bionic (3) X509_check_ca.3ssl.gz

Provided by: libssl-doc_1.1.1-1ubuntu2.1~18.04.23_all bug

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       with keyUsage extension with bit keyCertSign set, but without basicConstraints, and 5 if it has outdated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 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>.