Public Key Encryption - Using Java

Question

I'm trying to write a asymmetric key encryption using Java (without open source libraries like Apache CXF).

I'm able to do with Apache CXF, but without open source library - I hit the error "given final block not properly padded".

I need help with a Java sample code on how this can be achieved, using the below algo's:

• data encryption algo: http://www.w3.org/2001/04/xmlenc#aes128-cbc

• Key Wrap algo: http://www.w3.org/2001/04/xmlenc#rsa-1_5

I'm trying to encrypt the soap-header --> usernametoken.