.TH LIBSHA2_INIT 3 2019-02-09 libjson
.SH NAME
libsha2_init \- Initialises hashing with a SHA 2 algorithm
.SH SYNOPSIS
.nf
#include <libsha2.h>

enum libsha2_algorithm {
	LIBSHA2_224,     /* SHA-224     */
	LIBSHA2_256,     /* SHA-256     */
	LIBSHA2_384,     /* SHA-384     */
	LIBSHA2_512,     /* SHA-512     */
	LIBSHA2_512_224, /* SHA-512/224 */
	LIBSHA2_512_256  /* SHA-512/256 */
};

int libsha2_init(struct libsha2_state *restrict \fIstate\fP, enum libsha2_algorithm \fIalgorithm\fP);
.fi
.PP
Link with
.IR \-lsha2 .
.SH DESCRIPTION
The
.BR libsha2_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 libsha2_init ()
function returns 0 upon successful completion,
otherwise -1 is returned and
.I errno
is set appropriately.
.SH ERRORS
The
.BR libsha2_init ()
function will fail if:
.TP
.B EINVAL
.I algorithm
is not a valid
.B enum libsha2_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 libsha2_digest (3),
.BR libsha2_marshal (3),
.BR libsha2_sum_fd (3),
.BR libsha2_unmarshal (3),
.BR libsha2_update (3)