dedup

deduplicating backup program
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blake2-impl.h (4201B)


      1 /*
      2    BLAKE2 reference source code package - reference C implementations
      3 
      4    Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.  You may use this under the
      5    terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
      6    your option.  The terms of these licenses can be found at:
      7 
      8    - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
      9    - OpenSSL license   : https://www.openssl.org/source/license.html
     10    - Apache 2.0        : http://www.apache.org/licenses/LICENSE-2.0
     11 
     12    More information about the BLAKE2 hash function can be found at
     13    https://blake2.net.
     14 */
     15 #ifndef BLAKE2_IMPL_H
     16 #define BLAKE2_IMPL_H
     17 
     18 #include <stdint.h>
     19 #include <string.h>
     20 
     21 #if !defined(__cplusplus) && (!defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L)
     22   #if   defined(_MSC_VER)
     23     #define BLAKE2_INLINE __inline
     24   #elif defined(__GNUC__)
     25     #define BLAKE2_INLINE __inline__
     26   #else
     27     #define BLAKE2_INLINE
     28   #endif
     29 #else
     30   #define BLAKE2_INLINE inline
     31 #endif
     32 
     33 static BLAKE2_INLINE uint32_t load32( const void *src )
     34 {
     35 #if defined(NATIVE_LITTLE_ENDIAN)
     36   uint32_t w;
     37   memcpy(&w, src, sizeof w);
     38   return w;
     39 #else
     40   const uint8_t *p = ( const uint8_t * )src;
     41   return (( uint32_t )( p[0] ) <<  0) |
     42          (( uint32_t )( p[1] ) <<  8) |
     43          (( uint32_t )( p[2] ) << 16) |
     44          (( uint32_t )( p[3] ) << 24) ;
     45 #endif
     46 }
     47 
     48 static BLAKE2_INLINE uint64_t load64( const void *src )
     49 {
     50 #if defined(NATIVE_LITTLE_ENDIAN)
     51   uint64_t w;
     52   memcpy(&w, src, sizeof w);
     53   return w;
     54 #else
     55   const uint8_t *p = ( const uint8_t * )src;
     56   return (( uint64_t )( p[0] ) <<  0) |
     57          (( uint64_t )( p[1] ) <<  8) |
     58          (( uint64_t )( p[2] ) << 16) |
     59          (( uint64_t )( p[3] ) << 24) |
     60          (( uint64_t )( p[4] ) << 32) |
     61          (( uint64_t )( p[5] ) << 40) |
     62          (( uint64_t )( p[6] ) << 48) |
     63          (( uint64_t )( p[7] ) << 56) ;
     64 #endif
     65 }
     66 
     67 static BLAKE2_INLINE uint16_t load16( const void *src )
     68 {
     69 #if defined(NATIVE_LITTLE_ENDIAN)
     70   uint16_t w;
     71   memcpy(&w, src, sizeof w);
     72   return w;
     73 #else
     74   const uint8_t *p = ( const uint8_t * )src;
     75   return ( uint16_t )((( uint32_t )( p[0] ) <<  0) |
     76                       (( uint32_t )( p[1] ) <<  8));
     77 #endif
     78 }
     79 
     80 static BLAKE2_INLINE void store16( void *dst, uint16_t w )
     81 {
     82 #if defined(NATIVE_LITTLE_ENDIAN)
     83   memcpy(dst, &w, sizeof w);
     84 #else
     85   uint8_t *p = ( uint8_t * )dst;
     86   *p++ = ( uint8_t )w; w >>= 8;
     87   *p++ = ( uint8_t )w;
     88 #endif
     89 }
     90 
     91 static BLAKE2_INLINE void store32( void *dst, uint32_t w )
     92 {
     93 #if defined(NATIVE_LITTLE_ENDIAN)
     94   memcpy(dst, &w, sizeof w);
     95 #else
     96   uint8_t *p = ( uint8_t * )dst;
     97   p[0] = (uint8_t)(w >>  0);
     98   p[1] = (uint8_t)(w >>  8);
     99   p[2] = (uint8_t)(w >> 16);
    100   p[3] = (uint8_t)(w >> 24);
    101 #endif
    102 }
    103 
    104 static BLAKE2_INLINE void store64( void *dst, uint64_t w )
    105 {
    106 #if defined(NATIVE_LITTLE_ENDIAN)
    107   memcpy(dst, &w, sizeof w);
    108 #else
    109   uint8_t *p = ( uint8_t * )dst;
    110   p[0] = (uint8_t)(w >>  0);
    111   p[1] = (uint8_t)(w >>  8);
    112   p[2] = (uint8_t)(w >> 16);
    113   p[3] = (uint8_t)(w >> 24);
    114   p[4] = (uint8_t)(w >> 32);
    115   p[5] = (uint8_t)(w >> 40);
    116   p[6] = (uint8_t)(w >> 48);
    117   p[7] = (uint8_t)(w >> 56);
    118 #endif
    119 }
    120 
    121 static BLAKE2_INLINE uint64_t load48( const void *src )
    122 {
    123   const uint8_t *p = ( const uint8_t * )src;
    124   return (( uint64_t )( p[0] ) <<  0) |
    125          (( uint64_t )( p[1] ) <<  8) |
    126          (( uint64_t )( p[2] ) << 16) |
    127          (( uint64_t )( p[3] ) << 24) |
    128          (( uint64_t )( p[4] ) << 32) |
    129          (( uint64_t )( p[5] ) << 40) ;
    130 }
    131 
    132 static BLAKE2_INLINE void store48( void *dst, uint64_t w )
    133 {
    134   uint8_t *p = ( uint8_t * )dst;
    135   p[0] = (uint8_t)(w >>  0);
    136   p[1] = (uint8_t)(w >>  8);
    137   p[2] = (uint8_t)(w >> 16);
    138   p[3] = (uint8_t)(w >> 24);
    139   p[4] = (uint8_t)(w >> 32);
    140   p[5] = (uint8_t)(w >> 40);
    141 }
    142 
    143 static BLAKE2_INLINE uint32_t rotr32( const uint32_t w, const unsigned c )
    144 {
    145   return ( w >> c ) | ( w << ( 32 - c ) );
    146 }
    147 
    148 static BLAKE2_INLINE uint64_t rotr64( const uint64_t w, const unsigned c )
    149 {
    150   return ( w >> c ) | ( w << ( 64 - c ) );
    151 }
    152 
    153 /* prevents compiler optimizing out memset() */
    154 static BLAKE2_INLINE void secure_zero_memory(void *v, size_t n)
    155 {
    156   static void *(*const volatile memset_v)(void *, int, size_t) = &memset;
    157   memset_v(v, 0, n);
    158 }
    159 
    160 #endif