748         byte[] b = bi.toByteArray();
 749         int n = b.length;
 750         if (n == len) {
 751             return b;
 752         }
 753         if ((n == len + 1) && (b[0] == 0)) {
 754             byte[] t = new byte[len];
 755             System.arraycopy(b, 1, t, 0, len);
 756             return t;
 757         }
 758         if (n > len) {
 759             return null;
 760         }
 761         // must be smaller
 762         byte[] t = new byte[len];
 763         System.arraycopy(b, 0, t, (len - n), n);
 764         return t;
 765     }
 766 
 767     // see JCA spec

 768     protected void engineSetParameter(String param, Object value)
 769             throws InvalidParameterException {
 770         throw new UnsupportedOperationException("setParameter() not supported");
 771     }
 772 
 773     // see JCA spec

 774     protected Object engineGetParameter(String param)
 775             throws InvalidParameterException {
 776         throw new UnsupportedOperationException("getParameter() not supported");
 777     }
 778 }

 748         byte[] b = bi.toByteArray();
 749         int n = b.length;
 750         if (n == len) {
 751             return b;
 752         }
 753         if ((n == len + 1) && (b[0] == 0)) {
 754             byte[] t = new byte[len];
 755             System.arraycopy(b, 1, t, 0, len);
 756             return t;
 757         }
 758         if (n > len) {
 759             return null;
 760         }
 761         // must be smaller
 762         byte[] t = new byte[len];
 763         System.arraycopy(b, 0, t, (len - n), n);
 764         return t;
 765     }
 766 
 767     // see JCA spec
 768     @SuppressWarnings("deprecation")
 769     protected void engineSetParameter(String param, Object value)
 770             throws InvalidParameterException {
 771         throw new UnsupportedOperationException("setParameter() not supported");
 772     }
 773 
 774     // see JCA spec
 775     @SuppressWarnings("deprecation")
 776     protected Object engineGetParameter(String param)
 777             throws InvalidParameterException {
 778         throw new UnsupportedOperationException("getParameter() not supported");
 779     }
 780 }