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-.TH LIBKECCAK_HMAC_UPDATE 3 LIBKECCAK
-.SH NAME
-libkeccak_hmac_update - Partially HMAC-hash a message with erasure
-.SH SYNOPSIS
-.nf
-#include <libkeccak.h>
-
-int libkeccak_hmac_update(libkeccak_state_t *\fIstate\fP, const void *\fImsg\fP, size_t \fImsglen\fP);
-.fi
-.PP
-Link with
-.IR -lkeccak .
-.SH DESCRIPTION
-The
-.BR libkeccak_hmac_update ()
-function continues (or starts) HMAC-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
-The
-.BR libkeccak_hmac_update ()
-function may reallocate the state's message chunk buffer.
-When doing so, it attempts to do so as securely as possible,
-rather than as fast as possible.
-.SH RETURN VALUES
-The
-.BR libkeccak_hmac_update ()
-function returns 0 upon successful completion. On error,
--1 is returned and
-.I errno
-is set to describe the error.
-.SH ERRORS
-The
-.BR libkeccak_hmac_update ()
-function may fail for any reason specified by the function
-.BR malloc (3).
-.SH NOTES
-Neither parameter by be
-.I NULL
-or 0.
-.SH SEE ALSO
-.BR libkeccak_hmac_create (3),
-.BR libkeccak_hmac_initialise (3),
-.BR libkeccak_hmac_digest (3),
-.BR libkeccak_hmac_fast_update (3)