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.\" $OpenBSD: X509_check_issued.3,v 1.3 2018/03/22 17:11:04 schwarze Exp $
.\" OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
.\"
.\" This file was written by Victor B. Wagner <vitus@cryptocom.ru>.
.\" Copyright (c) 2015 The OpenSSL Project. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
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.\" notice, this list of conditions and the following disclaimer.
.\"
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.\" notice, this list of conditions and the following disclaimer in
.\" the documentation and/or other materials provided with the
.\" distribution.
.\"
.\" 3. All advertising materials mentioning features or use of this
.\" software must display the following acknowledgment:
.\" "This product includes software developed by the OpenSSL Project
.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
.\"
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.\" prior written permission. For written permission, please contact
.\" openssl-core@openssl.org.
.\"
.\" 5. Products derived from this software may not be called "OpenSSL"
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.\" permission of the OpenSSL Project.
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.\" 6. Redistributions of any form whatsoever must retain the following
.\" acknowledgment:
.\" "This product includes software developed by the OpenSSL Project
.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.Dd $Mdocdate: March 22 2018 $
.Dt X509_CHECK_ISSUED 3
.Os
.Sh NAME
.Nm X509_check_issued
.Nd check whether a certificate was issued using a given CA certificate
.Sh SYNOPSIS
.In openssl/x509v3.h
.Ft int
.Fo X509_check_issued
.Fa "X509 *issuer"
.Fa "X509 *subject"
.Fc
.Sh DESCRIPTION
This function checks whether the certificate
.Fa subject
was issued using the CA certificate
.Fa issuer .
It does the following checks:
.Bl -bullet
.It
match the issuer field of
.Fa subject
against the subject field of
.Fa issuer
.It
if
.Sy authorityKeyIdentifier
is present in the
.Fa subject
certificate,
compare it to the
.Sy subjectKeyIdentifier
of
.Fa issuer
.It
check the
.Sy keyUsage
field of
.Fa issuer .
.El
.Sh RETURN VALUES
This function returns
.Dv X509_V_OK
if the certificate
.Fa subject
is issued by
.Fa issuer ,
or some
.Dv X509_V_ERR*
constant to indicate an error.
.Sh SEE ALSO
.Xr X509_check_ca 3 ,
.Xr X509_verify_cert 3
.Sh HISTORY
.Fn X509_check_issued
first appeared in OpenSSL 0.9.6 and has been available since
.Ox 2.9 .
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