In revision 48279 at <http://svn.boost.org/svn/boost/sandbox/md5>, I added a class that will submit bytes to a MD5-processor byte-wise if CHAR_BIT was a factor of the hash block size, 512 bits. (This satisfies most computers since they have CHAR_BIT as 8.) I was wondering if anyone would like to try out the library, both people who have a system with CHAR_BIT == 8 and those who not, including those who have a system with 512 % CHAR_BIT == 0 even when CHAR_BIT isn't 8. I also need help checking little- vs. big-endian systems (if CHAR_BIT == 8). This will test all the optimizations. There are two preprocessor flags controlling optimizations, so try all qualifying combinations of those settings too. I hope this code is as speedy as C-based MD5 code. -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT hotmail DOT com