C#对字符串加密解密

 

• using System;  
• using System.Collections.Generic;  
• using System.Linq;  
• using System.Text;  
• using System.Security;  
• using System.Security.Cryptography;  
• using System.IO;  
• namespace ConsoleApplication1  
• {  
•     class Program  
•     {  
•         static void Main(string[] args)  
•         {  
•             Console.WriteLine(EncryptDES("aaaaaaaaaaaaaaaa", "22222222"));//加密  
•             Console.WriteLine(DecryptDES(EncryptDES("aaaaaaaaaaaaaaaa", "22222222"), "22222222"));//解密  
•         }  
•         //默认密钥向量  
•         private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };         
•         /// DES加密字符串          
•         /// 待加密的字符串  
•         /// 加密密钥,要求为8位  
•         /// 加密成功返回加密后的字符串，失败返回源串   
•         public static string EncryptDES(string encryptString, string encryptKey)  
•         {  
•             try  
•             {  
•                 byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));  
•                 byte[] rgbIV = Keys;  
•                 byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);  
•                 DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();  
•                 MemoryStream mStream = new MemoryStream();  
•                 CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);  
•                 cStream.Write(inputByteArray, 0, inputByteArray.Length);  
•                 cStream.FlushFinalBlock();  
•                 return Convert.ToBase64String(mStream.ToArray());  
•             }  
•             catch  
•             {  
•                 return encryptString;  
•             }  
•         }  
•         ///   
•         /// DES解密字符串          
•         /// 待解密的字符串  
•         /// 解密密钥,要求为8位,和加密密钥相同  
•         /// 解密成功返回解密后的字符串，失败返源串  
•         public static string DecryptDES(string decryptString, string decryptKey)  
•         {  
•             try  
•             {  
•                 byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);  
•                 byte[] rgbIV = Keys;  
•                 byte[] inputByteArray = Convert.FromBase64String(decryptString);  
•                 DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();  
•                 MemoryStream mStream = new MemoryStream();  
•                 CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);  
•                 cStream.Write(inputByteArray, 0, inputByteArray.Length);  
•                 cStream.FlushFinalBlock();  
•                 return Encoding.UTF8.GetString(mStream.ToArray());  
•             }  
•             catch  
•             {  
•                 return decryptString;  
•             }  
•         }  
•     }  
• }