Base64 / MD5 Encoding & Decoding

I have to do Base64 / MD5 encoding and decoding of password,
How it can be done.
Please help its urgent. please send the code to do that

Base 64 coding can be done using Jakarta Commons Codec, while MD5 is supported by java.security.MessageDigest.

As to the urgency of your request, Ease Up.

MD5 is a 'hash' algorithm with an output length of 128 bits. This means that the infinity of possible byte arrays that you can hash must ALL map on to the 2^128 possible hash values. Now infinity divided by 2^128 is infinity so that there are an infinity of possible messages for each of the 2^128 possible hash values.

When trying to 'decrypt' a hash value, which of the infinity of possible messages is the one you want?

It is not necessary to 'decrypt' a password hash in order to decide if a user has presented a valid password. Just hash the presented password and compare this hash with the stored hash.