.\"	$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>
.\"
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.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 .