EdX25519Key.PaperKey

edx25519.go

@@ -95,6 +95,14 @@ func (k *EdX25519Key) Signer() crypto.Signer {
 	return ed25519.PrivateKey(k.Private())
 }
 
+func (k *EdX25519Key) PaperKey() string {
+	s, err := encoding.BytesToPhrase(k.Seed()[:])
+	if err != nil {
+		panic(err)
+	}
+	return s
+}
+
 // MarshalText for encoding.TextMarshaler interface.
 func (k *EdX25519Key) MarshalText() ([]byte, error) {
 	return []byte(encoding.MustEncode(k.Seed()[:], encoding.Base64)), nil

edx25519_test.go

@@ -19,10 +19,16 @@ func TestEdX25519KeySeed(t *testing.T) {
 	require.Equal(t, sk.PrivateKey(), skOut.PrivateKey())
 	require.True(t, sk.Equal(skOut))
 
-	sk2 := keys.NewEdX25519KeyFromSeed(keys.Rand32())
+	sk2 := keys.NewEdX25519KeyFromSeed(testSeed(0x01))
 	require.False(t, sk.Equal(sk2))
 }
 
+func TestEdX25519KeyPaperKey(t *testing.T) {
+	k := keys.NewEdX25519KeyFromSeed(testSeed(0x01))
+	paperKey := k.PaperKey()
+	require.Equal(t, "absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic avoid letter advice comic", paperKey)
+}
+
 func TestEdX25519KeySignVerify(t *testing.T) {
 	signKey := keys.GenerateEdX25519Key()