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gnupg/scripts/conf-w32brg/aesopt.h
Werner Koch a45c9692b2 Importat updated from Brian
2004-07-20 11:48:09 +00:00

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/*
---------------------------------------------------------------------------
Copyright (c) 2003, Dr Brian Gladman, Worcester, UK. All rights reserved.
LICENSE TERMS
The free distribution and use of this software in both source and binary
form is allowed (with or without changes) provided that:
1. distributions of this source code include the above copyright
notice, this list of conditions and the following disclaimer;
2. distributions in binary form include the above copyright
notice, this list of conditions and the following disclaimer
in the documentation and/or other associated materials;
3. the copyright holder's name is not used to endorse products
built using this software without specific written permission.
ALTERNATIVELY, provided that this notice is retained in full, this product
may be distributed under the terms of the GNU General Public License (GPL),
in which case the provisions of the GPL apply INSTEAD OF those given above.
DISCLAIMER
This software is provided 'as is' with no explicit or implied warranties
in respect of its properties, including, but not limited to, correctness
and/or fitness for purpose.
---------------------------------------------------------------------------
Issue 30/06/2004
This file contains the compilation options for AES (Rijndael) and code
that is common across encryption, key scheduling and table generation.
OPERATION
These source code files implement the AES algorithm Rijndael designed by
Joan Daemen and Vincent Rijmen. This version is designed for the standard
block size of 16 bytes and for key sizes of 128, 192 and 256 bits (16, 24
and 32 bytes).
This version is designed for flexibility and speed using operations on
32-bit words rather than operations on bytes. It can be compiled with
either big or little endian internal byte order but is faster when the
native byte order for the processor is used.
THE CIPHER INTERFACE
The cipher interface is implemented as an array of bytes in which lower
AES bit sequence indexes map to higher numeric significance within bytes.
aes_08t (an unsigned 8-bit type)
aes_32t (an unsigned 32-bit type)
struct aes_encrypt_ctx (structure for the cipher encryption context)
struct aes_decrypt_ctx (structure for the cipher decryption context)
aes_rval the function return type
C subroutine calls:
aes_rval aes_encrypt_key128(const unsigned char *key, aes_encrypt_ctx cx[1]);
aes_rval aes_encrypt_key192(const unsigned char *key, aes_encrypt_ctx cx[1]);
aes_rval aes_encrypt_key256(const unsigned char *key, aes_encrypt_ctx cx[1]);
aes_rval aes_encrypt(const unsigned char *in, unsigned char *out,
const aes_encrypt_ctx cx[1]);
aes_rval aes_decrypt_key128(const unsigned char *key, aes_decrypt_ctx cx[1]);
aes_rval aes_decrypt_key192(const unsigned char *key, aes_decrypt_ctx cx[1]);
aes_rval aes_decrypt_key256(const unsigned char *key, aes_decrypt_ctx cx[1]);
aes_rval aes_decrypt(const unsigned char *in, unsigned char *out,
const aes_decrypt_ctx cx[1]);
IMPORTANT NOTE: If you are using this C interface with dynamic tables make sure that
you call genTabs() before AES is used so that the tables are initialised.
C++ aes class subroutines:
Class AESencrypt for encryption
Construtors:
AESencrypt(void)
AESencrypt(const unsigned char *key) - 128 bit key
Members:
aes_rval key128(const unsigned char *key)
aes_rval key192(const unsigned char *key)
aes_rval key256(const unsigned char *key)
aes_rval encrypt(const unsigned char *in, unsigned char *out) const
Class AESdecrypt for encryption
Construtors:
AESdecrypt(void)
AESdecrypt(const unsigned char *key) - 128 bit key
Members:
aes_rval key128(const unsigned char *key)
aes_rval key192(const unsigned char *key)
aes_rval key256(const unsigned char *key)
aes_rval decrypt(const unsigned char *in, unsigned char *out) const
COMPILATION
The files used to provide AES (Rijndael) are
a. aes.h for the definitions needed for use in C.
b. aescpp.h for the definitions needed for use in C++.
c. aesopt.h for setting compilation options (also includes common code).
d. aescrypt.c for encryption and decrytpion, or
e. aeskey.c for key scheduling.
f. aestab.c for table loading or generation.
g. aescrypt.asm for encryption and decryption using assembler code.
h. aescrypt.mmx.asm for encryption and decryption using MMX assembler.
