ASP.NET MVC5+EF6+EasyUI 后台管理系统（62）-EF链接串加密

来源：互联网发布：网络在线编辑文档编辑：程序博客网时间：2024/06/06 07:41

系列目录

前言：

　　这一节提供一个简单的功能，这个功能看似简单，找了一下没找到EF链接数据库串的加密帮助文档，只能自己写了，这样也更加符合自己的加密要求
有时候我们发布程序为了避免程序外的SQL链接串明文暴露，需要进行一些加密手段！
加密主要分几类：对称加密，非对称加密，散列算法（自己百度脑补，这里不再多说）
我这里选择AES 256位的加密，主要加密速度算法快，安全性高，资源消耗低。
公司一直在使用AES加密来加密一些小数据量的数据，比较方法和安全
　　这是我选择加密AES的理由,当然你可以选择其他有名的加密算法,比如MD5,SHA,3DES.(注：大公司应该都是禁止自行写算法的来加解密的)

知识点：

　数据的使用跟我们登录流程基本都是一样的，获取加密链接串，然后解密使用

　所以我们需要：

加密类
加密工具
EF在何处使用链接字符串

1.加密类

    using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Security.Cryptography;using System.IO;namespace Apps.Common{    public class AESEncryptHelper    {        /// <summary>        /// 获取密钥        /// </summary>        private static string Key        {            get { return @")O[NB]6,YF}+efcaj{+oESb9d8>Z'e9M"; }        }        /// <summary>        /// 获取向量        /// </summary>        private static string IV        {            get { return @"L+\~f4,Ir)b$=pkf"; }        }        #region 参数是byte[]类型        /// <summary>        /// AES加密        /// </summary>        /// <param name="Data">被加密的明文</param>        /// <param name="Key">密钥</param>        /// <param name="Vector">向量</param>        /// <returns>密文</returns>        public static Byte[] AESEncrypt(Byte[] Data, String Key, String Vector)        {            Byte[] bKey = new Byte[32];            Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);            Byte[] bVector = new Byte[16];            Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);            Byte[] Cryptograph = null; // 加密后的密文            Rijndael Aes = Rijndael.Create();            try            {                // 开辟一块内存流                using (MemoryStream Memory = new MemoryStream())                {                    // 把内存流对象包装成加密流对象                    using (CryptoStream Encryptor = new CryptoStream(Memory,                     Aes.CreateEncryptor(bKey, bVector),                     CryptoStreamMode.Write))                    {                        // 明文数据写入加密流                        Encryptor.Write(Data, 0, Data.Length);                        Encryptor.FlushFinalBlock();                        Cryptograph = Memory.ToArray();                    }                }            }            catch            {                Cryptograph = null;            }            return Cryptograph;        }        /// <summary>        /// AES解密        /// </summary>        /// <param name="Data">被解密的密文</param>        /// <param name="Key">密钥</param>        /// <param name="Vector">向量</param>        /// <returns>明文</returns>        public static Byte[] AESDecrypt(Byte[] Data, String Key, String Vector)        {            Byte[] bKey = new Byte[32];            Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);            Byte[] bVector = new Byte[16];            Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);            Byte[] original = null; // 解密后的明文            Rijndael Aes = Rijndael.Create();            try            {                // 开辟一块内存流，存储密文                using (MemoryStream Memory = new MemoryStream(Data))                {                    // 把内存流对象包装成加密流对象                    using (CryptoStream Decryptor = new CryptoStream(Memory,                    Aes.CreateDecryptor(bKey, bVector),                    CryptoStreamMode.Read))                    {                        // 明文存储区                        using (MemoryStream originalMemory = new MemoryStream())                        {                            Byte[] Buffer = new Byte[1024];                            Int32 readBytes = 0;                            while ((readBytes = Decryptor.Read(Buffer, 0, Buffer.Length)) > 0)                            {                                originalMemory.Write(Buffer, 0, readBytes);                            }                            original = originalMemory.ToArray();                        }                    }                }            }            catch            {                original = null;            }            return original;        }        #endregion        #region 参数是string类型              /// <summary>        /// AES加密        /// </summary>        /// <param name="plainStr">明文字符串</param>        /// <returns>密文</returns>        public static string AESEncrypt(string plainStr)        {            byte[] bKey = Encoding.UTF8.GetBytes(Key);            byte[] bIV = Encoding.UTF8.GetBytes(IV);            byte[] byteArray = Encoding.UTF8.GetBytes(plainStr);            string encrypt = null;            Rijndael aes = Rijndael.Create();            using (MemoryStream mStream = new MemoryStream())            {                using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write))                {                    cStream.Write(byteArray, 0, byteArray.Length);                    cStream.FlushFinalBlock();                    encrypt = Convert.ToBase64String(mStream.ToArray());                }            }            aes.Clear();            return encrypt;        }        /// <summary>        /// AES加密        /// </summary>        /// <param name="plainStr">明文字符串</param>        /// <param name="returnNull">加密失败时是否返回 null，false 返回 String.Empty</param>        /// <returns>密文</returns>        public static string AESEncrypt(string plainStr, bool returnNull)        {            string encrypt = AESEncrypt(plainStr);            return returnNull ? encrypt : (encrypt == null ? String.Empty : encrypt);        }        /// <summary>        /// AES解密        /// </summary>        /// <param name="encryptStr">密文字符串</param>        /// <returns>明文</returns>        public static string AESDecrypt(string encryptStr)        {            byte[] bKey = Encoding.UTF8.GetBytes(Key);            byte[] bIV = Encoding.UTF8.GetBytes(IV);            byte[] byteArray = Convert.FromBase64String(encryptStr);            string decrypt = null;            Rijndael aes = Rijndael.Create();            using (MemoryStream mStream = new MemoryStream())            {                using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write))                {                    cStream.Write(byteArray, 0, byteArray.Length);                    cStream.FlushFinalBlock();                    decrypt = Encoding.UTF8.GetString(mStream.ToArray());                }            }            aes.Clear();            return decrypt;        }        /// <summary>        /// AES解密        /// </summary>        /// <param name="encryptStr">密文字符串</param>        /// <param name="returnNull">解密失败时是否返回 null，false 返回 String.Empty</param>        /// <returns>明文</returns>        public static string AESDecrypt(string encryptStr, bool returnNull)        {            string decrypt = AESDecrypt(encryptStr);            return returnNull ? decrypt : (decrypt == null ? String.Empty : decrypt);        }        #endregion        #region 256位AES加密算法        /// <summary>        /// 256位AES加密        /// </summary>        /// <param name="toEncrypt"></param>        /// <returns></returns>        public static string Encrypt(string toEncrypt)        {            // 256-AES key                byte[] keyArray = UTF8Encoding.UTF8.GetBytes(Key);            byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);            RijndaelManaged rDel = new RijndaelManaged();            rDel.Key = keyArray;            rDel.Mode = CipherMode.ECB;            rDel.Padding = PaddingMode.PKCS7;            ICryptoTransform cTransform = rDel.CreateEncryptor();            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);            return Convert.ToBase64String(resultArray, 0, resultArray.Length);        }        /// <summary>        /// 256位AES解密        /// </summary>        /// <param name="toDecrypt"></param>        /// <returns></returns>        public static string Decrypt(string toDecrypt)        {            // 256-AES key                byte[] keyArray = UTF8Encoding.UTF8.GetBytes(Key);            byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);            RijndaelManaged rDel = new RijndaelManaged();            rDel.Key = keyArray;            rDel.Mode = CipherMode.ECB;            rDel.Padding = PaddingMode.PKCS7;            ICryptoTransform cTransform = rDel.CreateDecryptor();            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);            return UTF8Encoding.UTF8.GetString(resultArray);        }        #endregion    }}

