.TH LIBKECCAK_CSHAKE_SUFFIX 3 LIBKECCAK
.SH NAME
libkeccak_cshake_suffix - Get message suffix for cSHAKE hashing
.SH SYNOPSIS
.nf
#include <libkeccak.h>

const char *libkeccak_cshake_suffix(size_t \fInlen\fP, size_t \fIslen\fP);
.fi
.PP
Link with
.IR -lkeccak .
.SH DESCRIPTION
The
.BR libkeccak_cshake_suffix ()
function returns a string of '1':s and '0':s
representing the bits the the message suffixed
that shall be used.
Canonically, the values of the
.I nlen
and
.I slen
parameters shall be the length of the cSHAKE
function-name bit-string and the cSHAKE
customisation bit-string, however, the function
will only check whether these values are zero
or non-zero.
.SH RETURN VALUES
The
.BR libkeccak_cshake_suffix ()
function returns a statically allocated,
read-only, message suffix bit-string
that shall be used.
.SH ERRORS
The
.BR libkeccak_cshake_suffix ()
function cannot fail.
.SH SEE ALSO
.BR libkeccak_spec_cshake (3),
.BR libkeccak_generalised_spec_initialise (3),
.BR libkeccak_state_initialise (3),
.BR libkeccak_cshake_initialise (3),
.BR libkeccak_fast_digest (3),
.BR libkeccak_zerocopy_digest (3),
.BR libkeccak_digest (3)