public void UpdateInverseNumbersList()
{
foreach (int num in mNumbersList)
{
mInverseNumbers.Add(CalcUtilities.FindInverseNumber(num, mNumbersList, m));
}
}
public override void UpdateNumbersList()
{
for (int i = 0; i < m; ++i)
{
if (CalcUtilities.GCD(i, m) == 1)
{
mNumbersList.Add(i);
}
}
}
public static string DecipherString(string encryptedString, int keyA, int keyB,
MultGroup multGroup, AddGroup addGroup)
{
StringBuilder decipheredString = new StringBuilder();
foreach (char ch in encryptedString)
{
int y = CalcUtilities.GetEnglishLetterIndex(ch);
int minusOperationResult = addGroup.GetNegativeNumber((y - keyB));
int inverseNumber = multGroup.GetInverseNumber(keyA);
int x = (minusOperationResult * inverseNumber) % multGroup.Mod;
x = x <= 0 ? -x : x; // Makes X positive.
decipheredString.Append(CalcUtilities.GetUpperEnglishLetterByIndex(x));
}
return(decipheredString.ToString());
}
public int GetInverseNumber(int number)
{
return(CalcUtilities.FindInverseNumber(number, mNumbersList, m));
}
