Image Encryption and Decryption Using 3DES Algorithm C#

Question

i am having problem in writing the decryption code; please, help me out

Madan Shekar · Answer

Now, add a new class and name it ClsTripleDES.cs. Add a static function named 'Encrypt'. This function will create a TripleDES string instance. This is taking a string as a key value and it will calculate an MD5 hash on TripleDES classinput parameter string. This hash value would be used as a real key for the encryption.   Similarly, for decryption, add TripleDES class'Decrypt' function. This function will take a CypherText to decrypt. It will return a string value.   Refer to the following code snippet. using  System;     using  System.Collections.Generic;     using  System.Linq;     using  System.Security.Cryptography;     using  System.Text;     using  System.Threading.Tasks;           namespace  TripleDES     {         public   class  ClsTripleDES        {                  private   const   string  mysecurityKey =  "MyTestSampleKey" ;                  public   static   string  Encrypt( string  TextToEncrypt)           {               byte [] MyEncryptedArray = UTF8Encoding.UTF8                 .GetBytes(TextToEncrypt);                    MD5CryptoServiceProvider MyMD5CryptoService =  new                  MD5CryptoServiceProvider();                     byte [] MysecurityKeyArray = MyMD5CryptoService.ComputeHash                 (UTF8Encoding.UTF8.GetBytes(mysecurityKey));                    MyMD5CryptoService.Clear();                    var MyTripleDESCryptoService =  new                  TripleDESCryptoServiceProvider();                    MyTripleDESCryptoService.Key = MysecurityKeyArray;                    MyTripleDESCryptoService.Mode = CipherMode.ECB;                    MyTripleDESCryptoService.Padding = PaddingMode.PKCS7;                    var MyCrytpoTransform = MyTripleDESCryptoService                 .CreateEncryptor();                     byte [] MyresultArray = MyCrytpoTransform                 .TransformFinalBlock(MyEncryptedArray, 0,                 MyEncryptedArray.Length);                    MyTripleDESCryptoService.Clear();                     return  Convert.ToBase64String(MyresultArray, 0,                 MyresultArray.Length);           }                              public   static   string  Decrypt( string  TextToDecrypt)           {               byte [] MyDecryptArray = Convert.FromBase64String                 (TextToDecrypt);                    MD5CryptoServiceProvider MyMD5CryptoService =  new                  MD5CryptoServiceProvider();                     byte [] MysecurityKeyArray = MyMD5CryptoService.ComputeHash                 (UTF8Encoding.UTF8.GetBytes(mysecurityKey));                    MyMD5CryptoService.Clear();                    var MyTripleDESCryptoService =  new                  TripleDESCryptoServiceProvider();                    MyTripleDESCryptoService.Key = MysecurityKeyArray;                    MyTripleDESCryptoService.Mode = CipherMode.ECB;                    MyTripleDESCryptoService.Padding = PaddingMode.PKCS7;                    var MyCrytpoTransform = MyTripleDESCryptoService                 .CreateDecryptor();                     byte [] MyresultArray = MyCrytpoTransform                 .TransformFinalBlock(MyDecryptArray, 0,                 MyDecryptArray.Length);                    MyTripleDESCryptoService.Clear();                     return  UTF8Encoding.UTF8.GetString(MyresultArray);           }        }     }