Check out javax.crypto in the SDK 1.4.2 Documentation

You have already JCE included in the JDK 1.4.

Please check this url:
java.sun.com/.../API_users_guide.html

Right, but the Bouncy Castle APIs offer quite a bit of code which is not
available in the JCE...things like PGP and other encryption  algorithms
as well as tools for building your own CA.

In addition to the crypto APIs in the JDK you should look at the Bouncy
Castle libraries: http://www.bouncycastle.org/

You can use Bouncy Castle in conjunction with the JDK crypto APIs to do
almost anything. One thing to note though is that the documentation is
not always that good in the Bouncy Castle library.