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+.\"	$OpenBSD: X509_check_issued.3,v 1.1 2016/12/05 15:56:46 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:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    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/)"
+.\"
+.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+.\"    endorse or promote products derived from this software without
+.\"    prior written permission. For written permission, please contact
+.\"    openssl-core@openssl.org.
+.\"
+.\" 5. Products derived from this software may not be called "OpenSSL"
+.\"    nor may "OpenSSL" appear in their names without prior written
+.\"    permission of the OpenSSL Project.
+.\"
+.\" 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/)"
+.\"
+.\" 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: December 5 2016 $
+.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 VALUE
+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