.\"	$OpenBSD: d2i_AUTHORITY_KEYID.3,v 1.1 2016/12/28 20:36:33 schwarze Exp $
.\"
.\" Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
.\"
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.Dd $Mdocdate: December 28 2016 $
.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