.net中已包含有md5加密的方法，如下：
<%@ Page Language="C#" ContentType="text/html"%>
<%@ Import Namespace="System"%><script language="C#" runat="server">
void Page_Load(Object sender,EventArgs e){
//獲取要加密的字段，並轉化爲Byte[]數組
byte[] data=System.Text.Encoding.Unicode.GetBytes(source.Text.ToCharArray());
//建立加密服務
System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
//加密Byte[]數組
byte[] result= md5.ComputeHash(data);
//將加密後的數組轉化爲字段
string sResult=System.Text.Encoding.Unicode.GetString(result);
//顯示出來
label1.Text="MD5普通加密："+sResult.ToString()+"<br/>";
//作爲密碼方式加密
string EnPswdStr=System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(source.Text.ToString(),"MD5");
//顯示出來
label2.Text="MD5密碼加密："+EnPswdStr+"<br/>";
}
</script>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>test</title>
</head>
<body>
<h3>SHA1test</h3>
<form runat="server">
<asp:label id="sha1_1" runat="server"></asp:label>
<asp:label id="sha1_2" runat="server"></asp:label>
<asp:textbox ID="source" runat="server" TextMode="SingleLine" Text="test" AutoPostBack="true" />
</form>
</body>
</html>