stubbed out cipher funcs

keytypes/types.go

@@ -0,0 +1,9 @@
+package keytypes
+
+// Key contains at least one keytypes.KeyPair, a cipher.Cipher, and a kdf.KDF.
+type Key interface {
+}
+
+// KeyPair contains a private key component, public key component, and comment.
+type KeyPair interface {
+}