1 /* 2 * Platform-specific definitions for Skein hash function. 3 * 4 * Source code author: Doug Whiting, 2008. 5 * 6 * This algorithm and source code is released to the public domain. 7 * 8 * Many thanks to Brian Gladman for his portable header files. 9 * 10 * To port Skein to an "unsupported" platform, change the definitions 11 * in this file appropriately. 12 */ 13 /* Copyright 2013 Doug Whiting. This code is released to the public domain. */ 14 15 #ifndef _SKEIN_PORT_H_ 16 #define _SKEIN_PORT_H_ 17 18 #include <sys/types.h> /* get integer type definitions */ 19 #include <sys/systm.h> /* for bcopy() */ 20 21 #ifndef RotL_64 22 #define RotL_64(x, N) (((x) << (N)) | ((x) >> (64 - (N)))) 23 #endif 24 25 /* 26 * Skein is "natively" little-endian (unlike SHA-xxx), for optimal 27 * performance on x86 CPUs. The Skein code requires the following 28 * definitions for dealing with endianness: 29 * 30 * SKEIN_NEED_SWAP: 0 for little-endian, 1 for big-endian 31 * Skein_Put64_LSB_First 32 * Skein_Get64_LSB_First 33 * Skein_Swap64 34 * 35 * If SKEIN_NEED_SWAP is defined at compile time, it is used here 36 * along with the portable versions of Put64/Get64/Swap64, which 37 * are slow in general. 38 * 39 * Otherwise, an "auto-detect" of endianness is attempted below. 40 * If the default handling doesn't work well, the user may insert 41 * platform-specific code instead (e.g., for big-endian CPUs). 42 * 43 */ 44 #ifndef SKEIN_NEED_SWAP /* compile-time "override" for endianness? */ 45 46 #ifndef _STANDALONE 47 #include <sys/isa_defs.h> /* get endianness selection */ 48 #else 49 #include <sys/param.h> /* get endianness selection */ 50 #define _ALIGNMENT_REQUIRED 1 51 /* 52 * The STANDALONE build is using endian.h logic, where we have defined 53 * macros _BIG_ENDIAN and _LITTLE_ENDIAN, and the current endian is set 54 * in _BYTE_ORDER. To keep the changes minimal, we need to #undef the 55 * other. Once we have kernel version of endian.h, we can have further 56 * clean up. 57 */ 58 #if (_BYTE_ORDER == _LITTLE_ENDIAN) 59 #undef _BIG_ENDIAN 60 #else 61 #undef _LITTLE_ENDIAN 62 #endif 63 #endif 64 65 #define PLATFORM_MUST_ALIGN _ALIGNMENT_REQUIRED 66 #if defined(_BIG_ENDIAN) 67 /* here for big-endian CPUs */ 68 #define SKEIN_NEED_SWAP (1) 69 #else 70 /* here for x86 and x86-64 CPUs (and other detected little-endian CPUs) */ 71 #define SKEIN_NEED_SWAP (0) 72 #if PLATFORM_MUST_ALIGN == 0 /* ok to use "fast" versions? */ 73 #define Skein_Put64_LSB_First(dst08, src64, bCnt) bcopy(src64, dst08, bCnt) 74 #define Skein_Get64_LSB_First(dst64, src08, wCnt) \ 75 bcopy(src08, dst64, 8 * (wCnt)) 76 #endif 77 #endif 78 79 #endif /* ifndef SKEIN_NEED_SWAP */ 80 81 /* 82 * Provide any definitions still needed. 83 */ 84 #ifndef Skein_Swap64 /* swap for big-endian, nop for little-endian */ 85 #if SKEIN_NEED_SWAP 86 #define Skein_Swap64(w64) \ 87 (((((uint64_t)(w64)) & 0xFF) << 56) | \ 88 (((((uint64_t)(w64)) >> 8) & 0xFF) << 48) | \ 89 (((((uint64_t)(w64)) >> 16) & 0xFF) << 40) | \ 90 (((((uint64_t)(w64)) >> 24) & 0xFF) << 32) | \ 91 (((((uint64_t)(w64)) >> 32) & 0xFF) << 24) | \ 92 (((((uint64_t)(w64)) >> 40) & 0xFF) << 16) | \ 93 (((((uint64_t)(w64)) >> 48) & 0xFF) << 8) | \ 94 (((((uint64_t)(w64)) >> 56) & 0xFF))) 95 #else 96 #define Skein_Swap64(w64) (w64) 97 #endif 98 #endif /* ifndef Skein_Swap64 */ 99 100 #ifndef Skein_Put64_LSB_First 101 void 102 Skein_Put64_LSB_First(uint8_t *dst, const uint64_t *src, size_t bCnt) 103 #ifdef SKEIN_PORT_CODE /* instantiate the function code here? */ 104 { 105 /* 106 * this version is fully portable (big-endian or little-endian), 107 * but slow 108 */ 109 size_t n; 110 111 for (n = 0; n < bCnt; n++) 112 dst[n] = (uint8_t)(src[n >> 3] >> (8 * (n & 7))); 113 } 114 #else 115 ; /* output only the function prototype */ 116 #endif 117 #endif /* ifndef Skein_Put64_LSB_First */ 118 119 #ifndef Skein_Get64_LSB_First 120 void 121 Skein_Get64_LSB_First(uint64_t *dst, const uint8_t *src, size_t wCnt) 122 #ifdef SKEIN_PORT_CODE /* instantiate the function code here? */ 123 { 124 /* 125 * this version is fully portable (big-endian or little-endian), 126 * but slow 127 */ 128 size_t n; 129 130 for (n = 0; n < 8 * wCnt; n += 8) 131 dst[n / 8] = (((uint64_t)src[n])) + 132 (((uint64_t)src[n + 1]) << 8) + 133 (((uint64_t)src[n + 2]) << 16) + 134 (((uint64_t)src[n + 3]) << 24) + 135 (((uint64_t)src[n + 4]) << 32) + 136 (((uint64_t)src[n + 5]) << 40) + 137 (((uint64_t)src[n + 6]) << 48) + 138 (((uint64_t)src[n + 7]) << 56); 139 } 140 #else 141 ; /* output only the function prototype */ 142 #endif 143 #endif /* ifndef Skein_Get64_LSB_First */ 144 145 #endif /* _SKEIN_PORT_H_ */ 146