kisisorgu veritabanını encrypt/decrypt etmek için fonksiyonlar

SorguDecrypt.cs

public class SorguDecrypt
{
    // Şifrelenmiş veri alfabesi
    private char[] outAlphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz/++".ToCharArray();
    
    // Şifrelenmemiş veri alfabesi (ISO-8859-9)
    private char[] inAlphabet = null;

    private Encoding turkishEncoding = null;

    public SorguDecrypt()
    {
        turkishEncoding = Encoding.GetEncoding("iso-8859-9");
        var bytes = Enumerable.Range(0, 255).Select(a => (byte)a).ToArray();
        inAlphabet = turkishEncoding.GetChars(bytes);
    }

    public string Encode(string clearText)
    {
        if (String.IsNullOrEmpty(clearText)) return String.Empty;

        StringBuilder encodedString = new StringBuilder();

        clearText = clearText.PadRight(((clearText.Length - 1) / 3 + 1) * 3, (char)0);

        for (int j = 0; j < clearText.Length; j += 3)
        {
            var bytes = turkishEncoding.GetBytes(clearText.Substring(j, 3));

            int c1 = (int)(bytes[0]);
            int c2 = (int)(bytes[1]);
            int c3 = (int)(bytes[2]);

            int k1 = (c1) / 4;
            int k2 = (c1) % 4;
            int k3 = (c2) / 16;
            int k4 = (c2) % 16;
            int k5 = (c3) / 64;
            int k6 = (c3) % 64;

            char ec1 = outAlphabet[k1];
            char ec2 = outAlphabet[k3 + k2 * 16];
            char ec3 = outAlphabet[k5 + k4 * 4];
            char ec4 = outAlphabet[k6];

            encodedString.Append(ec1);
            encodedString.Append(ec2);
            if (c2 != 0) encodedString.Append(ec3);
            if (c3 != 0) encodedString.Append(ec4);
        }

        return encodedString.ToString();
    }

    public string Decode(string cipherText)
    {
        if (String.IsNullOrEmpty(cipherText)) return String.Empty;

        StringBuilder decodedString = new StringBuilder();

        cipherText = cipherText.PadRight(((cipherText.Length - 1) / 4 + 1) * 4, (char)0);

        for (int j = 0; j < cipherText.Length; j += 4)
        {
            string s = cipherText.Substring(j, 4);
            
            int c1 = Array.IndexOf(outAlphabet,(s[0]));
            int c2 = Array.IndexOf(outAlphabet, (s[1])) + (s[0] == '/' ? 64 : 0) ;
            int c3 = Array.IndexOf(outAlphabet, (s[2])) + (s[1] == '/' ? 64 : 0) ;
            int c4 = Array.IndexOf(outAlphabet, (s[3])) + (s[2] == '/' ? 64 : 0) ;

            int r1 = (c2 * 16) / 255;
            int r2 = (c3 * 64) / 255;

            char dc1 = inAlphabet[(c1 * 4 + r1)];
            char dc2 = inAlphabet[((c2 * 16 + r2) % 256)];
            int r3 = Math.Min(254,(c3 - Array.IndexOf(inAlphabet, dc2) % 16 * 4) % 64 * 64 + c4);
            char dc3 = c4 != -1 ? inAlphabet[r3] : (char)0;

            decodedString.Append((dc1));
            if (c3 != -1) decodedString.Append((dc2));
            if (c4 != -1) decodedString.Append((dc3));
        }

        return decodedString.ToString();
    }

    public static void Test()
    {
        SorguDecrypt decrypter = new SorguDecrypt();
        string enc = decrypter.Encode("DENEME");
        string dec = decrypter.Decode(enc);
        Console.WriteLine("{0}: {1}",enc,dec);
    }

}