To compile AES (Rijndael) for use in C code use aes.h and set the
defines here for the facilities you need (key lengths, encryption
and/or decryption). Do not define AES_DLL or AES_CPP. Set the options
for optimisations and table sizes here.
To compile AES (Rijndael) for use in in C++ code use aescpp.h but do
not define AES_DLL
To compile AES (Rijndael) in C as a Dynamic Link Library DLL) use
aes.h and include the AES_DLL define.
CONFIGURATION OPTIONS (here and in aes.h)
a. set AES_DLL in aes.h if AES (Rijndael) is to be compiled as a DLL
b. You may need to set PLATFORM_BYTE_ORDER to define the byte order.
c. If you want the code to run in a specific internal byte order, then
ALGORITHM_BYTE_ORDER must be set accordingly.
d. set other configuration options decribed below.
*/
#if !defined( _AESOPT_H )
#define _AESOPT_H
#if defined( __cplusplus ) && defined( AES_CPP )
#include "aescpp.h"
#else
#include "aes.h"
#endif
/* CONFIGURATION - USE OF DEFINES
Later in this section there are a number of defines that control the
operation of the code. In each section, the purpose of each define is
explained so that the relevant form can be included or excluded by
setting either 1's or 0's respectively on the branches of the related
#if clauses.
PLATFORM SPECIFIC INCLUDES AND BYTE ORDER IN 32-BIT WORDS
To obtain the highest speed on processors with 32-bit words, this code
needs to determine the byte order of the target machine. The following
block of code is an attempt to capture the most obvious ways in which
various environemnts define byte order. It may well fail, in which case
the definitions will need to be set by editing at the points marked
**** EDIT HERE IF NECESSARY **** below. My thanks go to Peter Gutmann
for his assistance with this endian detection nightmare.
*/
#define BRG_LITTLE_ENDIAN 1234 /* byte 0 is least significant (i386) */
#define BRG_BIG_ENDIAN 4321 /* byte 0 is most significant (mc68k) */
#if defined(__GNUC__) || defined(__GNU_LIBRARY__)
# if defined(__FreeBSD__) || defined(__OpenBSD__)
# include <sys/endian.h>
# elif defined( BSD ) && ( BSD >= 199103 ) || defined( __DJGPP__ )
# include <machine/endian.h>
# elif defined(__APPLE__)
# if defined(__BIG_ENDIAN__) && !defined( BIG_ENDIAN )
# define BIG_ENDIAN
# elif defined(__LITTLE_ENDIAN__) && !defined( LITTLE_ENDIAN )
# define LITTLE_ENDIAN
# endif
# else
# include <endian.h>
# if !defined(__BEOS__)
# include <byteswap.h>
# endif
# endif
#endif
#if !defined(PLATFORM_BYTE_ORDER)
# if defined(LITTLE_ENDIAN) || defined(BIG_ENDIAN)
# if defined(LITTLE_ENDIAN) && !defined(BIG_ENDIAN)
# define PLATFORM_BYTE_ORDER BRG_LITTLE_ENDIAN
# elif !defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN)
# define PLATFORM_BYTE_ORDER BRG_BIG_ENDIAN
# elif defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
# define PLATFORM_BYTE_ORDER BRG_LITTLE_ENDIAN
# elif defined(BYTE_ORDER) && (BYTE_ORDER == BIG_ENDIAN)
# define PLATFORM_BYTE_ORDER BRG_BIG_ENDIAN
# endif
