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/**
* SimpleIVMode
*
* A convenience class that automatically places the IV
* at the beginning of the encrypted stream, so it doesn't have to
* be handled explicitely.
* Copyright (c) 2007 Henri Torgemane
*
* See LICENSE.txt for full license information.
*/
package com.hurlant.crypto.symmetric
{
import flash.utils.ByteArray;
import com.hurlant.util.Memory;
public class SimpleIVMode implements IMode, ICipher
{
protected var mode:IVMode;
protected var cipher:ICipher;
public function SimpleIVMode(mode:IVMode) {
this.mode = mode;
cipher = mode as ICipher;
}
public function getBlockSize():uint {
return mode.getBlockSize();
}
public function dispose():void {
mode.dispose();
mode = null;
cipher = null;
Memory.gc();
}
public function encrypt(src:ByteArray):void {
cipher.encrypt(src);
var tmp:ByteArray = new ByteArray;
tmp.writeBytes(mode.IV);
tmp.writeBytes(src);
src.position=0;
src.writeBytes(tmp);
}
public function decrypt(src:ByteArray):void {
var tmp:ByteArray = new ByteArray;
tmp.writeBytes(src, 0, getBlockSize());
mode.IV = tmp;
tmp = new ByteArray;
tmp.writeBytes(src, getBlockSize());
cipher.decrypt(tmp);
src.length=0;
src.writeBytes(tmp);
}
public function toString():String {
return "simple-"+cipher.toString();
}
}
}
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