VB.net编程教程:编写文字加解密程序(2)

介绍部分常用的枚举进入csmode.vb类的代码事件

输入代码：

Imports System

Imports System.IO

Imports System.Security.Cryptography

Imports System.Text

Public Class csmode

Public Function Encrypt(ByVal StrInput As String) As String

Dim ByteInput As [Byte]() = Encoding.Default.GetBytes(StrInput)

Dim ms As New System.IO.MemoryStream

Dim DESC As New DESCryptoServiceProvider

Dim CStream As New CryptoStream(ms, DESC.CreateEncryptor(Encoding.Default.GetBytes("20000000"), Encoding.Default.GetBytes("字节数量")), CryptoStreamMode.Write)

CStream.Write(ByteInput, 0, ByteInput.Length)

CStream.FlushFinalBlock()

Return Convert.ToBase64String(ms.ToArray())

End Function

Public Function Decrypt(ByVal StrInput As String) As String

Dim ByteInput As [Byte]() = Convert.FromBase64String(StrInput)

Dim ms As New System.IO.MemoryStream

Dim DESC As New DESCryptoServiceProvider

Dim CStream As New CryptoStream(ms, DESC.CreateDecryptor(Encoding.Default.GetBytes("20000000"), Encoding.Default.GetBytes("字节数量")), CryptoStreamMode.Write)

CStream.Write(ByteInput, 0, ByteInput.Length)

CStream.FlushFinalBlock()

Return Encoding.Default.GetString(ms.ToArray())

End Function

End Class

选择Form1窗体，进入代码编辑器

首先进行声明

Imports System

Imports System.IO

Imports System.Text

Public Class Form1

Inherits System.Windows.Forms.Form

进入Button1_Click事件

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim Encode As New csmode() '对文字进行加密

TextBox2.Text = Encode.Encrypt(TextBox1.Text)

End Sub

进入Button2_Click事件

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

Dim Decode As New csmode() '对文字进行解密

TextBox3.Text = Decode.Decrypt(TextBox2.Text)

End Sub

代码输入完毕，接下来运行程序进行测试。如图4

程序运行成功，以上是一个简单的文字加密与解密程序的编写过程，希望大家可以举一反三，利用这种思路可以编写出功能更强大的加解密程序。