1.0.3    2004 August 18
         Modified hashsize() to return number of bits, instead of bytes
         (to become consistent with Digest::SHA of Mark Shelor)

1.0.2    2003 July 29
         Minor code cleanup

1.0.1    Optimized even more
         Refined "files.pl" example script by including error-checking

1.0.0    2003 June 07
         Initial release