文件加密及解密

 1 using System; 2 using System.Collections.Generic; 3 using System.Text; 4 using System.IO; 5 using System.Runtime.Serialization; 6 using System.Security.Cryptography; 7  8 namespace Sky.Decrypt 9 {10     /// <summary>11     /// 解密12     /// </summary>13     public class Decryption14     {15         public Decryption()16         {17         }18 19         /// <summary>20         /// 獲取文件內容——字符串21         /// </summary>22         /// <param name="path">文件路徑</param>23         /// <returns>文件內容</returns>24         public string GetString(string path)25         {26             return this.DeserializeFile(path);27         }28 29         /// <summary>30         /// 反序列化文件31         /// </summary>32         /// <param name="path">文件路徑</param>33         /// <returns>文件內容</returns>34         PRivate string DeserializeFile(string path)35         {36             string str = "";37 38             if(!File.Exists(path))39             {40                 throw new Exception("File is not exist!");41             }42 43             IFormatter binaryFormatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();44             using(FileStream fileStream=new FileStream(path,FileMode.Open,Fileaccess.Read))45             {46                 str = (string)binaryFormatter.Deserialize(fileStream);47                 fileStream.Close();48             }49 50             return str;51         }52 53         public string DecryptString(string data,string key)54         {55             string str = string.Empty;56 57             if(string.IsNullOrEmpty(data))58             {59                 throw new Exception("data is empty");60             }61 62             MemoryStream ms = new MemoryStream();63             byte[] myKey = Encoding.UTF8.GetBytes(key);64             byte[] myIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };65 66             DES myProvider = new DESCryptoServiceProvider();67             CryptoStream cs = new CryptoStream(ms, myProvider.CreateDecryptor(myKey, myIV), CryptoStreamMode.Write);68 69             try70             {71                 byte[] bs =Convert.FromBase64String(data);72                 cs.Write(bs, 0, bs.Length);73                 cs.FlushFinalBlock();74                 str = Encoding.UTF8.GetString(ms.ToArray());75             }76             finally77             {78                 cs.Close();79                 ms.Close();80             }81             return str;82         }83     }84 }

加密：

using System;using System.Collections.Generic;using System.Text;using System.Runtime.Serialization;using System.IO;using System.Security.Cryptography;namespace Sky.Encrypt{    /// <summary>    /// 加密    /// </summary>    public class Encryption    {        /// <summary>        /// 生成證書文件        /// </summary>        /// <param name="data">注冊信息</param>        /// <param name="fileName">證書文件路徑</param>        /// <param name="key"></param>        public void GenerateFile(string data,string fileName,string key)        {            string str = this.EncryptString(data, key);            this.SerializeFile(str,fileName);        }        /// <summary>        /// 序列化對象        /// </summary>        /// <param name="data">數據字符串</param>        /// <param name="path">文件路徑</param>        private void SerializeFile(string data, string path)        {            IFormatter binaryFormatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();            if(data!=null)            {                using (FileStream fileStream = new FileStream(path, FileMode.Create, FileAccess.Write))                {                    binaryFormatter.Serialize(fileStream, data);                    fileStream.Close();                }            }        }        public string EncryptString(string data, string key)        {            string str = string.Empty;            if(string.IsNullOrEmpty(data))            {                return str;            }            MemoryStream ms = new MemoryStream();            byte[] myKey = Encoding.UTF8.GetBytes(key);            byte[] myIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };            DES myProvider = new DESCryptoServiceProvider();            CryptoStream cs = new CryptoStream(ms, myProvider.CreateEncryptor(myKey, myIV), CryptoStreamMode.Write);            try            {                byte[] bs = Encoding.UTF8.GetBytes(data);                cs.Write(bs, 0, bs.Length);                cs.FlushFinalBlock();                str = Convert.ToBase64String(ms.ToArray());            }            finally            {                cs.Close();                ms.Close();            }            return str;        }    }}

調用加密文件：

Encryption encry = new Encryption();

string xmldata = File.ReadAllText("文件路徑1");

string data = encry.EncryptString(xmldata,"abcdefgh");//abcdefgh關鍵，密碼

File.WriteAllText("保存到文件2",data);

解密

Decryption decrypt = new Decryption();

string strData = File.ReadAllText("保存到文件2");

string newData = decrypt.DecryptString(strData,"abcdefgh");//abcdefgh加密是的密鑰