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+.TH LIBSHA1_HMAC_INIT 3 2019-02-10 libsha1
+.SH NAME
+libsha1_hmac_init \- Initialises hashing with an HMAC-SHA 1/0 algorithm
+.SH SYNOPSIS
+.nf
+#include <libsha1.h>
+
+enum libsha1_algorithm {
+	LIBSHA1_0, /* SHA-0 */
+	LIBSHA1_1  /* SHA-1 */
+};
+
+int libsha1_hmac_init(struct libsha1_hmac_state *restrict \fIstate\fP, enum libsha1_algorithm \fIalgorithm\fP,
+                      const void *restrict \fIkey\fP, size_t \fIkeylen\fP);
+.fi
+.PP
+Link with
+.IR \-lsha1 .
+.SH DESCRIPTION
+The
+.BR libsha1_hmac_init ()
+function stores the selected
+.I algorithm
+in
+.I state
+and initialises
+.I state
+with the first
+.I keylen
+bits of
+.I key
+as the key.
+.SH RETURN VALUE
+The
+.BR libsha1_hmac_init ()
+function returns 0 upon successful completion,
+otherwise -1 is returned and
+.I errno
+is set appropriately.
+.SH ERRORS
+The
+.BR libsha1_hmac_init ()
+function will fail if:
+.TP
+.B EINVAL
+.I algorithm
+is not a valid
+.B enum libsha1_algorithm
+value.
+.SH EXAMPLES
+None.
+.SH APPLICATION USAGE
+None.
+.SH RATIONALE
+None.
+.SH FUTURE DIRECTIONS
+None.
+.SH NOTES
+None.
+.SH BUGS
+None.
+.SH SEE ALSO
+.BR libsha1_hmac_digest (3),
+.BR libsha1_hmac_marshal (3),
+.BR libsha1_hmac_unmarshal (3),
+.BR libsha1_hmac_update (3)