C#字符串加密解密方法实例

本文实例讲述了C#字符串加密解密方法。分享给大家供大家参考。具体如下：

#region 加密字符串 public static string Encrypt(string str)

/// <summary>

/// 加密字符串

/// </summary>

/// <param name=”str”>要加密的字符串</param>

/// <returns>返回加密后的字符串</returns>

public static string Encrypt(string str)

{

DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();  //实例化加/解密类对象

byte[] key = Encoding.Unicode.GetBytes(encryptKey); //定义字节数组，用来存储密钥

byte[] data = Encoding.Unicode.GetBytes(str);//定义字节数组，用来存储要加密的字符串

MemoryStream MStream = new MemoryStream();//实例化内存流对象

//使用内存流实例化加密流对象

CryptoStream CStream = new CryptoStream(MStream,descsp.CreateEncryptor(key, key), CryptoStreamMode.Write);

CStream.Write(data,0, data.Length);  //向加密流中写入数据

CStream.FlushFinalBlock();             //释放加密流

return Convert.ToBase64String(MStream.ToArray());//返回加密后的字符串

}

#endregion

#region 解密字符串   public static string Decrypt(string str)

/// <summary>

/// 解密字符串

/// </summary>

/// <param name=”str”>要解密的字符串</param>

/// <returns>返回解密后的字符串</returns>

public static string Decrypt(string str)

{

DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();  //实例化加/解密类对象

byte[] key = Encoding.Unicode.GetBytes(encryptKey); //定义字节数组，用来存储密钥

byte[] data = Convert.FromBase64String(str);//定义字节数组，用来存储要解密的字符串

MemoryStream MStream = new MemoryStream();//实例化内存流对象

//使用内存流实例化解密流对象

CryptoStream CStream = new CryptoStream(MStream, descsp.CreateDecryptor(key, key), CryptoStreamMode.Write);

CStream.Write(data,0, data.Length);      //向解密流中写入数据

CStream.FlushFinalBlock();              //释放解密流

return Encoding.Unicode.GetString(MStream.ToArray());      //返回解密后的字符串

}

#endregion

#endregion