VB.NET编程环境可以帮助开发人员打造一个性能稳定,安全可靠的编程平台,帮助开发人员大大提高编程效率。本文介绍使用XOR加密算法对数据进行加密, 这是一种很简单的算法,使用了尽量简单的VB编程方法,通俗易懂。我们可以采用更安全的算法如DES算法,IDEA算法等。各位如有任何见解,请不吝赐教。
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在窗体中添加一RichTextBox,设置其Name属性为SourceFile,Multiline属性为True,ScrollBars属性为3-both。添加一MainMenu,设置一菜单项“文件”,其下有“打开”,“保存”,“加密”,“解密”,“算子”等子菜单项。
以下是大致的VB.NET加密文件的程序界面:
- Public Class Form1
- Inherits System.Windows.Forms.Form
- Dim strNum As String
- Private Sub Form1_Load(ByVal eventSender
As System.Object, ByVal eventArgs
As System.EventArgs) Handles MyBase.Load- strNum = "password"
- End Sub
- Private Sub Form1_Resize(ByVal event
Sender As System.Object, ByVal eventArgs
As System.EventArgs) Handles MyBase.Resize- SourceFile.Width = Form1.DefInstance.Width
- SourceFile.Height = Form1.DefInstance.Height
- End Sub
解密过程,对xor算法而言,解密和VB.NET加密文件的过程是完全一样的
- Private Function XorOut(ByRef
strNum As String, ByRef strText
As String) As String- Dim i As Integer
- Dim XorValue1 As Short
- Dim XorValue2 As Short
- Dim strResult As String
- For i = 1 To Len(strText)
- XorValue1 = Asc(Mid(strText, i, 1))
- XorValue2 = Asc(Mid(strNum,
(i Mod Len(strNum)) + 1, 1))- strResultstrResult = strResult &
Chr(XorValue1 Xor XorValue2)- Next
- XorOut = strResult
- End Function
- Private Sub MenuDeEncrypt_Click
(ByVal sender As System.Object,
ByVal e As System.EventArgs)
Handles MenuDeEncrypt.Click- SourceFile.Text = XorOut(strNum,
(SourceFile.Text))- End Sub
- Private Sub MenuEncrypt_Click
(ByVal sender As System.Object,
ByVal e As System.EventArgs)
Handles MenuEncrypt.Click- SourceFile.Text = XorOut(strNum,
(SourceFile.Text))- End Sub
- Private Sub MenuOpen_Click(ByVal
sender As System.Object, ByVal e
As System.EventArgs) Handles
MenuOpen.Click- Dim openFile1 As New OpenFileDialog
- ' Determine whether the user
selected a file from the OpenFileDialog.- If (openFile1.ShowDialog() =
DialogResult.OK) _- And (openFile1.FileName.Length > 0) Then
- ' Load the contents of the
file into the RichTextBox.- SourceFile.LoadFile(openFile1.FileName, _
- RichTextBoxStreamType.PlainText)
- End If
- End Sub
- Private Sub MenuSave_Click(ByVal
sender As System.Object, ByVal e As
System.EventArgs) Handles MenuSave.Click- ' Create a SaveFileDialog to request
a path and file name to save to.- Dim saveFile1 As New SaveFileDialog
- ' Initialize the SaveFileDialog to
specify the RTF extension for the file.- 'saveFile1.DefaultExt = "*.rtf"
- 'saveFile1.Filter = "RTF Files|*.rtf"
- ' Determine if the user selected a
file name from the saveFileDialog.- If (saveFile1.ShowDialog() = DialogResult.OK) _
- And (saveFile1.FileName.Length) > 0 Then
- ' Save the contents of the
RichTextBox into the file.- SourceFile.SaveFile(saveFile1.FileName, _
- RichTextBoxStreamType.PlainText)
- End If
- End Sub
- Private Sub MenuNum_Click(ByVal
sender As System.Object, ByVal e
As System.EventArgs) Handles MenuNum.Click- strNum = InputBox("请输入加密算子",
"设置加密算子")- End Sub
- End Class
VB.NET加密文件的相关编写过程就为大家介绍到这里。
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