180 lines
6.0 KiB
C
180 lines
6.0 KiB
C
#ifndef _SKEIN_PORT_H_
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#define _SKEIN_PORT_H_
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#include <limits.h>
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#include <stdint.h>
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#include <stddef.h>
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#ifndef RETURN_VALUES
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# define RETURN_VALUES
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# if defined( DLL_EXPORT )
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# if defined( _MSC_VER ) || defined ( __INTEL_COMPILER )
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# define VOID_RETURN __declspec( dllexport ) void __stdcall
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# define INT_RETURN __declspec( dllexport ) int __stdcall
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# elif defined( __GNUC__ )
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# define VOID_RETURN __declspec( __dllexport__ ) void
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# define INT_RETURN __declspec( __dllexport__ ) int
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# else
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# error Use of the DLL is only available on the Microsoft, Intel and GCC compilers
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# endif
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# elif defined( DLL_IMPORT )
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# if defined( _MSC_VER ) || defined ( __INTEL_COMPILER )
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# define VOID_RETURN __declspec( dllimport ) void __stdcall
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# define INT_RETURN __declspec( dllimport ) int __stdcall
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# elif defined( __GNUC__ )
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# define VOID_RETURN __declspec( __dllimport__ ) void
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# define INT_RETURN __declspec( __dllimport__ ) int
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# else
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# error Use of the DLL is only available on the Microsoft, Intel and GCC compilers
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# endif
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# elif defined( __WATCOMC__ )
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# define VOID_RETURN void __cdecl
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# define INT_RETURN int __cdecl
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# else
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# define VOID_RETURN void
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# define INT_RETURN int
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# endif
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#endif
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/* These defines are used to declare buffers in a way that allows
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faster operations on longer variables to be used. In all these
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defines 'size' must be a power of 2 and >= 8
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dec_unit_type(size,x) declares a variable 'x' of length
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'size' bits
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dec_bufr_type(size,bsize,x) declares a buffer 'x' of length 'bsize'
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bytes defined as an array of variables
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each of 'size' bits (bsize must be a
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multiple of size / 8)
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ptr_cast(x,size) casts a pointer to a pointer to a
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varaiable of length 'size' bits
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*/
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#define ui_type(size) uint##size##_t
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#define dec_unit_type(size,x) typedef ui_type(size) x
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#define dec_bufr_type(size,bsize,x) typedef ui_type(size) x[bsize / (size >> 3)]
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#define ptr_cast(x,size) ((ui_type(size)*)(x))
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typedef unsigned int uint_t; /* native unsigned integer */
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typedef uint8_t u08b_t; /* 8-bit unsigned integer */
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typedef uint64_t u64b_t; /* 64-bit unsigned integer */
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#ifndef RotL_64
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#define RotL_64(x,N) (((x) << (N)) | ((x) >> (64-(N))))
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#endif
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/*
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* Skein is "natively" little-endian (unlike SHA-xxx), for optimal
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* performance on x86 CPUs. The Skein code requires the following
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* definitions for dealing with endianness:
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*
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* SKEIN_NEED_SWAP: 0 for little-endian, 1 for big-endian
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* Skein_Put64_LSB_First
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* Skein_Get64_LSB_First
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* Skein_Swap64
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*
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* If SKEIN_NEED_SWAP is defined at compile time, it is used here
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* along with the portable versions of Put64/Get64/Swap64, which
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* are slow in general.
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*
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* Otherwise, an "auto-detect" of endianness is attempted below.
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* If the default handling doesn't work well, the user may insert
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* platform-specific code instead (e.g., for big-endian CPUs).
