text: #ifndef crypto_auth_hmacsha256_H
  #define crypto_auth_hmacsha256_H
  
  #include <stddef.h>
  #include "crypto_hash_sha256.h"
  #include "export.h"
  
  #ifdef __cplusplus
  # if __GNUC__
  #  pragma GCC diagnostic ignored "-Wlong-long"
  # endif
  extern "C" {
  #endif
  
  #define crypto_auth_hmacsha256_BYTES 32U
  SODIUM_EXPORT
  size_t crypto_auth_hmacsha256_bytes(void);
  
  #define crypto_auth_hmacsha256_KEYBYTES 32U
  SODIUM_EXPORT
  size_t crypto_auth_hmacsha256_keybytes(void);
  
  SODIUM_EXPORT
  int crypto_auth_hmacsha256(unsigned char *out,
                             const unsigned char *in,
                             unsigned long long inlen,
                             const unsigned char *k);
  
  SODIUM_EXPORT
  int crypto_auth_hmacsha256_verify(const unsigned char *h,
                                    const unsigned char *in,
                                    unsigned long long inlen,
                                    const unsigned char *k);
  
  /* ------------------------------------------------------------------------- */
  
  typedef struct crypto_auth_hmacsha256_state {
      crypto_hash_sha256_state ictx;
      crypto_hash_sha256_state octx;
  } crypto_auth_hmacsha256_state;
  SODIUM_EXPORT
  size_t crypto_auth_hmacsha256_statebytes(void);
  
  SODIUM_EXPORT
  int crypto_auth_hmacsha256_init(crypto_auth_hmacsha256_state *state,
                                  const unsigned char *key,
                                  size_t keylen);
  
  SODIUM_EXPORT
  int crypto_auth_hmacsha256_update(crypto_auth_hmacsha256_state *state,
                                    const unsigned char *in,
                                    unsigned long long inlen);
  
  SODIUM_EXPORT
  int crypto_auth_hmacsha256_final(crypto_auth_hmacsha256_state *state,
                                   unsigned char *out);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif
  