end-to-end: un-export a few things.

Updates odeke-em#543

src/dcrypto/dcrypto.go

@@ -28,11 +28,11 @@ import (
 // Version is the version of the en/decryption library used.
 type Version uint32
 
-// Decrypter is a function that creates a decrypter.
-type Decrypter func(io.Reader, []byte) (io.ReadCloser, error)
+// decrypter is a function that creates a decrypter.
+type decrypter func(io.Reader, []byte) (io.ReadCloser, error)
 
-// Encrypter is a function that creates a encrypter.
-type Encrypter func(io.Reader, []byte) (io.Reader, error)
+// encrypter is a function that creates a encrypter.
+type encrypter func(io.Reader, []byte) (io.Reader, error)
 
 // These are the different versions of the en/decryption library.
 const (
@@ -42,20 +42,20 @@ const (
 // PreferedVersion is the prefered version of encryption.
 const PreferedVersion = V1
 
-var encrypters map[Version]Encrypter
-var decrypters map[Version]Decrypter
+var encrypters map[Version]encrypter
+var decrypters map[Version]decrypter
 
 func init() {
-	decrypters = map[Version]Decrypter{
+	decrypters = map[Version]decrypter{
 		V1: v1.NewDecryptReader,
 	}
 
-	encrypters = map[Version]Encrypter{
+	encrypters = map[Version]encrypter{
 		V1: v1.NewEncryptReader,
 	}
 }
 
-// NewEncrypter returns an Encrypter using the PreferedVersion.
+// NewEncrypter returns an encrypting reader using the PreferedVersion.
 func NewEncrypter(r io.Reader, password []byte) (io.Reader, error) {
 	v, err := writeVersion(PreferedVersion)
 	if err != nil {
@@ -72,7 +72,7 @@ func NewEncrypter(r io.Reader, password []byte) (io.Reader, error) {
 	return io.MultiReader(bytes.NewBuffer(v), encReader), nil
 }
 
-// NewDecrypter returns a Decrypter based on the version used to encrypt.
+// NewDecrypter returns a decrypting reader based on the version used to encrypt.
 func NewDecrypter(r io.Reader, password []byte) (io.ReadCloser, error) {
 	version, err := readVersion(r)
 	if err != nil {