public static void Decrypt()
{
var userInput = new DecryptionUserInput();
var intermediateSteps = new DecryptIntermediateSteps(userInput);
string decryptedPlainText = DecryptPlainText(userInput, intermediateSteps);
Console.WriteLine("Decrypted plaintext:");
Console.WriteLine(decryptedPlainText);
}
public DecryptIntermediateSteps(DecryptionUserInput userInput)
{
(string, string) DecryptBookIndexPositions()
{
string combinedEncryptedBookIndexPositions =
userInput.EncryptedBookGroupStart + userInput.EncryptedBookGroupEnd;
// Get a digit series of the word lengths in B.
string componentBWordLengths = userInput.ComponentB
.Split(' ')
.Aggregate("", (current, word) => current + word.Length);
// Resize component B's word lengths to the combined encrypted book index positions using the LFG.
string resizedComponentBWordLengths =
ResizeUsingLaggedFibonacciGenerator(componentBWordLengths, combinedEncryptedBookIndexPositions.Length);
// Decrypt the book index positions by subtracting component B's resized word lengths.
string decryptedCombinedBookIndexPositions = IndividualDigitsModulus10Calculation(
combinedEncryptedBookIndexPositions,
resizedComponentBWordLengths,
IndividualDigitsModulus10Operation.Subtract);
return(decryptedCombinedBookIndexPositions[..7], decryptedCombinedBookIndexPositions[7..14]);
