X509_check_ca(3) - NetBSD Manual Pages

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X509_check_ca(3)                    OpenSSL                   X509_check_ca(3)




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). The certificate must be a complete
       certificate otherwise an error is returned.


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       basicConstraints, and 5 if it has outdated Netscape Certificate Type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

       This function will also return 0 on error.

       Actually, any nonzero 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 2015-2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (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>.



3.0.15                            2024-09-03                  X509_check_ca(3)