127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
/*
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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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/* Copyright 2013 Doug Whiting. This code is released to the public domain. */
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#ifndef _SKEIN_PORT_H_
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#define _SKEIN_PORT_H_
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#include <sys/types.h> /* get integer type definitions */
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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 <sys/isa_defs.h> /* get endianness selection */
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#define PLATFORM_MUST_ALIGN _ALIGNMENT_REQUIRED
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#if defined(_BIG_ENDIAN)
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/* here for big-endian CPUs */
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#define SKEIN_NEED_SWAP (1)
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#else
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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) bcopy(src64, dst08, bCnt)
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#define Skein_Get64_LSB_First(dst64, src08, wCnt) \
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bcopy(src08, dst64, 8 * (wCnt))
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#endif
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#endif
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#endif /* ifndef SKEIN_NEED_SWAP */
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/*
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* Provide any definitions still needed.
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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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(((((uint64_t)(w64)) & 0xFF) << 56) | \
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(((((uint64_t)(w64)) >> 8) & 0xFF) << 48) | \
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(((((uint64_t)(w64)) >> 16) & 0xFF) << 40) | \
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(((((uint64_t)(w64)) >> 24) & 0xFF) << 32) | \
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(((((uint64_t)(w64)) >> 32) & 0xFF) << 24) | \
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(((((uint64_t)(w64)) >> 40) & 0xFF) << 16) | \
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(((((uint64_t)(w64)) >> 48) & 0xFF) << 8) | \
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(((((uint64_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
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Skein_Put64_LSB_First(uint8_t *dst, const uint64_t *src, size_t bCnt)
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#ifdef SKEIN_PORT_CODE /* instantiate the function code here? */
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{
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/*
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* this version is fully portable (big-endian or little-endian),
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* but slow
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*/
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size_t n;
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for (n = 0; n < bCnt; n++)
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dst[n] = (uint8_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
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Skein_Get64_LSB_First(uint64_t *dst, const uint8_t *src, size_t wCnt)
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#ifdef SKEIN_PORT_CODE /* instantiate the function code here? */
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{
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/*
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* this version is fully portable (big-endian or little-endian),
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* but slow
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*/
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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] = (((uint64_t)src[n])) +
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(((uint64_t)src[n + 1]) << 8) +
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(((uint64_t)src[n + 2]) << 16) +
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(((uint64_t)src[n + 3]) << 24) +
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(((uint64_t)src[n + 4]) << 32) +
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(((uint64_t)src[n + 5]) << 40) +
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(((uint64_t)src[n + 6]) << 48) +
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(((uint64_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 /* _SKEIN_PORT_H_ */
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