diff --git a/repository/Grafoscopio-Utils/GrafoscopioUtils.class.st b/repository/Grafoscopio-Utils/GrafoscopioUtils.class.st
index 2fcec62..95ca750 100644
--- a/repository/Grafoscopio-Utils/GrafoscopioUtils.class.st
+++ b/repository/Grafoscopio-Utils/GrafoscopioUtils.class.st
@@ -8,6 +8,11 @@ Class {
 	#category : #'Grafoscopio-Utils'
 }
 
+{ #category : #'as yet unclassified' }
+GrafoscopioUtils class >> checksumFor: aFileReference [
+	^ (SHA1 new hashMessage: aFileReference binaryReadStream contents) hex.
+]
+
 { #category : #'graphical interface' }
 GrafoscopioUtils class >> downloadingFrom: downloadUrl withMessage: aString into: location [
 	| fileName |