gnutls_x509_crq_set_attribute_by_oid - This function will set an
attribute in the request
int gnutls_x509_crq_set_attribute_by_oid(gnutls_x509_crq_t crq, const
char * oid, void * buf, size_t sizeof_buf);
should contain a gnutls_x509_crq_t structure
const char * oid
holds an Object Identified in null terminated string
void * buf a pointer to a structure that holds the attribute data
holds the size of buf
This function will set the attribute in the certificate request
specified by the given Object ID. The attribute must be be DER encoded.
On success, GNUTLS_E_SUCCESS is returned, otherwise a negative error
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