shithub: blake2

ref: b9302b40bc4c762c4beae50a231429956533db1f
dir: /ref/blake2-impl.h/

/*
   BLAKE2 reference source code package - reference C implementations
  
   Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.  You may use this under the
   terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
   your option.  The terms of these licenses can be found at:
  
   - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
   - OpenSSL license   : https://www.openssl.org/source/license.html
   - Apache 2.0        : http://www.apache.org/licenses/LICENSE-2.0
  
   More information about the BLAKE2 hash function can be found at
   https://blake2.net.
*/
#pragma once
#ifndef __BLAKE2_IMPL_H__
#define __BLAKE2_IMPL_H__

#include <stdint.h>
#include <string.h>

static inline uint32_t load32( const void *src )
{
#if defined(NATIVE_LITTLE_ENDIAN)
  uint32_t w;
  memcpy(&w, src, sizeof w);
  return w;
#else
  const uint8_t *p = ( const uint8_t * )src;
  uint32_t w = *p++;
  w |= ( uint32_t )( *p++ ) <<  8;
  w |= ( uint32_t )( *p++ ) << 16;
  w |= ( uint32_t )( *p++ ) << 24;
  return w;
#endif
}

static inline uint64_t load64( const void *src )
{
#if defined(NATIVE_LITTLE_ENDIAN)
  uint64_t w;
  memcpy(&w, src, sizeof w);
  return w;
#else
  const uint8_t *p = ( const uint8_t * )src;
  uint64_t w = *p++;
  w |= ( uint64_t )( *p++ ) <<  8;
  w |= ( uint64_t )( *p++ ) << 16;
  w |= ( uint64_t )( *p++ ) << 24;
  w |= ( uint64_t )( *p++ ) << 32;
  w |= ( uint64_t )( *p++ ) << 40;
  w |= ( uint64_t )( *p++ ) << 48;
  w |= ( uint64_t )( *p++ ) << 56;
  return w;
#endif
}

static inline void store32( void *dst, uint32_t w )
{
#if defined(NATIVE_LITTLE_ENDIAN)
  memcpy(dst, &w, sizeof w);
#else
  uint8_t *p = ( uint8_t * )dst;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w;
#endif
}

static inline void store64( void *dst, uint64_t w )
{
#if defined(NATIVE_LITTLE_ENDIAN)
  memcpy(dst, &w, sizeof w);
#else
  uint8_t *p = ( uint8_t * )dst;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w;
#endif
}

static inline uint64_t load48( const void *src )
{
  const uint8_t *p = ( const uint8_t * )src;
  uint64_t w = *p++;
  w |= ( uint64_t )( *p++ ) <<  8;
  w |= ( uint64_t )( *p++ ) << 16;
  w |= ( uint64_t )( *p++ ) << 24;
  w |= ( uint64_t )( *p++ ) << 32;
  w |= ( uint64_t )( *p++ ) << 40;
  return w;
}

static inline void store48( void *dst, uint64_t w )
{
  uint8_t *p = ( uint8_t * )dst;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w; w >>= 8;
  *p++ = ( uint8_t )w;
}

static inline uint32_t rotl32( const uint32_t w, const unsigned c )
{
  return ( w << c ) | ( w >> ( 32 - c ) );
}

static inline uint64_t rotl64( const uint64_t w, const unsigned c )
{
  return ( w << c ) | ( w >> ( 64 - c ) );
}

static inline uint32_t rotr32( const uint32_t w, const unsigned c )
{
  return ( w >> c ) | ( w << ( 32 - c ) );
}

static inline uint64_t rotr64( const uint64_t w, const unsigned c )
{
  return ( w >> c ) | ( w << ( 64 - c ) );
}

/* prevents compiler optimizing out memset() */
static inline void secure_zero_memory(void *v, size_t n)
{
  static void *(*const volatile memset_v)(void *, int, size_t) = &memset;
  memset_v(v, 0, n);
}

#endif