如何使用Base64进行加密和解密

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//----------------------------- Base64 class --------------------------------------

//---------------------------------------------------------------------------------

//---File: clsBase64

//---Description: The class file to encode string or decode string in base algorithm

//---Author: Knight

//---Created Date: Oct.8, 2005

//---Modified Date: Jul.4, 2006

//---------------------------------------------------------------------------------

//----------------------------{ Base64 class }-------------------------------------

using System;

namespace Base64

{

using System.Text;

/// <summary>

/// Summary description for clsBase64.

/// </summary>

public class clsBase64

{

protected clsBase64()

{

//Avoid to be inited

}

Base64_Algorithm_Implement

/// <summary>

/// Encrypt data based on specific key

/// </summary>

/// <param name="Data">the data to be encrypted</param>

/// <param name="Key">key data</param>

/// <returns>If successfully, return encrypted string; else return NULL</returns>

public static string EncryptData( string Data, string Key )

{

if( Data == null || Data == "" ) return null;

if( Key == null || Key == "" ) return null;

char[] chrEncrypted = GetEncoded( Key.ToCharArray(),

Encoding.Unicode.GetBytes( Data ) );

if( chrEncrypted != null )

return new string( chrEncrypted );

else

return null;

}

/// <summary>

/// Decrypt data based on specific key

/// </summary>

/// <param name="Data">the data to be decrypted</param>

/// <param name="Key">key data</param>

/// <returns>If successfully, return decrypted string; else return NULL</returns>

public static string DecryptData( string Data, string Key )

{

if( Data == null || Data == "" ) return null;

if( Key == null || Key == "" ) return null;

byte[] bDecrypted = GetDecoded( Key.ToCharArray(),

Data.ToCharArray() );

if( bDecrypted != null )

return Encoding.Unicode.GetString( bDecrypted );

else

return null;

}

// 调用如下：

// Encrypt data

string strEncryptedData = Base64.clsBase64.EncryptData( yourData, yourKey );

if( strEncryptedData != null )

MessageBox.Show( strEncryptedData );

// Decrypt data

string strDecryptedData = Base64.clsBase64.DecryptData( yourData, yourKey );

if( strDecryptedData != null )

MessageBox.Show( strDecryptedData );