datum */
int set_datum_fd(gnutls_datum_t* d, int fd);
-/* read the file indicated (by na1me) in the fname parameter. store
+/* read the file indicated (by name) in the fname parameter. store
its entire contents in a single datum. */
int set_datum_file(gnutls_datum_t* d, const char* fname);
/* return 0 if userid matches the monkeysphere spec for ssh host user IDs */
int validate_ssh_host_userid(const char* userid);
+
+/* how many bytes will it take to write out this datum in OpenPGP MPI form? */
+size_t get_openpgp_mpi_size(gnutls_datum_t* d);
+
+/* write the MPI stored in gnutls_datum_t to file descriptor fd: */
+int write_openpgp_mpi_to_fd(int fd, gnutls_datum_t* d);