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776 lines
27 KiB
776 lines
27 KiB
/* |
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--------------------------------------------------------------------------- |
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Copyright (c) 1998-2013, Brian Gladman, Worcester, UK. All rights reserved. |
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The redistribution and use of this software (with or without changes) |
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is allowed without the payment of fees or royalties provided that: |
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source code distributions include the above copyright notice, this |
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list of conditions and the following disclaimer; |
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binary distributions include the above copyright notice, this list |
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of conditions and the following disclaimer in their documentation. |
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This software is provided 'as is' with no explicit or implied warranties |
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in respect of its operation, including, but not limited to, correctness |
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and fitness for purpose. |
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--------------------------------------------------------------------------- |
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Issue Date: 20/12/2007 |
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This file contains the compilation options for AES (Rijndael) and code |
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that is common across encryption, key scheduling and table generation. |
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OPERATION |
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These source code files implement the AES algorithm Rijndael designed by |
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Joan Daemen and Vincent Rijmen. This version is designed for the standard |
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block size of 16 bytes and for key sizes of 128, 192 and 256 bits (16, 24 |
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and 32 bytes). |
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This version is designed for flexibility and speed using operations on |
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32-bit words rather than operations on bytes. It can be compiled with |
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either big or little endian internal byte order but is faster when the |
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native byte order for the processor is used. |
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THE CIPHER INTERFACE |
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The cipher interface is implemented as an array of bytes in which lower |
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AES bit sequence indexes map to higher numeric significance within bytes. |
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uint8_t (an unsigned 8-bit type) |
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uint32_t (an unsigned 32-bit type) |
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struct aes_encrypt_ctx (structure for the cipher encryption context) |
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struct aes_decrypt_ctx (structure for the cipher decryption context) |
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AES_RETURN the function return type |
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C subroutine calls: |
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AES_RETURN aes_encrypt_key128(const unsigned char *key, aes_encrypt_ctx cx[1]); |
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AES_RETURN aes_encrypt_key192(const unsigned char *key, aes_encrypt_ctx cx[1]); |
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AES_RETURN aes_encrypt_key256(const unsigned char *key, aes_encrypt_ctx cx[1]); |
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AES_RETURN aes_encrypt(const unsigned char *in, unsigned char *out, |
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const aes_encrypt_ctx cx[1]); |
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AES_RETURN aes_decrypt_key128(const unsigned char *key, aes_decrypt_ctx cx[1]); |
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AES_RETURN aes_decrypt_key192(const unsigned char *key, aes_decrypt_ctx cx[1]); |
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AES_RETURN aes_decrypt_key256(const unsigned char *key, aes_decrypt_ctx cx[1]); |
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AES_RETURN aes_decrypt(const unsigned char *in, unsigned char *out, |
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const aes_decrypt_ctx cx[1]); |
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IMPORTANT NOTE: If you are using this C interface with dynamic tables make sure that |
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you call aes_init() before AES is used so that the tables are initialised. |
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C++ aes class subroutines: |
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Class AESencrypt for encryption |
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Construtors: |
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AESencrypt(void) |
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AESencrypt(const unsigned char *key) - 128 bit key |
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Members: |
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AES_RETURN key128(const unsigned char *key) |
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AES_RETURN key192(const unsigned char *key) |
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AES_RETURN key256(const unsigned char *key) |
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AES_RETURN encrypt(const unsigned char *in, unsigned char *out) const |
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Class AESdecrypt for encryption |
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Construtors: |
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AESdecrypt(void) |
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AESdecrypt(const unsigned char *key) - 128 bit key |
