applyCipher.java

private final static int DEFAULT_READ_WRITE_BLOCK_BUFFER_SIZE = 1024;

public static void applyCipher(String inFile, String outFile, Cipher cipher) throws Exception {

         CipherInputStream in = new CipherInputStream(new FileInputStream(inFile), cipher);
         BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(outFile));
	    
	    byte[] buffer = new byte[DEFAULT_READ_WRITE_BLOCK_BUFFER_SIZE];
	    int count = 0;
	    while ((count = in.read(buffer)) >= 0) {
               out.write(buffer, 0, count);
            }
	    in.close();
	    out.flush();
	    out.close();  
	    	
	 }