VB.NET如何实现DES加密

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VB.NET DES加密代码：

Imports System  Imports System.Collections.Generic  Imports System.Text  Imports System.IO  Imports System.Security  Imports System.Security.Cryptography   Namespace ZU14  NotInheritable Public Class DES  Private iv As String = "1234的yzo" Private key As String = "123在yzo"  '/ 
 '/ DES加密偏移量，必须是>=8位长的字符串  '/ 
  Public Property IV() As String  Get  Return iv  End Get  Set  iv = value End Set  End Property  '/ 
 '/ DES加密的私钥，必须是8位长的字符串  '/ 
  Public Property Key() As String  Get  Return key  End Get  Set  key = value End Set  End Property   '/ 
 '/ 对字符串进行DES加密  '/ 
 '/ 待加密的字符串 '/ 加密后的BASE64编码的字符串 Public Function Encrypt(sourceString As String) As String  Dim btKey As Byte() = Encoding.Default.GetBytes(key)  Dim btIV As Byte() = Encoding.Default.GetBytes(iv)  Dim des As New DESCryptoServiceProvider()  Dim ms As New MemoryStream()  Try  Dim inData As Byte() = Encoding.Default.GetBytes(sourceString)  Try  Dim cs As New CryptoStream(ms, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write)  Try  cs.Write(inData, 0, inData.Length)  cs.FlushFinalBlock()  Finally  cs.Dispose()  End Try   Return Convert.ToBase64String(ms.ToArray())  Catch  End Try  Finally  ms.Dispose()  End Try  End Function 'Encrypt   '/ 
 '/ 对DES加密后的字符串进行解密  '/ 
 '/ 待解密的字符串 '/ 解密后的字符串 Public Function Decrypt(encryptedString As String) As String  Dim btKey As Byte() = Encoding.Default.GetBytes(key)  Dim btIV As Byte() = Encoding.Default.GetBytes(iv)  Dim des As New DESCryptoServiceProvider()   Dim ms As New MemoryStream()  Try  Dim inData As Byte() = Convert.FromBase64String(encryptedString)  Try  Dim cs As New CryptoStream(ms, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write)  Try  cs.Write(inData, 0, inData.Length)  cs.FlushFinalBlock()  Finally  cs.Dispose()  End Try   Return Encoding.Default.GetString(ms.ToArray())  Catch  End Try  Finally  ms.Dispose()  End Try  End Function 'Decrypt   '/ 
 '/ 对文件内容进行DES加密  '/ 
 '/ 待加密的文件绝对路径 '/ 加密后的文件保存的绝对路径 Overloads Public Sub EncryptFile(sourceFile As String, destFile As String)  If Not File.Exists(sourceFile) Then  Throw New FileNotFoundException("指定的文件路径不存在！", sourceFile)  End If  Dim btKey As Byte() = Encoding.Default.GetBytes(key)  Dim btIV As Byte() = Encoding.Default.GetBytes(iv)  Dim des As New DESCryptoServiceProvider()  Dim btFile As Byte() = File.ReadAllBytes(sourceFile)   Dim fs As New FileStream(destFile, FileMode.Create, FileAccess.Write)  Try  Try  Dim cs As New CryptoStream(fs, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write)  Try  cs.Write(btFile, 0, btFile.Length)  cs.FlushFinalBlock()  Finally  cs.Dispose()  End Try  Catch  Finally  fs.Close()  End Try  Finally  fs.Dispose()  End Try  End Sub 'EncryptFile   '/ 
 '/ 对文件内容进行DES加密，加密后覆盖掉原来的文件  '/ 
 '/ 待加密的文件的绝对路径 Overloads Public Sub EncryptFile(sourceFile As String)  EncryptFile(sourceFile, sourceFile)  End Sub 'EncryptFile   '/ 
 '/ 对文件内容进行DES解密  '/ 
 '/ 待解密的文件绝对路径 '/ 解密后的文件保存的绝对路径 Overloads Public Sub DecryptFile(sourceFile As String, destFile As String)  If Not File.Exists(sourceFile) Then  Throw New FileNotFoundException("指定的文件路径不存在！", sourceFile)  End If  Dim btKey As Byte() = Encoding.Default.GetBytes(key)  Dim btIV As Byte() = Encoding.Default.GetBytes(iv)  Dim des As New DESCryptoServiceProvider()  Dim btFile As Byte() = File.ReadAllBytes(sourceFile)   Dim fs As New FileStream(destFile, FileMode.Create, FileAccess.Write)  Try  Try  Dim cs As New CryptoStream(fs, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write)  Try  cs.Write(btFile, 0, btFile.Length)  cs.FlushFinalBlock()  Finally  cs.Dispose()  End Try  Catch  Finally  fs.Close()  End Try  Finally  fs.Dispose()  End Try  End Sub 'DecryptFile   '/ 
 '/ 对文件内容进行DES解密，加密后覆盖掉原来的文件  '/ 
 '/ 待解密的文件的绝对路径 Overloads Public Sub DecryptFile(sourceFile As String)  DecryptFile(sourceFile, sourceFile)  End Sub 'DecryptFile  End Class 'DES  End Namespace 'ZU14

VB.NET DES加密使用方法：

Dim des As New ZU14.DES()  des.IV = "abcd哈哈笑" des.Key = "必须八位"  Dim es As String = des.Encrypt("在")  Console.WriteLine(es)  Console.Write(des.Decrypt(es))   des.EncryptFile("d:\a.txt", "d:\b.txt")  des.DecryptFile("d:\b.txt")    Console.ReadKey(True)

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