gnutls_x509_crt_get_basic_constraints - This function returns the
certificate basic constraints
int gnutls_x509_crt_get_basic_constraints(gnutls_x509_crt_t cert,
unsigned int * critical, int * ca, int * pathlen);
should contain a gnutls_x509_crt_t structure
unsigned int * critical
will be non zero if the extension is marked as critical
int * ca pointer to output integer indicating CA status, may be
NULL, value is 1 if the certificate CA flag is set, 0
int * pathlen
pointer to output integer indicating path length (may be
NULL), non-negative values indicate a present
pathLenConstraint field and the actual value, -1 indicate
that the field is absent.
This function will read the certificate’s basic constraints, and return
the certificates CA status. It reads the basicConstraints X.509
If the certificate is a CA a positive value will be returned, or zero
if the certificate does not have CA flag set. A negative value may be
returned in case of errors. If the certificate does not contain the
basicConstraints extension GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will
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