# elif defined(_LITTLE_ENDIAN) || defined(_BIG_ENDIAN)
# if defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN)
# define PLATFORM_BYTE_ORDER BRG_LITTLE_ENDIAN
# elif !defined(_LITTLE_ENDIAN) && defined(_BIG_ENDIAN)
# define PLATFORM_BYTE_ORDER BRG_BIG_ENDIAN
# elif defined(_BYTE_ORDER) && (_BYTE_ORDER == _LITTLE_ENDIAN)
# define PLATFORM_BYTE_ORDER BRG_LITTLE_ENDIAN
# elif defined(_BYTE_ORDER) && (_BYTE_ORDER == _BIG_ENDIAN)
# define PLATFORM_BYTE_ORDER BRG_BIG_ENDIAN
# endif
# elif defined(__LITTLE_ENDIAN__) || defined(__BIG_ENDIAN__)
# if defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)
# define PLATFORM_BYTE_ORDER BRG_LITTLE_ENDIAN
# elif !defined(__LITTLE_ENDIAN__) && defined(__BIG_ENDIAN__)
# define PLATFORM_BYTE_ORDER BRG_BIG_ENDIAN
# elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __LITTLE_ENDIAN__)
# define PLATFORM_BYTE_ORDER BRG_LITTLE_ENDIAN
# elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __BIG_ENDIAN__)
# define PLATFORM_BYTE_ORDER BRG_BIG_ENDIAN
# endif
# endif
#endif
/* if the platform is still unknown, try to find its byte order */
/* from commonly used machine defines */
#if !defined(PLATFORM_BYTE_ORDER)
#if defined( __alpha__ ) || defined( __alpha ) || defined( i386 ) || \
defined( __i386__ ) || defined( _M_I86 ) || defined( _M_IX86 ) || \
defined( __OS2__ ) || defined( sun386 ) || defined( __TURBOC__ ) || \
defined( vax ) || defined( vms ) || defined( VMS ) || \
defined( __VMS )
# define PLATFORM_BYTE_ORDER BRG_LITTLE_ENDIAN
#elif defined( AMIGA ) || defined( applec ) || defined( __AS400__ ) || \
defined( _CRAY ) || defined( __hppa ) || defined( __hp9000 ) || \
defined( ibm370 ) || defined( mc68000 ) || defined( m68k ) || \
defined( __MRC__ ) || defined( __MVS__ ) || defined( __MWERKS__ ) || \
defined( sparc ) || defined( __sparc) || defined( SYMANTEC_C ) || \
defined( __TANDEM ) || defined( THINK_C ) || defined( __VMCMS__ )
# define PLATFORM_BYTE_ORDER BRG_BIG_ENDIAN
#elif 0 /* **** EDIT HERE IF NECESSARY **** */
# define PLATFORM_BYTE_ORDER BRG_LITTLE_ENDIAN
#elif 0 /* **** EDIT HERE IF NECESSARY **** */
# define PLATFORM_BYTE_ORDER BRG_BIG_ENDIAN
#else
# error Please edit aesopt.h (line 235 or 237) to set the platform byte order
#endif
#endif
/* SOME LOCAL DEFINITIONS */
#define NO_TABLES 0
#define ONE_TABLE 1
#define FOUR_TABLES 4
#define NONE 0
#define PARTIAL 1
#define FULL 2
#if defined(bswap32)
#define aes_sw32 bswap32
#elif defined(bswap_32)
#define aes_sw32 bswap_32
#else
#define brot(x,n) (((aes_32t)(x) << n) | ((aes_32t)(x) >> (32 - n)))
#define aes_sw32(x) ((brot((x),8) & 0x00ff00ff) | (brot((x),24) & 0xff00ff00))
#endif
/* 1. VIA ACE SUPPORT
Define this option if support for the VIA ACE is required. This uses inline
assembler instructions and is only implemented for the Microsoft, Intel and
GCC compilers. If VIA ACE is known to be present, defining VIA_ACE_ONLY as
well as USE_VIA_ACE will then remove the ordinary encryption/decryption code.
