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+.TH LIBKECCAK_HMAC_INITIALISE 3 LIBKECCAK-%VERSION%
+.SH NAME
+libkeccak_hmac_initialise - Initialise HMAC-hashing state
+.SH SYNOPSIS
+.LP
+.nf
+#include <libkeccak.h>
+.P
+int libkeccak_hmac_initialise(libkeccak_hmac_state_t *\fIstate\fP,
+ const libkeccak_spec_t *\fIspec\fP,
+ const char *\fIkey\fP, size_t \fIkey_length\fP);
+.fi
+.P
+Link with \fI-lkeccak\fP.
+.SH DESCRIPTION
+The
+.BR libkeccak_hmac_initialise ()
+function initialises \fI*state\fP and sets the algorithm
+tuning parameters to those specified by \fI*spec\fP,
+and the key to \fIkey\fP of length \fIkey_length\fP.
+.SH RETURN VALUES
+The
+.BR libkeccak_hmac_initialise ()
+function return 0 upon successful completion.
+On error, -1 is returned and \fIerrno\fP is set to describe
+the error.
+.SH ERRORS
+The
+.BR libkeccak_hmac_initialise ()
+function may fail for any specified for the functions
+.BR malloc (3)
+and
+.BR realloc (3).
+.SH SEE ALSO
+.BR libkeccak_spec_sha3 (3),
+.BR libkeccak_spec_shake (3),
+.BR libkeccak_spec_rawshake (3),
+.BR libkeccak_spec_check (3),
+.BR libkeccak_generalised_spec_initialise (3),
+.BR libkeccak_state_initialise (3)
+.SH AUTHORS
+Principal author, Mattias Andrée. See the LICENSE file for the full
+list of authors.
+.SH BUGS
+Please report bugs to https://github.com/maandree/libkeccak/issues or to
+maandree@member.fsf.org