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Members: |
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AES_RETURN key128(const unsigned char *key) |
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AES_RETURN key192(const unsigned char *key) |
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AES_RETURN key256(const unsigned char *key) |
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AES_RETURN decrypt(const unsigned char *in, unsigned char *out) const |
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*/ |
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#if !defined( _AESOPT_H ) |
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#define _AESOPT_H |
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#if defined( __cplusplus ) |
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#include "aescpp.h" |
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#else |
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#include "aes.h" |
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#endif |
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/* PLATFORM SPECIFIC INCLUDES */ |
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#include "brg_endian.h" |
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/* CONFIGURATION - THE USE OF DEFINES |
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Later in this section there are a number of defines that control the |
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operation of the code. In each section, the purpose of each define is |
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explained so that the relevant form can be included or excluded by |
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setting either 1's or 0's respectively on the branches of the related |
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#if clauses. The following local defines should not be changed. |
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*/ |
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#define ENCRYPTION_IN_C 1 |
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#define DECRYPTION_IN_C 2 |
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#define ENC_KEYING_IN_C 4 |
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#define DEC_KEYING_IN_C 8 |
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#define NO_TABLES 0 |
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#define ONE_TABLE 1 |
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#define FOUR_TABLES 4 |
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#define NONE 0 |
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#define PARTIAL 1 |
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#define FULL 2 |
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/* --- START OF USER CONFIGURED OPTIONS --- */ |
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/* 1. BYTE ORDER WITHIN 32 BIT WORDS |
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The fundamental data processing units in Rijndael are 8-bit bytes. The |
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input, output and key input are all enumerated arrays of bytes in which |
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bytes are numbered starting at zero and increasing to one less than the |
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number of bytes in the array in question. This enumeration is only used |
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for naming bytes and does not imply any adjacency or order relationship |
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from one byte to another. When these inputs and outputs are considered |
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as bit sequences, bits 8*n to 8*n+7 of the bit sequence are mapped to |
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byte[n] with bit 8n+i in the sequence mapped to bit 7-i within the byte. |
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In this implementation bits are numbered from 0 to 7 starting at the |
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numerically least significant end of each byte (bit n represents 2^n). |
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However, Rijndael can be implemented more efficiently using 32-bit |
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words by packing bytes into words so that bytes 4*n to 4*n+3 are placed |
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into word[n]. While in principle these bytes can be assembled into words |
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in any positions, this implementation only supports the two formats in |
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which bytes in adjacent positions within words also have adjacent byte |
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numbers. This order is called big-endian if the lowest numbered bytes |
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in words have the highest numeric significance and little-endian if the |
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opposite applies. |
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This code can work in either order irrespective of the order used by the |
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machine on which it runs. Normally the internal byte order will be set |
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to the order of the processor on which the code is to be run but this |
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define can be used to reverse this in special situations |
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WARNING: Assembler code versions rely on PLATFORM_BYTE_ORDER being set. |
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This define will hence be redefined later (in section 4) if necessary |
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*/ |
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#if 1 |
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# define ALGORITHM_BYTE_ORDER PLATFORM_BYTE_ORDER |
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#elif 0 |
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# define ALGORITHM_BYTE_ORDER IS_LITTLE_ENDIAN |
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#elif 0 |
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# define ALGORITHM_BYTE_ORDER IS_BIG_ENDIAN |
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#else |