If only USE_VIA_ACE is defined, VIA ACE will be used if it is detected (both
present and enabled) but the normal AES code will also be present. When VIA
ACE is to be used, all AES encryption contexts MUST be 16 byte aligned; other
input/output buffers do not need to be 16 byte aligned but there are very
large performance gains if this can be arranged. VIA ACE also requires the
decryption key schedule to be in reverse order (which the following defines
ensure).
*/
#if 0
#define USE_VIA_ACE
#endif
#if 0
#define VIA_ACE_ONLY
#endif
#if !defined( _MSC_VER ) && !defined( __GNUC__ )
# if defined( VIA_ACE_ONLY )
# undef VIA_ACE_ONLY
# endif
# if defined( USE_VIA_ACE )
# undef USE_VIA_ACE
# endif
#endif
#if defined( VIA_ACE_ONLY ) && !defined( USE_VIA_ACE )
#define USE_VIA_ACE
#endif
#if defined( USE_VIA_ACE ) && !defined (AES_REV_DKS)
#define AES_REV_DKS
#endif
/* 2. FUNCTIONS REQUIRED
This implementation provides subroutines for encryption, decryption
and for setting the three key lengths (separately) for encryption
and decryption. When the assembler code is not being used the following
definition blocks allow the selection of the routines that are to be
included in the compilation.
*/
#if defined( AES_ENCRYPT )
#define ENCRYPTION
#define ENCRYPTION_KEY_SCHEDULE
#endif
#if defined( AES_DECRYPT )
#define DECRYPTION
#define DECRYPTION_KEY_SCHEDULE
#endif
#if defined( VIA_ACE_ONLY )
#undef ENCRYPTION
#undef DECRYPTION
#define ENCRYPTION_KEY_SCHEDULE
#define DECRYPTION_KEY_SCHEDULE
#endif
/* 3. ASSEMBLER SUPPORT
This define (which can be on the command line) enables the use of the
assembler code routines for encryption and decryption with the C code
only providing key scheduling
*/
#if 0 && !defined(AES_ASM)
#define AES_ASM
#endif
/* 4. BYTE ORDER WITHIN 32 BIT WORDS
The fundamental data processing units in Rijndael are 8-bit bytes. The
input, output and key input are all enumerated arrays of bytes in which
bytes are numbered starting at zero and increasing to one less than the
number of bytes in the array in question. This enumeration is only used
for naming bytes and does not imply any adjacency or order relationship
from one byte to another. When these inputs and outputs are considered
as bit sequences, bits 8*n to 8*n+7 of the bit sequence are mapped to
byte[n] with bit 8n+i in the sequence mapped to bit 7-i within the byte.
In this implementation bits are numbered from 0 to 7 starting at the
numerically least significant end of each byte (bit n represents 2^n).
However, Rijndael can be implemented more efficiently using 32-bit
words by packing bytes into words so that bytes 4*n to 4*n+3 are placed
into word[n]. While in principle these bytes can be assembled into words
in any positions, this implementation only supports the two formats in
which bytes in adjacent positions within words also have adjacent byte
numbers. This order is called big-endian if the lowest numbered bytes
in words have the highest numeric significance and little-endian if the
opposite applies.
This code can work in either order irrespective of the order used by the
machine on which it runs. Normally the internal byte order will be set
to the order of the processor on which the code is to be run but this
define can be used to reverse this in special situations
NOTE: Assembler code versions rely on PLATFORM_BYTE_ORDER being set
*/
#if 1 || defined(AES_ASM)
#define ALGORITHM_BYTE_ORDER PLATFORM_BYTE_ORDER
#elif 0
#define ALGORITHM_BYTE_ORDER BRG_LITTLE_ENDIAN
#elif 0
#define ALGORITHM_BYTE_ORDER BRG_BIG_ENDIAN
#else
#error The algorithm byte order is not defined
#endif
/* 5. FAST INPUT/OUTPUT OPERATIONS.
