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/**
* TLSPad
*
* A padding implementation used by TLS
* 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.Hex;
import com.hurlant.crypto.tls.TLSError;
public class TLSPad implements IPad {
private var blockSize:uint;
public function TLSPad(blockSize:uint=0) {
this.blockSize = blockSize;
}
public function pad(a:ByteArray):void {
var c:uint = blockSize - (a.length+1)%blockSize;
for (var i:uint=0;i<=c;i++) {
a[a.length] = c;
}
}
public function unpad(a:ByteArray):void {
var c:uint = a.length%blockSize;
if (c!=0) throw new TLSError("TLSPad::unpad: ByteArray.length isn't a multiple of the blockSize", TLSError.bad_record_mac);
c = a[a.length-1];
for (var i:uint=c;i>0;i--) {
var v:uint = a[a.length-1];
a.length--;
if (c!=v) throw new TLSError("TLSPad:unpad: Invalid padding value. expected ["+c+"], found ["+v+"]", TLSError.bad_record_mac);
}
a.length--;
// mostly ripped off from PKCS5.as, but with subtle differences
}
public function setBlockSize(bs:uint):void {
blockSize = bs;
}
}
}
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