LIBKECCAK_HMAC_SET_KEY(3)  Library Functions Manual  LIBKECCAK_HMAC_SET_KEY(3)

NAME
       libkeccak_hmac_set_key - Changes key for a the HMAC-hashing state

SYNOPSIS
       #include <libkeccak.h>

       int libkeccak_hmac_set_key(struct libkeccak_hmac_state *state, const void *key, size_t key_length);

       Link with -lkeccak.

DESCRIPTION
       The libkeccak_hmac_set_key() function sets the key for a HMAC-hashing
       state without reseting the state of the underlaying hashing-algorithm.
       key_length is the length of the key in bits.

RETURN VALUES
       The libkeccak_hmac_set_key() function returns 0 successful completion.
       On error -1 is returned and errno is set to describe the error.

ERRORS
       The libkeccak_hmac_set_key() function may fail for any specified for
       the function realloc(3).

SEE ALSO
       libkeccak_hmac_create(3), libkeccak_hmac_initialise(3),
       libkeccak_hmac_reset(3)

                                   LIBKECCAK         LIBKECCAK_HMAC_SET_KEY(3)