1 files changed, 13 insertions, 0 deletions
diff --git a/listener.go b/listener.go
index 67a25e7..4163cb9 100644
--- a/listener.go
+++ b/listener.go
@@ -25,6 +25,19 @@ type ListenConfig struct {
 	StateDir   string
 }
 
+// NewListenConfigCert creates a listener config by unpacking the node ID from
+// its certificate.
+// The private key must still be specified.
+func NewListenConfigCert(cert string) (*ListenConfig, error) {
+	nodeID, _, err := unpackCert(cert)
+	if err != nil {
+		return nil, err
+	}
+	return &ListenConfig{
+		NodeID: nodeID,
+	}, nil
+}
+
 // Listen announces on the local network address.
 //
 // See func net.Dial for a description of the network and address parameters.