Mine

#!/usr/bin/env python

import base64
import sys 

def main():
    # Should only need two arguments 1st is program name 2nd is hash
    if len(sys.argv) != 2:
        print "usage: unencode hash"
    else:
        b64hash = sys.argv[1]
        # Need to add == for padding because bacula strips this
        md5 = base64.b64decode(b64hash + "==")
        print base64.b16encode(md5).lower()

main()