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, and 5 if it has outdated Netscape Certificate Type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