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+.\"     $OpenBSD: X509_check_ca.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, 2016 The OpenSSL Project.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
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+.\"
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+.Dd $Mdocdate: December 5 2016 $
+.Dt X509_CHECK_CA 3
+.Os
+.Sh NAME
+.Nm X509_check_ca
+.Nd check whether a certificate is a CA certificate
+.Sh SYNOPSIS
+.In openssl/x509v3.h
+.Ft int
+.Fo X509_check_ca
+.Fa "X509 *cert"
+.Fc
+.Sh DESCRIPTION
+This function checks whether the given certificate is a CA certificate,
+that is, whether it can be used to sign other certificates.
+.Sh RETURN VALUE
+This functions returns non-zero if
+.Fa cert
+is a CA certificate or 0 otherwise.
+.Pp
+The following return values identify specific kinds of CA certificates:
+.Bl -tag -width 2n
+.It 1
+an X.509 v3 CA certificate with
+.Sy basicConstraints
+extension CA:TRUE
+.It 3
+a self-signed X.509 v1 certificate
+.It 4
+a certificate with
+.Sy keyUsage
+extension with bit
+.Sy keyCertSign
+set, but without
+.Sy basicConstraints
+.It 5
+a certificate with an outdated Netscape Certificate Type extension telling
+that it is a CA certificate
+.El
+.Sh SEE ALSO
+.Xr X509_check_issued 3 ,
+.Xr X509_check_purpose 3 ,
+.Xr X509_verify_cert 3