question: public static byte [ ] encode ( byte [ ] data ) { ByteArrayOutputStream bOut = new ByteArrayOutputStream ( ) ; try { encoder . encode ( data , 0 , data . length , bOut ) ; } catch ( IOException e ) { throw new RuntimeException ( "exception encoding base64 string: " + e ) ; } return bOut . toByteArray ( ) ; }
target:  encode the input data producing a base 64 encoded byte array.