울어라휘파람새야
ASP.NET(C#) MD5, SHA256 암호화 예제 본문
* WebForm2.aspx
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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="WebForm2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<label>값 입력</label>
<input type="text" name="testvalue" />
<br /><br />
<label>MD5 결과</label>
<asp:Label ID="md5Result" runat="server"></asp:Label>
<br />
</div>
<br /><br /><br /><br />
<div>
<br /><br />
<label>SHA256 결과</label>
<asp:Label ID="shaResult" runat="server"></asp:Label>
</div>
<br /><br />
<div>
<br /><br />
<label>MD5 -> SHA256 결과</label>
<asp:Label ID="md5ChSha" runat="server"></asp:Label>
</div>
<br /><br /><br /><br />
<div>
<input type="submit" name="subBtn"/>
</div>
</form>
</body>
</html>
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* WebForm2.aspx.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Security.Cryptography;
public partial class WebForm2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
string testvalue;
testvalue = Request.Form["testvalue"];
md5Result.Text = MD5Hash(testvalue);
shaResult.Text = SHA256Hash(testvalue);
md5ChSha.Text = SHA256Hash(MD5Hash(testvalue));
}
}
// MD5 암호화 128bit 암호화
public static string MD5Hash(string Data)
{
MD5 md5 = new MD5CryptoServiceProvider();
byte[] hash = md5.ComputeHash(Encoding.ASCII.GetBytes(Data));
StringBuilder stringBuilder = new StringBuilder();
foreach (byte b in hash)
{
stringBuilder.AppendFormat("{0:x2}", b);
}
return stringBuilder.ToString();
}
// SHA256 256bit 암호화
public static string SHA256Hash(string Data)
{
SHA256 sha = new SHA256Managed();
byte[] hash = sha.ComputeHash(Encoding.ASCII.GetBytes(Data));
StringBuilder stringBuilder = new StringBuilder();
foreach (byte b in hash)
{
stringBuilder.AppendFormat("{0:x2}", b);
}
return stringBuilder.ToString();
}
}
