首先是加密，解密類。

using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Security.Cryptography; using System.Text; using System.Threading.Tasks;namespace SqlConnectionEncryp {public class Encrypt{/// <summary> /// MD5加密 /// </summary> public static string MD5Encrypt(string Text, string sKey){DESCryptoServiceProvider des = new DESCryptoServiceProvider();byte[] inputByteArray = Encoding.Default.GetBytes(Text);des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));System.IO.MemoryStream ms = new System.IO.MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();StringBuilder ret = new StringBuilder();foreach (byte b in ms.ToArray()){ret.AppendFormat("{0:X2}", b);}return ret.ToString();}/// <summary> /// MD5解密/// </summary> public static string MD5Decrypt(string Text, string sKey){DESCryptoServiceProvider des = new DESCryptoServiceProvider();int len;len = Text.Length / 2;byte[] inputByteArray = new byte[len];int x, i;for (x = 0; x < len; x++){i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);inputByteArray[x] = (byte)i;}des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));System.IO.MemoryStream ms = new System.IO.MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();return Encoding.Default.GetString(ms.ToArray());}/// <summary>/// TripleDES加密/// </summary>public static string TripleDESEncrypting(string strSource){try{byte[] bytIn = Encoding.Default.GetBytes(strSource);byte[] key = { 42, 16, 93, 156, 78, 4, 218, 32, 15, 167, 44, 80, 26, 20, 155, 112, 2, 94, 11, 204, 119, 35, 184, 197 }; //定義密鑰byte[] IV = { 55, 103, 246, 79, 36, 99, 167, 3 }; //定義偏移量TripleDESCryptoServiceProvider TripleDES = new TripleDESCryptoServiceProvider();TripleDES.IV = IV;TripleDES.Key = key;ICryptoTransform encrypto = TripleDES.CreateEncryptor();System.IO.MemoryStream ms = new System.IO.MemoryStream();CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);cs.Write(bytIn, 0, bytIn.Length);cs.FlushFinalBlock();byte[] bytOut = ms.ToArray();return System.Convert.ToBase64String(bytOut);}catch (Exception ex){throw new Exception("加密時候出現錯誤!錯誤提示:\n" + ex.Message);}}/// <summary>/// TripleDES解密/// </summary>public static string TripleDESDecrypting(string Source){try{byte[] bytIn = System.Convert.FromBase64String(Source);byte[] key = { 42, 16, 93, 156, 78, 4, 218, 32, 15, 167, 44, 80, 26, 20, 155, 112, 2, 94, 11, 204, 119, 35, 184, 197 }; //定義密鑰byte[] IV = { 55, 103, 246, 79, 36, 99, 167, 3 }; //定義偏移量TripleDESCryptoServiceProvider TripleDES = new TripleDESCryptoServiceProvider();TripleDES.IV = IV;TripleDES.Key = key;ICryptoTransform encrypto = TripleDES.CreateDecryptor();System.IO.MemoryStream ms = new System.IO.MemoryStream(bytIn, 0, bytIn.Length);CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);StreamReader strd = new StreamReader(cs, Encoding.Default);return strd.ReadToEnd();}catch (Exception ex){throw new Exception("解密時候出現錯誤!錯誤提示:\n" + ex.Message);}}} } View Code

加密使用MD5Decrypt，自己給定一個密鑰。下面是對連接字符串加密的界面：

代碼和測試效果：

public partial class Form1 : Form{public Form1(){InitializeComponent();}private void btnCreate_Click(object sender, EventArgs e){if (string.IsNullOrEmpty(txtClear.Text)){MessageBox.Show("明文不能為空！");}if (string.IsNullOrEmpty(txtKey.Text)){MessageBox.Show("密鑰不能為空！");}string strCipher = Encrypt.MD5Encrypt(txtClear.Text, txtKey.Text);txtCipher.Text = strCipher;}} View Code

加密的原因是，為客戶開發的某些程序，需要訪問公司（我們自己工作的）在公網的數據庫，但是我們不能將明文數據庫訪問字符串，存放在客戶的應用程序上，最好的辦法就是將其加密。下面就在一個為客戶開發的程序中使用這個加密連接。這里，我將密鑰和密文都寫在了配置文件中。如果用戶猜出我的加密算法，他們可以根據密鑰，可以輕松獲得我的明文。所以，不要傻到直接將密鑰配置命名成key。如果將密鑰寫死在代碼中就不方便控制，客戶反編譯同樣能獲知加密算法和密鑰，從而獲得本來的連接字符串。

下面在獲取連接字符串時，都要對其進行解密，所以構造一個解密類是必要的。

public class ConfigHelper{/// <summary>/// 獲取普通連接/// </summary>public static string GetConn(string conn){return ConfigurationManager.ConnectionStrings[conn].ConnectionString;}/// <summary>/// 獲取appsetting/// </summary>public static string GetAppSetting(string key){return ConfigurationManager.AppSettings[key];}/// <summary>/// 獲取解密連接/// </summary>public static string GetConn(string conn, string key){string strConn = GetConn(conn);string strKey = GetAppSetting(key);return MD5Decrypt(strConn, strKey);}/// <summary> /// MD5解密/// </summary> private static string MD5Decrypt(string Text, string sKey){DESCryptoServiceProvider des = new DESCryptoServiceProvider();int len;len = Text.Length / 2;byte[] inputByteArray = new byte[len];int x, i;for (x = 0; x < len; x++){i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);inputByteArray[x] = (byte)i;}des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));System.IO.MemoryStream ms = new System.IO.MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();return Encoding.Default.GetString(ms.ToArray());}} View Code

下面是解密效果，如果客戶不是專業人士，我們公網數據庫連接就是安全的了：

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總結

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