By all means, take a look at Digest::MD5 and Crypt::PasswdMD5. The later might be a better choice because it implements a standard MD5-based password hashing function, which has been widely tested.

Note that you will need modules in order to obtain at least the md5hex or equivalent function. Otherwise, you would need to roll your own code to do the same.

Security is never a concern until it becomes one.

Regards.