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 Decryption
14     {
15         public Decryption()
16         {
17         }
18
19         /// <summary>
20         /// 获取文件内容——字符串
21         /// </summary>
22         /// <param name="path">文件路径</param>
23         /// <returns>文件内容</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">文件路径</param>
33         /// <returns>文件内容</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             try
70             {
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             finally
77             {
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>
        /// 生成证书文件
        /// </summary>
        /// <param name="data">注册信息</param>
        /// <param name="fileName">证书文件路径</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>
        /// 序列化对象
        /// </summary>
        /// <param name="data">数据字符串</param>
        /// <param name="path">文件路径</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;
        }
    }
}

调用加密文件：

Encryption encry = new Encryption();

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

string data = encry.EncryptString(xmldata,"abcdefgh");//abcdefgh关键，密码

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加密是的密钥

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