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#ifndef crypto_kdf_hkdf_sha256_H
#define crypto_kdf_hkdf_sha256_H
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include "crypto_kdf.h"
#include "crypto_auth_hmacsha256.h"
#include "export.h"
#ifdef __cplusplus
# ifdef __GNUC__
# pragma GCC diagnostic ignored "-Wlong-long"
# endif
extern "C" {
#endif
#define crypto_kdf_hkdf_sha256_KEYBYTES crypto_auth_hmacsha256_BYTES
SODIUM_EXPORT
size_t crypto_kdf_hkdf_sha256_keybytes(void);
#define crypto_kdf_hkdf_sha256_BYTES_MIN 0U
SODIUM_EXPORT
size_t crypto_kdf_hkdf_sha256_bytes_min(void);
#define crypto_kdf_hkdf_sha256_BYTES_MAX (0xff * crypto_auth_hmacsha256_BYTES)
SODIUM_EXPORT
size_t crypto_kdf_hkdf_sha256_bytes_max(void);
SODIUM_EXPORT
int crypto_kdf_hkdf_sha256_extract(unsigned char prk[crypto_kdf_hkdf_sha256_KEYBYTES],
const unsigned char *salt, size_t salt_len,
const unsigned char *ikm, size_t ikm_len)
__attribute__ ((nonnull(4)));
SODIUM_EXPORT
void crypto_kdf_hkdf_sha256_keygen(unsigned char prk[crypto_kdf_hkdf_sha256_KEYBYTES]);
SODIUM_EXPORT
int crypto_kdf_hkdf_sha256_expand(unsigned char *out, size_t out_len,
const char *ctx, size_t ctx_len,
const unsigned char prk[crypto_kdf_hkdf_sha256_KEYBYTES])
__attribute__ ((nonnull(1)));
/* ------------------------------------------------------------------------- */
typedef struct crypto_kdf_hkdf_sha256_state {
crypto_auth_hmacsha256_state st;
} crypto_kdf_hkdf_sha256_state;
SODIUM_EXPORT
size_t crypto_kdf_hkdf_sha256_statebytes(void);
SODIUM_EXPORT
int crypto_kdf_hkdf_sha256_extract_init(crypto_kdf_hkdf_sha256_state *state,
const unsigned char *salt, size_t salt_len)
__attribute__ ((nonnull(1)));
SODIUM_EXPORT
int crypto_kdf_hkdf_sha256_extract_update(crypto_kdf_hkdf_sha256_state *state,
const unsigned char *ikm, size_t ikm_len)
__attribute__ ((nonnull));
SODIUM_EXPORT
int crypto_kdf_hkdf_sha256_extract_final(crypto_kdf_hkdf_sha256_state *state,
unsigned char prk[crypto_kdf_hkdf_sha256_KEYBYTES])
__attribute__ ((nonnull));
#ifdef __cplusplus
}
#endif
#endif
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