Updated to use Encryption for smtp_password, and added some QOL features

SendEmail/Form1.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Windows.Forms;
 
-
 namespace SendEmail
 {
     public partial class Form1 : Form
@@ -10,7 +9,7 @@ namespace SendEmail
          * Form1 is the main window for Send2Email
          */
         #region UI
-        public Form1() //Autogenerated Code Block
+        public Form1()
         {
             InitializeComponent();
         }
@@ -42,9 +41,7 @@ namespace SendEmail
                 // Error Message for invalid email
                 MessageBox.Show(email + " is not a valid email address.\r\nPlease enter a valid email address.");
             }
-
         }
-
         #endregion
 
         // Check if enter key is pressed in email address input

SendEmail/Form2.cs

@@ -18,7 +18,7 @@ namespace SendEmail
         int wrongCount = 0; // Counts how many times the password is entered incorrectly
         const int LIMIT = 5; // The amount of times a password can be tried before exiting
 
-        public Form2() //Autogenerated Code Block
+        public Form2()
         {
             InitializeComponent();
         }
@@ -27,7 +27,8 @@ namespace SendEmail
         private void PassButtonClick(object sender, EventArgs e)
         {
             string input = textBox1.Text;
-            if (input == Program.smtp_pass) //If password is correct
+            string encryptedInput = Program.Encrypt(input); // Encrypt the user input
+            if (encryptedInput == Program.smtp_pass) // If encrypted password is correct
             {
                 this.Hide(); // Hide Form2
                 var form3 = new Form3(); // Create Form3

SendEmail/Form3.cs

@@ -24,7 +24,7 @@ namespace SendEmail
         // Default info in the info textbox
         string defaultInfo = "Helpful information about each section will display here when you hover over a textbox with your mouse.";
 
-        public Form3() //Automatically generated codeblock
+        public Form3()
         {
             InitializeComponent();
             SetInfoBox(defaultInfo);
@@ -43,7 +43,7 @@ namespace SendEmail
             hostTB.Text = Program.smtp_host;
             portTB.Text = Program.smtp_port.ToString();
             emailTB.Text = Program.smtp_user;
-            passwordTB.Text = Program.smtp_pass;
+            passwordTB.Text = Program.Decrypt(Program.smtp_pass); // Decrypt password for display
 
             fromTB.Text = Program.mail_from;
             subjectTB.Text = Program.mail_subject;
@@ -63,7 +63,7 @@ namespace SendEmail
             switch (holdName) // Switch through the possible input fields and sets the output to the correct values
             {
                 case "hostTB":
-                    output = "SMTP Host: SMTP Host. At the time of creation, we utalize Google's SMTP server located at smtp.google.com";
+                    output = "SMTP Host: SMTP Host. At the time of creation, we utilize Google's SMTP server located at smtp.google.com";
                     break;
                 case "portTB":
                     output = "SMTP Port: SMTP Port";
@@ -101,13 +101,14 @@ namespace SendEmail
 
         #region Save/Load Configuration
 
+        // Save the configuration data, will overwrite existing settings
         // Save the configuration data, will overwrite existing settings
         private void SaveConfig(object sender, EventArgs e)
         {
             string cfg_host = hostTB.Text;
             string string_cfg_port = portTB.Text;
             string cfg_user = emailTB.Text;
-            string cfg_pass = passwordTB.Text;
+            string cfg_pass = Program.Encrypt(passwordTB.Text); // Encrypt the password
 
             string cfg_from = fromTB.Text;
             string cfg_subject = subjectTB.Text;
@@ -126,29 +127,52 @@ namespace SendEmail
 
             // Write Config file to Program.appPath (default is Appdata/Local/Send2Email)
             WriteFile(json, Program.configName, Program.configFileExt);
+
+            // Close Form3 and open Form1
+            this.Hide();
+            var form1 = new Form1();
+            form1.Closed += (s, args) => this.Close();
+            form1.Show();
         }
 
 
         public static bool LoadConfig() // Boolean method, returns true or false to whatever called LoadConfig
         {
-            //Config filepath
+            // Config filepath in AppData
-            string cfg = Program.appPath + "/" + Program.configFileName;
+            string cfgFilePath = Path.Combine(Program.appPath, Program.configFileName);
+            // Example config filepath in the bin directory of the project
+            string exampleCfgFilePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "example.cfg.json");
 
-            //Check if config file exists
+            // Check if config file exists in AppData
-            bool cExist = File.Exists(cfg);
+            bool cExist = File.Exists(cfgFilePath);
 
             if (!cExist) // If a config doesn't exist
             {
+                // Check if example config exists in the bin directory of the project
+                if (File.Exists(exampleCfgFilePath))
+                {
+                    // Ensure the directory exists
+                    if (!Directory.Exists(Program.appPath))
+                    {
+                        Directory.CreateDirectory(Program.appPath);
+                    }
+
+                    // Copy the example config to the AppData config file path
+                    File.Copy(exampleCfgFilePath, cfgFilePath);
+                }
+                else
+                {
+                    // Display an error message before closing the application
+                    MessageBox.Show("A critical error has occurred. Example configuration file is missing. Please contact IT to resolve this issue.");
                     return false; // Return false for LoadConfig boolean
                 }
-            else //Config file does exist
+            }
-            {
+
             // Create an array to store the configuration file line by line
             string[] cfgFile = ReadFile("cfg", "json");
             string cfgData = ConvertStringArray(cfgFile);
 
