refactor: Split keys and keyext packages, make compression, signature and encryption packages public

internal/keyext/read.go

@@ -0,0 +1,15 @@
+package keyext
+
+import (
+	"io/ioutil"
+
+	"github.com/pojntfx/stfs/pkg/config"
+)
+
+func ReadKey(encryptionFormat string, pathToKey string) ([]byte, error) {
+	if encryptionFormat == config.NoneKey {
+		return []byte{}, nil
+	}
+
+	return ioutil.ReadFile(pathToKey)
+}