security

Csharp/MD5_test/MD5_test.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29009.5
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MD5_test", "MD5_test\MD5_test.csproj", "{CF581D61-F819-4B98-9CCF-2F7EF7BE19FE}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{CF581D61-F819-4B98-9CCF-2F7EF7BE19FE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CF581D61-F819-4B98-9CCF-2F7EF7BE19FE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CF581D61-F819-4B98-9CCF-2F7EF7BE19FE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CF581D61-F819-4B98-9CCF-2F7EF7BE19FE}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {A6ECF26E-2F67-406F-8BFF-E338A527053C}
+	EndGlobalSection
+EndGlobal

Csharp/MD5_test/MD5_test/App.config

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
+    </startup>
+</configuration>

Csharp/MD5_test/MD5_test/Form1.cs

@@ -0,0 +1,76 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Data.SqlClient;
+using System.Drawing;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace MD5_test
+{
+    public partial class Form1 : Form
+    {
+        public Form1()
+        {
+            InitializeComponent();
+        }
+        string username;  //取出账号
+        string password;  //取出密码
+        private void Button1_Click(object sender, EventArgs e)
+        {
+            username = textBox1.Text.Trim();  //取出账号
+            password = textBox2.Text.Trim();  //取出密码
+
+            //string connstr = ConfigurationManager.ConnectionStrings["connectionString"].ToString(); //读取连接字符串
+            string myConnString = "Data Source=.;Initial Catalog=Test;Persist Security Info=True;User ID=sa;Password=sql";
+            SqlConnection sqlConnection = new SqlConnection(myConnString);  //实例化连接对象
+            sqlConnection.Open();
+            password = EncryptWithMD5(password);
+            string insertStr = "INSERT INTO  usertable32 (userid,password)    " + "VALUES ('" + username + "','" + password + "')";
+            SqlCommand cmd = new SqlCommand(insertStr, sqlConnection);
+            cmd.ExecuteNonQuery();
+            sqlConnection.Close();
+            MessageBox.Show("成功写入");
+        }
+
+        private void Button2_Click(object sender, EventArgs e)
+        {
+            string myConnString = "Data Source=.;Initial Catalog=Test;Persist Security Info=True;User ID=sa;Password=sql";
+            username = textBox1.Text.Trim();  //取出账号
+            SqlConnection sqlConnection = new SqlConnection(myConnString);  //实例化连接对象
+            sqlConnection.Open();
+            string sql = "select userid,password from usertable32 where userid = '" + username + "'";
+            SqlCommand com = new SqlCommand(sql, sqlConnection);
+            SqlDataReader read = com.ExecuteReader();
+            while (read.Read())
+            {
+                string myUsername = read["userid"].ToString();
+                string myPassword = read["password"].ToString();
+                textBox3.Text = myUsername;
+                textBox4.Text = myPassword;
+            }
+            sqlConnection.Close();
+            MessageBox.Show("成功读取");
+        }
+
+
+        public static string EncryptWithMD5(string source)
+        {
+            byte[] sor = Encoding.UTF8.GetBytes(source);
+            MD5 md5 = MD5.Create();
+            byte[] result = md5.ComputeHash(sor);
+            StringBuilder strbul = new StringBuilder(40);
+            for (int i = 0; i < result.Length; i++)
+            {
+                strbul.Append(result[i].ToString("x2"));//加密结果"x2"结果为32位,"x3"结果为48位,"x4"结果为64位
+            }
+            return strbul.ToString();
+        }
+
+
+    }
+}