diff options
Diffstat (limited to 'drivers/staging/skein/include/skein_port.h')
| -rw-r--r-- | drivers/staging/skein/include/skein_port.h | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/staging/skein/include/skein_port.h b/drivers/staging/skein/include/skein_port.h new file mode 100644 index 0000000..659a948 --- /dev/null +++ b/drivers/staging/skein/include/skein_port.h @@ -0,0 +1,124 @@ +#ifndef _SKEIN_PORT_H_ +#define _SKEIN_PORT_H_ +/******************************************************************* +** +** 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. +** +********************************************************************/ + +#include <brg_types.h> /* get integer type definitions */ + +typedef unsigned int uint_t; /* native unsigned integer */ +typedef uint_8t u08b_t; /* 8-bit unsigned integer */ +typedef uint_64t u64b_t; /* 64-bit unsigned integer */ + +#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 <brg_endian.h> /* get endianness selection */ +#if PLATFORM_BYTE_ORDER == IS_BIG_ENDIAN + /* here for big-endian CPUs */ +#define SKEIN_NEED_SWAP (1) +#elif PLATFORM_BYTE_ORDER == IS_LITTLE_ENDIAN + /* 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) memcpy(dst08,src64,bCnt) +#define Skein_Get64_LSB_First(dst64,src08,wCnt) memcpy(dst64,src08,8*(wCnt)) +#endif +#else +#error "Skein needs endianness setting!" +#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) \ + ( (( ((u64b_t)(w64)) & 0xFF) << 56) | \ + (((((u64b_t)(w64)) >> 8) & 0xFF) << 48) | \ + (((((u64b_t)(w64)) >>16) & 0xFF) << 40) | \ + (((((u64b_t)(w64)) >>24) & 0xFF) << 32) | \ + (((((u64b_t)(w64)) >>32) & 0xFF) << 24) | \ + (((((u64b_t)(w64)) >>40) & 0xFF) << 16) | \ + (((((u64b_t)(w64)) >>48) & 0xFF) << 8) | \ + (((((u64b_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(u08b_t *dst,const u64b_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] = (u08b_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(u64b_t *dst,const u08b_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] = (((u64b_t) src[n ]) ) + + (((u64b_t) src[n+1]) << 8) + + (((u64b_t) src[n+2]) << 16) + + (((u64b_t) src[n+3]) << 24) + + (((u64b_t) src[n+4]) << 32) + + (((u64b_t) src[n+5]) << 40) + + (((u64b_t) src[n+6]) << 48) + + (((u64b_t) src[n+7]) << 56) ; + } +#else + ; /* output only the function prototype */ +#endif +#endif /* ifndef Skein_Get64_LSB_First */ + +#endif /* ifndef _SKEIN_PORT_H_ */ |