On some machines it is possible to improve speed by transferring the
bytes in the input and output arrays to and from the internal 32-bit
variables by addressing these arrays as if they are arrays of 32-bit
words. On some machines this will always be possible but there may
be a large performance penalty if the byte arrays are not aligned on
the normal word boundaries. On other machines this technique will
lead to memory access errors when such 32-bit word accesses are not
properly aligned. The option SAFE_IO avoids such problems but will
often be slower on those machines that support misaligned access
(especially so if care is taken to align the input and output byte
arrays on 32-bit word boundaries). If SAFE_IO is not defined it is
assumed that access to byte arrays as if they are arrays of 32-bit
words will not cause problems when such accesses are misaligned.
*/
#if 1 && !defined(_MSC_VER)
#define SAFE_IO
#endif
/* 6. LOOP UNROLLING
The code for encryption and decrytpion cycles through a number of rounds
that can be implemented either in a loop or by expanding the code into a
long sequence of instructions, the latter producing a larger program but
one that will often be much faster. The latter is called loop unrolling.
There are also potential speed advantages in expanding two iterations in
a loop with half the number of iterations, which is called partial loop
unrolling. The following options allow partial or full loop unrolling
to be set independently for encryption and decryption
*/
#if 1
#define ENC_UNROLL FULL
#elif 0
#define ENC_UNROLL PARTIAL
#else
#define ENC_UNROLL NONE
#endif
#if 1
#define DEC_UNROLL FULL
#elif 0
#define DEC_UNROLL PARTIAL
#else
#define DEC_UNROLL NONE
#endif
/* 7. FAST FINITE FIELD OPERATIONS
If this section is included, tables are used to provide faster finite
field arithmetic (this has no effect if FIXED_TABLES is defined).
*/
#if 1
#define FF_TABLES
#endif
/* 8. INTERNAL STATE VARIABLE FORMAT
The internal state of Rijndael is stored in a number of local 32-bit
word varaibles which can be defined either as an array or as individual
names variables. Include this section if you want to store these local
varaibles in arrays. Otherwise individual local variables will be used.
*/
#if 1
#define ARRAYS
#endif
/* In this implementation the columns of the state array are each held in
32-bit words. The state array can be held in various ways: in an array
of words, in a number of individual word variables or in a number of
processor registers. The following define maps a variable name x and
a column number c to the way the state array variable is to be held.
The first define below maps the state into an array x[c] whereas the
second form maps the state into a number of individual variables x0,
x1, etc. Another form could map individual state colums to machine
register names.
*/
#if defined(ARRAYS)
#define s(x,c) x[c]
#else
#define s(x,c) x##c
#endif
/* 9. FIXED OR DYNAMIC TABLES
When this section is included the tables used by the code are compiled
statically into the binary file. Otherwise the subroutine gen_tabs()
must be called to compute them before the code is first used.
*/
#if 1
#define FIXED_TABLES
#endif
/* 10. TABLE ALIGNMENT
On some sytsems speed will be improved by aligning the AES large lookup
tables on particular boundaries. This define should be set to a power of
two giving the desired alignment. It can be left undefined if alignment
is not needed. This option is specific to the Microsft VC++ compiler -
it seems to sometimes cause trouble for the VC++ version 6 compiler.
*/
#if 0 && defined(_MSC_VER) && (_MSC_VER >= 1300)
#define TABLE_ALIGN 64
#endif
/* 11. INTERNAL TABLE CONFIGURATION
This cipher proceeds by repeating in a number of cycles known as 'rounds'
which are implemented by a round function which can optionally be speeded
up using tables. The basic tables are each 256 32-bit words, with either
one or four tables being required for each round function depending on
how much speed is required. The encryption and decryption round functions
are different and the last encryption and decrytpion round functions are
different again making four different round functions in all.
This means that:
1. Normal encryption and decryption rounds can each use either 0, 1
or 4 tables and table spaces of 0, 1024 or 4096 bytes each.
