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-.TH LIBKECCAK_ZEROCOPY_UPDATE 3 LIBKECCAK
-.SH NAME
-libkeccak_zerocopy_update - Partially hash a message without copying
-.RB ( ADVANCED )
-.SH SYNOPSIS
-.nf
-#include <libkeccak.h>
-
-void libkeccak_zerocopy_update(struct libkeccak_state *\fIstate\fP, const void *\fImsg\fP, size_t \fImsglen\fP);
-.fi
-.PP
-Link with
-.IR -lkeccak .
-.SH DESCRIPTION
-The
-.BR libkeccak_zerocopy_update ()
-function continues (or starts) hashing a message.
-The current state of the hashing is stored in
-.IR *state ,
-and will be updated. The message specified by the
-.I msg
-parameter with the byte-size specified by the
-.I msglen
-parameter, will be hashed.
-.PP
-As a restriction specific to the
-.BR libkeccak_zerocopy_update ()
-function, the
-.I msglen
-argument must be an integer multiple of the bitrate
-divided by eight. This is returned by the
-.BR libkeccak_zerocopy_chunksize (3)
-function. The
-.BR libkeccak_update (3)
-or
-.BR libkeccak_fast_update (3)
-functions can be used to avoid this restriction,
-but these, unlike the
-.BR libkeccak_zerocopy_update ()
-function, will copy the message and move around
-copied data.
-.SH RETURN VALUES
-The
-.BR libkeccak_zerocopy_update ()
-function does not return a value.
-.SH ERRORS
-The
-.BR libkeccak_zerocopy_update ()
-function cannot fail.
-.SH NOTES
-Neither parameter by be
-.I NULL
-or 0.
-.PP
-It is safe call the
-.BR libkeccak_zerocopy_update ()
-function before the
-.BR libkeccak_update (3),
-.BR libkeccak_fast_update (3)
-.BR libkeccak_digest (3)
-and
-.BR libkeccak_fast_digest (3)
-functions with the same
-.I state
-argument. However, calling the
-.BR libkeccak_zerocopy_update ()
-function after the
-.BR libkeccak_update (3)
-or
-.BR libkeccak_fast_update (3)
-functions may cause the message
-to be misread.
-.SH NOTES
-For cSHAKE, the
-.BR libkeccak_cshake_initialise (3),
-must be called, once, immediately after
-state initialisation; before the first
-call to the
-.BR libkeccak_zerocopy_update ()
-function.
-.SH SEE ALSO
-.BR libkeccak_state_initialise (3),
-.BR libkeccak_cshake_initialise (3),
-.BR libkeccak_zerocopy_chunksize (3),
-.BR libkeccak_fast_update (3),
-.BR libkeccak_update (3),
-.BR libkeccak_fast_digest (3),
-.BR libkeccak_zerocopy_digest (3),
-.BR libkeccak_digest (3)