# Select a hash backend
+INCLUDE(SanitizeBool)
+
# USE_SHA1=CollisionDetection(ON)/HTTPS/Generic/OFF
+SanitizeBool(USE_SHA1)
IF(USE_SHA1 STREQUAL ON OR USE_SHA1 STREQUAL "CollisionDetection")
SET(SHA1_BACKEND "CollisionDetection")
ELSEIF(USE_SHA1 STREQUAL "HTTPS")