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  • Committer: Package Import Robot
  • Author(s): Sylvestre Ledru
  • Date: 2014-01-19 14:12:40 UTC
  • mfrom: (1.2.4)
  • Revision ID: package-import@ubuntu.com-20140119141240-jg1l42cc158j59tn
Tags: 1.9.0~20140119~7dc8c2f-1
http://bugs.debian.org/733714
http://bugs.debian.org/735903
* New snapshot release (Closes: #733714)
* Provide sources for javascript and flash. Done in orig-tar.sh
  Available in third_party/websockify/include/web-socket-js/src/
  (Closes: #735903)

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third_party/websockify/include/web-socket-js/src/flash-src/third-party/com/hurlant/crypto/symmetric/IVMode.as
 
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/**
 
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 * IVMode
 
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 * 
 
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 * An abstract class for confidentialy modes that rely on an initialization vector.
 
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 * Copyright (c) 2007 Henri Torgemane
 
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 * 
 
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 * See LICENSE.txt for full license information.
 
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 */
 
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package com.hurlant.crypto.symmetric
 
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{
 
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        import com.hurlant.crypto.prng.Random;
 
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        import com.hurlant.crypto.tests.TestCase;
 
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        import com.hurlant.util.Memory;
 
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        import flash.utils.ByteArray;
 
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        /**
 
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         * An "abtract" class to avoid redundant code in subclasses
 
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         */
 
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        public class IVMode
 
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        {
 
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                protected var key:ISymmetricKey;
 
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                protected var padding:IPad;
 
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                // random generator used to generate IVs
 
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                protected var prng:Random;
 
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                // optional static IV. used for testing only.
 
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                protected var iv:ByteArray;
 
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                // generated IV is stored here.
 
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                protected var lastIV:ByteArray;
 
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                protected var blockSize:uint;
 
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                public function IVMode(key:ISymmetricKey, padding:IPad = null) {
 
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                        this.key = key;
 
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                        blockSize = key.getBlockSize();
 
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                        if (padding == null) {
 
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                                padding = new PKCS5(blockSize);
 
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                        } else {
 
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                                padding.setBlockSize(blockSize);
 
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                        }
 
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                        this.padding = padding;
 
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                        prng = new Random;
 
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                        iv = null;
 
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                        lastIV = new ByteArray;
 
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                }
 
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                public function getBlockSize():uint {
 
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                        return key.getBlockSize();
 
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                }
 
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                public function dispose():void {
 
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                        var i:uint;
 
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                        if (iv != null) {
 
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                                for (i=0;i<iv.length;i++) {
 
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                                        iv[i] = prng.nextByte();
 
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                                }
 
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                                iv.length=0;
 
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                                iv = null;
 
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                        }
 
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                        if (lastIV != null) {
 
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                                for (i=0;i<iv.length;i++) {
 
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                                        lastIV[i] = prng.nextByte();
 
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                                }
 
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                                lastIV.length=0;
 
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                                lastIV=null;
 
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                        }
 
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                        key.dispose();
 
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                        key = null;
 
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                        padding = null;
 
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                        prng.dispose();
 
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                        prng = null;
 
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                        Memory.gc();
 
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                }
 
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                /**
 
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                 * Optional function to force the IV value.
 
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                 * Normally, an IV gets generated randomly at every encrypt() call.
 
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                 * Also, use this to set the IV before calling decrypt()
 
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                 * (if not set before decrypt(), the IV is read from the beginning of the stream.)
 
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                 */
 
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                public function set IV(value:ByteArray):void {
 
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                        iv = value;
 
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                        lastIV.length=0;
 
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                        lastIV.writeBytes(iv);
 
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                }
 
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                public function get IV():ByteArray {
 
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                        return lastIV;
 
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                }
 
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                protected function getIV4e():ByteArray {
 
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                        var vec:ByteArray = new ByteArray;
 
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                        if (iv) {
 
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                                vec.writeBytes(iv);
 
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                        } else {
 
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                                prng.nextBytes(vec, blockSize);
 
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                        }
 
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                        lastIV.length=0;
 
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                        lastIV.writeBytes(vec);
 
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                        return vec;
 
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                }
 
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                protected function getIV4d():ByteArray {
 
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                        var vec:ByteArray = new ByteArray;
 
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                        if (iv) {
 
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                                vec.writeBytes(iv);
 
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                        } else {
 
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                                throw new Error("an IV must be set before calling decrypt()");
 
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                        }
 
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                        return vec;
 
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                }
 
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        }
 
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}
 
 
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