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/* Rijndael (AES) for GnuPG
* Copyright (C) 2000, 2001, 2002, 2003, 2007,
* 2008, 2011, 2012 Free Software Foundation, Inc.
*
* This file is part of Libgcrypt.
*
* Libgcrypt 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.
*
* Libgcrypt 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 this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef G10_RIJNDAEL_INTERNAL_H
#define G10_RIJNDAEL_INTERNAL_H
#include "types.h" /* for byte and u32 typedefs */
#define MAXKC (256/32)
#define MAXROUNDS 14
#define BLOCKSIZE (128/8)
/* Helper macro to force alignment to 16 bytes. */
#ifdef HAVE_GCC_ATTRIBUTE_ALIGNED
# define ATTR_ALIGNED_16 __attribute__ ((aligned (16)))
#else
# define ATTR_ALIGNED_16
#endif
/* USE_AMD64_ASM indicates whether to use AMD64 assembly code. */
#undef USE_AMD64_ASM
#if defined(__x86_64__) && defined(HAVE_COMPATIBLE_GCC_AMD64_PLATFORM_AS)
# define USE_AMD64_ASM 1
#endif
/* USE_ARM_ASM indicates whether to use ARM assembly code. */
#undef USE_ARM_ASM
#if defined(__ARMEL__)
# ifdef HAVE_COMPATIBLE_GCC_ARM_PLATFORM_AS
# define USE_ARM_ASM 1
# endif
#endif
/* USE_PADLOCK indicates whether to compile the padlock specific
code. */
#undef USE_PADLOCK
#ifdef ENABLE_PADLOCK_SUPPORT
# ifdef HAVE_GCC_ATTRIBUTE_ALIGNED
# if (defined (__i386__) && SIZEOF_UNSIGNED_LONG == 4) || defined(__x86_64__)
# define USE_PADLOCK 1
# endif
# endif
#endif /*ENABLE_PADLOCK_SUPPORT*/
/* USE_AESNI inidicates whether to compile with Intel AES-NI code. We
need the vector-size attribute which seems to be available since
gcc 3. However, to be on the safe side we require at least gcc 4. */
#undef USE_AESNI
#ifdef ENABLE_AESNI_SUPPORT
# if ((defined (__i386__) && SIZEOF_UNSIGNED_LONG == 4) || defined(__x86_64__))
# if __GNUC__ >= 4
# define USE_AESNI 1
# endif
# endif
#endif /* ENABLE_AESNI_SUPPORT */
struct RIJNDAEL_context_s;
typedef unsigned int (*rijndael_cryptfn_t)(const struct RIJNDAEL_context_s *ctx,
unsigned char *bx,
const unsigned char *ax);
typedef void (*rijndael_prefetchfn_t)(void);
/* Our context object. */
typedef struct RIJNDAEL_context_s
{
/* The first fields are the keyschedule arrays. This is so that
they are aligned on a 16 byte boundary if using gcc. This
alignment is required for the AES-NI code and a good idea in any
case. The alignment is guaranteed due to the way cipher.c
allocates the space for the context. The PROPERLY_ALIGNED_TYPE
hack is used to force a minimal alignment if not using gcc of if
the alignment requirement is higher that 16 bytes. */
union
{
PROPERLY_ALIGNED_TYPE dummy;
byte keyschedule[MAXROUNDS+1][4][4];
#ifdef USE_PADLOCK
/* The key as passed to the padlock engine. It is only used if
the padlock engine is used (USE_PADLOCK, below). */
unsigned char padlock_key[16] __attribute__ ((aligned (16)));
#endif /*USE_PADLOCK*/
} u1;
union
{
PROPERLY_ALIGNED_TYPE dummy;
byte keyschedule[MAXROUNDS+1][4][4];
} u2;
int rounds; /* Key-length-dependent number of rounds. */
unsigned int decryption_prepared:1; /* The decryption key schedule is available. */
#ifdef USE_PADLOCK
unsigned int use_padlock:1; /* Padlock shall be used. */
#endif /*USE_PADLOCK*/
#ifdef USE_AESNI
unsigned int use_aesni:1; /* AES-NI shall be used. */
#endif /*USE_AESNI*/
rijndael_cryptfn_t encrypt_fn;
rijndael_cryptfn_t decrypt_fn;
rijndael_prefetchfn_t prefetch_enc_fn;
rijndael_prefetchfn_t prefetch_dec_fn;
} RIJNDAEL_context ATTR_ALIGNED_16;
/* Macros defining alias for the keyschedules. */
#define keyschenc u1.keyschedule
#define keyschdec u2.keyschedule
#define padlockkey u1.padlock_key
#endif /* G10_RIJNDAEL_INTERNAL_H */
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