📄 symmetricwrite.aspx

📁 asp.net技术内幕的书配源码

💻 ASPX

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<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Security.Cryptography" %>

<Script Runat="Server">

CONST DESKey As String = "ABCDEFGH"
CONST DESIV As String = "HGFEDCBA"

Function Convert2ByteArray( strInput As String ) As Byte()
  Dim intCounter As Integer
  Dim arrChar As Char()

  arrChar = strInput.ToCharArray()
  Dim arrByte( arrChar.Length - 1 ) As Byte
  For intCounter = 0 To arrByte.Length - 1
    arrByte( intCounter ) = Convert.ToByte( arrChar( intCounter ) )
  Next
  Return arrByte
End Function

Sub Button_Click( s As Object, e As EventArgs )
  Dim arrDESKey As Byte()
  Dim arrDESIV AS Byte()
  Dim arrInput As Byte()
  Dim objFileStream As FileStream
  Dim objDES As DESCryptoServiceProvider
  Dim objEncryptor As ICryptoTransform
  Dim objCryptoStream As CryptoStream

  arrDESKey = Convert2ByteArray( DESKey )
  arrDESIV = Convert2ByteArray( DESIV )
  arrInput = Convert2ByteArray( txtInput.Text )
  objDES = New DESCryptoServiceProvider()
  objEncryptor = objDES.CreateEncryptor( arrDESKey, arrDESIV )
  objFileStream = New FileStream( _
    MapPath( "secret.txt" ), _
    FileMode.Create, _
    FileAccess.Write )
  objCryptoStream = New CryptoStream( _
    objFileStream, _
    objEncryptor, _
    CryptoStreamMode.Write )
  objCryptoStream.Write( arrInput, 0, arrInput.Length )
  objCryptoStream.Close()
End Sub

</Script>

<html>
<head><title>SymmetricWrite.aspx</title></head>
<body>

<form Runat="Server">

<h2>DES Encryption</h2>

<b>Enter text to encrypt:</b>
<br>
<asp:TextBox
  id="txtInput"
  TextMode="Multiline"
  Columns="50"
  Rows="10"
  Runat="Server" />
<p>
<asp:Button
  Text="Encrypt!"
  OnClick="Button_Click"
  Runat="Server" />

</form>
</body>
</html>

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