DeCrypt a string using dual encryption method. Return a DeCrypted clear string - CSharp System.Security.Cryptography

CSharp examples for System.Security.Cryptography:Encrypt Decrypt

  1. HOME
  2. CSharp
  3. System.Security.Cryptography
  4. Encrypt Decrypt

Description

DeCrypt a string using dual encryption method. Return a DeCrypted clear string

Demo Code


using System.Configuration;
using System.Security.Cryptography;
using System.Text;
using System.Collections.Generic;
using System;/*from  w  w w . j ava2s  . c om*/

public class Main{
        /// <summary>
        /// DeCrypt a string using dual encryption method. Return a DeCrypted clear string
        /// </summary>
        /// <param name="cipherString">encrypted string</param>
        /// <param name="useHashing">Did you use hashing to encrypt this data? pass true is yes</param>
        /// <returns></returns>
        public static string Decrypt(string cipherString, bool useHashing)
        {
            byte[] keyArray;
            byte[] toEncryptArray = Convert.FromBase64String(cipherString);

            System.Configuration.AppSettingsReader settingsReader = new AppSettingsReader();
            //Get your key from config file to open the lock!
            //string key = (string)settingsReader.GetValue("SecurityKey", typeof(String));
            string key = encryptionKey;

            if (useHashing)
            {
                MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
                keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
                hashmd5.Clear();
            }
            else
                keyArray = UTF8Encoding.UTF8.GetBytes(key);

            TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
            tdes.Key = keyArray;
            tdes.Mode = CipherMode.ECB;
            tdes.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = tdes.CreateDecryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            tdes.Clear();
            return UTF8Encoding.UTF8.GetString(resultArray);
        }
        public static string Decrypt(string cipherString)
        {
            return Decrypt(Decrypt(cipherString, true),true);
        }
}

Related Tutorials