dr4k0nia · January 25, 2022 20:12 · dr4k0nia · Jan 25, 2022
diff --git a/crackme.cs b/crackme.cs
 // Simple crackme example by drakonia 

 Console.WriteLine("Enter the correct password:");
 string? solution = null;
 while (solution == null)
 {
    string? input = Console.ReadLine();
    solution = Verify(input);
 }

 Console.WriteLine($"The password is: {solution} Good job :)");
 Console.ReadKey();


 static string? Verify(string? input)
 {
    // Skip any checks if the input is invalid
    if (input == null)
        return null;

    // This is our key in encrypted form
    char[] secret =
    {
        'ä', 'ù', 'å', 'è', 'î', 'æ', 'î', 'Õ', 'Ý', 'è', 'þ', 'Ñ', 'ì', 'ø', 'â', 'ù', 'Ì', 'ù', 'Ö', 'É', 'æ', 'Ç',
        '×', 'Û', 'Þ', 'ā',
    };

    // hint that the password is the same length as secret
    if (input.Length != secret.Length)
        return null;

    // Buffer that will hold the encrypted form of input
    char[] buffer = new char[input.Length];

    // Encrypt the user input
    for (int i = 0; i < input.Length; i++)
    {
        char c = input[i];
        c += (char) 0xEA;
        c ^= (char) 0x7E;
        c -= (char) (0x5B + i);
        buffer[i] = c;
    }

    int sum = 0;
    // Compare the encrypted user input to secret
    for (int i = 0; i < buffer.Length; i++)
    {
        sum |= buffer[i] ^ secret[i];
    }

    if (sum == 0)
        return input;

    // Return null if input does not match secret
    return null;
 }
	// Simple crackme example by drakonia

	Console.WriteLine("Enter the correct password:");
	string? solution = null;
	while (solution == null)
	{
	string? input = Console.ReadLine();
	solution = Verify(input);
	}

	Console.WriteLine($"The password is: {solution} Good job :)");
	Console.ReadKey();


	static string? Verify(string? input)
	{
	// Skip any checks if the input is invalid
	if (input == null)
	return null;

	// This is our key in encrypted form
	char[] secret =
	{
	'ä', 'ù', 'å', 'è', 'î', 'æ', 'î', 'Õ', 'Ý', 'è', 'þ', 'Ñ', 'ì', 'ø', 'â', 'ù', 'Ì', 'ù', 'Ö', 'É', 'æ', 'Ç',
	'×', 'Û', 'Þ', 'ā',
	};

	// hint that the password is the same length as secret
	if (input.Length != secret.Length)
	return null;

	// Buffer that will hold the encrypted form of input
	char[] buffer = new char[input.Length];

	// Encrypt the user input
	for (int i = 0; i < input.Length; i++)
	{
	char c = input[i];
	c += (char) 0xEA;
	c ^= (char) 0x7E;
	c -= (char) (0x5B + i);
	buffer[i] = c;
	}

	int sum = 0;
	// Compare the encrypted user input to secret
	for (int i = 0; i < buffer.Length; i++)
	{
	sum \|= buffer[i] ^ secret[i];
	}

	if (sum == 0)
	return input;

	// Return null if input does not match secret
	return null;
	}