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 }; //定义密钥byte[] IV = { 55, 103, 246, 79, 36, 99, 167, 3 };  //定义偏移量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("加密时候出现错误!错误提示:\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 }; //定义密钥byte[] IV = { 55, 103, 246, 79, 36, 99, 167, 3 };   //定义偏移量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("解密时候出现错误!错误提示:\n" + ex.Message);}}}
}

public partial class Form1 : Form{public Form1(){InitializeComponent();}private void btnCreate_Click(object sender, EventArgs e){if (string.IsNullOrEmpty(txtClear.Text)){MessageBox.Show("明文不能为空！");}if (string.IsNullOrEmpty(txtKey.Text)){MessageBox.Show("密钥不能为空！");}string strCipher = Encrypt.MD5Encrypt(txtClear.Text, txtKey.Text);txtCipher.Text = strCipher;}}

public class ConfigHelper{/// <summary>/// 获取普通连接/// </summary>public static string GetConn(string conn){return ConfigurationManager.ConnectionStrings[conn].ConnectionString;}/// <summary>/// 获取appsetting/// </summary>public static string GetAppSetting(string key){return ConfigurationManager.AppSettings[key];}/// <summary>/// 获取解密连接/// </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());}}