Function mbedtls_ssl_cookie_write 

pub unsafe extern "C" fn mbedtls_ssl_cookie_write(
    ctx: *mut c_void,
    p: *mut *mut c_uchar,
    end: *mut c_uchar,
    info: *const c_uchar,
    ilen: usize,
) -> c_int

\brief Generate cookie, see \c mbedtls_ssl_cookie_write_t