void keytag_init(struct TagPacket *pkt, struct KFile *comm, struct KFile *tag);
int keytag_recv(struct TagPacket *pkt, uint8_t *tag, size_t len);
void keytag_init(struct TagPacket *pkt, struct KFile *comm, struct KFile *tag);
int keytag_recv(struct TagPacket *pkt, uint8_t *tag, size_t len);