#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 <ccrtp/crypto/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 <ccrtp/crypto/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_ */ |