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=pod
=head1 NAME
X509_check_ca - check if given certificate is CA certificate
=head1 SYNOPSIS
#include <openssl/x509v3.h>
int X509_check_ca(X509 *cert);
=head1 DESCRIPTION
This function checks if given certificate is CA certificate (can be used
to sign other certificates).
=head1 RETURN VALUES
Function return 0, if it is not CA certificate, 1 if it is proper X509v3
CA certificate with B<basicConstraints> extension CA:TRUE,
3, if it is self-signed X509 v1 certificate, 4, if it is certificate with
B<keyUsage> extension with bit B<keyCertSign> set, but without
B<basicConstraints>, and 5 if it has outdated Netscape Certificate Type
extension telling that it is CA certificate.
Actually, any nonzero value means that this certificate could have been
used to sign other certificates.
=head1 SEE ALSO
L<X509_verify_cert(3)>,
L<X509_check_issued(3)>,
L<X509_check_purpose(3)>
=head1 COPYRIGHT
Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.
=cut
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