Thursday 5 January 2017

c# string encryption/decryption



//service1.svc

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.Serialization;
using System.Security.Cryptography;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;

namespace WcfService1
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in code, svc and config file together.
    // NOTE: In order to launch WCF Test Client for testing this service, please select Service1.svc or Service1.svc.cs at the Solution Explorer and start debugging.
    public class Service1 : IService1
    {
        public string Encrypt(string clearText)
        {
            string EncryptionKey = "abc123";
            byte[] clearBytes = Encoding.Unicode.GetBytes(clearText);
            using (Aes encryptor = Aes.Create())
            {
                Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
                encryptor.Key = pdb.GetBytes(32);
                encryptor.IV = pdb.GetBytes(16);
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(clearBytes, 0, clearBytes.Length);
                        cs.Close();
                    }
                    clearText = Convert.ToBase64String(ms.ToArray());
                }
            }
            return clearText;
        }
        public string Decrypt(string cipherText)
        {
            string EncryptionKey = "abc123";
            cipherText = cipherText.Replace(" ", "+");
            byte[] cipherBytes = Convert.FromBase64String(cipherText);
            using (Aes encryptor = Aes.Create())
            {
                Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
                encryptor.Key = pdb.GetBytes(32);
                encryptor.IV = pdb.GetBytes(16);
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(cipherBytes, 0, cipherBytes.Length);
                        cs.Close();
                    }
                    cipherText = Encoding.Unicode.GetString(ms.ToArray());
                }
            }
            return cipherText;
        }
    }
}

------------------------------------------------------------
//default.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace password
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            var proxy = new ServiceReference1.Service1Client();

            encryption.Text = proxy.Encrypt(ux_password.Text);

            decryption.Text = proxy.Decrypt(encryption.Text);
        }
    }
}

-------------------------------------------------------------
//default.asp

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="default.aspx.cs" Inherits="password.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <table>
            <tr>
                <td>
                    <asp:Label ID="Label1" runat="server" Text="password"></asp:Label>
                    </td>
                <td>
                    <asp:TextBox ID="ux_password" runat="server" Width="800px"></asp:TextBox>
                </td>
                </tr>
            <tr>
                <td>
                    <asp:Label ID="Label2" runat="server" Text="encryption"></asp:Label>
                    </td>
                <td>
                    <asp:TextBox ID="encryption" runat="server" Width="800px"></asp:TextBox>
                </td>
                </tr>
            <tr>
                <td>
                    <asp:Label ID="Label3" runat="server" Text="decryption"></asp:Label>
                    </td>
                <td>
                    <asp:TextBox ID="decryption" runat="server" Width="800px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td colspan="2" style="text-align: center">
                    <asp:Button ID="Button1" runat="server" Text="Button" style="width:100%" OnClick="Button1_Click" />
                </td>
            </tr>
        </table>

    </div>
    </form>
</body>
</html>


1 comment:

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