text: #ifndef SCRYPT_H
  #define SCRYPT_H
  #include <stdlib.h>
  #include <stdint.h>
  
  static const int SCRYPT_SCRATCHPAD_SIZE = 131072 + 63;
  
  void scrypt_1024_1_1_256(const char *input, char *output);
  void scrypt_1024_1_1_256_sp_generic(const char *input, char *output, char *scratchpad);
  
  #if defined(USE_SSE2)
  #if defined(_M_X64) || defined(__x86_64__) || defined(_M_AMD64) || (defined(MAC_OSX) && defined(__i386__))
  #define USE_SSE2_ALWAYS 1
  #define scrypt_1024_1_1_256_sp(input, output, scratchpad) scrypt_1024_1_1_256_sp_sse2((input), (output), (scratchpad))
  #else
  #define scrypt_1024_1_1_256_sp(input, output, scratchpad) scrypt_1024_1_1_256_sp_detected((input), (output), (scratchpad))
  #endif
  
  void scrypt_detect_sse2();
  void scrypt_1024_1_1_256_sp_sse2(const char *input, char *output, char *scratchpad);
  extern void (*scrypt_1024_1_1_256_sp_detected)(const char *input, char *output, char *scratchpad);
  #else
  #define scrypt_1024_1_1_256_sp(input, output, scratchpad) scrypt_1024_1_1_256_sp_generic((input), (output), (scratchpad))
  #endif
  
  void
  PBKDF2_SHA256(const uint8_t *passwd, size_t passwdlen, const uint8_t *salt,
      size_t saltlen, uint64_t c, uint8_t *buf, size_t dkLen);
  
  static inline uint32_t spn_le32dec(const void *pp)
  {
          const uint8_t *p = (uint8_t const *)pp;
          return ((uint32_t)(p[0]) + ((uint32_t)(p[1]) << 8) +
              ((uint32_t)(p[2]) << 16) + ((uint32_t)(p[3]) << 24));
  }
  
  static inline void spn_le32enc(void *pp, uint32_t x)
  {
          uint8_t *p = (uint8_t *)pp;
          p[0] = x & 0xff;
          p[1] = (x >> 8) & 0xff;
          p[2] = (x >> 16) & 0xff;
          p[3] = (x >> 24) & 0xff;
  }
  #endif
  