Function libsodium_sys::crypto_sign_ed25519_detached

pub unsafe extern fn crypto_sign_ed25519_detached(sig: *mut [u8; 64],
                                                  siglen: *mut c_ulonglong,
                                                  m: *const u8,
                                                  mlen: c_ulonglong,
                                                  sk: *const [u8; 64])
                                                  -> c_int