Thursday 31 January 2013

how to encrypt and decrypt password and stored in database using asp.net or encrypt or decrypt user password with c#


<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table align="center">
<tr>
<td colspan="2">
<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>
<table align="center">
<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">
<RowStyle BackColor="White" ForeColor="#330099" />
<FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
<PagerStyle BackColor="#FFFFCC" ForeColor="#330099" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC"
HorizontalAlign="Left"/>
</asp:GridView>
</td>
</tr>
</table>
</div>
<div>
<table align="center">
<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">
<RowStyle BackColor="White" ForeColor="#330099" />
<FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
<PagerStyle BackColor="#FFFFCC" ForeColor="#330099" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC" />
</asp:GridView>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>

aspx.cs:


SqlConnection con = new SqlConnection(" your connection string");
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.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);
}
}