diff --git a/crypto.go b/crypto.go
index 0fb4cee..15aafa0 100644
--- a/crypto.go
+++ b/crypto.go
@@ -206,11 +206,11 @@ func blindBaseElement(blindingFactor btcec.ModNScalar) *btcec.PublicKey {
 type sharedSecretGenerator interface {
 	// generateSharedSecret given a public key, generates a shared secret
 	// using private data of the underlying sharedSecretGenerator.
-	generateSharedSecret(dhKey *btcec.PublicKey) (Hash256, error)
+	GenerateSharedSecret(dhKey *btcec.PublicKey) (Hash256, error)
 }
 
 // generateSharedSecret generates the shared secret by given ephemeral key.
-func (r *Router) generateSharedSecret(dhKey *btcec.PublicKey) (Hash256, error) {
+func (r *Router) GenerateSharedSecret(dhKey *btcec.PublicKey) (Hash256, error) {
 	var sharedSecret Hash256
 
 	// Ensure that the public key is on our curve.
diff --git a/sphinx.go b/sphinx.go
index 36e9a81..d59d0e1 100644
--- a/sphinx.go
+++ b/sphinx.go
@@ -534,7 +534,7 @@ func (r *Router) ProcessOnionPacket(onionPkt *OnionPacket,
 	assocData []byte, incomingCltv uint32) (*ProcessedPacket, error) {
 
 	// Compute the shared secret for this onion packet.
-	sharedSecret, err := r.generateSharedSecret(onionPkt.EphemeralKey)
+	sharedSecret, err := r.GenerateSharedSecret(onionPkt.EphemeralKey)
 	if err != nil {
 		return nil, err
 	}
@@ -568,7 +568,7 @@ func (r *Router) ReconstructOnionPacket(onionPkt *OnionPacket,
 	assocData []byte) (*ProcessedPacket, error) {
 
 	// Compute the shared secret for this onion packet.
-	sharedSecret, err := r.generateSharedSecret(onionPkt.EphemeralKey)
+	sharedSecret, err := r.GenerateSharedSecret(onionPkt.EphemeralKey)
 	if err != nil {
 		return nil, err
 	}
@@ -731,7 +731,7 @@ func (t *Tx) ProcessOnionPacket(seqNum uint16, onionPkt *OnionPacket,
 	assocData []byte, incomingCltv uint32) error {
 
 	// Compute the shared secret for this onion packet.
-	sharedSecret, err := t.router.generateSharedSecret(
+	sharedSecret, err := t.router.GenerateSharedSecret(
 		onionPkt.EphemeralKey,
 	)
 	if err != nil {