I made these from implementations by Joseph Meyers and ez2.
What I did is wrap the code for closure compiler and add unit tests to make sure minimized code still working.
Here are the URLs of original implementations:
ez2: http://2basix.nl/page.php?al=javascript%20fast%20md5
Joseph Meyers: http://www.myersdaily.org/joseph/javascript/md5-text.html