/js/lib/Socket.IO-node/support/socket.io-client/lib/vendor/web-socket-js/flash-src/com/hurlant/crypto/symmetric/SSLPad.as

 1/**
 2 * TLSPad
 3 * 
 4 * A padding implementation used by TLS
 5 * Copyright (c) 2007 Henri Torgemane
 6 * 
 7 * See LICENSE.txt for full license information.
 8 */
 9package com.hurlant.crypto.symmetric {
10	import flash.utils.ByteArray;
11	import com.hurlant.util.Hex;
12	import com.hurlant.crypto.tls.TLSError;
13	
14	public class SSLPad implements IPad {
15		private var blockSize:uint;
16		
17		public function SSLPad(blockSize:uint=0) {
18			this.blockSize = blockSize;
19		}
20		public function pad(a:ByteArray):void {
21			var c:uint = blockSize - (a.length+1)%blockSize;
22			for (var i:uint=0;i<=c;i++) {
23				a[a.length] = c;
24			}
25			
26		}
27		public function unpad(a:ByteArray):void {
28			var c:uint = a.length%blockSize;
29			if (c!=0) throw new TLSError("SSLPad::unpad: ByteArray.length isn't a multiple of the blockSize", TLSError.bad_record_mac);
30			c = a[a.length-1];
31			for (var i:uint=c;i>0;i--) {
32				var v:uint = a[a.length-1];
33				a.length--;
34				// But LOOK! SSL 3.0 doesn't care about this, bytes are arbitrary!
35				// if (c!=v) throw new TLSError("SSLPad:unpad: Invalid padding value. expected ["+c+"], found ["+v+"]", TLSError.bad_record_mac);
36			}
37			a.length--;
38			
39		}
40		public function setBlockSize(bs:uint):void {
41			blockSize = bs;
42		}
43	}
44}