int gnutls_x509_crt_get_subject_key_id(gnutls_x509_crt_t cert, void * ret, size_t * ret_size, unsigned int * critical);
ARGUMENTS
gnutls_x509_crt_t cert
should contain a gnutls_x509_crt_t structure
void * ret
The place where the identifier will be copied
size_t * ret_size
Holds the size of the result field.
unsigned int * critical
will be non zero if the extension is marked as critical (may be null)
DESCRIPTION
This function will return the X.509v3 certificate's subject key identifier.
This is obtained by the X.509 Subject Key identifier extension
field (2.5.29.14).
RETURNS
On success, GNUTLS_E_SUCCESS is returned, otherwise a
negative error value.and a negative value in case of an error.