[Pharo-project] MD5 in pharo?

Hi, Some time ago, I read a thread about cryotography, and as far as I remember, some body says about integrate the basic algoritms (MD5 and maybe others) as part of the pharo core. Well... now I need to use MD5 and cryptography package is not working well (it opens a debugger each time I save my image). I wonder if there are another package with MD5? Cheers, Esteban