Actually, OTM uses a one-way password hash, so there's no way to decrypt. In order to compare, you'd have to encrypt the user-supplied password and then compare the two encrypted values to each other.
Now, it has been a long time since I've worked with this code (around 4 years), but I believe that the password encryption in OTM is based on the Base64 algorithm (no pun intended). If your OTM environment and classpath are setup, you can get the Base64 encoded version of a password by using the following command:
Code:
glog.util.appclass.Base64Encoding <text password>
You'll need to test this, to ensure it hasn't changed, but this should help.
--Chris