2. The last encryption and decryption rounds can also use either 0, 1
or 4 tables and table spaces of 0, 1024 or 4096 bytes each.
Include or exclude the appropriate definitions below to set the number
of tables used by this implementation.
*/
#if 1 /* set tables for the normal encryption round */
#define ENC_ROUND FOUR_TABLES
#elif 0
#define ENC_ROUND ONE_TABLE
#else
#define ENC_ROUND NO_TABLES
#endif
#if 1 /* set tables for the last encryption round */
#define LAST_ENC_ROUND FOUR_TABLES
#elif 0
#define LAST_ENC_ROUND ONE_TABLE
#else
#define LAST_ENC_ROUND NO_TABLES
#endif
#if 1 /* set tables for the normal decryption round */
#define DEC_ROUND FOUR_TABLES
#elif 0
#define DEC_ROUND ONE_TABLE
#else
#define DEC_ROUND NO_TABLES
#endif
#if 1 /* set tables for the last decryption round */
#define LAST_DEC_ROUND FOUR_TABLES
#elif 0
#define LAST_DEC_ROUND ONE_TABLE
#else
#define LAST_DEC_ROUND NO_TABLES
#endif
/* The decryption key schedule can be speeded up with tables in the same
way that the round functions can. Include or exclude the following
defines to set this requirement.
*/
#if 1
#define KEY_SCHED FOUR_TABLES
#elif 0
#define KEY_SCHED ONE_TABLE
#else
#define KEY_SCHED NO_TABLES
#endif
/* END OF CONFIGURATION OPTIONS */
#define RC_LENGTH (5 * (AES_BLOCK_SIZE / 4 - 2))
/* Disable or report errors on some combinations of options */
#if ENC_ROUND == NO_TABLES && LAST_ENC_ROUND != NO_TABLES
#undef LAST_ENC_ROUND
#define LAST_ENC_ROUND NO_TABLES
#elif ENC_ROUND == ONE_TABLE && LAST_ENC_ROUND == FOUR_TABLES
#undef LAST_ENC_ROUND
#define LAST_ENC_ROUND ONE_TABLE
#endif
#if ENC_ROUND == NO_TABLES && ENC_UNROLL != NONE
#undef ENC_UNROLL
#define ENC_UNROLL NONE
#endif
#if DEC_ROUND == NO_TABLES && LAST_DEC_ROUND != NO_TABLES
#undef LAST_DEC_ROUND
#define LAST_DEC_ROUND NO_TABLES
#elif DEC_ROUND == ONE_TABLE && LAST_DEC_ROUND == FOUR_TABLES
#undef LAST_DEC_ROUND
#define LAST_DEC_ROUND ONE_TABLE
#endif
#if DEC_ROUND == NO_TABLES && DEC_UNROLL != NONE
#undef DEC_UNROLL
#define DEC_UNROLL NONE
#endif
/* upr(x,n): rotates bytes within words by n positions, moving bytes to
higher index positions with wrap around into low positions
ups(x,n): moves bytes by n positions to higher index positions in
words but without wrap around
bval(x,n): extracts a byte from a word
NOTE: The definitions given here are intended only for use with
unsigned variables and with shift counts that are compile
time constants
*/
#if (ALGORITHM_BYTE_ORDER == BRG_LITTLE_ENDIAN)
#define upr(x,n) (((aes_32t)(x) << (8 * (n))) | ((aes_32t)(x) >> (32 - 8 * (n))))
#define ups(x,n) ((aes_32t) (x) << (8 * (n)))
