可以加密字符串，也可以加密字節數組。

采用3-des加密算法，加密鍵只能是16byte(128位)或者是24byte(192位)的，指定的鍵不僅有長度上的要求，還不能是個弱鍵
?（ 注：DES 算法使用 56 位（7 字節）的密鑰）

//調用方法


// 指定加密鍵
string key = "yygmldcsjmdsthcg"; //16byte
CryptionData cd = new CryptionData(key);
string testStr = "SpNumber + “$”+ UserNumber + “$”+ ServiceTag + “$”+ AccessTime";
string result = cd.EncryptionStringData(testStr); // result 已經經過base64編碼
string encodingStr = HttpUtility.UrlEncode(result, System.Text.Encoding.GetEncoding("GB2312"));



//TripleDES類代碼

using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
using System.Web;
using System.Windows.Forms;


public class CryptionData
{
??// The length of Encryptionstring should be 24 byte and not be a weak key
??private string EncryptionString;

??// The length of initialization vector should be 8 byte
??private static Byte[] EncryptionIV = Encoding.Default.GetBytes("abcdefgh");

??/// <summary>
??/// Constructor
??/// </summary>
??public CryptionData()
??{
??}

??/// <summary>
??/// Constructor
??/// </summary>
??/// <param name="EncryptionString">SecureKey</param>
??public CryptionData(string EncryptionString)
??{
????this.EncryptionString = EncryptionString;
??}

??/// <summary>
??/// Encryption method for byte array
??/// </summary>
??/// <param name="SourceData">source data</param>
??/// <returns>byte array</returns>
??public byte[] EncryptionByteData(byte[] SourceData)
??{
????byte[] returnData = null;
????try
????{
??????// Create TripleDESCryptoServiceProvider object
??????TripleDESCryptoServiceProvider desProvider = new TripleDESCryptoServiceProvider();

??????// Set SecureKey and IV of desProvider
??????byte[] byteKey = Encoding.Default.GetBytes(EncryptionString);
??????desProvider.Key = byteKey;
??????desProvider.IV = EncryptionIV;

??????// A MemoryStream object
??????MemoryStream ms = new MemoryStream();

??????// Create Encryptor
??????ICryptoTransform encrypto = desProvider.CreateEncryptor();

??????// Create CryptoStream object
??????CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);

??????// Encrypt SourceData
??????cs.Write(SourceData,0,SourceData.Length);
??????cs.FlushFinalBlock();

??????// Get Encryption result
??????returnData = ms.ToArray();
????}
????catch(Exception ex)
????{
??????throw ex;
????}

????return returnData;

??}

??/// <summary>
??/// Decryption method for byte array
??/// </summary>
??/// <param name="SourceData">source data</param>
??/// <returns>byte array</returns>
??public byte[] DecryptionByteData(byte[] SourceData)
??{
????byte[] returnData = null;
????try
????{
??????// Create TripleDESCryptoServiceProvider object
??????TripleDESCryptoServiceProvider desProvider = new TripleDESCryptoServiceProvider();

??????// Set SecureKey and IV of desProvider
??????byte[] byteKey = Encoding.Default.GetBytes(EncryptionString);
??????desProvider.Key = byteKey;
??????desProvider.IV = EncryptionIV;

??????// A MemoryStream object
??????MemoryStream ms = new MemoryStream();

??????// Create Decryptor
??????ICryptoTransform encrypto = desProvider.CreateDecryptor();

??????// Create CryptoStream object
??????CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);

??????// Decrypt SourceData
??????cs.Write(SourceData, 0, SourceData.Length);
??????cs.FlushFinalBlock();

??????// Get Decryption result
??????returnData = ms.ToArray();
????}
????catch(Exception ex)
????{
??????throw ex;
????}
????return returnData;

??}

??/// <summary>
??/// Encryption method for string
??/// </summary>
??/// <param name="SourceData">source data</param>
??/// <returns>string</returns>
??public string EncryptionStringData(string SourceData)
??{
????try
????{
??????// Convert source data from string to byte array
??????byte[] SourData = Encoding.Default.GetBytes(SourceData);

??????// Encrypt byte array
??????byte[] retData = EncryptionByteData(SourData);

??????// Convert encryption result from byte array to Base64String
??????return Convert.ToBase64String(retData, 0, retData.Length);
????}
????catch(Exception ex)
????{
??????throw ex;
????}
??}

??/// <summary>
??/// Decryption method for string
??/// </summary>
??/// <param name="SourceData">source data</param>
??/// <returns>string</returns>
??public string DecryptionStringdata(string SourceData)
??{
????try
????{
??????// Convert source data from Base64String to byte array
??????byte[] SourData = Convert.FromBase64String(SourceData);

??????// Decrypt byte array
??????byte[] retData = DecryptionByteData(SourData);

??????// Convert Decryption result from byte array to string
??????return Encoding.Default.GetString(retData, 0, retData.Length);
????}
????catch(Exception ex)
????{
??????throw ex;
????}
??}
}

轉載于:https://www.cnblogs.com/yoyozhou/archive/2006/10/12/527080.html

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