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# error The algorithm byte order is not defined |
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#endif |
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/* 2. Intel AES AND VIA ACE SUPPORT */ |
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#if defined( __GNUC__ ) && defined( __i386__ ) \ |
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|| defined( _WIN32 ) && defined( _M_IX86 ) && !(defined( _WIN64 ) \ |
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|| defined( _WIN32_WCE ) || defined( _MSC_VER ) && ( _MSC_VER <= 800 )) |
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# define VIA_ACE_POSSIBLE |
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#endif |
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#if (defined( _WIN64 ) && defined( _MSC_VER )) \ |
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|| (defined( __GNUC__ ) && defined( __x86_64__ )) && !(defined( __APPLE__ ))\ |
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&& !(defined( INTEL_AES_POSSIBLE )) |
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# define INTEL_AES_POSSIBLE |
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#endif |
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/* Define this option if support for the Intel AESNI is required |
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If USE_INTEL_AES_IF_PRESENT is defined then AESNI will be used |
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if it is detected (both present and enabled). |
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AESNI uses a decryption key schedule with the first decryption |
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round key at the high end of the key scedule with the following |
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round keys at lower positions in memory. So AES_REV_DKS must NOT |
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be defined when AESNI will be used. ALthough it is unlikely that |
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assembler code will be used with an AESNI build, if it is then |
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AES_REV_DKS must NOT be defined when the assembler files are |
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built |
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*/ |
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#if 0 && defined( INTEL_AES_POSSIBLE ) && !defined( USE_INTEL_AES_IF_PRESENT ) |
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# define USE_INTEL_AES_IF_PRESENT |
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#endif |
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/* Define this option if support for the VIA ACE is required. This uses |
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inline assembler instructions and is only implemented for the Microsoft, |
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Intel and GCC compilers. If VIA ACE is known to be present, then defining |
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ASSUME_VIA_ACE_PRESENT will remove the ordinary encryption/decryption |
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code. If USE_VIA_ACE_IF_PRESENT is defined then VIA ACE will be used if |
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it is detected (both present and enabled) but the normal AES code will |
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also be present. |
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When VIA ACE is to be used, all AES encryption contexts MUST be 16 byte |
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aligned; other input/output buffers do not need to be 16 byte aligned |
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but there are very large performance gains if this can be arranged. |
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VIA ACE also requires the decryption key schedule to be in reverse |
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order (which later checks below ensure). |
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AES_REV_DKS must be set for assembler code used with a VIA ACE build |
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*/ |
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#if 0 && defined( VIA_ACE_POSSIBLE ) && !defined( USE_VIA_ACE_IF_PRESENT ) |
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# define USE_VIA_ACE_IF_PRESENT |
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#endif |
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#if 0 && defined( VIA_ACE_POSSIBLE ) && !defined( ASSUME_VIA_ACE_PRESENT ) |
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# define ASSUME_VIA_ACE_PRESENT |
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# endif |
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/* 3. ASSEMBLER SUPPORT |
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This define (which can be on the command line) enables the use of the |
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assembler code routines for encryption, decryption and key scheduling |
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as follows: |
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ASM_X86_V1C uses the assembler (aes_x86_v1.asm) with large tables for |
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encryption and decryption and but with key scheduling in C |
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ASM_X86_V2 uses assembler (aes_x86_v2.asm) with compressed tables for |
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encryption, decryption and key scheduling |
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ASM_X86_V2C uses assembler (aes_x86_v2.asm) with compressed tables for |
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encryption and decryption and but with key scheduling in C |
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ASM_AMD64_C uses assembler (aes_amd64.asm) with compressed tables for |
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encryption and decryption and but with key scheduling in C |
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Change one 'if 0' below to 'if 1' to select the version or define |
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as a compilation option. |
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*/ |
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#if 0 && !defined( ASM_X86_V1C ) |
