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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
Copyright (C) 2011 Niels Möller
Copyright (C) 2010, 2011 Simon Josefsson
Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle 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 copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
*/
/* 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
#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 DROTL32(n,x) \
(((x) << (n) & ~((((uint64_t) 1 << (n))-1) << 32)) \
|(((x) >> (32-(n))) & ~((((uint64_t) 1 << (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 DRSHIFT32(n,x) \
( ((x) << (n)) & ~((((uint64_t) 1 << (n)) - 1) << 32))
#endif /* HAVE_NATIVE_64_BIT */
#endif /* NETTLE_SERPENT_INTERNAL_H_INCLUDED */
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