FormsAuthentication.HashPasswordForStoringInConfigFile Method (String, String)

Note: This API is now obsolete.

Produces a hash password suitable for storing in a configuration file based on the specified password and hash algorithm.

Namespace:   System.Web.Security
Assembly:  System.Web (in System.Web.dll)

[ObsoleteAttribute("The recommended alternative is to use the Membership APIs, such as Membership.CreateUser. For more information, see")]
public static string HashPasswordForStoringInConfigFile(
	string password,
	string passwordFormat


Type: System.String

The password to hash.

Type: System.String

The hash algorithm to use. passwordFormat is a String that represents one of the FormsAuthPasswordFormat enumeration values.

Return Value

Type: System.String

The hashed password.

Exception Condition

password is null


passwordFormat is null.


passwordFormat is not a valid FormsAuthPasswordFormat value.

The HashPasswordForStoringInConfigFile method creates a hashed password value that can be used when storing forms-authentication credentials in the configuration file for an application.

Authentication credentials stored in the configuration file for an application are used by the Authenticate method to verify passwords for users of an application. Alternatively, you can use ASP.NET membership to store user credentials. For more information, see Managing Users by Using Membership.

The following code example takes a user name, password, and hash type and displays the section of the configuration that includes the user definition and hashed password.

System_CAPS_security Security Note

This example contains a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<html xmlns="" >
    <title>ASP.NET Example</title>
<script runat="server">
         void Cancel_Click(object sender, EventArgs e)
            userName.Text = "";
            password.Text = "";
            repeatPassword.Text = "";
            result.Text = "";

         void HashPassword_Click(object sender, EventArgs e)
            if (Page.IsValid)
               string hashMethod = "";

               if (md5.Checked)
                  hashMethod = "MD5";
                  hashMethod = "SHA1";

               string hashedPassword =
                  FormsAuthentication.HashPasswordForStoringInConfigFile(password.Text, hashMethod);

               result.Text = "&lt;credentials passwordFormat=\"" + hashMethod +"\"&gt;<br />" +
                  "  &lt;user name=\"" + Server.HtmlEncode(userName.Text) + "\" password=\"" +
                  hashedPassword + "\" /&gt;<br />" + "&lt;/credentials&gt;";
               result.Text = "There was an error on the page.";

      <form id="form1" runat="server">
         <p>This form displays the results of the FormsAuthentication.HashPasswordForStoringInConfigFile
         method.<br />The user name and hashed password can be stored in a &lt;credentials&gt; node
         in the Web.config file.</p>
         <table cellpadding="2">
                  <td>New User Name:</td>
                  <td><asp:TextBox id="userName" runat="server" /></td>
                  <td><asp:RequiredFieldValidator id="userNameRequiredValidator" 
                        runat="server" ErrorMessage="User name required" 
                        ControlToValidate="userName" /></td>
                  <td>Password: </td>
                  <td><asp:TextBox id="password" runat="server" TextMode="Password" /></td>
                  <td><asp:RequiredFieldValidator id="passwordRequiredValidator" 
                        runat="server" ErrorMessage="Password required" 
                        ControlToValidate="password" /></td>
                  <td>Repeat Password: </td>
                  <td><asp:TextBox id="repeatPassword" runat="server" TextMode="Password" /></td>
                  <td><asp:RequiredFieldValidator id="repeatPasswordRequiredValidator" 
                        runat="server" ErrorMessage="Password confirmation required" 
                        ControlToValidate="repeatPassword" />
                      <asp:CompareValidator id="passwordCompareValidator" runat="server" 
                        ErrorMessage="Password does not match" 
                        ControlToCompare="password" /></td>
                  <td>Hash function:</td>
                  <td align="center">
                     <asp:RadioButton id="sha1" runat="server" GroupName="HashType" 
                                      Text="SHA1" />
                     <asp:RadioButton id="md5" runat="server" GroupName="HashType" 
                                      Text="MD5" />
                  <td align="center" colspan="2">
                    <asp:Button id="hashPassword" onclick="HashPassword_Click" 
                                runat="server" Text="Hash Password" />&nbsp;&nbsp; 
                    <asp:Button id="cancel" onclick="Cancel_Click" runat="server" 
                                Text="Cancel" CausesValidation="false" />

         <pre><asp:Label id="result" runat="server"></asp:Label></pre>

.NET Framework
Available since 1.1
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