Java Security

I have created a pair of keys and stored the public and private keys in my registry windows. Now, another part of my code, i would like to read the public key from the registry and do some 3DES encryption on my data with that rsa public key. I would like to know if there is a way to set the value read from the registry and create (or set to) an instance of java.security.PublicKey?

Thank you ,
Bick