func (key *PrivateKey) SignTriple(t *protocol.Triple) error { var err error t.Author, err = key.AuthorID() if err != nil { return err } fingerprint, err := FingerprintTriple(t) if err != nil { return err } r, s, err := ecdsa.Sign(rand.Reader, (*ecdsa.PrivateKey)(key), fingerprint) if err != nil { return err } t.Sig = string(r.Bytes()) + string(s.Bytes()) return nil }