log the encryption level of sent and received packets

protocol/encryption_level_test.go

@@ -0,0 +1,15 @@
+package protocol
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Encryption Level", func() {
+	It("has the correct string representation", func() {
+		Expect(EncryptionUnspecified.String()).To(Equal("unknown"))
+		Expect(EncryptionUnencrypted.String()).To(Equal("unencrypted"))
+		Expect(EncryptionSecure.String()).To(Equal("encrypted (not forward-secure)"))
+		Expect(EncryptionForwardSecure.String()).To(Equal("forward-secure"))
+	})
+})