walletrpc: add test sign/verify methods

Test the introduced methods sign/verify messages for single addresses

lntest/itest/list_on_test.go

@@ -501,4 +501,8 @@ var allTestCasesTemp = []*lntemp.TestCase{
 		Name:     "custom message",
 		TestFunc: testCustomMessage,
 	},
+	{
+		Name:     "sign verify message with addr",
+		TestFunc: testSignVerifyMessageWithAddr,
+	},
 }

lntest/itest/lnd_misc_test.go

@@ -1073,3 +1073,120 @@ func assertChannelConstraintsEqual(ht *lntemp.HarnessTest,
 	require.Equal(ht, want.MaxAcceptedHtlcs, got.MaxAcceptedHtlcs,
 		"MaxAcceptedHtlcs mismatched")
 }
+
+// testSignVerifyMessageWithAddr tests signing and also verifying a signature
+// on a message with a provided address.
+func testSignVerifyMessageWithAddr(ht *lntemp.HarnessTest) {
+	// Using different nodes to sign the message and verify the signature.
+	alice, bob := ht.Alice, ht.Bob
+
+	// Test an lnd wallet created P2WKH address.
+	respAddr := alice.RPC.NewAddress(&lnrpc.NewAddressRequest{
+		Type: lnrpc.AddressType_WITNESS_PUBKEY_HASH,
+	})
+
+	aliceMsg := []byte("alice msg")
+
+	respSig := alice.RPC.SignMessageWithAddr(
+		&walletrpc.SignMessageWithAddrRequest{
+			Msg:  aliceMsg,
+			Addr: respAddr.Address,
+		},
+	)
+
+	respValid := bob.RPC.VerifyMessageWithAddr(
+		&walletrpc.VerifyMessageWithAddrRequest{
+			Msg:       aliceMsg,
+			Signature: respSig.Signature,
+			Addr:      respAddr.Address,
+		},
+	)
+
+	require.True(ht, respValid.Valid, "alice's signature didn't validate")
+
+	// Test an lnd wallet created NP2WKH address.
+	respAddr = alice.RPC.NewAddress(&lnrpc.NewAddressRequest{
+		Type: lnrpc.AddressType_NESTED_PUBKEY_HASH,
+	})
+
+	respSig = alice.RPC.SignMessageWithAddr(
+		&walletrpc.SignMessageWithAddrRequest{
+			Msg:  aliceMsg,
+			Addr: respAddr.Address,
+		},
+	)
+
+	respValid = bob.RPC.VerifyMessageWithAddr(
+		&walletrpc.VerifyMessageWithAddrRequest{
+			Msg:       aliceMsg,
+			Signature: respSig.Signature,
+			Addr:      respAddr.Address,
+		},
+	)
+
+	require.True(ht, respValid.Valid, "alice's signature didn't validate")
+
+	// Test an lnd wallet created P2TR address.
+	respAddr = alice.RPC.NewAddress(&lnrpc.NewAddressRequest{
+		Type: lnrpc.AddressType_TAPROOT_PUBKEY,
+	})
+
+	respSig = alice.RPC.SignMessageWithAddr(
+		&walletrpc.SignMessageWithAddrRequest{
+			Msg:  aliceMsg,
+			Addr: respAddr.Address,
+		},
+	)
+
+	respValid = bob.RPC.VerifyMessageWithAddr(
+		&walletrpc.VerifyMessageWithAddrRequest{
+			Msg:       aliceMsg,
+			Signature: respSig.Signature,
+			Addr:      respAddr.Address,
+		},
+	)
+
+	require.True(ht, respValid.Valid, "alice's signature didn't validate")
+
+	// Test verifying a signature with an external P2PKH address.
+	// P2PKH address type is not supported by the lnd wallet therefore
+	// using an external source (bitcoin-core) for address and
+	// signature creation.
+	externalMsg := []byte("external msg")
+	externalAddr := "msS5c4VihSiJ64QzvMMEmWh6rYBnuWo2xH"
+
+	// Base64 encoded signature created with bitcoin-core regtest.
+	externalSig := "H5DqqM7Cc8xZnYBr7j3gD4XD+AuQsim9Un/IxBrrhBA7I9//" +
+		"3exuQRg+u7HpwG65yobPsew6RMUteyuxyNkLF5E="
+
+	respValid = alice.RPC.VerifyMessageWithAddr(
+		&walletrpc.VerifyMessageWithAddrRequest{
+			Msg:       externalMsg,
+			Signature: externalSig,
+			Addr:      externalAddr,
+		},
+	)
+
+	require.True(ht, respValid.Valid, "external signature didn't validate")
+
+	// Test verifying a signature with a different address which
+	// initially was used to create the following signature.
+	// externalAddr is a valid legacy P2PKH bitcoin address created
+	// with bitcoin-core.
+	externalAddr = "mugbg8CqFe9CbdrYjFTkMhmL3JxuEXkNbY"
+
+	// Base64 encoded signature created with bitcoin-core regtest but with
+	// the address msS5c4VihSiJ64QzvMMEmWh6rYBnuWo2xH.
+	externalSig = "H5DqqM7Cc8xZnYBr7j3gD4XD+AuQsim9Un/IxBrrhBA7I9//" +
+		"3exuQRg+u7HpwG65yobPsew6RMUteyuxyNkLF5E="
+
+	respValid = alice.RPC.VerifyMessageWithAddr(
+		&walletrpc.VerifyMessageWithAddrRequest{
+			Msg:       externalMsg,
+			Signature: externalSig,
+			Addr:      externalAddr,
+		},
+	)
+
+	require.False(ht, respValid.Valid, "external signature did validate")
+}