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X509_check_ca(3)                    OpenSSL                   X509_check_ca(3)



NAME
       X509_check_ca - check if given certificate is CA certificate

LIBRARY
       libcrypto, -lcrypto

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       basicConstraints, and 5 if it has outdated Netscape Certificate Type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>.



1.1.1                             2018-09-17                  X509_check_ca(3)