Implement Identity encoding

multibase.go

@@ -12,6 +12,7 @@ import (
 type Encoding int
 
 const (
+	Identity          = 0x00
 	Base1             = '1'
 	Base2             = '0'
 	Base8             = '7'
@@ -38,6 +39,9 @@ var ErrUnsupportedEncoding = fmt.Errorf("selected encoding not supported")
 
 func Encode(base Encoding, data []byte) (string, error) {
 	switch base {
+	case Identity:
+		// 0x00 inside a string is OK in golang and causes no problems with the length calculation.
+		return string(Identity) + string(data), nil
 	case Base16, Base16Upper:
 		return string(Base16) + hex.EncodeToString(data), nil
 	case Base32, Base32Upper:
@@ -67,6 +71,8 @@ func Decode(data string) (Encoding, []byte, error) {
 	}
 
 	switch data[0] {
+	case Identity:
+		return Identity, []byte(data[1:]), nil
 	case Base16, Base16Upper:
 		bytes, err := hex.DecodeString(data[1:])
 		return Base16, bytes, err