C# DES加密/解密字符串

using System;
using System.Text;
using System.Security.Cryptography;
using System.IO;
//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;
     }

}

你可能感兴趣的:(字符串)