1 files changed, 20 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/digest.rb b/activesupport/lib/active_support/digest.rb
new file mode 100644
index 0000000000..fba10fbdcf
--- /dev/null
+++ b/activesupport/lib/active_support/digest.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+module ActiveSupport
+  class Digest #:nodoc:
+    class <<self
+      def hash_digest_class
+        @hash_digest_class ||= ::Digest::MD5
+      end
+
+      def hash_digest_class=(klass)
+        raise ArgumentError, "#{klass} is expected to implement hexdigest class method" unless klass.respond_to?(:hexdigest)
+        @hash_digest_class = klass
+      end
+
+      def hexdigest(arg)
+        hash_digest_class.hexdigest(arg)[0...32]
+      end
+    end
+  end
+end