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#ifndef LIGHTNING_COMMON_HMAC_H
#define LIGHTNING_COMMON_HMAC_H
#include "config.h"
#include <ccan/short_types/short_types.h>
#include <ccan/structeq/structeq.h>
#include <sodium/crypto_auth_hmacsha256.h>
struct secret;
/* HMAC used by Sphinx: SHA256 */
struct hmac {
u8 bytes[crypto_auth_hmacsha256_BYTES];
};
void hmac(const void *src, size_t slen,
const void *key, size_t klen,
struct hmac *hmac);
void hmac_start(crypto_auth_hmacsha256_state *state,
const void *key, size_t klen);
void hmac_update(crypto_auth_hmacsha256_state *state,
const void *src, size_t slen);
void hmac_done(crypto_auth_hmacsha256_state *state,
struct hmac *hmac);
/* Common style: hmac to derive key using fixed string prefix. */
void subkey_from_hmac(const char *prefix,
const struct secret *base,
struct secret *key);
void towire_hmac(u8 **pptr, const struct hmac *hmac);
void fromwire_hmac(const u8 **ptr, size_t *max, struct hmac *hmac);
/* Define hmac_eq. */
STRUCTEQ_DEF(hmac, 0, bytes);
#endif /* LIGHTNING_COMMON_HMAC_H */