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# define ASM_X86_V1C |
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#elif 0 && !defined( ASM_X86_V2 ) |
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# define ASM_X86_V2 |
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#elif 0 && !defined( ASM_X86_V2C ) |
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# define ASM_X86_V2C |
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#elif 0 && !defined( ASM_AMD64_C ) |
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# define ASM_AMD64_C |
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#endif |
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#if defined( __i386 ) || defined( _M_IX86 ) |
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# define A32_ |
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#elif defined( __x86_64__ ) || defined( _M_X64 ) |
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# define A64_ |
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#endif |
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#if (defined ( ASM_X86_V1C ) || defined( ASM_X86_V2 ) || defined( ASM_X86_V2C )) \ |
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&& !defined( A32_ ) || defined( ASM_AMD64_C ) && !defined( A64_ ) |
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# error Assembler code is only available for x86 and AMD64 systems |
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#endif |
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/* 4. FAST INPUT/OUTPUT OPERATIONS. |
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On some machines it is possible to improve speed by transferring the |
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bytes in the input and output arrays to and from the internal 32-bit |
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variables by addressing these arrays as if they are arrays of 32-bit |
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words. On some machines this will always be possible but there may |
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be a large performance penalty if the byte arrays are not aligned on |
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the normal word boundaries. On other machines this technique will |
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lead to memory access errors when such 32-bit word accesses are not |
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properly aligned. The option SAFE_IO avoids such problems but will |
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often be slower on those machines that support misaligned access |
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(especially so if care is taken to align the input and output byte |
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arrays on 32-bit word boundaries). If SAFE_IO is not defined it is |
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assumed that access to byte arrays as if they are arrays of 32-bit |
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words will not cause problems when such accesses are misaligned. |
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*/ |
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#if 1 && !defined( _MSC_VER ) |
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# define SAFE_IO |
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#endif |
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/* 5. LOOP UNROLLING |
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The code for encryption and decrytpion cycles through a number of rounds |
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that can be implemented either in a loop or by expanding the code into a |
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long sequence of instructions, the latter producing a larger program but |
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one that will often be much faster. The latter is called loop unrolling. |
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There are also potential speed advantages in expanding two iterations in |
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a loop with half the number of iterations, which is called partial loop |
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unrolling. The following options allow partial or full loop unrolling |
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to be set independently for encryption and decryption |
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*/ |
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#if 1 |
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# define ENC_UNROLL FULL |
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#elif 0 |
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# define ENC_UNROLL PARTIAL |
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#else |
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# define ENC_UNROLL NONE |
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#endif |
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#if 1 |
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# define DEC_UNROLL FULL |
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#elif 0 |
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# define DEC_UNROLL PARTIAL |
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#else |
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# define DEC_UNROLL NONE |
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#endif |
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#if 1 |
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# define ENC_KS_UNROLL |
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#endif |
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#if 1 |
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# define DEC_KS_UNROLL |
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#endif |
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/* 6. FAST FINITE FIELD OPERATIONS |
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If this section is included, tables are used to provide faster finite |
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field arithmetic (this has no effect if STATIC_TABLES is defined). |
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*/ |
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#if 1 |
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# define FF_TABLES |
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#endif |
