pub unsafe extern "C" fn libssh2_userauth_publickey_frommemory( sess: *mut LIBSSH2_SESSION, username: *const c_char, username_len: size_t, publickeydata: *const c_char, publickeydata_len: size_t, privatekeydata: *const c_char, privatekeydata_len: size_t, passphrase: *const c_char) -> c_int