DotNet: Encrypt or Decrypt user password in c#

Encrypt or Decrypt user password in c#

encryptdecrypt.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

</head>

<body>

<div>

<tr>

<b>Encryption and Decryption of Password</b>

</td>

</tr>

<tr>

<td>

UserName

</td>

<td>

<asp:TextBox ID="txtname" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<td>

Password

</td>

<td>

<asp:TextBox ID="txtPassword" runat="server" TextMode="Password"></asp:TextBox>

</td>

</tr>

<tr>

<td>

FirstName

</td>

<td>

<asp:TextBox ID="txtfname" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<td>

LastName

</td>

<td>

<asp:TextBox ID="txtlname" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<td>

</td>

<td>

<asp:Button ID="btnSubmit" runat="server" Text="Submit"

onclick="btnSubmit_Click" />

</td>

</tr>

</table>

</div>

<div>

<tr>

<td>

<b>Encryption of Password Details</b>

</td>

</tr>

<tr>

<td>

<asp:GridView ID="gvUsers" runat="server" CellPadding="4" BackColor="White"

BorderColor="#CC9966" BorderStyle="None" BorderWidth="1px">

<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC"

HorizontalAlign="Left"/>

</asp:GridView>

</td>

</tr>

</table>

</div>

<div>

<tr>

<td>

<b>Decryption of Password Details</b>

</td>

</tr>

<tr>

<td>

<asp:GridView ID="gvdecryption" runat="server" BackColor="White"

BorderColor="#CC9966" BorderStyle="None" BorderWidth="1px" CellPadding="4"

onrowdatabound="gvdecryption_RowDataBound">

</asp:GridView>

</td>

</tr>

</table>

</div>

</form>

</body>

</html>

encryptdecrypt.aspx.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data.SqlClient;

using System.Data;

using System.Text;

public partial class Default2 : System.Web.UI.Page

{

private const string strconneciton = "Data Source=COM3\\SQLEXPRESS;Initial Catalog=dotnettasks;Integrated Security=True";

SqlConnection con = new SqlConnection(strconneciton);

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

BindencryptedData();

BindDecryptedData();

}

/// <summary>

/// btnSubmit event is used to insert user details with password encryption

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

protected void btnSubmit_Click(object sender, EventArgs e)

{

string strpassword = Encryptdata(txtPassword.Text);

con.Open();

SqlCommand cmd = new SqlCommand("insert into SampleUserdetails(UserName,Password,FirstName,LastName) values('" + txtname.Text + "','" + strpassword + "','" + txtfname.Text + "','" + txtlname.Text + "')", con);

cmd.ExecuteNonQuery();

con.Close();

BindencryptedData();

BindDecryptedData();

}

/// <summary>

/// Bind user Details to gridview

/// </summary>

protected void BindencryptedData()

{

con.Open();

SqlCommand cmd = new SqlCommand("select * from SampleUserdetails", con);

SqlDataAdapter da = new SqlDataAdapter(cmd);

DataSet ds = new DataSet();

da.Fill(ds);

gvUsers.DataSource = ds;

gvUsers.DataBind();

con.Close();

}

/// <summary>

/// Bind user Details to gridview

/// </summary>

protected void BindDecryptedData()

{

con.Open();

SqlCommand cmd = new SqlCommand("select * from SampleUserdetails", con);

SqlDataAdapter da = new SqlDataAdapter(cmd);

DataSet ds = new DataSet();

da.Fill(ds);

gvdecryption.DataSource = ds;

gvdecryption.DataBind();

con.Close();

}

/// <summary>

/// Function is used to encrypt the password

/// </summary>

/// <param name="password"></param>

/// <returns></returns>

private string Encryptdata(string password)

{

string strmsg = string.Empty;

byte[] encode = new byte[password.Length];

encode = Encoding.UTF8.GetBytes(password);

//strmsg = Convert.ToInt64(encode);

strmsg = Convert.ToBase64String(encode);

return strmsg;

}

/// <summary>

/// Function is used to Decrypt the password

/// </summary>

/// <param name="password"></param>

/// <returns></returns>

private string Decryptdata(string encryptpwd)

{

string decryptpwd = string.Empty;

UTF8Encoding encodepwd = new UTF8Encoding();

Decoder Decode = encodepwd.GetDecoder();

byte[] todecode_byte = Convert.FromBase64String(encryptpwd);

int charCount = Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);

char[] decoded_char = new char[charCount];

Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);

decryptpwd = new String(decoded_char);

return decryptpwd;

}

/// <summary>

/// rowdatabound condition is used to change the encrypted password format to decryption format

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

protected void gvdecryption_RowDataBound(object sender, GridViewRowEventArgs e)

{

if (e.Row.RowType == DataControlRowType.DataRow)

{

string decryptpassword = e.Row.Cells[2].Text;

e.Row.Cells[2].Text = Decryptdata(decryptpassword);

}

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