1X509_CHECK_CA(3)                    OpenSSL                   X509_CHECK_CA(3)
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NAME

6       X509_check_ca - check if given certificate is CA certificate
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SYNOPSIS

9        #include <openssl/x509v3.h>
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11        int X509_check_ca(X509 *cert);
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DESCRIPTION

14       This function checks if given certificate is CA certificate (can be
15       used to sign other certificates).
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RETURN VALUES

18       Function return 0, if it is not CA certificate, 1 if it is proper
19       X509v3 CA certificate with basicConstraints extension CA:TRUE, 3, if it
20       is self-signed X509 v1 certificate, 4, if it is certificate with
21       keyUsage extension with bit keyCertSign set, but without
22       basicConstraints, and 5 if it has outdated Netscape Certificate Type
23       extension telling that it is CA certificate.
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25       Actually, any nonzero value means that this certificate could have been
26       used to sign other certificates.
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SEE ALSO

29       X509_verify_cert(3), X509_check_issued(3), X509_check_purpose(3)
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32       Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
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34       Licensed under the OpenSSL license (the "License").  You may not use
35       this file except in compliance with the License.  You can obtain a copy
36       in the file LICENSE in the source distribution or at
37       <https://www.openssl.org/source/license.html>.
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411.1.1q                            2022-07-07                  X509_CHECK_CA(3)
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