字符串加密方法

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;

namespace Component
{
    
public class Security
    
{
        
public Security()
        

        
        }


        
//默认密钥向量
        private static byte[] Keys = 0x120x340x560x780x900xAB0xCD0xEF };
        
/// <summary>
        
/// DES加密字符串
        
/// </summary>
        
/// <param name="encryptString">待加密的字符串</param>
        
/// <param name="encryptKey">加密密钥,要求为8位</param>
        
/// <returns>加密成功返回加密后的字符串,失败返回源串</returns>

        public static string EncryptDES(string encryptString, string encryptKey)
        
{
            
try
            
{
                
byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(08));
                
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;
            }

        }


        
/// <summary>
        
/// DES解密字符串
        
/// </summary>
        
/// <param name="decryptString">待解密的字符串</param>
        
/// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
        
/// <returns>解密成功返回解密后的字符串,失败返源串</returns>

        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;
            }

        }
 


    }

}

posted on 2007-01-08 17:50  Daniel Pang  阅读(2596)  评论(1编辑  收藏  举报

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