multi: move mockWalletController, mockSecretKeyRing to lntest/mock

lntest/mock/secretkeyring.go

@@ -0,0 +1,56 @@
+package mock
+
+import (
+	"github.com/btcsuite/btcd/btcec"
+
+	"github.com/lightningnetwork/lnd/keychain"
+)
+
+// SecretKeyRing is a mock implementation of the SecretKeyRing interface.
+type SecretKeyRing struct {
+	RootKey *btcec.PrivateKey
+}
+
+// DeriveNextKey currently returns dummy values.
+func (s *SecretKeyRing) DeriveNextKey(keyFam keychain.KeyFamily) (
+	keychain.KeyDescriptor, error) {
+
+	return keychain.KeyDescriptor{
+		PubKey: s.RootKey.PubKey(),
+	}, nil
+}
+
+// DeriveKey currently returns dummy values.
+func (s *SecretKeyRing) DeriveKey(keyLoc keychain.KeyLocator) (keychain.KeyDescriptor,
+	error) {
+	return keychain.KeyDescriptor{
+		PubKey: s.RootKey.PubKey(),
+	}, nil
+}
+
+// DerivePrivKey currently returns dummy values.
+func (s *SecretKeyRing) DerivePrivKey(keyDesc keychain.KeyDescriptor) (*btcec.PrivateKey,
+	error) {
+	return s.RootKey, nil
+}
+
+// ECDH currently returns dummy values.
+func (s *SecretKeyRing) ECDH(_ keychain.KeyDescriptor, pubKey *btcec.PublicKey) ([32]byte,
+	error) {
+
+	return [32]byte{}, nil
+}
+
+// SignDigest signs the passed digest and ignores the KeyDescriptor.
+func (s *SecretKeyRing) SignDigest(_ keychain.KeyDescriptor,
+	digest [32]byte) (*btcec.Signature, error) {
+
+	return s.RootKey.Sign(digest[:])
+}
+
+// SignDigestCompact signs the passed digest.
+func (s *SecretKeyRing) SignDigestCompact(_ keychain.KeyDescriptor,
+	digest [32]byte) ([]byte, error) {
+
+	return btcec.SignCompact(btcec.S256(), s.RootKey, digest[:], true)
+}