DragonFly On-Line Manual Pages
X509_CHECK_CA(3) OpenSSL X509_CHECK_CA(3)
X509_check_ca - check if given certificate is CA certificate
int X509_check_ca(X509 *cert);
This function checks if given certificate is CA certificate (can be
used to sign other certificates).
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basicConstraints, and 5 if it has outdated Netscape Certificate Type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 nonzero value means that this certificate could have been
used to sign other certificates.
X509_verify_cert(3), X509_check_issued(3), X509_check_purpose(3)
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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
1.1.1t 2023-02-07 X509_CHECK_CA(3)