.TH LIBKECCAK_HMAC_RESET 3 LIBKECCAK
.SH NAME
libkeccak_hmac_reset - Reinitialise a HMAC-hashing state
.SH SYNOPSIS
.LP
.nf
#include <libkeccak.h>
.P
int
libkeccak_hmac_reset(libkeccak_hmac_state_t *\fIstate\fP, const char *\fIkey\fP,
                     size_t \fIkey_length\fP);
.fi
.P
Link with
.IR -lkeccak .
.SH DESCRIPTION
The
.BR libkeccak_hmac_reset ()
function reinitialises an HMAC-hashing state with a new key.
.I key_length
is the length of the key in bits. If
.I key
is
.IR NULL ,
the key remains unchanged.
.SH RETURN VALUES
The
.BR libkeccak_hmac_reset ()
function returns 0 successful completion.
On error -1 is returned and
.I errno
is set to describe the error.
.SH ERRORS
The
.BR libkeccak_hmac_reset ()
function may fail for any specified for the functions
.BR malloc (3)
and
.BR realloc (3).
.SH SEE ALSO
.BR libkeccak_hmac_create (3),
.BR libkeccak_hmac_initialise (3),
.BR libkeccak_hmac_set_key (3),
.BR libkeccak_hmac_wipe (3),
.BR libkeccak_hmac_fast_free (3),
.BR libkeccak_hmac_free (3),
.BR libkeccak_hmac_fast_destroy (3),
.BR libkeccak_hmac_destroy (3)
.SH BUGS
Please report bugs to https://github.com/maandree/libkeccak/issues or to
maandree@kth.se