AESEncryptHelper.cs

网上一抓一大把，自己搜索想要的加密类啦！

2.加密工具

加密工具这个网上抓不到，需要自己结合加密类来开发，这个不用我带领大伙来开发吧，好吧

新建一个WinFrom程序，命名Apps.EncryptHelper,引用你加密类的所在的类库，或者直接放到Apps.EncryptHelper下就可以

从工具栏拉取2个TextBox和2个Button排版好，基本页面就做完了，最后分别双击两个按钮进入事件实现代码

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;using Apps.Common;namespace Apps.EncryptHelper{    public partial class Encrypt : Form    {        public Encrypt()        {            InitializeComponent();        }        //加密        private void btnEncrypt_Click(object sender, EventArgs e)        {            if (string.IsNullOrEmpty(txtSourceText.Text))            {                MessageBox.Show("没数据加毛密-_-!");                return;            }            else            {               txtResultText.Text = AESEncryptHelper.Encrypt(txtSourceText.Text);            }        }        //解密        private void btnDecrypt_Click(object sender, EventArgs e)        {            if (string.IsNullOrEmpty(txtSourceText.Text))            {                MessageBox.Show("没数据解毛密-_-!");                return;            }            else if (!IsBase64Formatted(txtSourceText.Text))            {                MessageBox.Show("别逗了,我只认识被我加过密的？");                return;            }            else            {                txtResultText.Text = AESEncryptHelper.Decrypt(txtSourceText.Text);            }        }        public static bool IsBase64Formatted(string input)        {            try            {                Convert.FromBase64String(input);                return true;            }            catch            {                return false;            }        }    }}

几十行代码，解决车房老婆问题！运行....

3.结合进EF

这块还是比较容易搞定的

第一：找到web.config的connectionStrings的EF链接串

第二：把修改对应Key串的Value

  <connectionStrings>    <add name="DBContainer" connectionString="ka7ocMA8nEYPjbQYUlVwbsmTeIdxKGE+ZfXAu3/0eMhVRP+iN+9ECpY/lItoY9vfZVDA9EVgmMzH/8Z0rxRIhGPRhVMFWliBuJ9RDGtHbqRY02voyLbrZ7IiXRnXyhlLFsvgj23KXnHl8J6jxB1QNsmuUxPlqnD6HP9y5RQq2EJ//OT+uKqhVC1qUqVzdY+XR6HX/O5jGk6kJGk3Nk83qo09eBOundO7OdxQG9SXPUYNyZjhyx9YV2/1UbghuxHrxHrAuxiE4mJLqH/rusjAy8d3LS/ROiiBszSY+I400Ce4NigDwZaG679yvBKBQ5pg" providerName="System.Data.EntityClient" />  </connectionStrings>

第三：找到EF读取串的地方

这里必须读取解密后发的字符串，所以我们再写一个方法来获取解密后的字符串ConfigPara

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Apps.Common{    public class ConfigPara    {        public static string EFDBConnection {            get {                string connection = System.Configuration.ConfigurationManager.ConnectionStrings["DBContainer"].ConnectionString;                return AESEncryptHelper.Decrypt(connection);            }        }    }}

注意修改后也是没有用的，会回档，因为这个类是根据T4生成的，所以我们必须修改T4

修改对应红框的位置！

搞破坏的，难道你现在还能看懂我的连接串？:-)

ok。实现加密，运行正常

大家赶快把他继承到系统里面！

谢谢大家！

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