text: 
  #ifndef crypto_box_curve25519xchacha20poly1305_H
  #define crypto_box_curve25519xchacha20poly1305_H
  
  #include <stddef.h>
  #include "export.h"
  
  #ifdef __cplusplus
  # ifdef __GNUC__
  #  pragma GCC diagnostic ignored "-Wlong-long"
  # endif
  extern "C" {
  #endif
  
  #define crypto_box_curve25519xchacha20poly1305_SEEDBYTES 32U
  SODIUM_EXPORT
  size_t crypto_box_curve25519xchacha20poly1305_seedbytes(void);
  
  #define crypto_box_curve25519xchacha20poly1305_PUBLICKEYBYTES 32U
  SODIUM_EXPORT
  size_t crypto_box_curve25519xchacha20poly1305_publickeybytes(void);
  
  #define crypto_box_curve25519xchacha20poly1305_SECRETKEYBYTES 32U
  SODIUM_EXPORT
  size_t crypto_box_curve25519xchacha20poly1305_secretkeybytes(void);
  
  #define crypto_box_curve25519xchacha20poly1305_BEFORENMBYTES 32U
  SODIUM_EXPORT
  size_t crypto_box_curve25519xchacha20poly1305_beforenmbytes(void);
  
  #define crypto_box_curve25519xchacha20poly1305_NONCEBYTES 24U
  SODIUM_EXPORT
  size_t crypto_box_curve25519xchacha20poly1305_noncebytes(void);
  
  #define crypto_box_curve25519xchacha20poly1305_MACBYTES 16U
  SODIUM_EXPORT
  size_t crypto_box_curve25519xchacha20poly1305_macbytes(void);
  
  SODIUM_EXPORT
  int crypto_box_curve25519xchacha20poly1305_seed_keypair(unsigned char *pk,
                                                          unsigned char *sk,
                                                          const unsigned char *seed);
  
  SODIUM_EXPORT
  int crypto_box_curve25519xchacha20poly1305_keypair(unsigned char *pk,
                                                     unsigned char *sk);
  
  SODIUM_EXPORT
  int crypto_box_curve25519xchacha20poly1305_easy(unsigned char *c,
                                                  const unsigned char *m,
                                                  unsigned long long mlen,
                                                  const unsigned char *n,
                                                  const unsigned char *pk,
                                                  const unsigned char *sk)
              __attribute__ ((warn_unused_result));
  
  SODIUM_EXPORT
  int crypto_box_curve25519xchacha20poly1305_open_easy(unsigned char *m,
                                                       const unsigned char *c,
                                                       unsigned long long clen,
                                                       const unsigned char *n,
                                                       const unsigned char *pk,
                                                       const unsigned char *sk)
              __attribute__ ((warn_unused_result));
  
  SODIUM_EXPORT
  int crypto_box_curve25519xchacha20poly1305_detached(unsigned char *c,
                                                      unsigned char *mac,
                                                      const unsigned char *m,
                                                      unsigned long long mlen,
                                                      const unsigned char *n,
                                                      const unsigned char *pk,
                                                      const unsigned char *sk)
              __attribute__ ((warn_unused_result));
  
  SODIUM_EXPORT
  int crypto_box_curve25519xchacha20poly1305_open_detached(unsigned char *m,
                                                           const unsigned char *c,
                                                           const unsigned char *mac,
                                                           unsigned long long clen,
                                                           const unsigned char *n,
                                                           const unsigned char *pk,
                                                           const unsigned char *sk)
              __attribute__ ((warn_unused_result));
  
  /* -- Precomputation interface -- */
  
  SODIUM_EXPORT
  int crypto_box_curve25519xchacha20poly1305_beforenm(unsigned char *k,
                                                      const unsigned char *pk,
                                                      const unsigned char *sk)
              __attribute__ ((warn_unused_result));
  
  SODIUM_EXPORT
  int crypto_box_curve25519xchacha20poly1305_easy_afternm(unsigned char *c,
                                                          const unsigned char *m,
                                                          unsigned long long mlen,
                                                          const unsigned char *n,
                                                          const unsigned char *k);
  
  SODIUM_EXPORT
  int crypto_box_curve25519xchacha20poly1305_open_easy_afternm(unsigned char *m,
                                                               const unsigned char *c,
                                                               unsigned long long clen,
                                                               const unsigned char *n,
                                                               const unsigned char *k)
              __attribute__ ((warn_unused_result));
  
  SODIUM_EXPORT
  int crypto_box_curve25519xchacha20poly1305_detached_afternm(unsigned char *c,
                                                              unsigned char *mac,
                                                              const unsigned char *m,
                                                              unsigned long long mlen,
                                                              const unsigned char *n,
                                                              const unsigned char *k);
  
  SODIUM_EXPORT
  int crypto_box_curve25519xchacha20poly1305_open_detached_afternm(unsigned char *m,
                                                                   const unsigned char *c,
                                                                   const unsigned char *mac,
                                                                   unsigned long long clen,
                                                                   const unsigned char *n,
                                                                   const unsigned char *k)
              __attribute__ ((warn_unused_result));
  
  /* -- Ephemeral SK interface -- */
  
  #define crypto_box_curve25519xchacha20poly1305_SEALBYTES \
      (crypto_box_curve25519xchacha20poly1305_PUBLICKEYBYTES + \
       crypto_box_curve25519xchacha20poly1305_MACBYTES)
  
  SODIUM_EXPORT
  size_t crypto_box_curve25519xchacha20poly1305_sealbytes(void);
  
  SODIUM_EXPORT
  int crypto_box_curve25519xchacha20poly1305_seal(unsigned char *c,
                                                  const unsigned char *m,
                                                  unsigned long long mlen,
                                                  const unsigned char *pk);
  
  SODIUM_EXPORT
  int crypto_box_curve25519xchacha20poly1305_seal_open(unsigned char *m,
                                                       const unsigned char *c,
                                                       unsigned long long clen,
                                                       const unsigned char *pk,
                                                       const unsigned char *sk)
              __attribute__ ((warn_unused_result));
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif
  