/*
* Platform-specific definitions for Skein hash function.
*
* Source code author: Doug Whiting, 2008.
*
* This algorithm and source code is released to the public domain.
*
* Many thanks to Brian Gladman for his portable header files.
*
* To port Skein to an "unsupported" platform, change the definitions
* in this file appropriately.
*/
/* Copyright 2013 Doug Whiting. This code is released to the public domain. */
#ifndef _SKEIN_PORT_H_
#define _SKEIN_PORT_H_
#ifndef RotL_64
#endif
/*
* Skein is "natively" little-endian (unlike SHA-xxx), for optimal
* performance on x86 CPUs. The Skein code requires the following
* definitions for dealing with endianness:
*
* SKEIN_NEED_SWAP: 0 for little-endian, 1 for big-endian
* Skein_Put64_LSB_First
* Skein_Get64_LSB_First
* Skein_Swap64
*
* If SKEIN_NEED_SWAP is defined at compile time, it is used here
* are slow in general.
*
* Otherwise, an "auto-detect" of endianness is attempted below.
* If the default handling doesn't work well, the user may insert
* platform-specific code instead (e.g., for big-endian CPUs).
*
*/
#ifndef SKEIN_NEED_SWAP /* compile-time "override" for endianness? */
#if defined(_BIG_ENDIAN)
/* here for big-endian CPUs */
#else
/* here for x86 and x86-64 CPUs (and other detected little-endian CPUs) */
#define SKEIN_NEED_SWAP (0)
#if PLATFORM_MUST_ALIGN == 0 /* ok to use "fast" versions? */
#endif
#endif
#endif /* ifndef SKEIN_NEED_SWAP */
/*
* Provide any definitions still needed.
*/
#ifndef Skein_Swap64 /* swap for big-endian, nop for little-endian */
#if SKEIN_NEED_SWAP
#else
#endif
#endif /* ifndef Skein_Swap64 */
#ifndef Skein_Put64_LSB_First
void
#ifdef SKEIN_PORT_CODE /* instantiate the function code here? */
{
/*
* this version is fully portable (big-endian or little-endian),
* but slow
*/
size_t n;
for (n = 0; n < bCnt; n++)
}
#else
; /* output only the function prototype */
#endif
#endif /* ifndef Skein_Put64_LSB_First */
#ifndef Skein_Get64_LSB_First
void
#ifdef SKEIN_PORT_CODE /* instantiate the function code here? */
{
/*
* this version is fully portable (big-endian or little-endian),
* but slow
*/
size_t n;
}
#else
; /* output only the function prototype */
#endif
#endif /* ifndef Skein_Get64_LSB_First */
#endif /* _SKEIN_PORT_H_ */