gnutls_x509_crq_get_attribute_by_oid - This function will get an
attribute of the request
int gnutls_x509_crq_get_attribute_by_oid(gnutls_x509_crq_t crq, const
char * oid, int indx, 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
int indx In case multiple same OIDs exist in the attribute list,
this specifies which to send. Use zero to get the first
void * buf a pointer to a structure to hold the attribute data (may be
size_t * sizeof_buf
initially holds the size of buf
This function will return the attribute in the certificate request
specified by the given Object ID. The attribute will be DER encoded.
On success, GNUTLS_E_SUCCESS is returned, otherwise a negative error
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