channeldb: read raw htlc attempt session key

channeldb/mp_payment_test.go

@@ -0,0 +1,27 @@
+package channeldb
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// TestLazySessionKeyDeserialize tests that we can read htlc attempt session
+// keys that were previously serialized as a private key as raw bytes.
+func TestLazySessionKeyDeserialize(t *testing.T) {
+	var b bytes.Buffer
+
+	// Serialize as a private key.
+	err := WriteElements(&b, priv)
+	require.NoError(t, err)
+
+	// Deserialize into [btcec.PrivKeyBytesLen]byte.
+	attempt := HTLCAttemptInfo{}
+	err = ReadElements(&b, &attempt.sessionKey)
+	require.NoError(t, err)
+	require.Zero(t, b.Len())
+
+	sessionKey := attempt.SessionKey()
+	require.Equal(t, priv, sessionKey)
+}