X509_CHECK_CA
Section: OpenSSL (3)
Updated: 2020-07-28
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NAME
X509_check_ca - check if given certificate is CA certificate
SYNOPSIS
#include <openssl/x509v3.h>
int X509_check_ca(X509 *cert);
DESCRIPTION
This function checks if given certificate is
CA certificate (can be used
to sign other certificates).
RETURN VALUES
Function return 0, if it is not
CA certificate, 1 if it is proper X509v3
CA certificate with
basicConstraints extension
CA:TRUE,
3, if it is self-signed X509 v1 certificate, 4, if it is certificate with
keyUsage extension with bit
keyCertSign set, but without
basicConstraints, and 5 if it has outdated Netscape Certificate Type
extension telling that it is
CA certificate.
Actually, any non-zero value means that this certificate could have been
used to sign other certificates.
SEE ALSO
X509_verify_cert(3),
X509_check_issued(3),
X509_check_purpose(3)
COPYRIGHT
Copyright 2015-2018 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
<https://www.openssl.org/source/license.html>.