Emeric Vigier | 2f62582 | 2012-08-06 11:09:52 -0400 | [diff] [blame] | 1 | #ifndef _SKEIN_PORT_H_
|
| 2 | #define _SKEIN_PORT_H_
|
| 3 | /*******************************************************************
|
| 4 | **
|
| 5 | ** Platform-specific definitions for Skein hash function.
|
| 6 | **
|
| 7 | ** Source code author: Doug Whiting, 2008.
|
| 8 | **
|
| 9 | ** This algorithm and source code is released to the public domain.
|
| 10 | **
|
| 11 | ** Many thanks to Brian Gladman for his portable header files.
|
| 12 | **
|
| 13 | ** To port Skein to an "unsupported" platform, change the definitions
|
| 14 | ** in this file appropriately.
|
| 15 | **
|
| 16 | ********************************************************************/
|
| 17 |
|
| 18 | #include <ccrtp/crypto/brg_types.h> /* get integer type definitions */
|
| 19 |
|
| 20 | typedef unsigned int uint_t; /* native unsigned integer */
|
| 21 | typedef uint_8t u08b_t; /* 8-bit unsigned integer */
|
| 22 | typedef uint_64t u64b_t; /* 64-bit unsigned integer */
|
| 23 |
|
| 24 | #ifndef RotL_64
|
| 25 | #define RotL_64(x,N) (((x) << (N)) | ((x) >> (64-(N))))
|
| 26 | #endif
|
| 27 |
|
| 28 | /*
|
| 29 | * Skein is "natively" little-endian (unlike SHA-xxx), for optimal
|
| 30 | * performance on x86 CPUs. The Skein code requires the following
|
| 31 | * definitions for dealing with endianness:
|
| 32 | *
|
| 33 | * SKEIN_NEED_SWAP: 0 for little-endian, 1 for big-endian
|
| 34 | * Skein_Put64_LSB_First
|
| 35 | * Skein_Get64_LSB_First
|
| 36 | * Skein_Swap64
|
| 37 | *
|
| 38 | * If SKEIN_NEED_SWAP is defined at compile time, it is used here
|
| 39 | * along with the portable versions of Put64/Get64/Swap64, which
|
| 40 | * are slow in general.
|
| 41 | *
|
| 42 | * Otherwise, an "auto-detect" of endianness is attempted below.
|
| 43 | * If the default handling doesn't work well, the user may insert
|
| 44 | * platform-specific code instead (e.g., for big-endian CPUs).
|
| 45 | *
|
| 46 | */
|
| 47 | #ifndef SKEIN_NEED_SWAP /* compile-time "override" for endianness? */
|
| 48 |
|
| 49 | #include <ccrtp/crypto/brg_endian.h> /* get endianness selection */
|
| 50 | #if PLATFORM_BYTE_ORDER == IS_BIG_ENDIAN
|
| 51 | /* here for big-endian CPUs */
|
| 52 | #define SKEIN_NEED_SWAP (1)
|
| 53 | #elif PLATFORM_BYTE_ORDER == IS_LITTLE_ENDIAN
|
| 54 | /* here for x86 and x86-64 CPUs (and other detected little-endian CPUs) */
|
| 55 | #define SKEIN_NEED_SWAP (0)
|
| 56 | #if PLATFORM_MUST_ALIGN == 0 /* ok to use "fast" versions? */
|
| 57 | #define Skein_Put64_LSB_First(dst08,src64,bCnt) memcpy(dst08,src64,bCnt)
|
| 58 | #define Skein_Get64_LSB_First(dst64,src08,wCnt) memcpy(dst64,src08,8*(wCnt))
|
| 59 | #endif
|
| 60 | #else
|
| 61 | #error "Skein needs endianness setting!"
|
| 62 | #endif
|
| 63 |
|
| 64 | #endif /* ifndef SKEIN_NEED_SWAP */
|
| 65 |
|
| 66 | /*
|
| 67 | ******************************************************************
|
| 68 | * Provide any definitions still needed.
|
| 69 | ******************************************************************
|
| 70 | */
|
| 71 | #ifndef Skein_Swap64 /* swap for big-endian, nop for little-endian */
|
| 72 | #if SKEIN_NEED_SWAP
|
| 73 | #define Skein_Swap64(w64) \
|
| 74 | ( (( ((u64b_t)(w64)) & 0xFF) << 56) | \
|
| 75 | (((((u64b_t)(w64)) >> 8) & 0xFF) << 48) | \
|
| 76 | (((((u64b_t)(w64)) >>16) & 0xFF) << 40) | \
|
| 77 | (((((u64b_t)(w64)) >>24) & 0xFF) << 32) | \
|
| 78 | (((((u64b_t)(w64)) >>32) & 0xFF) << 24) | \
|
| 79 | (((((u64b_t)(w64)) >>40) & 0xFF) << 16) | \
|
| 80 | (((((u64b_t)(w64)) >>48) & 0xFF) << 8) | \
|
| 81 | (((((u64b_t)(w64)) >>56) & 0xFF) ) )
|
| 82 | #else
|
| 83 | #define Skein_Swap64(w64) (w64)
|
| 84 | #endif
|
| 85 | #endif /* ifndef Skein_Swap64 */
|
| 86 |
|
| 87 |
|
| 88 | #ifndef Skein_Put64_LSB_First
|
| 89 | void Skein_Put64_LSB_First(u08b_t *dst,const u64b_t *src,size_t bCnt)
|
| 90 | #ifdef SKEIN_PORT_CODE /* instantiate the function code here? */
|
| 91 | { /* this version is fully portable (big-endian or little-endian), but slow */
|
| 92 | size_t n;
|
| 93 |
|
| 94 | for (n=0;n<bCnt;n++)
|
| 95 | dst[n] = (u08b_t) (src[n>>3] >> (8*(n&7)));
|
| 96 | }
|
| 97 | #else
|
| 98 | ; /* output only the function prototype */
|
| 99 | #endif
|
| 100 | #endif /* ifndef Skein_Put64_LSB_First */
|
| 101 |
|
| 102 |
|
| 103 | #ifndef Skein_Get64_LSB_First
|
| 104 | void Skein_Get64_LSB_First(u64b_t *dst,const u08b_t *src,size_t wCnt)
|
| 105 | #ifdef SKEIN_PORT_CODE /* instantiate the function code here? */
|
| 106 | { /* this version is fully portable (big-endian or little-endian), but slow */
|
| 107 | size_t n;
|
| 108 |
|
| 109 | for (n=0;n<8*wCnt;n+=8)
|
| 110 | dst[n/8] = (((u64b_t) src[n ]) ) +
|
| 111 | (((u64b_t) src[n+1]) << 8) +
|
| 112 | (((u64b_t) src[n+2]) << 16) +
|
| 113 | (((u64b_t) src[n+3]) << 24) +
|
| 114 | (((u64b_t) src[n+4]) << 32) +
|
| 115 | (((u64b_t) src[n+5]) << 40) +
|
| 116 | (((u64b_t) src[n+6]) << 48) +
|
| 117 | (((u64b_t) src[n+7]) << 56) ;
|
| 118 | }
|
| 119 | #else
|
| 120 | ; /* output only the function prototype */
|
| 121 | #endif
|
| 122 | #endif /* ifndef Skein_Get64_LSB_First */
|
| 123 |
|
| 124 | #endif /* ifndef _SKEIN_PORT_H_ */
|