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