This library is simply an implementation of the popular hashing algorithm MD5 for GM. The script is written purely in GML and works in registered and unregistered versions of GM5.3a and GM6 (and forward). The library comes with functions md5() for hashing strings and md5_file() for hashing files.
Please note that due to the general slowness of GM's functions, the script is relatively slow. Hashing short strings is not too problematic, but the script already starts becoming pretty slow with files of over few kilobytes. It is highly recommended that if you seriously need to hash file with md5, you should try to find a md5 dll for that purpose.
The library comes with very simple example of use. The example simply asks for string to hash and provides the md5 hash of that string. If don't really no idea what md5, then the chances are you wont need this.
More information about MD5 is available at:
http://userpages.umbc.edu/~mabzug1/cs/md5/md5.html