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); } } }