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*
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*/
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#ifndef SKEIN_NEED_SWAP /* compile-time "override" for endianness? */
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#define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
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/* special handler for IA64, which may be either endianness (?) */
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/* here we assume little-endian, but this may need to be changed */
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#if defined(__ia64) || defined(__ia64__) || defined(_M_IA64)
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# define PLATFORM_MUST_ALIGN (1)
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#ifndef PLATFORM_BYTE_ORDER
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# define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
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#endif
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#endif
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#ifndef PLATFORM_MUST_ALIGN
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# define PLATFORM_MUST_ALIGN (0)
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#endif
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#if PLATFORM_BYTE_ORDER == IS_BIG_ENDIAN
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/* here for big-endian CPUs */
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#define SKEIN_NEED_SWAP (1)
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#elif PLATFORM_BYTE_ORDER == IS_LITTLE_ENDIAN
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/* here for x86 and x86-64 CPUs (and other detected little-endian CPUs) */
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#define SKEIN_NEED_SWAP (0)
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#if PLATFORM_MUST_ALIGN == 0 /* ok to use "fast" versions? */
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#define Skein_Put64_LSB_First(dst08,src64,bCnt) memcpy(dst08,src64,bCnt)
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#define Skein_Get64_LSB_First(dst64,src08,wCnt) memcpy(dst64,src08,8*(wCnt))
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#endif
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#else
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#error "Skein needs endianness setting!"
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#endif
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#endif /* ifndef SKEIN_NEED_SWAP */
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/*
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******************************************************************
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* Provide any definitions still needed.
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******************************************************************
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*/
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#ifndef Skein_Swap64 /* swap for big-endian, nop for little-endian */
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#if SKEIN_NEED_SWAP
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#define Skein_Swap64(w64) \
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( (( ((u64b_t)(w64)) & 0xFF) << 56) | \
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(((((u64b_t)(w64)) >> 8) & 0xFF) << 48) | \
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(((((u64b_t)(w64)) >>16) & 0xFF) << 40) | \
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(((((u64b_t)(w64)) >>24) & 0xFF) << 32) | \
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(((((u64b_t)(w64)) >>32) & 0xFF) << 24) | \
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(((((u64b_t)(w64)) >>40) & 0xFF) << 16) | \
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(((((u64b_t)(w64)) >>48) & 0xFF) << 8) | \
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(((((u64b_t)(w64)) >>56) & 0xFF) ) )
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#else
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#define Skein_Swap64(w64) (w64)
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#endif
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#endif /* ifndef Skein_Swap64 */
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#ifndef Skein_Put64_LSB_First
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void Skein_Put64_LSB_First(u08b_t *dst,const u64b_t *src,size_t bCnt)
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#ifdef SKEIN_PORT_CODE /* instantiate the function code here? */
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{ /* this version is fully portable (big-endian or little-endian), but slow */
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size_t n;
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for (n=0;n<bCnt;n++)
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dst[n] = (u08b_t) (src[n>>3] >> (8*(n&7)));
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}
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#else
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; /* output only the function prototype */
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#endif
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#endif /* ifndef Skein_Put64_LSB_First */
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#ifndef Skein_Get64_LSB_First
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void Skein_Get64_LSB_First(u64b_t *dst,const u08b_t *src,size_t wCnt)
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#ifdef SKEIN_PORT_CODE /* instantiate the function code here? */
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{ /* this version is fully portable (big-endian or little-endian), but slow */
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size_t n;
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for (n=0;n<8*wCnt;n+=8)
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dst[n/8] = (((u64b_t) src[n ]) ) +
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(((u64b_t) src[n+1]) << 8) +
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(((u64b_t) src[n+2]) << 16) +
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(((u64b_t) src[n+3]) << 24) +
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(((u64b_t) src[n+4]) << 32) +
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(((u64b_t) src[n+5]) << 40) +
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(((u64b_t) src[n+6]) << 48) +
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(((u64b_t) src[n+7]) << 56) ;
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}
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#else
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; /* output only the function prototype */
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#endif
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#endif /* ifndef Skein_Get64_LSB_First */
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#endif /* ifndef _SKEIN_PORT_H_ */
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