/*
* Main Enigma algorithm
*
* Here will be many comments with string report
* it is artifact of debug, think it may be usefull in future
*/
private char CipherChar(char sym)
{
// if uncomment it, it may crush
if (!alphabet.Contains(Char.ToUpper(sym)))
{
return(sym);
}
sym = m_commutators.Commutate(sym);
m_first.Rotate(1); /* first rotor rotate on each letter */
// symIndex always be index of main alphabet
int symIndex = m_first.Alphabet.IndexOf(sym);
// string report = $"[START] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex += m_first.RotorPosition;
symIndex %= m_first.Alphabet.Length;
if (m_first.StepLetters.Contains(m_first.Alphabet[m_first.RotorPosition]))
{
// report += "[SECOND ROTOR] Rotated by first\n";
m_second.Rotate(1);
}
// report += $"[FIRST ROTOR INPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex = m_first.CipherRightSignal(symIndex);
// report += $"[FIRST ROTOR OUTPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex -= m_first.RotorPosition;
symIndex += m_second.RotorPosition;
symIndex += m_second.Alphabet.Length;
symIndex %= m_second.Alphabet.Length;
if (m_second.StepLetters.Contains(m_second.Alphabet[m_second.RotorPosition]))
{
// report += "[THIRD ROTOR] Rotated by second\n";
m_third.Rotate(1);
}
// report += $"[SECOND ROTOR INPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex = m_second.CipherRightSignal(symIndex);
// report += $"[SECOND ROTOR OUTPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex -= m_second.RotorPosition;
symIndex += m_third.RotorPosition;
symIndex += m_third.Alphabet.Length;
symIndex %= m_third.Alphabet.Length;
// report += $"[THIRD ROTOR INPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex = m_third.CipherRightSignal(symIndex);
// report += $"[THIRD ROTOR OUTPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex -= m_third.RotorPosition;
symIndex += m_third.Alphabet.Length;
symIndex %= m_third.Alphabet.Length;
// report += $"[REFLECTOR INPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex = m_reflector.Reflect(symIndex);
// report += $"[REFLECTOR OUTPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex += m_third.RotorPosition;
symIndex %= m_third.Alphabet.Length;
// report += $"[THIRD ROTOR INPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex = m_third.CipherReflectedSignal(symIndex);
// report += $"[THIRD ROTOR OUTPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex -= m_third.RotorPosition;
symIndex += m_second.RotorPosition;
symIndex += m_second.Alphabet.Length;
symIndex %= m_second.Alphabet.Length;
// report += $"[SECOND ROTOR INPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex = m_second.CipherReflectedSignal(symIndex);
// report += $"[SECOND ROTOR OUTPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex -= m_second.RotorPosition;
symIndex += m_first.RotorPosition;
symIndex += m_first.Alphabet.Length;
symIndex %= m_first.Alphabet.Length;
// report += $"[FIRST ROTOR INPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex = m_first.CipherReflectedSignal(symIndex);
// report += $"[FIRST ROTOR OUTPUT] symindex = {symIndex}( {m_first.Alphabet[symIndex]} )\n";
symIndex -= m_first.RotorPosition;
symIndex += m_first.Alphabet.Length;
symIndex %= m_first.Alphabet.Length;
// report += $"[END]symIndex = {symIndex}, result = {m_first.Alphabet[symIndex]}\n";
// MessageBox.Show(report);
char notCommutatedResult = m_first.Alphabet[symIndex];
// MessageBox.Show($"notCommutatedResult = {m_first.Alphabet[symIndex]}\n");
return(m_commutators.Commutate(notCommutatedResult));
}