eda312ce1e
Import Skein code from NIST CD submission Make checksum algorithms pluggable Fix handling of huge buffers (>2GB) in LZP Cleanup of some buffer sizing code Speed up CRC64 calculation in dedupe chunking
124 lines
4.5 KiB
C
124 lines
4.5 KiB
C
#ifndef _SKEIN_PORT_H_
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#define _SKEIN_PORT_H_
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/*******************************************************************
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**
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** Platform-specific definitions for Skein hash function.
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**
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** Source code author: Doug Whiting, 2008.
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**
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** This algorithm and source code is released to the public domain.
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**
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** Many thanks to Brian Gladman for his portable header files.
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**
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** To port Skein to an "unsupported" platform, change the definitions
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** in this file appropriately.
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**
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********************************************************************/
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#include "brg_types.h" /* get integer type definitions */
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typedef unsigned int uint_t; /* native unsigned integer */
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typedef uint_8t u08b_t; /* 8-bit unsigned integer */
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typedef uint_64t 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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#include "brg_endian.h" /* get endianness selection */
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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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