SNakano/PropelDataCacheBehavior — pull request #3 by staabm (2013-02-01 15:25:39+00:00)
Title: Update src/DataCacheBehaviorQueryBuilderModifier.php

since you don't need the cryptographic aspects of sha1, I suggest to use md4 instead which is nearly 2x faster in hashing.

see the benchmarks inside the comments section of...
http://php.net/manual/de/function.hash.php