MD5 and SHA-1

MD5 and SHA-1 methods produces a hash signature, and are the two of the most widely used methods. The MD5 algorithm has been show to have weaknesses, and a collision of message hashes has been shown to occur in less than one day. An MD5 signature has 128 bits, an SHA-1 signature has 160 bits, and an SHA-256 signature has 256 bits. [Lecture][Tutorial] The following is an example:

Message:

MD5:

SHA-1:

SHA-256:

SHA-384:

SHA-512:

As a test: "Hello" should give: 8b1a9953c4611296a827abf8c47804d7
and "hello" should give: 5d41402abc4b2a76b9719d911017c592

The code is:

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections;
using System.Security.Cryptography;

public partial class _Default3 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        string message;

        message = this.tbMessage.Text;

        System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();

        MD5 md5 = new MD5CryptoServiceProvider();
        SHA1 sha1 = new SHA1CryptoServiceProvider();
        SHA256Managed sha256 = new SHA256Managed();
        SHA384Managed sha384 = new SHA384Managed();
        SHA512Managed sha512 = new SHA512Managed();

        byte[] messageBytes = encoding.GetBytes(message);

        byte[] hashmessage = md5.ComputeHash(messageBytes);


        this.tbMD5.Text = ByteToString(hashmessage);

        hashmessage = sha1.ComputeHash(messageBytes);

        this.tbSHA1.Text = ByteToString(hashmessage);

        hashmessage = sha256.ComputeHash(messageBytes);

        this.tbSHA256.Text = ByteToString(hashmessage);

        hashmessage = sha384.ComputeHash(messageBytes);

        this.tbSHA384.Text = ByteToString(hashmessage);

        hashmessage = sha512.ComputeHash(messageBytes);

        this.tbSHA512.Text = ByteToString(hashmessage);

    }
    public static string ByteToString(byte[] buff)
    {
        string sbinary = "";

        for (int i = 0; i < buff.Length; i++)
        {
            sbinary += buff[i].ToString("X2"); // hex format
        }
        return (sbinary);
    }
}