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.TH LIBKECCAK_HMAC_SET_KEY 3 LIBKECCAK
.SH NAME
libkeccak_hmac_set_key - Changes key for a the HMAC-hashing state
.SH SYNOPSIS
.LP
.nf
#include <libkeccak.h>
.P
int
libkeccak_hmac_set_key(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_set_key ()
function sets the key for a HMAC-hashing state without reseting
the state of the underlaying hashing-algorithm.
.I key_length
is the length of the key in bits.
.SH RETURN VALUES
The
.BR libkeccak_hmac_set_key ()
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_set_key ()
function may fail for any specified for the function
.BR realloc (3).
.SH SEE ALSO
.BR libkeccak_hmac_create (3),
.BR libkeccak_hmac_initialise (3),
.BR libkeccak_hmac_reset (3)
.SH BUGS
Please report bugs to https://github.com/maandree/libkeccak/issues or to
maandree@kth.se
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