release/src/router/nettle/serpent-internal.h

   1 /* serpent-internal-h
   2  *
   3  * The serpent block cipher.
   4  *
   5  * For more details on this algorithm, see the Serpent website at
   6  * http://www.cl.cam.ac.uk/~rja14/serpent.html
   7  */
   8
   9 /* nettle, low-level cryptographics library
  10  *
  11  * Copyright (C) 2011  Niels Möller
  12  * Copyright (C) 2010, 2011  Simon Josefsson
  13  * Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
  14  *
  15  * The nettle library is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU Lesser General Public License as published by
  17  * the Free Software Foundation; either version 2.1 of the License, or (at your
  18  * option) any later version.
  19  *
  20  * The nettle library is distributed in the hope that it will be useful, but
  21  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  22  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  23  * License for more details.
  24  *
  25  * You should have received a copy of the GNU Lesser General Public License
  26  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  27  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  28  * MA 02111-1301, USA.
  29  */
  30
  31 /* This file is derived from cipher/serpent.c in Libgcrypt v1.4.6.
  32    The adaption to Nettle was made by Simon Josefsson on 2010-12-07
  33    with final touches on 2011-05-30.  Changes include replacing
  34    libgcrypt with nettle in the license template, renaming
  35    serpent_context to serpent_ctx, renaming u32 to uint32_t, removing
  36    libgcrypt stubs and selftests, modifying entry function prototypes,
  37    using FOR_BLOCKS to iterate through data in encrypt/decrypt, using
  38    LE_READ_UINT32 and LE_WRITE_UINT32 to access data in
  39    encrypt/decrypt, and running indent on the code. */
  40
  41 #ifndef NETTLE_SERPENT_INTERNAL_H_INCLUDED
  42 #define NETTLE_SERPENT_INTERNAL_H_INCLUDED
  43
  44 #define KEYXOR(x0,x1,x2,x3, subkey)                    \
  45   do {                                                 \
  46     (x0) ^= (subkey)[0];                               \
  47     (x1) ^= (subkey)[1];                               \
  48     (x2) ^= (subkey)[2];                               \
  49     (x3) ^= (subkey)[3];                               \
  50   } while (0)
  51
  52 #if HAVE_NATIVE_64_BIT
  53 /* Operate independently on both halves of a 64-bit word. */
  54 #define DROTL32(n,x) \
  55   (((x) << (n) & ~((((uint64_t) 1 << (n))-1) << 32)) \
  56    |(((x) >> (32-(n))) & ~((((uint64_t) 1 << (32-(n)))-1) << (n))))
  57
  58 #define KEYXOR64(x0,x1,x2,x3, subkey)                  \
  59   do {                                                 \
  60     uint64_t _sk;                                      \
  61     _sk = (subkey)[0]; _sk |= _sk << 32; (x0) ^= _sk;    \
  62     _sk = (subkey)[1]; _sk |= _sk << 32; (x1) ^= _sk;    \
  63     _sk = (subkey)[2]; _sk |= _sk << 32; (x2) ^= _sk;    \
  64     _sk = (subkey)[3]; _sk |= _sk << 32; (x3) ^= _sk;    \
  65   } while (0)
  66
  67 #define DRSHIFT32(n,x) \
  68   ( ((x) << (n)) & ~((((uint64_t) 1 << (n)) - 1) << 32))
  69 #endif /* HAVE_NATIVE_64_BIT */
  70
  71 #endif /* NETTLE_SERPENT_INTERNAL_H_INCLUDED */
  72