// Copyright (c) 2014-2018 Zano Project
// Copyright (c) 2014-2018 The Louisdor Project
// Copyright (c) 2012-2013 The Boolberry developers
// Copyright (c) 2017-2025 Lethean (https://lt.hn)
//
// Licensed under the European Union Public Licence (EUPL) version 1.2.
// You may obtain a copy of the licence at:
//
//     https://joinup.ec.europa.eu/software/page/eupl/licence-eupl
//
// The EUPL is a copyleft licence that is compatible with the MIT/X11
// licence used by the original projects; the MIT terms are therefore
// considered “grandfathered” under the EUPL for this code.
//
// SPDX‑License‑Identifier: EUPL-1.2
//
#ifndef BLAKE2_IMPL_H
#define BLAKE2_IMPL_H

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

#if !defined(__cplusplus) && (!defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L)
  #if   defined(_MSC_VER)
    #define BLAKE2_INLINE __inline
  #elif defined(__GNUC__)
    #define BLAKE2_INLINE __inline__
  #else
    #define BLAKE2_INLINE
  #endif
#else
  #define BLAKE2_INLINE inline
#endif

static BLAKE2_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;
  return (( uint32_t )( p[0] ) <<  0) |
         (( uint32_t )( p[1] ) <<  8) |
         (( uint32_t )( p[2] ) << 16) |
         (( uint32_t )( p[3] ) << 24) ;
#endif
}

static BLAKE2_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;
  return (( uint64_t )( p[0] ) <<  0) |
         (( uint64_t )( p[1] ) <<  8) |
         (( uint64_t )( p[2] ) << 16) |
         (( uint64_t )( p[3] ) << 24) |
         (( uint64_t )( p[4] ) << 32) |
         (( uint64_t )( p[5] ) << 40) |
         (( uint64_t )( p[6] ) << 48) |
         (( uint64_t )( p[7] ) << 56) ;
#endif
}

static BLAKE2_INLINE uint16_t load16( const void *src )
{
#if defined(NATIVE_LITTLE_ENDIAN)
  uint16_t w;
  memcpy(&w, src, sizeof w);
  return w;
#else
  const uint8_t *p = ( const uint8_t * )src;
  return ( uint16_t )((( uint32_t )( p[0] ) <<  0) |
                      (( uint32_t )( p[1] ) <<  8));
#endif
}

static BLAKE2_INLINE void store16( void *dst, uint16_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;
#endif
}

static BLAKE2_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[0] = (uint8_t)(w >>  0);
  p[1] = (uint8_t)(w >>  8);
  p[2] = (uint8_t)(w >> 16);
  p[3] = (uint8_t)(w >> 24);
#endif
}

static BLAKE2_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[0] = (uint8_t)(w >>  0);
  p[1] = (uint8_t)(w >>  8);
  p[2] = (uint8_t)(w >> 16);
  p[3] = (uint8_t)(w >> 24);
  p[4] = (uint8_t)(w >> 32);
  p[5] = (uint8_t)(w >> 40);
  p[6] = (uint8_t)(w >> 48);
  p[7] = (uint8_t)(w >> 56);
#endif
}

static BLAKE2_INLINE uint64_t load48( const void *src )
{
  const uint8_t *p = ( const uint8_t * )src;
  return (( uint64_t )( p[0] ) <<  0) |
         (( uint64_t )( p[1] ) <<  8) |
         (( uint64_t )( p[2] ) << 16) |
         (( uint64_t )( p[3] ) << 24) |
         (( uint64_t )( p[4] ) << 32) |
         (( uint64_t )( p[5] ) << 40) ;
}

static BLAKE2_INLINE void store48( void *dst, uint64_t w )
{
  uint8_t *p = ( uint8_t * )dst;
  p[0] = (uint8_t)(w >>  0);
  p[1] = (uint8_t)(w >>  8);
  p[2] = (uint8_t)(w >> 16);
  p[3] = (uint8_t)(w >> 24);
  p[4] = (uint8_t)(w >> 32);
  p[5] = (uint8_t)(w >> 40);
}

static BLAKE2_INLINE uint32_t rotr32( const uint32_t w, const unsigned c )
{
  return ( w >> c ) | ( w << ( 32 - c ) );
}

static BLAKE2_INLINE uint64_t rotr64( const uint64_t w, const unsigned c )
{
  return ( w >> c ) | ( w << ( 64 - c ) );
}

/* prevents compiler optimizing out memset() */
static BLAKE2_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