#define bval(x,n) ((aes_08t)((x) >> (8 * (n))))
#define bytes2word(b0, b1, b2, b3) \
(((aes_32t)(b3) << 24) | ((aes_32t)(b2) << 16) | ((aes_32t)(b1) << 8) | (b0))
#endif
#if (ALGORITHM_BYTE_ORDER == BRG_BIG_ENDIAN)
#define upr(x,n) (((aes_32t)(x) >> (8 * (n))) | ((aes_32t)(x) << (32 - 8 * (n))))
#define ups(x,n) ((aes_32t) (x) >> (8 * (n))))
#define bval(x,n) ((aes_08t)((x) >> (24 - 8 * (n))))
#define bytes2word(b0, b1, b2, b3) \
(((aes_32t)(b0) << 24) | ((aes_32t)(b1) << 16) | ((aes_32t)(b2) << 8) | (b3))
#endif
#if defined(SAFE_IO)
#define word_in(x,c) bytes2word(((const aes_08t*)(x)+4*c)[0], ((const aes_08t*)(x)+4*c)[1], \
((const aes_08t*)(x)+4*c)[2], ((const aes_08t*)(x)+4*c)[3])
#define word_out(x,c,v) { ((aes_08t*)(x)+4*c)[0] = bval(v,0); ((aes_08t*)(x)+4*c)[1] = bval(v,1); \
((aes_08t*)(x)+4*c)[2] = bval(v,2); ((aes_08t*)(x)+4*c)[3] = bval(v,3); }
#elif (ALGORITHM_BYTE_ORDER == PLATFORM_BYTE_ORDER)
#define word_in(x,c) (*((aes_32t*)(x)+(c)))
#define word_out(x,c,v) (*((aes_32t*)(x)+(c)) = (v))
#else
#define word_in(x,c) aes_sw32(*((aes_32t*)(x)+(c)))
#define word_out(x,c,v) (*((aes_32t*)(x)+(c)) = aes_sw32(v))
#endif
/* the finite field modular polynomial and elements */
#define WPOLY 0x011b
#define BPOLY 0x1b
/* multiply four bytes in GF(2^8) by 'x' {02} in parallel */
#define m1 0x80808080
#define m2 0x7f7f7f7f
#define gf_mulx(x) ((((x) & m2) << 1) ^ ((((x) & m1) >> 7) * BPOLY))
/* The following defines provide alternative definitions of gf_mulx that might
give improved performance if a fast 32-bit multiply is not available. Note
that a temporary variable u needs to be defined where gf_mulx is used.
#define gf_mulx(x) (u = (x) & m1, u |= (u >> 1), ((x) & m2) << 1) ^ ((u >> 3) | (u >> 6))
#define m4 (0x01010101 * BPOLY)
#define gf_mulx(x) (u = (x) & m1, ((x) & m2) << 1) ^ ((u - (u >> 7)) & m4)
*/
/* Work out which tables are needed for the different options */
#if defined( AES_ASM )
#if defined( ENC_ROUND )
#undef ENC_ROUND
#endif
#define ENC_ROUND FOUR_TABLES
#if defined( LAST_ENC_ROUND )
#undef LAST_ENC_ROUND
#endif
#define LAST_ENC_ROUND FOUR_TABLES
#if defined( DEC_ROUND )
#undef DEC_ROUND
#endif
#define DEC_ROUND FOUR_TABLES
#if defined( LAST_DEC_ROUND )
#undef LAST_DEC_ROUND
#endif
#define LAST_DEC_ROUND FOUR_TABLES
#if defined( KEY_SCHED )
#undef KEY_SCHED
#define KEY_SCHED FOUR_TABLES
#endif
#endif
#if defined(ENCRYPTION) || defined(AES_ASM)
#if ENC_ROUND == ONE_TABLE
#define FT1_SET
#elif ENC_ROUND == FOUR_TABLES
#define FT4_SET
#else
#define SBX_SET
#endif
#if LAST_ENC_ROUND == ONE_TABLE
#define FL1_SET
#elif LAST_ENC_ROUND == FOUR_TABLES
#define FL4_SET
