| /* |
| * 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_ |
| |
| #include <sys/types.h> /* get integer type definitions */ |
| |
| #ifndef RotL_64 |
| #define RotL_64(x, N) (((x) << (N)) | ((x) >> (64 - (N)))) |
| #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 |
| * along with the portable versions of Put64/Get64/Swap64, which |
| * 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? */ |
| |
| #include <sys/isa_defs.h> /* get endianness selection */ |
| |
| #define PLATFORM_MUST_ALIGN _ALIGNMENT_REQUIRED |
| #if defined(_BIG_ENDIAN) |
| /* here for big-endian CPUs */ |
| #define SKEIN_NEED_SWAP (1) |
| #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? */ |
| #define Skein_Put64_LSB_First(dst08, src64, bCnt) bcopy(src64, dst08, bCnt) |
| #define Skein_Get64_LSB_First(dst64, src08, wCnt) \ |
| bcopy(src08, dst64, 8 * (wCnt)) |
| #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 |
| #define Skein_Swap64(w64) \ |
| (((((uint64_t)(w64)) & 0xFF) << 56) | \ |
| (((((uint64_t)(w64)) >> 8) & 0xFF) << 48) | \ |
| (((((uint64_t)(w64)) >> 16) & 0xFF) << 40) | \ |
| (((((uint64_t)(w64)) >> 24) & 0xFF) << 32) | \ |
| (((((uint64_t)(w64)) >> 32) & 0xFF) << 24) | \ |
| (((((uint64_t)(w64)) >> 40) & 0xFF) << 16) | \ |
| (((((uint64_t)(w64)) >> 48) & 0xFF) << 8) | \ |
| (((((uint64_t)(w64)) >> 56) & 0xFF))) |
| #else |
| #define Skein_Swap64(w64) (w64) |
| #endif |
| #endif /* ifndef Skein_Swap64 */ |
| |
| #ifndef Skein_Put64_LSB_First |
| void |
| Skein_Put64_LSB_First(uint8_t *dst, const uint64_t *src, size_t bCnt) |
| #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++) |
| dst[n] = (uint8_t)(src[n >> 3] >> (8 * (n & 7))); |
| } |
| #else |
| ; /* output only the function prototype */ |
| #endif |
| #endif /* ifndef Skein_Put64_LSB_First */ |
| |
| #ifndef Skein_Get64_LSB_First |
| void |
| Skein_Get64_LSB_First(uint64_t *dst, const uint8_t *src, size_t wCnt) |
| #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 < 8 * wCnt; n += 8) |
| dst[n / 8] = (((uint64_t)src[n])) + |
| (((uint64_t)src[n + 1]) << 8) + |
| (((uint64_t)src[n + 2]) << 16) + |
| (((uint64_t)src[n + 3]) << 24) + |
| (((uint64_t)src[n + 4]) << 32) + |
| (((uint64_t)src[n + 5]) << 40) + |
| (((uint64_t)src[n + 6]) << 48) + |
| (((uint64_t)src[n + 7]) << 56); |
| } |
| #else |
| ; /* output only the function prototype */ |
| #endif |
| #endif /* ifndef Skein_Get64_LSB_First */ |
| |
| #endif /* _SKEIN_PORT_H_ */ |