'key' and 'plaintext' with some data
   *     ....
   *
   *     // Set up the DES encryption context
   *     gl_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];
   *     gl_3des_ctx context;
   *
   *     // If you would like to use two 64bit keys, fill 'key1' and'key2'
   *     // then setup the encryption context:
   *     gl_3des_set2keys(&context, key1, key2);
   *
   *     // To use three 64bit keys with Triple-DES use:
   *     gl_3des_set3keys(&context, key1, key2, key3);
   *
   *     // Encrypting plaintext with Triple-DES
   *     gl_3des_ecb_encrypt(&context, plaintext, ciphertext);
   *
   *     // Decrypting ciphertext to recover the plaintext with Triple-DES
   *     gl_3des_ecb_decrypt(&context, ciphertext, recoverd);
   */
  
  
  #include <config.h>
  
  #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 */
  };
  
  bool
  gl_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;
  
  /*
   * 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 = (const unsigned char *) _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
  gl_des_setkey (gl_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
  gl_des_makekey (gl_des_ctx *ctx, const char * key, size_t keylen)
  {
    if (keylen != 8)
      return false;
  
    gl_des_setkey (ctx, key);
  
    return !gl_des_is_weak_key (key);
  }
  
  void
  gl_des_ecb_crypt (gl_des_ctx *ctx, const char * _from, char * _to, int mode)
  {
    const unsigned char *from = (const unsigned char *) _from;
    unsigned char *to = (unsigned char *) _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
  gl_3des_set2keys (gl_3des_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
  gl_3des_set3keys (gl_3des_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
  gl_3des_ecb_crypt (gl_3des_ctx *ctx,
  		   const char * _from,
  		   char * _to, int mode)
  {
    const unsigned char *from = (const unsigned char *) _from;
    unsigned char *to = (unsigned char *) _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
  gl_3des_makekey (gl_3des_ctx *ctx, const char * key, size_t keylen)
  {
    if (keylen != 24)
      return false;
  
    gl_3des_set3keys (ctx, key, key + 8, key + 16);
  
    return !(gl_des_is_weak_key (key)
  	   || gl_des_is_weak_key (key + 8)
  	   || gl_des_is_weak_key (key + 16));
  }
  

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