This function will return certificates CA status, by reading the
basicConstraints X.509 extension (126.96.36.199). If the certificate
is a CA a positive value will be returned, or (0) if the
certificate does not have CA flag set.
Use gnutls_x509_crt_get_basic_constraints() if you want to read
the pathLenConstraint field too.
If the certificate is a CA a positive value will be returned, or
(0) if the certificate does not have CA flag set. A negative
error code may be returned in case of errors. If the certificate
does not contain the basicConstraints extension
GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.
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gnutls 3.7.2 gnutls_x509_crt_get_ca_status(3)