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#ifndef PLATFORM_H |
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#define PLATFORM_H |
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/*************************************************************************** |
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PLATFORM.H -- Platform-specific defines for TWOFISH code |
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Submitters: |
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Bruce Schneier, Counterpane Systems |
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Doug Whiting, Hi/fn |
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John Kelsey, Counterpane Systems |
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Chris Hall, Counterpane Systems |
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David Wagner, UC Berkeley |
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Code Author: Doug Whiting, Hi/fn |
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Version 1.00 April 1998 |
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Copyright 1998, Hi/fn and Counterpane Systems. All rights reserved. |
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Notes: |
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* Tab size is set to 4 characters in this file |
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***************************************************************************/ |
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typedef unsigned char BYTE; |
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typedef U32 DWORD; |
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/* use intrinsic rotate if possible */ |
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#define ROL(x,n) (((x) << ((n) & 0x1F)) | ((x) >> (32-((n) & 0x1F)))) |
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#define ROR(x,n) (((x) >> ((n) & 0x1F)) | ((x) << (32-((n) & 0x1F)))) |
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#if (0) && defined(__BORLANDC__) && (__BORLANDC__ >= 0x462) |
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#error "!!!This does not work for some reason!!!" |
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#include <stdlib.h> /* get prototype for _lrotl() , _lrotr() */ |
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#pragma inline __lrotl__ |
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#pragma inline __lrotr__ |
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#undef ROL /* get rid of inefficient definitions */ |
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#undef ROR |
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#define ROL(x,n) __lrotl__(x,n) /* use compiler intrinsic rotations */ |
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#define ROR(x,n) __lrotr__(x,n) |
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#endif |
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#ifdef _MSC_VER |
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#include <stdlib.h> /* get prototypes for rotation functions */ |
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#undef ROL |
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#undef ROR |
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#pragma intrinsic(_lrotl,_lrotr) /* use intrinsic compiler rotations */ |
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#define ROL(x,n) _lrotl(x,n) |
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#define ROR(x,n) _lrotr(x,n) |
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#endif |
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#ifndef _M_IX86 |
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#ifdef __BORLANDC__ |
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#define _M_IX86 300 /* make sure this is defined for Intel CPUs */ |
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#endif |
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#endif |
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#if defined(_M_IX86) || defined(__i386) |
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#define ALIGN32 0 /* need dword alignment? (no for Pentium) */ |
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#else /* non-Intel platforms */ |
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#define ALIGN32 1 /* (assume need alignment for non-Intel) */ |
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#endif |
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/* BYTEORDER comes from perl's config.h */ |
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#if BYTEORDER == 0x1234 || BYTEORDER == 0x12345678 || defined(__LITTLE_ENDIAN__) |
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#define LittleEndian 1 |
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#define Bswap(x) (x) /* NOP for little-endian machines */ |
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#define ADDR_XOR 0 /* NOP for little-endian machines */ |
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#else |
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#define Bswap(x) ((ROR(x,8) & 0xFF00FF00) | (ROL(x,8) & 0x00FF00FF)) |
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#define ADDR_XOR 3 /* convert byte address in dword */ |
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#endif |
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/* Macros for extracting bytes from dwords (correct for endianness) */ |
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#define _b(x,N) (((BYTE *)&x)[((N) & 3) ^ ADDR_XOR]) /* pick bytes out of a dword */ |
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#define b0(x) _b(x,0) /* extract LSB of DWORD */ |
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#define b1(x) _b(x,1) |
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#define b2(x) _b(x,2) |
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#define b3(x) _b(x,3) /* extract MSB of DWORD */ |
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#endif |
