should contain a gnutls_x509_crq_t type
Specifies which extension number to get. Use (0) to
get the first one.
void * data a pointer to a structure to hold the data (may be
size_t * sizeof_data
initially holds the size of oid
This function will return the requested extension data in the
certificate. The extension data will be stored as a string in
the provided buffer.
Use gnutls_x509_crq_get_extension_info() to extract the OID and
critical flag. Use gnutls_x509_crq_get_extension_by_oid()
instead, if you want to get data indexed by the extension OID
rather than sequence.
On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a
negative error code in case of an error. If your have reached
the last extension available
GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.
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