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X509_CHECK_CA(3) FreeBSD Library Functions Manual X509_CHECK_CA(3) NAME X509_check_ca - check whether a certificate is a CA certificate SYNOPSIS #include <openssl/x509v3.h> int X509_check_ca(X509 *cert); DESCRIPTION The X509_check_ca() function checks whether the given certificate is a CA certificate, that is, whether it can be used to sign other certificates. RETURN VALUES If cert is a CA certificate, a non-zero value is returned; 0 otherwise. The following return values identify specific kinds of CA certificates: 1 an X.509 v3 CA certificate with basicConstraints extension CA:TRUE 3 a self-signed X.509 v1 certificate 4 a certificate with keyUsage extension with bit keyCertSign set, but without basicConstraints 5 a certificate with an outdated Netscape Certificate Type extension telling that it is a CA certificate SEE ALSO BASIC_CONSTRAINTS_new(3), EXTENDED_KEY_USAGE_new(3), X509_check_issued(3), X509_check_purpose(3), X509_EXTENSION_new(3), X509_new(3), X509_verify_cert(3) HISTORY X509_check_ca() first appeared in OpenSSL 0.9.7f and has been available since OpenBSD 3.8. BUGS If X509_check_ca() fails to cache X509v3 extension values, the return value may be incorrect. An application should call X509_check_purpose(3) with a purpose argument of -1, ensuring that the X509v3 extensions are cached, before calling X509_check_ca(). FreeBSD 14.1-RELEASE-p8 May 10, 2022 FreeBSD 14.1-RELEASE-p8