text: /**
   * CFBMode
   * 
   * An ActionScript 3 implementation of the CFB confidentiality mode
   * Copyright (c) 2007 Henri Torgemane
   * 
   * See LICENSE.txt for full license information.
   */
  package com.hurlant.crypto.symmetric
  {
  	import flash.utils.ByteArray;
  
  	/**
  	 * This is the "full" CFB.
  	 * CFB1 and CFB8 are hiding somewhere else.
  	 * 
  	 * Note: The constructor accepts an optional padding argument, but ignores it otherwise.
  	 */
  	public class CFBMode extends IVMode implements IMode
  	{
  		
  		public function CFBMode(key:ISymmetricKey, padding:IPad = null) {
  			super(key,null);
  		}
  
  		public function encrypt(src:ByteArray):void
  		{
  			var l:uint = src.length;
  			var vector:ByteArray = getIV4e();
  			for (var i:uint=0;i<src.length;i+=blockSize) {
  				key.encrypt(vector);
  				var chunk:uint = (i+blockSize<l)?blockSize:l-i;
  				for (var j:uint=0;j<chunk;j++) {
  					src[i+j] ^= vector[j];
  				}
  				vector.position=0;
  				vector.writeBytes(src, i, chunk);
  			}
  		}
  		
  		public function decrypt(src:ByteArray):void
  		{
  			var l:uint = src.length;
  			var vector:ByteArray = getIV4d();
  			var tmp:ByteArray = new ByteArray;
  			for (var i:uint=0;i<src.length;i+=blockSize) {
  				key.encrypt(vector);
  				var chunk:uint = (i+blockSize<l)?blockSize:l-i;
  				tmp.position=0;
  				tmp.writeBytes(src, i, chunk);
  				for (var j:uint=0;j<chunk;j++) {
  					src[i+j] ^= vector[j];
  				}
  				vector.position=0;
  				vector.writeBytes(tmp);
  			}
  		}
  		
  		public function toString():String {
  			return key.toString()+"-cfb";
  		}
  
  	}
  }