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/* serpent-internal-h
*
* The serpent block cipher.
*
* For more details on this algorithm, see the Serpent website at
* http://www.cl.cam.ac.uk/~rja14/serpent.html
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2011 Niels Möller
* Copyright (C) 2010, 2011 Simon Josefsson
* Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
/* This file is derived from cipher/serpent.c in Libgcrypt v1.4.6.
The adaption to Nettle was made by Simon Josefsson on 2010-12-07
with final touches on 2011-05-30. Changes include replacing
libgcrypt with nettle in the license template, renaming
serpent_context to serpent_ctx, renaming u32 to uint32_t, removing
libgcrypt stubs and selftests, modifying entry function prototypes,
using FOR_BLOCKS to iterate through data in encrypt/decrypt, using
LE_READ_UINT32 and LE_WRITE_UINT32 to access data in
encrypt/decrypt, and running indent on the code. */
#ifndef NETTLE_SERPENT_INTERNAL_H_INCLUDED
#define NETTLE_SERPENT_INTERNAL_H_INCLUDED
/* FIXME: Unify ROL macros used here, in camellia.c and cast128.c. */
#define ROL32(x,n) ((((x))<<(n)) | (((x))>>(32-(n))))
#define KEYXOR(x0,x1,x2,x3, subkey) \
do { \
(x0) ^= (subkey)[0]; \
(x1) ^= (subkey)[1]; \
(x2) ^= (subkey)[2]; \
(x3) ^= (subkey)[3]; \
} while (0)
#if HAVE_NATIVE_64_BIT
/* Operate independently on both halves of a 64-bit word. */
#define ROL64(x,n) \
(((x) << (n) & ~(((1L << (n))-1) << 32)) \
|(((x) >> (32-(n))) & ~(((1L << (32-(n)))-1) << (n))))
#define KEYXOR64(x0,x1,x2,x3, subkey) \
do { \
uint64_t _sk; \
_sk = (subkey)[0]; _sk |= _sk << 32; (x0) ^= _sk; \
_sk = (subkey)[1]; _sk |= _sk << 32; (x1) ^= _sk; \
_sk = (subkey)[2]; _sk |= _sk << 32; (x2) ^= _sk; \
_sk = (subkey)[3]; _sk |= _sk << 32; (x3) ^= _sk; \
} while (0)
#define RSHIFT64(x,n) \
( ((x) << (n)) & ~(((1L << n) - 1) << 32))
#endif /* HAVE_NATIVE_64_BIT */
#endif /* NETTLE_SERPENT_INTERNAL_H_INCLUDED */
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