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/* 7. INTERNAL STATE VARIABLE FORMAT |
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The internal state of Rijndael is stored in a number of local 32-bit |
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word varaibles which can be defined either as an array or as individual |
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names variables. Include this section if you want to store these local |
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varaibles in arrays. Otherwise individual local variables will be used. |
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*/ |
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#if 1 |
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# define ARRAYS |
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#endif |
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/* 8. FIXED OR DYNAMIC TABLES |
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When this section is included the tables used by the code are compiled |
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statically into the binary file. Otherwise the subroutine aes_init() |
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must be called to compute them before the code is first used. |
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*/ |
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#if 1 && !(defined( _MSC_VER ) && ( _MSC_VER <= 800 )) |
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# define STATIC_TABLES |
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#endif |
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/* 9. MASKING OR CASTING FROM LONGER VALUES TO BYTES |
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In some systems it is better to mask longer values to extract bytes |
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rather than using a cast. This option allows this choice. |
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*/ |
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#if 0 |
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# define to_byte(x) ((uint8_t)(x)) |
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#else |
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# define to_byte(x) ((x) & 0xff) |
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#endif |
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/* 10. TABLE ALIGNMENT |
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On some sytsems speed will be improved by aligning the AES large lookup |
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tables on particular boundaries. This define should be set to a power of |
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two giving the desired alignment. It can be left undefined if alignment |
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is not needed. This option is specific to the Microsft VC++ compiler - |
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it seems to sometimes cause trouble for the VC++ version 6 compiler. |
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*/ |
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#if 1 && defined( _MSC_VER ) && ( _MSC_VER >= 1300 ) |
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# define TABLE_ALIGN 32 |
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#endif |
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/* 11. REDUCE CODE AND TABLE SIZE |
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This replaces some expanded macros with function calls if AES_ASM_V2 or |
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AES_ASM_V2C are defined |
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*/ |
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#if 1 && (defined( ASM_X86_V2 ) || defined( ASM_X86_V2C )) |
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# define REDUCE_CODE_SIZE |
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#endif |
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/* 12. TABLE OPTIONS |
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This cipher proceeds by repeating in a number of cycles known as 'rounds' |
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which are implemented by a round function which can optionally be speeded |
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up using tables. The basic tables are each 256 32-bit words, with either |
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one or four tables being required for each round function depending on |
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how much speed is required. The encryption and decryption round functions |
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are different and the last encryption and decrytpion round functions are |
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different again making four different round functions in all. |
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This means that: |
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1. Normal encryption and decryption rounds can each use either 0, 1 |
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or 4 tables and table spaces of 0, 1024 or 4096 bytes each. |
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2. The last encryption and decryption rounds can also use either 0, 1 |
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or 4 tables and table spaces of 0, 1024 or 4096 bytes each. |
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Include or exclude the appropriate definitions below to set the number |
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of tables used by this implementation. |
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*/ |
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#if 1 /* set tables for the normal encryption round */ |
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# define ENC_ROUND FOUR_TABLES |
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#elif 0 |
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# define ENC_ROUND ONE_TABLE |
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#else |
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# define ENC_ROUND NO_TABLES |
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#endif |
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#if 1 /* set tables for the last encryption round */ |
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# define LAST_ENC_ROUND FOUR_TABLES |
