should contain a gnutls_x509_crq_t type
Specifies which attribute 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 attribute data in the
certificate request. The attribute data will be stored as a
string in the provided buffer.
Use gnutls_x509_crq_get_attribute_info() to extract the OID. Use
gnutls_x509_crq_get_attribute_by_oid() instead, if you want to
get data indexed by the attribute 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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