using System;

using System.Text;

using  System.Security.Cryptography;

​

​

​

public class Program {

    public static string testb(byte[] byteArray) {

            var sb = new StringBuilder("new byte[] { ");

        for(var i = 0; i < byteArray.Length;i++) {

            var b = byteArray[i];

            sb.Append(b);

            if (i < byteArray.Length -1)

            {

                sb.Append(", ");

            }

        }

        sb.Append(" }");

        return sb.ToString();

    }

    public static void Main() {

        byte[] appKey = Encoding.ASCII.GetBytes("BsjE6ZpTCSaFVTLRmIv8pF2A8jZHnX4E");

        byte[] byteArray = DecryptBySymmetricKey("CIY1eqYCeS674ssEekf0bBxh76FJVg8CfLjRfR7c65VHPQjv/AN+ZctmVFIRRQES", appKey);

        Console.WriteLine(testb(byteArray));

        //Console.WriteLine(System.Text.Encoding.UTF8.GetString(byteArray));

    }

​

    public static byte[] DecryptBySymmetricKey(string encryptedText, byte[] key) {

    //Decrypting SEK

        try {

            byte[] dataToDecrypt = Convert.FromBase64String(encryptedText);

            //Console.WriteLine(testb(dataToDecrypt));

            var keyBytes = key;

            AesManaged tdes = new AesManaged();

            tdes.KeySize = 256;

            tdes.BlockSize = 128;

            tdes.Key = keyBytes;

            tdes.Mode = CipherMode.ECB;

            tdes.Padding = PaddingMode.PKCS7;

            ICryptoTransform decrypt__1 = tdes.CreateDecryptor();

            byte[] deCipher = decrypt__1.TransformFinalBlock(dataToDecrypt, 0, dataToDecrypt.Length);

            tdes.Clear();

            //string EK_result = Convert.ToBase64String(deCipher);

            //return EK_result;

            return deCipher;

        } catch (Exception ex) {

            throw ex;

        }

    }

}

​

​