using System;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static void Main()

    {

​

        var encrypted = EncryptUserEmail("austin.mauldin@kcc.com");

        Console.WriteLine($"Encrypted: {encrypted}");

        var decrypt = DecryptorUserEmail(encrypted);

        Console.WriteLine($"Decrypt: {decrypt}");

    }

    public static readonly string ENCODED_KEY = "KCCUID123";

    public static readonly byte[] ENCODED_KEY_BYTES = ASCIIEncoding.ASCII.GetBytes(ENCODED_KEY);

    public static readonly byte[] HASH = new MD5CryptoServiceProvider().ComputeHash(ENCODED_KEY_BYTES);

    public static TripleDESCryptoServiceProvider COMMON_DES_PROVIDER = new TripleDESCryptoServiceProvider

    {

        Key = new MD5CryptoServiceProvider()

            .ComputeHash(ASCIIEncoding.ASCII.GetBytes("KCCUID123")),

        Mode = CipherMode.ECB

    };

    public static string DecryptorUserEmail(string emailString)

    {

        ICryptoTransform desDecryptorTransform = COMMON_DES_PROVIDER.CreateDecryptor();

        byte[] emailStringBuffer = Convert.FromBase64String(emailString);

        return ASCIIEncoding.ASCII.GetString(desDecryptorTransform.TransformFinalBlock(emailStringBuffer, 0, emailStringBuffer.Length));

    }

    public static string EncryptUserEmail(string emailString)

    {

        ICryptoTransform desEncryptTransform = COMMON_DES_PROVIDER.CreateEncryptor();

        byte[] emailStringBuffer = ASCIIEncoding.ASCII.GetBytes(emailString);

        return Convert.ToBase64String(desEncryptTransform.TransformFinalBlock(emailStringBuffer, 0, emailStringBuffer.Length));

    }

}