ssh: implement CryptoPublicKey on sk keys

This commit implements the CryptoPublicKey interface for the
skECDSAPublicKey and skEd25519PublicKey types.

Fixes golang/go#62518

Change-Id: I2b8ac89196fbb3614bf5c675127bed23f1cf6b26
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/526875
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Auto-Submit: Nicola Murino <nicola.murino@gmail.com>
Reviewed-by: Nicola Murino <nicola.murino@gmail.com>

Author: maraino

Diff for: ssh/keys.go

@@ -904,6 +904,10 @@ func (k *skECDSAPublicKey) Verify(data []byte, sig *Signature) error {
 	return errors.New("ssh: signature did not verify")
 }
 
+func (k *skECDSAPublicKey) CryptoPublicKey() crypto.PublicKey {
+	return &k.PublicKey
+}
+
 type skEd25519PublicKey struct {
 	// application is a URL-like string, typically "ssh:" for SSH.
 	// see openssh/PROTOCOL.u2f for details.
@@ -1000,6 +1004,10 @@ func (k *skEd25519PublicKey) Verify(data []byte, sig *Signature) error {
 	return nil
 }
 
+func (k *skEd25519PublicKey) CryptoPublicKey() crypto.PublicKey {
+	return k.PublicKey
+}
+
 // NewSignerFromKey takes an *rsa.PrivateKey, *dsa.PrivateKey,
 // *ecdsa.PrivateKey or any other crypto.Signer and returns a
 // corresponding Signer instance. ECDSA keys must use P-256, P-384 or

Diff for: ssh/keys_test.go

@@ -726,3 +726,49 @@ func TestNewSignerWithAlgos(t *testing.T) {
 		t.Error("signer with algos created with restricted algorithms")
 	}
 }
+
+func TestCryptoPublicKey(t *testing.T) {
+	for _, priv := range testSigners {
+		p1 := priv.PublicKey()
+		key, ok := p1.(CryptoPublicKey)
+		if !ok {
+			continue
+		}
+		p2, err := NewPublicKey(key.CryptoPublicKey())
+		if err != nil {
+			t.Fatalf("NewPublicKey(CryptoPublicKey) failed for %s, got: %v", p1.Type(), err)
+		}
+		if !reflect.DeepEqual(p1, p2) {
+			t.Errorf("got %#v in NewPublicKey, want %#v", p2, p1)
+		}
+	}
+	for _, d := range testdata.SKData {
+		p1, _, _, _, err := ParseAuthorizedKey(d.PubKey)
+		if err != nil {
+			t.Fatalf("parseAuthorizedKey returned error: %v", err)
+		}
+		k1, ok := p1.(CryptoPublicKey)
+		if !ok {
+			t.Fatalf("%T does not implement CryptoPublicKey", p1)
+		}
+
+		var p2 PublicKey
+		switch pub := k1.CryptoPublicKey().(type) {
+		case *ecdsa.PublicKey:
+			p2 = &skECDSAPublicKey{
+				application: "ssh:",
+				PublicKey:   *pub,
+			}
+		case ed25519.PublicKey:
+			p2 = &skEd25519PublicKey{
+				application: "ssh:",
+				PublicKey:   pub,
+			}
+		default:
+			t.Fatalf("unexpected type %T from CryptoPublicKey()", pub)
+		}
+		if !reflect.DeepEqual(p1, p2) {
+			t.Errorf("got %#v, want %#v", p2, p1)
+		}
+	}
+}