Aes ECB None, C# - rextester

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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using System.Security.Cryptography;
using System.Diagnostics;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string key = "59b50e345cab8b6d421b161918ea3fbd7e5921eea7d43d1ac54fa92cca452bb5";
            string iv = "00000000000000000000000000000000";
            string message = "3b16601d0a7e283c1f24d30ec214676885096cb0bbf3998012a2be87c5a58d89";
            string encryptedReferenceOFB = "578946591ce2d787cbe41bec77a58dac66e6007fb722b1af847ecc3bf4212cea";
            string encryptedReferenceECB = "d0aa1d38f2338de417a919cc5380c81d9a5f90b8cd505a4839eaa30ab524fd82";
            
            var encryptedString = AesCsp.EncryptHexStrings(message, key, iv);
            var decryptedString = AesCsp.DecryptHexStrings(encryptedString, key, iv);
            Debug.Assert(message.ToUpper() == decryptedString.ToUpper());
            Debug.Assert(encryptedString.ToUpper() == encryptedReferenceECB.ToUpper());
           
            Console.WriteLine(encryptedString);
            Console.WriteLine(encryptedReferenceECB);
        }
    }
    
    
    static class AesCsp
    {

public static byte[] /*output*/ EncryptBytes(byte[] input, byte[] aesKey, byte[] aesIV)
  {
    Aes aes = new AesCryptoServiceProvider();
    aes.Padding = PaddingMode.None;
      aes.Mode = CipherMode.ECB;
    var enc = aes.CreateEncryptor(aesKey, aesIV);
    return enc.TransformFinalBlock (input, 0, input.Length);    
  }

public static byte[] DecryptBytes(byte[] encryptedOutput, byte[] aesKey, byte[] aesIV)
  {
    Aes aes = new AesCryptoServiceProvider();
    aes.Padding = PaddingMode.None;
    var dec = aes.CreateDecryptor(aesKey, aesIV);
    return dec.TransformFinalBlock(encryptedOutput, 0, encryptedOutput.Length);
  }

public static string EncryptHexStrings(string input, byte[] aesKey, byte[] aesIV)
  {
    byte[] bytes = HexStringToByteArray(input);
    byte[] encBytes = EncryptBytes (bytes,aesKey,aesIV);
    return ByteArrayToHexString(encBytes);
  }

public static string DecryptHexStrings(string encryptedOutput, byte[] aesKey, byte[] aesIV)
  {
    byte[] bytes = HexStringToByteArray(encryptedOutput);
    byte[] decBytes = DecryptBytes(bytes,aesKey,aesIV);
    return ByteArrayToHexString(decBytes);
  }

public static string EncryptHexStrings(string input, string aesKey, string aesIV)
  {
    byte[] key = HexStringToByteArray(aesKey);
    byte[] iv = HexStringToByteArray(aesIV);
    return EncryptHexStrings(input, key, iv);
  }

public static string DecryptHexStrings(string encryptedOutput, string aesKey, string aesIV)
  {
    byte[] key = HexStringToByteArray(aesKey);
    byte[] iv = HexStringToByteArray(aesIV);
    return DecryptHexStrings(encryptedOutput,key,iv);
  }

public static byte[] HexStringToByteArray(string s)
  {
    byte[] ret = new byte[s.Length / 2];
    for (int i=0; i<s.Length; i+=2)
    {
      ret[i/2] = Convert.ToByte (s.Substring (i,2), 16);      
    }
    return ret;
  }

public static string ByteArrayToHexString(byte[] bytes)
  {
    var sb = new StringBuilder();
    foreach (byte b in bytes)
      sb.AppendFormat("{0:X2}", b);
    return sb.ToString();
  }

}
    
}

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Compilation time: 0.24 sec, absolute running time: 0.14 sec, cpu time: 0.12 sec, average memory usage: 16 Mb, average nr of threads: 4