Triple DES, C# - rextester

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Net.Sockets;
using System.Net;
using System.Security.Cryptography;

namespace Rextester
{
	/// <summary>
	/// Summary description for Class1
	/// </summary>
	static class Program
	{
	
        public static void Main(string[] args) {
          System.Console.WriteLine(CalcMac("C67DDB0CE47D27FAF6F32ECA5C99E8AF", "foobar"));
        }

static string CalcMac(string sKey, string sData)
        {
            byte[] bKey = HexToBytes(sKey);
            byte[] bMsg = HexToBytes(sData);
            byte[] iv = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            des.Padding = PaddingMode.Zeros;
            des.Mode = CipherMode.CBC;
            byte[] bK1 = new byte[8];
            for (int i = 0; i < 8; i++) bK1[i] = bKey[i];
            byte[] bK2 = new byte[8];
            for (int i = 0; i < 8; i++) bK2[i] = bKey[i + 8];
            ICryptoTransform ict1 = des.CreateEncryptor(bK1, iv);
            byte[] bFt = ict1.TransformFinalBlock(bMsg, 0, bMsg.Length);            
            byte[] bLCb = new byte[8];
            for (int i = 0; i < 8; i++) bLCb[i] = bFt[i + bFt.Length - 8];
            des.Mode = CipherMode.ECB;
            ICryptoTransform ict1_5 = des.CreateDecryptor(bK2, iv);
            bLCb = ict1_5.TransformFinalBlock(bLCb, 0, bLCb.Length);
            ICryptoTransform ict2 = des.CreateEncryptor(bK1, iv);
            byte[] bMac = ict2.TransformFinalBlock(bLCb, 0, bLCb.Length);
            return ToHex(bMac);
        }
        
        public static string ToHex(this byte[] bytes)
        {
            char[] c = new char[bytes.Length * 2];

byte b;

for (int bx = 0, cx = 0; bx < bytes.Length; ++bx, ++cx)
            {
                b = ((byte)(bytes[bx] >> 4));
                c[cx] = (char)(b > 9 ? b + 0x37 : b + 0x30);

b = ((byte)(bytes[bx] & 0x0F));
                c[++cx] = (char)(b > 9 ? b + 0x37  : b + 0x30);
            }

return new string(c);
        }        
        
        public static byte[] HexToBytes(this string str)
        {
            if (str.Length == 0 || str.Length % 2 != 0)
                throw new Exception("String length must be even");

byte[] buffer = new byte[str.Length / 2];
            char c;
            for (int bx = 0, sx = 0; bx < buffer.Length; ++bx, ++sx)
            {
                // Convert first half of byte 
                c = str[sx];
                buffer[bx] = (byte)((c > '9' ? (c > 'Z' ? (c - 'a' + 10) : (c - 'A' + 10)) : (c - '0')) << 4);

// Convert second half of byte 
                c = str[++sx];
                buffer[bx] |= (byte)(c > '9' ? (c > 'Z' ? (c - 'a' + 10) : (c - 'A' + 10)) : (c - '0'));
            }

return buffer;
        }		
	}
}

Show compiler warnings [ + ] Show input
Compilation time: 0.37 sec, absolute running time: 0.14 sec, cpu time: 0.12 sec, average memory usage: 19 Mb, average nr of threads: 4