Crypto::Secret::Key used Sodium::SecureBuffer when available

src/crypto-secret/key.cr

@@ -1,12 +1,16 @@
 require "./bidet"
 
-module Crypto::Secret
-  # Use this class for holding small amounts of sensitive data such as crypto keys
-  #
-  # Underlying implentation subject to change
-  #
+# Use this class for holding small amounts of sensitive data such as crypto keys
+#
+# Underlying implentation subject to change
+#
+# Uses `Sodium::SecureBuffer` If "sodium" is required before "crypto-secret"
+{% if @type.has_constant?("Sodium") %}
+  class Crypto::Secret::Key < ::Sodum::SecureBuffer
+  end
+{% else %}
   # TODO: mlock
   # TODO: mprotect
-  class Key < Bidet
+  class Crypto::Secret::Key < ::Crypto::Secret::Bidet
   end
-end
+{% end %}

src/crypto-secret/secret.cr

@@ -106,7 +106,6 @@ module Crypto::Secret
     end
   end
 
-
   # Marks a region allocated using as read & write depending on implementation.
   abstract def readwrite : self
   # Marks a region allocated using as read-only depending on implementation.