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/**
* MAC
*
* An ActionScript 3 implementation of MAC, Message Authentication Code
* for use with SSL 3.0.
* Loosely copyrighted by Bobby Parker.
* As3crypto copyrighted by Henri Torgemane.
*
* See LICENSE.txt for full license information.
*/
package com.hurlant.crypto.hash
{
import flash.utils.ByteArray;
import com.hurlant.util.Hex;
public class MAC implements IHMAC
{
private var hash:IHash;
private var bits:uint;
private var pad_1:ByteArray;
private var pad_2:ByteArray;
private var innerHash:ByteArray;
private var outerHash:ByteArray;
private var outerKey:ByteArray;
private var innerKey:ByteArray;
/**
* Create a MAC object (for SSL 3.0 ) and
* optionally a number of bits to return.
* The MAC will be truncated to that size if needed.
*/
public function MAC(hash:IHash, bits:uint=0) {
this.hash = hash;
this.bits = bits;
innerHash = new ByteArray();
outerHash = new ByteArray();
innerKey = new ByteArray();
outerKey = new ByteArray();
if (hash != null) {
var pad_size:int = hash.getPadSize();
pad_1 = new ByteArray();
pad_2 = new ByteArray();
for (var x:int = 0; x < pad_size; x++) {
pad_1.writeByte(0x36);
pad_2.writeByte(0x5c);
}
}
}
public function setPadSize(pad_size:int) : void { }
public function getHashSize():uint {
if (bits!=0) {
return bits/8;
} else {
return hash.getHashSize();
}
}
/**
* Compute a MAC using a key and some data.
*
*/
public function compute(key:ByteArray, data:ByteArray):ByteArray {
// take that incoming key and do hash(key + pad_2 + hash(key + pad_1 + sequence + length + record)
// note that data = (sequence + type + length + record)
if (pad_1 == null) {
var pad_size:int = hash.getPadSize();
pad_1 = new ByteArray();
pad_2 = new ByteArray();
for (var x:int = 0; x < pad_size; x++) {
pad_1.writeByte(0x36);
pad_2.writeByte(0x5c);
}
}
// Do some preliminary checking on stuff
/*
if (key.length > hash.getInputSize()) {
hashKey = hash.hash(key);
} else {
hashKey = new ByteArray;
hashKey.writeBytes(key);
}
while (hashKey.length < hash.getInputSize() ) {
hashKey[hashKey.length] = 0;
} */
// Henri's conventions work just fine here..
innerKey.length = 0;
outerKey.length = 0;
// trace("MAC Key: " + Hex.fromArray(key));
// trace("Key Length: " + key.length);
// trace("Pad_1 : " + Hex.fromArray(pad_1));
// inner hash calc
innerKey.writeBytes(key);
innerKey.writeBytes(pad_1);
innerKey.writeBytes(data);
// trace("MAC Inner Key: " + Hex.fromArray(innerKey));
innerHash = hash.hash(innerKey);
// trace("MAC Inner Hash: " + Hex.fromArray(innerHash));
// outer hash calc
outerKey.writeBytes(key);
outerKey.writeBytes(pad_2);
outerKey.writeBytes(innerHash);
// trace("MAC Outer Key: " + Hex.fromArray(outerKey));
outerHash = hash.hash(outerKey);
if (bits > 0 && bits < 8*outerHash.length) {
outerHash.length = bits/8;
}
// trace("MAC for record: " + Hex.fromArray(outerHash));
return outerHash;
}
public function dispose():void {
hash = null;
bits = 0;
}
public function toString():String {
return "mac-"+(bits>0?bits+"-":"")+hash.toString();
}
}
}
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