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.TH LIBKECCAK_HMAC_RESET 3 LIBKECCAK
.SH NAME
libkeccak_hmac_reset - Reinitialise a HMAC-hashing state
.SH SYNOPSIS
.nf
#include <libkeccak.h>
int libkeccak_hmac_reset(struct libkeccak_hmac_state *\fIstate\fP, const void *\fIkey\fP, size_t \fIkey_length\fP);
.fi
.PP
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)
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