text: #ifndef crypto_secretbox_xsalsa20poly1305_H
  #define crypto_secretbox_xsalsa20poly1305_H
  
  #include <stddef.h>
  #include "export.h"
  
  #ifdef __cplusplus
  # if __GNUC__
  #  pragma GCC diagnostic ignored "-Wlong-long"
  # endif
  extern "C" {
  #endif
  
  #define crypto_secretbox_xsalsa20poly1305_KEYBYTES 32U
  SODIUM_EXPORT
  size_t crypto_secretbox_xsalsa20poly1305_keybytes(void);
  
  #define crypto_secretbox_xsalsa20poly1305_NONCEBYTES 24U
  SODIUM_EXPORT
  size_t crypto_secretbox_xsalsa20poly1305_noncebytes(void);
  
  #define crypto_secretbox_xsalsa20poly1305_MACBYTES 16U
  SODIUM_EXPORT
  size_t crypto_secretbox_xsalsa20poly1305_macbytes(void);
  
  #define crypto_secretbox_xsalsa20poly1305_BOXZEROBYTES 16U
  SODIUM_EXPORT
  size_t crypto_secretbox_xsalsa20poly1305_boxzerobytes(void);
  
  #define crypto_secretbox_xsalsa20poly1305_ZEROBYTES \
      (crypto_secretbox_xsalsa20poly1305_BOXZEROBYTES + \
       crypto_secretbox_xsalsa20poly1305_MACBYTES)
  SODIUM_EXPORT
  size_t crypto_secretbox_xsalsa20poly1305_zerobytes(void);
  
  SODIUM_EXPORT
  int crypto_secretbox_xsalsa20poly1305(unsigned char *c,
                                        const unsigned char *m,
                                        unsigned long long mlen,
                                        const unsigned char *n,
                                        const unsigned char *k);
  
  SODIUM_EXPORT
  int crypto_secretbox_xsalsa20poly1305_open(unsigned char *m,
                                             const unsigned char *c,
                                             unsigned long long clen,
                                             const unsigned char *n,
                                             const unsigned char *k);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif
  