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#elif 0 |
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# define LAST_ENC_ROUND ONE_TABLE |
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#else |
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# define LAST_ENC_ROUND NO_TABLES |
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#endif |
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#if 1 /* set tables for the normal decryption round */ |
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# define DEC_ROUND FOUR_TABLES |
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#elif 0 |
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# define DEC_ROUND ONE_TABLE |
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#else |
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# define DEC_ROUND NO_TABLES |
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#endif |
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#if 1 /* set tables for the last decryption round */ |
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# define LAST_DEC_ROUND FOUR_TABLES |
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#elif 0 |
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# define LAST_DEC_ROUND ONE_TABLE |
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#else |
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# define LAST_DEC_ROUND NO_TABLES |
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#endif |
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/* The decryption key schedule can be speeded up with tables in the same |
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way that the round functions can. Include or exclude the following |
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defines to set this requirement. |
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*/ |
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#if 1 |
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# define KEY_SCHED FOUR_TABLES |
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#elif 0 |
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# define KEY_SCHED ONE_TABLE |
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#else |
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# define KEY_SCHED NO_TABLES |
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#endif |
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/* ---- END OF USER CONFIGURED OPTIONS ---- */ |
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/* VIA ACE support is only available for VC++ and GCC */ |
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#if !defined( _MSC_VER ) && !defined( __GNUC__ ) |
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# if defined( ASSUME_VIA_ACE_PRESENT ) |
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# undef ASSUME_VIA_ACE_PRESENT |
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# endif |
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# if defined( USE_VIA_ACE_IF_PRESENT ) |
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# undef USE_VIA_ACE_IF_PRESENT |
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# endif |
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#endif |
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#if defined( ASSUME_VIA_ACE_PRESENT ) && !defined( USE_VIA_ACE_IF_PRESENT ) |
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# define USE_VIA_ACE_IF_PRESENT |
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#endif |
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/* define to reverse decryption key schedule */ |
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#if 1 || defined( USE_VIA_ACE_IF_PRESENT ) && !defined ( AES_REV_DKS ) |
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# define AES_REV_DKS |
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#endif |
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/* Intel AESNI uses a decryption key schedule in the encryption order */ |
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#if defined( USE_INTEL_AES_IF_PRESENT ) && defined ( AES_REV_DKS ) |
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# undef AES_REV_DKS |
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#endif |
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/* Assembler support requires the use of platform byte order */ |
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#if ( defined( ASM_X86_V1C ) || defined( ASM_X86_V2C ) || defined( ASM_AMD64_C ) ) \ |
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&& (ALGORITHM_BYTE_ORDER != PLATFORM_BYTE_ORDER) |
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# undef ALGORITHM_BYTE_ORDER |
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# define ALGORITHM_BYTE_ORDER PLATFORM_BYTE_ORDER |
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#endif |
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/* In this implementation the columns of the state array are each held in |
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32-bit words. The state array can be held in various ways: in an array |
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of words, in a number of individual word variables or in a number of |
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processor registers. The following define maps a variable name x and |
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a column number c to the way the state array variable is to be held. |
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The first define below maps the state into an array x[c] whereas the |
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second form maps the state into a number of individual variables x0, |
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x1, etc. Another form could map individual state colums to machine |
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register names. |
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*/ |
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#if defined( ARRAYS ) |
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# define s(x,c) x[c] |
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#else |
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# define s(x,c) x##c |
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#endif |
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/* This implementation provides subroutines for encryption, decryption |
