.TH LIBSHA1_INIT 3 2019-02-10 libsha1
.SH NAME
libsha1_init \- Initialises hashing with a SHA 1/0 algorithm
.SH SYNOPSIS
.nf
#include <libsha1.h>

enum libsha1_algorithm {
	LIBSHA1_0, /* SHA-0 */
	LIBSHA1_1  /* SHA-1 */
};

int libsha1_init(struct libsha1_state *restrict \fIstate\fP, enum libsha1_algorithm \fIalgorithm\fP);
.fi
.PP
Link with
.IR \-lsha1 .
.SH DESCRIPTION
The
.BR libsha1_init ()
function stores the selected
.I algorithm
in
.I state
and initialises
.I state
accordingly with the initial hashing state.
.SH RETURN VALUE
The
.BR libsha1_init ()
function returns 0 upon successful completion,
otherwise -1 is returned and
.I errno
is set appropriately.
.SH ERRORS
The
.BR libsha1_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_digest (3),
.BR libsha1_marshal (3),
.BR libsha1_sum_fd (3),
.BR libsha1_unmarshal (3),
.BR libsha1_update (3)