How to Encryption/Decryption in C#

Using the built in crypto classes in .NET can be surprisingly complicated. You need a lot of understanding of what you are doing to get it right and how to work in a secure manner. The choice of algorithm, what cipher mode, key length, block size and understand what salt is and how to use it and also how to hash a password to a proper key are some things you need to deal with. Hopefully, this article will make your life a lot easier.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.IO;
namespace EncryptionDeMO
{
   public partial class Form1 : Form
   {
      public Form1()
      {
         InitializeComponent();
      }
      private void button1_Click(object sender, EventArgs e)
      {
         textBox2.Text = Encrypt(textBox1.Text, "sanketshinde@12345678912"); //key size should be 128bits or 192 bits only
      }
      #region Encrypt and Decrypt code
      public string Encrypt(string input, string key)
      {
         byte[] inputArray = UTF8Encoding.UTF8.GetBytes(input);
         TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
         tripleDES.Key = UTF8Encoding.UTF8.GetBytes(key);
         tripleDES.Mode = CipherMode.ECB;
         tripleDES.Padding = PaddingMode.PKCS7;
         ICryptoTransform cTransform = tripleDES.CreateEncryptor();
         byte[] resultArray = cTransform.TransformFinalBlock(inputArray, 0, inputArray.Length);
         tripleDES.Clear();
         return Convert.ToBase64String(resultArray, 0, resultArray.Length);
      }
      public static string Decrypt(string input, string key)
      {
         byte[] inputArray = Convert.FromBase64String(input);
         TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
         tripleDES.Key = UTF8Encoding.UTF8.GetBytes(key);
         tripleDES.Mode = CipherMode.ECB;
         tripleDES.Padding = PaddingMode.PKCS7;
         ICryptoTransform cTransform = tripleDES.CreateDecryptor();
         byte[] resultArray = cTransform.TransformFinalBlock(inputArray, 0, inputArray.Length);
         tripleDES.Clear();
         return UTF8Encoding.UTF8.GetString(resultArray);
      }
      #endregion
      private void button2_Click(object sender, EventArgs e)
      {
         textBox3.Text = Decrypt(textBox2.Text, "sanketshinde@12345678912");
      }
   }
}