/// <summary>
/// Decode a file
/// </summary>
/// <param name="filepath">the file path</param>
/// <returns>The decoded string</returns>
public string DecodeSingleByteXORFile(string[] text, StringHelper.StringType stringType)
{
string bestString = string.Empty;
double bestScore = -1;
foreach (string line in text)
{
string ret = this.DecodeSingleByteXOR(line, stringType);
double retScore = this.GetFrequencyScore(ret);
if (bestScore < 0 || (retScore >= 0 && retScore < bestScore))
{
bestScore = retScore;
bestString = ret;
}
}
return(bestString.Trim());
}
/// <summary>
/// Decode a string encrypted via a single character
/// </summary>
/// <param name="encryptedString"></param>
/// <param name="stringType">The type of the string</param>
/// <returns></returns>
public string DecodeSingleByteXOR(string encryptedString, StringHelper.StringType stringType)
{
byte[] parsedString;
switch (stringType)
{
case StringHelper.StringType.Hex:
parsedString = StringHelper.ConvertHexStringToByteArray(encryptedString);
break;
case StringHelper.StringType.String:
parsedString = Encoding.ASCII.GetBytes(encryptedString);
break;
default:
parsedString = StringHelper.ConvertHexStringToByteArray(encryptedString);
break;
}
int character = -1;
string message = DecodeSingleByteXOR(parsedString, out character);
return(message);
}
