一个可逆加密的例子

一个可逆加密的例子

http://lucky_elove.www1.dotnetplayground.com/

下面的这个例子实现了一个可逆加密的例子功能。代码很简单,这里就不多解释了。代码如下:

EncString.aspx

<%@ Page Language="vb" AutoEventWireup="false" Codebehind="EncString.aspx.vb" Inherits="aspxWeb.EncString"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
  <HEAD>
    <title>一个可逆加密的例子</title>
    <meta name="GENERATOR" content="Microsoft Visual Studio.NET 7.0">
    <meta name="CODE_LANGUAGE" content="Visual Basic 7.0">
    <meta name="vs_defaultClientScript" content="JavaScript">
    <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
  </HEAD>
  <body MS_POSITIONING="GridLayout">
    <h3 align="center">一个可逆加密的例子</h3>
    <p align="center">
      <form id="Form1" method="post" runat="server">
        <FONT face="宋体">
          <asp:TextBox id="TextBox1" runat="server" Width="96%"></asp:TextBox>
          <asp:RadioButtonList id="RadioButtonList1" runat="server" Font-Bold="True"
          RepeatDirection="Horizontal" AutoPostBack="True" OnSelectedIndexChanged="ShowRes">
          </asp:RadioButtonList>
          <asp:TextBox id="TextBox2" runat="server" Width="96%"></asp:TextBox>
        </FONT>
      </form>
    </p>
  </body>
</HTML>

EncString.aspx.vb

Imports System
Imports System.IO
Imports System.Xml
Imports System.Text
Imports System.Security.Cryptography
Public Class EncString
  Inherits System.Web.UI.Page
  Protected WithEvents TextBox1 As System.Web.UI.WebControls.TextBox
  Protected WithEvents TextBox2 As System.Web.UI.WebControls.TextBox
  Protected WithEvents Form1 As System.Web.UI.HtmlControls.HtmlForm
  Protected WithEvents RadioButtonList1 As System.Web.UI.WebControls.RadioButtonList
#Region " Web Form Designer Generated Code "
  'This call is required by the Web Form Designer.
  <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
  End Sub
  Private Sub Page_Init(ByVal sender As System.Object,_
   ByVal e As System.EventArgs) Handles MyBase.Init
    'CODEGEN: This method call is required by the Web Form Designer
    'Do not modify it using the code editor.
    InitializeComponent()
  End Sub
#End Region
  Private Sub Page_Load(ByVal sender As System.Object,_
   ByVal e As System.EventArgs) Handles MyBase.Load
    'Put user code to initialize the page here
    If Not IsPostBack Then
      Dim MyList As New ArrayList()
      MyList.Add("加密")
      MyList.Add("解密")
      RadioButtonList1.DataSource = MyList
      RadioButtonList1.DataBind()
    End If
  End Sub
  ' 加密
  Public Shared Function EncryptText(ByVal strText As String) As String
    Return Encrypt(strText, "&%#@?,:*")
  End Function
  '解密
  Public Shared Function DecryptText(ByVal strText As String) As String
    Return Decrypt(strText, "&%#@?,:*")
  End Function
  '加密函数
  Private Shared Function Encrypt(ByVal strText As String,_
   ByVal strEncrKey As String) As String
    Dim byKey() As Byte = {}
    Dim IV() As Byte = {&H12, &H34, &H56, &H78, &H90, &HAB, &HCD, &HEF}
    Try
      byKey = System.Text.Encoding.UTF8.GetBytes(Left(strEncrKey, 8))
      Dim des As New DESCryptoServiceProvider()
      Dim inputByteArray() As Byte = Encoding.UTF8.GetBytes(strText)
      Dim ms As New MemoryStream()
      Dim cs As New CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write)
      cs.Write(inputByteArray, 0, inputByteArray.Length)
      cs.FlushFinalBlock()
      Return Convert.ToBase64String(ms.ToArray())
    Catch ex As Exception
      Return ex.Message
    End Try
  End Function
  '解密函数
  Private Shared Function Decrypt(ByVal strText As String,_
   ByVal sDecrKey As String) As String
    Dim byKey() As Byte = {}
    Dim IV() As Byte = {&H12, &H34, &H56, &H78, &H90, &HAB, &HCD, &HEF}
    Dim inputByteArray(strText.Length) As Byte
    Try
      byKey = System.Text.Encoding.UTF8.GetBytes(Left(sDecrKey, 8))
      Dim des As New DESCryptoServiceProvider()
      inputByteArray = Convert.FromBase64String(strText)
      Dim ms As New MemoryStream()
      Dim cs As New CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write)
      cs.Write(inputByteArray, 0, inputByteArray.Length)
      cs.FlushFinalBlock()
      Dim encoding As System.Text.Encoding = System.Text.Encoding.UTF8
      Return encoding.GetString(ms.ToArray())
    Catch ex As Exception
      Return ex.Message
    End Try
  End Function
  Public Sub ShowRes(ByVal sender As Object, _
  ByVal e As System.EventArgs) Handles RadioButtonList1.SelectedIndexChanged
    If RadioButtonList1.SelectedIndex = 0 Then
      TextBox2.Text = EncryptText(TextBox1.Text)
    Else
      TextBox2.Text = DecryptText(TextBox1.Text)
    End If
  End Sub
End Class



Trackback: http://tb.blog.csdn.net/TrackBack.aspx?PostId=331320

你可能感兴趣的:(加密,exception,function,String,byte,textbox)