Encrypt password using MD5 hash in asp.net

In this article I am going to explain how Encrypt password using MD5 hash in asp.net.

Description:

MD5 is an acronym for Message-Digest 5. It is a fast and powerful method of increasing security to file transfers and message request transfers. To convert the text value into MD5 Hash value use the name System.Security.Cryptography.

Implementation:

HTML Markup:

<fieldset style="width:30%">

    <legend>Convert text (string) into MD5 hash</legend>

    <table>

    <tr><td>Enter Password : </td><td>

        <asp:TextBox ID="txtpwd" runat="server"></asp:TextBox></td></tr>

     <tr><td></td><td>

         <asp:Button ID="btnsubmit" runat="server" Text="Submit" /></td></tr>

      <tr><td colspan="2">

          <asp:Label ID="lblresult" runat="server"></asp:Label></td></tr>

    </table>

    </fieldset>

Import the namespace:

C# code:

using System.Security.Cryptography;

using System.Text;

VB.net Code:

Imports System.Text

Imports System.Security.Cryptography

Convert text into MD5 hash

Create a method to convert the string into MD5 hash and call it on button click.

C# code:

protected void btnsubmit_Click(object sender, EventArgs e)

    {

        lblresult.Text = ConvertPwdtoMD5(txtpwd.Text);

    }

    public static string ConvertPwdtoMD5(string strword)

    {

        MD5 md5 = MD5.Create();

        byte[] Bytes = Encoding.ASCII.GetBytes(strword);

        byte[] hash = md5.ComputeHash(Bytes);

        StringBuilder sBuilder = new StringBuilder();

        for (int i = 0; i < hash.Length; i++)

        {

            sBuilder.Append(hash[i].ToString("x2"));

        }

        return sBuilder.ToString();

    }

VB.net Code:

Protected Sub btnsubmit_Click(sender As Object, e As System.EventArgs) Handles btnsubmit.Click

        lblresult.Text = ConvertPwdtoMD5(txtpwd.Text)

    End Sub

    Public Shared Function ConvertPwdtoMD5(strword As String) As String

        Dim md5 As MD5 = md5.Create()

        Dim Bytes As Byte() = Encoding.ASCII.GetBytes(strword)

        Dim hash As Byte() = md5.ComputeHash(Bytes)

        Dim sBuilder As New StringBuilder()

        For i As Integer = 0 To hash.Length - 1

            sBuilder.Append(hash(i).ToString("x2"))

        Next

        Return sBuilder.ToString()

    End Function