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.\" $OpenBSD: d2i_PKEY_USAGE_PERIOD.3,v 1.2 2018/03/21 16:09:51 schwarze Exp $
.\"
.\" Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: March 21 2018 $
.Dt D2I_PKEY_USAGE_PERIOD 3
.Os
.Sh NAME
.Nm d2i_PKEY_USAGE_PERIOD ,
.Nm i2d_PKEY_USAGE_PERIOD
.Nd decode and encode X.509 key usage period extensions
.Sh SYNOPSIS
.In openssl/x509v3.h
.Ft PKEY_USAGE_PERIOD *
.Fo d2i_PKEY_USAGE_PERIOD
.Fa "PKEY_USAGE_PERIOD **val_out"
.Fa "const unsigned char **der_in"
.Fa "long length"
.Fc
.Ft int
.Fo i2d_PKEY_USAGE_PERIOD
.Fa "PKEY_USAGE_PERIOD *val_in"
.Fa "unsigned char **der_out"
.Fc
.Sh DESCRIPTION
.Fn d2i_PKEY_USAGE_PERIOD
and
.Fn i2d_PKEY_USAGE_PERIOD
decode and encode an ASN.1
.Vt PrivateKeyUsagePeriod
structure defined in RFC 3280 section 4.2.1.4.
For details about the semantics, examples, caveats, and bugs, see
.Xr ASN1_item_d2i 3 .
.Sh RETURN VALUES
.Fn d2i_PKEY_USAGE_PERIOD
returns a
.Vt PKEY_USAGE_PERIOD
object or
.Dv NULL
if an error occurs.
.Pp
.Fn i2d_PKEY_USAGE_PERIOD
returns the number of bytes successfully encoded or a negative value
if an error occurs.
.Sh SEE ALSO
.Xr ASN1_item_d2i 3 ,
.Xr PKEY_USAGE_PERIOD_new 3 ,
.Xr X509_EXTENSION_new 3
.Sh STANDARDS
RFC 3280: Internet X.509 Public Key Infrastructure Certificate and
Certificate Revocation List (CRL) Profile,
section 4.2.1.4: Private Key Usage Period
.Pp
RFC 3280 was obsoleted by RFC 5280; see
.Xr PKEY_USAGE_PERIOD_new 3
for details.
.Sh HISTORY
.Fn d2i_PKEY_USAGE_PERIOD
and
.Fn i2d_PKEY_USAGE_PERIOD
first appeared in OpenSSL 0.9.2b and have been available since
.Ox 2.6 .
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