/// <summary>
/// ПУНКТ 2. Сериальный тест
/// Task 2. frequency test
/// </summary>
/// <param name="binaryKey"></param>
/// <returns>Returns either empty list or key</returns>
private static List <short> FrequencyTest(List <short> binaryText, int k, string testedName)
{
var freqTest = new FrequencyTester(k, binaryText.Count);
// testing sequence and getting khi value
var khi = freqTest.Test(binaryText);
var teorFreq = freqTest._TeorFrequency;
var practFrequencies = freqTest._PossibleBlocks;
// represent to user results of executed test
var isKeyOkay = ConsoleMessager.CheckKhiValue(khi, k, teorFreq, practFrequencies, testedName);
// TRYING TO GET VALID KEY
if (testedName == "ключа")
{
if (!isKeyOkay)
{
// generating a good key
var newKey = ReGenerateKey(isKeyOkay, binaryText.Count, k, testedName);
return(newKey);
}
else
{
return(binaryText);
}
}
return(new List <short>());
}
/// <summary>
/// Regeneration a key if it has not passed frequency test
/// </summary>
/// <param name="isKeyOkay"></param>
/// <param name="binaryTextLength"></param>
/// <param name="k"></param>
/// <param name="testedName"></param>
/// <returns></returns>
private static List <short> ReGenerateKey(bool isKeyOkay, int binaryTextLength, int k, string testedName)
{
var newKey = new List <short>();
while (!isKeyOkay)
{
Console.WriteLine("Regenerating key because it hasn't passed frequency test.");
newKey = GenerateKey(binaryTextLength);
var freqTest = new FrequencyTester(k, binaryTextLength);
var khi = freqTest.Test(newKey);
var teorFreq = freqTest._TeorFrequency;
var practFrequencies = freqTest._PossibleBlocks;
// represent to user results of executed test
isKeyOkay = ConsoleMessager.CheckKhiValue(khi, k, teorFreq, practFrequencies, testedName);
}
return(newKey);
}
