Example

The following example pads an input buffer, transforms the padded buffer with already-initialized IMode instances, then unpads the output buffer.

 IPad padding = IPad.getInstance("PKCS7");
 padding.init(blockSize);
 byte[] pad = padding.pad(input, 0, input.length);
 byte[] pt = new byte[input.length + pad.length];
 byte[] ct = new byte[pt.length];
 byte[] cpt = new byte[pt.length];
 System.arraycopy(input, 0, pt, 0, input.length);
 System.arraycopy(pad, 0, pt, input.length, pad.length);
 
 for (int i = 0; i + blockSize < pt.length; i += blockSize)
 {
 enc.update(pt, i, ct, i);
 }
 
 for (int i = 0; i + blockSize < ct.length; i += blockSize)
 {
 dec.update(ct, i, cpt, i);
 }
 
 int unpad = padding.unpad(cpt, 0, cpt.length);
 byte[] output = new byte[cpt.length - unpad];
 System.arraycopy(cpt, 0, output, 0, output.length);