SilcBool silc_id_str2id(const unsigned char *id, SilcUInt32 id_len,
                            SilcIdType type, void *ret_id,
                            SilcUInt32 ret_id_size);

    Converts ID data string to an ID. This can be used to get the
    ID out of data that has been taken for example from packet.  This
    does not allocate any memory.