question: public static byte [ ] encode ( byte [ ] data , int off , int length ) { int len = ( length + 2 ) / 3 * 4 ; ByteArrayOutputStream bOut = new ByteArrayOutputStream ( len ) ; try { encoder . encode ( data , off , length , bOut ) ; } catch ( Exception e ) { throw new EncoderException ( "exception encoding base64 string: " + e . getMessage ( ) , e ) ; } return bOut . toByteArray ( ) ; }
target:  encode the input data producing a base 64 encoded byte array.