// The decoding Algorithm
public string DecodeMessage(string EncodedIMMessage, string MacString)
{
string DecodedMessage = "";
char[] arraySplit = { ' ' };
string[] IMMessageWords = EncodedIMMessage.Split(arraySplit);
int i = 0;
foreach (string encodedword in IMMessageWords)
{
if (encodedword.Length == 0)
{
continue;
}
if (String.Equals(encodedword, ""))
{
continue;
}
string MacSplit;
MacSplit = MacString.Substring(i * (int)AlgoParameters.MACSIZE, (int)AlgoParameters.MACSIZE);
if (ChaffMACCodeGenerator.VerifyMAC(encodedword, MacSplit, sessionkey) == true)
{
DecodedMessage = DecodedMessage + " " + encodedword;
}
i++;
}
return(DecodedMessage);
}
String GenerateMACString(string[] queryResult, String word)
{
Boolean encodedword = false;
String MacString = "";
foreach (string mesgword in queryResult)
{
if (mesgword.Length == 0)
{
continue;
}
if (String.Equals(mesgword, ""))
{
continue;
}
if (String.Equals(word, mesgword) && encodedword == false)
{
//Console.WriteLine("\n Word:" + mesgword + " MacString: " + ChaffMACCodeGenerator.ComputeMAC(mesgword, sessionkey));
MacString = MacString + ChaffMACCodeGenerator.ComputeMAC(mesgword, sessionkey);
encodedword = true;
}
else
{
string randomMac;
randomMac = ChaffMACCodeGenerator.RandomMAC(randomMacGenerator);
//Console.WriteLine("\n Word:" + mesgword + " MacString: " + randomMac);
MacString = MacString + randomMac;
}
}
return(MacString);
}
