Converting from Tcl to Java...need to decode passwords stored in DB

Hello:
I am converting an application that was previously coded in Tcl/Vignette to Java. Part of this application is a login process. There are already passwords established for thousands of users and I need to be able to have Java decode these passwords from the DB when the users log in. The Vignette Tcl method used to encode the passwords previously was ENCODE64.
I am almost completely ignorant of doing encrypting/decrypting in Java. can someone give me some idea of what I can use to be able to encode incoming passwords at login so that they can match with the ENCODE64 passwords that exist in the database??
Basic lgoic is this (pseudocode):
login = false
encryptedPassword = encrypt(password_in)
if encryptedPassword = dbPassword then set login = true
Does that make sense??
Thanks!
Brian

The Bouncy Castle JCE provider (www.bouncycastle.org) has Base64 encoder/decoder classes that 'just work'.
import org.bouncycastle.util.encoders.Base64;
String base64encodedString = "ABCKD4632adcomd";
byte[] decoded = Base64.decode(base64encodedString);
String reencoded = new String(Base64.encode(decoded));As for your second question re: how should you re encrypt the passwords? The standard, quite secure way of doing this is to use a one-way cipher. This will encrypt the password text to an unintelligible mess, that CANNOT be decrypted back to the original.
When a new user enters their password for the first time, you use your cipher to encrypt it, and store this (not the actual password).
To verify this user, you take the password they give you, encrypt it in the same way, and compare the results.
Unix/Linux can use a shell command called 'crypt' to do exactly this... MySQL will also do it for you... INSERT INTO blah VALUES(CRYPT('blahpasswordstring'), and SELECT * FROM blah WHERE password=CRYPT('enteredpassword')).
... and its far too early in the morning, and I cant for the life of me remember the JCE equivalent of this function :(

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