#elif !defined(SBX_SET)
#define SBX_SET
#endif
#endif
#if defined(DECRYPTION) || defined(AES_ASM)
#if DEC_ROUND == ONE_TABLE
#define IT1_SET
#elif DEC_ROUND == FOUR_TABLES
#define IT4_SET
#else
#define ISB_SET
#endif
#if LAST_DEC_ROUND == ONE_TABLE
#define IL1_SET
#elif LAST_DEC_ROUND == FOUR_TABLES
#define IL4_SET
#elif !defined(ISB_SET)
#define ISB_SET
#endif
#endif
#if defined(ENCRYPTION_KEY_SCHEDULE) || defined(DECRYPTION_KEY_SCHEDULE)
#if KEY_SCHED == ONE_TABLE
#define LS1_SET
#define IM1_SET
#elif KEY_SCHED == FOUR_TABLES
#define LS4_SET
#define IM4_SET
#elif !defined(SBX_SET)
#define SBX_SET
#endif
#endif
/* generic definitions of Rijndael macros that use tables */
#define no_table(x,box,vf,rf,c) bytes2word( \
box[bval(vf(x,0,c),rf(0,c))], \
box[bval(vf(x,1,c),rf(1,c))], \
box[bval(vf(x,2,c),rf(2,c))], \
box[bval(vf(x,3,c),rf(3,c))])
#define one_table(x,op,tab,vf,rf,c) \
( tab[bval(vf(x,0,c),rf(0,c))] \
^ op(tab[bval(vf(x,1,c),rf(1,c))],1) \
^ op(tab[bval(vf(x,2,c),rf(2,c))],2) \
^ op(tab[bval(vf(x,3,c),rf(3,c))],3))
#define four_tables(x,tab,vf,rf,c) \
( tab[0][bval(vf(x,0,c),rf(0,c))] \
^ tab[1][bval(vf(x,1,c),rf(1,c))] \
^ tab[2][bval(vf(x,2,c),rf(2,c))] \
^ tab[3][bval(vf(x,3,c),rf(3,c))])
#define vf1(x,r,c) (x)
#define rf1(r,c) (r)
#define rf2(r,c) ((8+r-c)&3)
/* perform forward and inverse column mix operation on four bytes in long word x in */
/* parallel. NOTE: x must be a simple variable, NOT an expression in these macros. */
#if defined(FM4_SET) /* not currently used */
#define fwd_mcol(x) four_tables(x,t_use(f,m),vf1,rf1,0)
#elif defined(FM1_SET) /* not currently used */
#define fwd_mcol(x) one_table(x,upr,t_use(f,m),vf1,rf1,0)
#else
#define dec_fmvars aes_32t g2
#define fwd_mcol(x) (g2 = gf_mulx(x), g2 ^ upr((x) ^ g2, 3) ^ upr((x), 2) ^ upr((x), 1))
#endif
#if defined(IM4_SET)
#define inv_mcol(x) four_tables(x,t_use(i,m),vf1,rf1,0)
#elif defined(IM1_SET)
#define inv_mcol(x) one_table(x,upr,t_use(i,m),vf1,rf1,0)
#else
#define dec_imvars aes_32t g2, g4, g9
#define inv_mcol(x) (g2 = gf_mulx(x), g4 = gf_mulx(g2), g9 = (x) ^ gf_mulx(g4), g4 ^= g9, \
(x) ^ g2 ^ g4 ^ upr(g2 ^ g9, 3) ^ upr(g4, 2) ^ upr(g9, 1))
#endif
#if defined(FL4_SET)
#define ls_box(x,c) four_tables(x,t_use(f,l),vf1,rf2,c)
#elif defined(LS4_SET)
#define ls_box(x,c) four_tables(x,t_use(l,s),vf1,rf2,c)
#elif defined(FL1_SET)
#define ls_box(x,c) one_table(x,upr,t_use(f,l),vf1,rf2,c)
#elif defined(LS1_SET)
#define ls_box(x,c) one_table(x,upr,t_use(l,s),vf1,rf2,c)
#else
#define ls_box(x,c) no_table(x,t_use(s,box),vf1,rf2,c)
#endif
#endif
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