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.\" $OpenBSD: d2i_AUTHORITY_KEYID.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_AUTHORITY_KEYID 3
.Os
.Sh NAME
.Nm d2i_AUTHORITY_KEYID ,
.Nm i2d_AUTHORITY_KEYID
.Nd decode and encode X.509 authority key identifiers
.Sh SYNOPSIS
.In openssl/x509v3.h
.Ft AUTHORITY_KEYID *
.Fo d2i_AUTHORITY_KEYID
.Fa "AUTHORITY_KEYID **val_out"
.Fa "const unsigned char **der_in"
.Fa "long length"
.Fc
.Ft int
.Fo i2d_AUTHORITY_KEYID
.Fa "AUTHORITY_KEYID *val_in"
.Fa "unsigned char **der_out"
.Fc
.Sh DESCRIPTION
.Fn d2i_AUTHORITY_KEYID
and
.Fn i2d_AUTHORITY_KEYID
decode and encode an ASN.1
.Vt AuthorityKeyIdentifier
structure defined in RFC 5280 section 4.2.1.1.
For details about the semantics, examples, caveats, and bugs, see
.Xr ASN1_item_d2i 3 .
.Sh RETURN VALUES
.Fn d2i_AUTHORITY_KEYID
returns an
.Vt AUTHORITY_KEYID
object or
.Dv NULL
if an error occurs.
.Pp
.Fn i2d_AUTHORITY_KEYID
returns the number of bytes successfully encoded or a negative value
if an error occurs.
.Sh SEE ALSO
.Xr ASN1_item_d2i 3 ,
.Xr AUTHORITY_KEYID_new 3 ,
.Xr X509_EXTENSION_new 3
.Sh STANDARDS
RFC 5280: Internet X.509 Public Key Infrastructure Certificate and
Certificate Revocation List (CRL) Profile:
.Bl -dash -compact
.It
section 4.2.1.1: Certificate Extensions: Authority Key Identifier
.It
section 5.2.1: CRL Extensions: Authority Key Identifier
.El
.Sh HISTORY
.Fn d2i_AUTHORITY_KEYID
and
.Fn i2d_AUTHORITY_KEYID
first appeared in OpenSSL 0.9.2b and have been available since
.Ox 2.6 .
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