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and for setting the three key lengths (separately) for encryption |
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and decryption. Since not all functions are needed, masks are set |
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up here to determine which will be implemented in C |
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*/ |
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#if !defined( AES_ENCRYPT ) |
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# define EFUNCS_IN_C 0 |
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#elif defined( ASSUME_VIA_ACE_PRESENT ) || defined( ASM_X86_V1C ) \ |
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|| defined( ASM_X86_V2C ) || defined( ASM_AMD64_C ) |
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# define EFUNCS_IN_C ENC_KEYING_IN_C |
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#elif !defined( ASM_X86_V2 ) |
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# define EFUNCS_IN_C ( ENCRYPTION_IN_C | ENC_KEYING_IN_C ) |
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#else |
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# define EFUNCS_IN_C 0 |
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#endif |
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#if !defined( AES_DECRYPT ) |
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# define DFUNCS_IN_C 0 |
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#elif defined( ASSUME_VIA_ACE_PRESENT ) || defined( ASM_X86_V1C ) \ |
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|| defined( ASM_X86_V2C ) || defined( ASM_AMD64_C ) |
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# define DFUNCS_IN_C DEC_KEYING_IN_C |
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#elif !defined( ASM_X86_V2 ) |
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# define DFUNCS_IN_C ( DECRYPTION_IN_C | DEC_KEYING_IN_C ) |
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#else |
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# define DFUNCS_IN_C 0 |
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#endif |
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#define FUNCS_IN_C ( EFUNCS_IN_C | DFUNCS_IN_C ) |
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/* END OF CONFIGURATION OPTIONS */ |
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#define RC_LENGTH (5 * (AES_BLOCK_SIZE / 4 - 2)) |
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|
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/* Disable or report errors on some combinations of options */ |
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|
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#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 |
|
|
|
#if defined( bswap32 ) |
|
# define aes_sw32 bswap32 |
|
#elif defined( bswap_32 ) |
|
# define aes_sw32 bswap_32 |
|
#else |
|
# define brot(x,n) (((uint32_t)(x) << n) | ((uint32_t)(x) >> (32 - n))) |
|
# define aes_sw32(x) ((brot((x),8) & 0x00ff00ff) | (brot((x),24) & 0xff00ff00)) |
|
#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 |
|
|
|
WARNING: 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 == IS_LITTLE_ENDIAN ) |
|
# define upr(x,n) (((uint32_t)(x) << (8 * (n))) | ((uint32_t)(x) >> (32 - 8 * (n)))) |
|
# define ups(x,n) ((uint32_t) (x) << (8 * (n))) |
|
# define bval(x,n) to_byte((x) >> (8 * (n))) |
|
# define bytes2word(b0, b1, b2, b3) \ |
|
(((uint32_t)(b3) << 24) | ((uint32_t)(b2) << 16) | ((uint32_t)(b1) << 8) | (b0)) |
|
#endif |
|
|
|
#if ( ALGORITHM_BYTE_ORDER == IS_BIG_ENDIAN ) |
|
# define upr(x,n) (((uint32_t)(x) >> (8 * (n))) | ((uint32_t)(x) << (32 - 8 * (n)))) |
|
# define ups(x,n) ((uint32_t) (x) >> (8 * (n))) |
|
# define bval(x,n) to_byte((x) >> (24 - 8 * (n))) |
|
# define bytes2word(b0, b1, b2, b3) \ |
|
(((uint32_t)(b0) << 24) | ((uint32_t)(b1) << 16) | ((uint32_t)(b2) << 8) | (b3)) |
|
#endif |
|
|
|
#if defined( SAFE_IO ) |
|
# define word_in(x,c) bytes2word(((const uint8_t*)(x)+4*c)[0], ((const uint8_t*)(x)+4*c)[1], \ |
|
((const uint8_t*)(x)+4*c)[2], ((const uint8_t*)(x)+4*c)[3]) |
|
# define word_out(x,c,v) { ((uint8_t*)(x)+4*c)[0] = bval(v,0); ((uint8_t*)(x)+4*c)[1] = bval(v,1); \ |
|
((uint8_t*)(x)+4*c)[2] = bval(v,2); ((uint8_t*)(x)+4*c)[3] = bval(v,3); } |
|
#elif ( ALGORITHM_BYTE_ORDER == PLATFORM_BYTE_ORDER ) |
|
# define word_in(x,c) (*((uint32_t*)(x)+(c))) |
|
# define word_out(x,c,v) (*((uint32_t*)(x)+(c)) = (v)) |
|
#else |
|
# define word_in(x,c) aes_sw32(*((uint32_t*)(x)+(c))) |
|
# define word_out(x,c,v) (*((uint32_t*)(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 gf_c1 0x80808080 |
|
#define gf_c2 0x7f7f7f7f |
|
#define gf_mulx(x) ((((x) & gf_c2) << 1) ^ ((((x) & gf_c1) >> 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) & gf_c1, u |= (u >> 1), ((x) & gf_c2) << 1) ^ ((u >> 3) | (u >> 6)) |
|
#define gf_c4 (0x01010101 * BPOLY) |
|
#define gf_mulx(x) (u = (x) & gf_c1, ((x) & gf_c2) << 1) ^ ((u - (u >> 7)) & gf_c4) |
|
*/ |
|
|
|
/* Work out which tables are needed for the different options */ |
|
|
|
#if defined( ASM_X86_V1C ) |
|
# 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 ( FUNCS_IN_C & ENCRYPTION_IN_C ) || defined( ASM_X86_V1C ) |
|
# 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 ( FUNCS_IN_C & DECRYPTION_IN_C ) || defined( ASM_X86_V1C ) |
|
# 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( REDUCE_CODE_SIZE ) && (defined( ASM_X86_V2 ) || defined( ASM_X86_V2C ))) |
|
# if ((FUNCS_IN_C & ENC_KEYING_IN_C) || (FUNCS_IN_C & DEC_KEYING_IN_C)) |
|
# if KEY_SCHED == ONE_TABLE |
|
# if !defined( FL1_SET ) && !defined( FL4_SET ) |
|
# define LS1_SET |
|
# endif |
|
# elif KEY_SCHED == FOUR_TABLES |
|
# if !defined( FL4_SET ) |
|
# define LS4_SET |
|
# endif |
|
# elif !defined( SBX_SET ) |
|
# define SBX_SET |
|
# endif |
|
# endif |
|
# if (FUNCS_IN_C & DEC_KEYING_IN_C) |
|
# if KEY_SCHED == ONE_TABLE |
|
# define IM1_SET |
|
# elif KEY_SCHED == FOUR_TABLES |
|
# define IM4_SET |
|
# elif !defined( SBX_SET ) |
|
# define SBX_SET |
|
# endif |
|
# 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( REDUCE_CODE_SIZE ) && (defined( ASM_X86_V2 ) || defined( ASM_X86_V2C ))) |
|
|
|
#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 uint32_t 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 uint32_t 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 |
|
|
|
#if defined( ASM_X86_V1C ) && defined( AES_DECRYPT ) && !defined( ISB_SET ) |
|
# define ISB_SET |
|
#endif |
|
|
|
#endif
|
|
|