             // Get the first line of our configuration
-
             Config config = JsonConvert.DeserializeObject<Config>(cfgData);
 
             Program.smtp_host = config.SMTP_Host;
@@ -165,7 +189,7 @@ namespace SendEmail
 
             return true;
         }
-        }
+
 
         #endregion
 
@@ -174,7 +198,6 @@ namespace SendEmail
         // Create a string array with the lines of text
         public static void WriteFile(string[] data, string fileName, string fileExtension)
         {
-
             string temp = "";
             string file = fileName + "." + fileExtension;
 
@@ -189,7 +212,6 @@ namespace SendEmail
             }
         }
 
-
         public static string[] ReadFile(string fileName, string fileExtension)
         {
             string temp = "";
@@ -223,10 +245,6 @@ namespace SendEmail
         }
 
         #region JSON Config
-        /* Sources 
-         * https://www.newtonsoft.com/json/help/html/SerializingJSON.htm
-         * https://www.newtonsoft.com/json/help/html/SerializeWithJsonSerializerToFile.htm
-         */
         public class Config
         {
             public string SMTP_Host { get; set; }
@@ -256,11 +274,8 @@ namespace SendEmail
                 File_Extensions = file_extensions;
             }
         }
-
         #endregion
 
         #endregion
-
-
     }
 }

SendEmail/Program.cs

@@ -5,6 +5,7 @@ using System.Windows.Forms;
 using System.Globalization;
 using System.Text.RegularExpressions;
 using System.Collections.Generic;
+using System.Security.Cryptography;
 
 namespace SendEmail
 {
@@ -33,23 +34,34 @@ namespace SendEmail
         public static string mail_body;
         public static string mail_delivery;
         public static string file_extensions;
+
+        // Encryption keys (8 bytes for DES)
+        public static string key_secret = "8byteKey";
+        public static string key_public = "byte8Key";
         #endregion
 
         #region Main Method
         [STAThread]
-        static void Main() //Main method, this runs as soon as the software is started
+        static void Main()
         {
             // Set up the basic requirements for a WinForms application
             Application.SetHighDpiMode(HighDpiMode.SystemAware);
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault(false);
 
-            
             bool cont = Form3.LoadConfig(); // Load Configuration method
             if (cont) // If Config exists
+            {
+                if (string.IsNullOrEmpty(smtp_pass)) // Check if password is empty
+                {
+                    // Run first time setup
+                    Application.Run(new Form3());
+                }
+                else
                 {
                     Application.Run(new Form1()); // Open Form1 (Main Window)
                 }
+            }
             else // If Config Doesn't Exist
             {
                 // Display an error message before closing the application
@@ -59,12 +71,85 @@ namespace SendEmail
         }
         #endregion
 
+        #region Encryption Methods
+        public static string Encrypt(string input)
+        {
+            try
+            {
+                string textToEncrypt = input;
+                string ToReturn = "";
+                byte[] secretkeyByte = System.Text.Encoding.UTF8.GetBytes(key_secret);
+                byte[] publickeybyte = System.Text.Encoding.UTF8.GetBytes(key_public);
+                byte[] inputbyteArray = System.Text.Encoding.UTF8.GetBytes(textToEncrypt);
+
+                using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
+                {
+                    des.Mode = CipherMode.CBC;
+                    des.Padding = PaddingMode.PKCS7;
+                    des.Key = publickeybyte;
+                    des.IV = secretkeyByte;
+
+                    using (MemoryStream ms = new MemoryStream())
+                    {
+                        using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
+                        {
+                            cs.Write(inputbyteArray, 0, inputbyteArray.Length);
+                            cs.FlushFinalBlock();
+                            ToReturn = Convert.ToBase64String(ms.ToArray());
+                        }
+                    }
+                }
+
+                return ToReturn;
+            }
+            catch (Exception ex)
+            {
+                throw new Exception(ex.Message, ex.InnerException);
+            }
+        }
+
+        public static string Decrypt(string input)
+        {
+            try
+            {
+                string textToDecrypt = input;
+                string ToReturn = "";
+                byte[] privatekeyByte = System.Text.Encoding.UTF8.GetBytes(key_secret);
+                byte[] publickeybyte = System.Text.Encoding.UTF8.GetBytes(key_public);
+                byte[] inputbyteArray = Convert.FromBase64String(textToDecrypt.Replace(" ", "+"));
+
+                using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
+                {
+                    des.Mode = CipherMode.CBC;
+                    des.Padding = PaddingMode.PKCS7;
+                    des.Key = publickeybyte;
+                    des.IV = privatekeyByte;
+
+                    using (MemoryStream ms = new MemoryStream())
+                    {
+                        using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
+                        {
+                            cs.Write(inputbyteArray, 0, inputbyteArray.Length);
+                            cs.FlushFinalBlock();
+                            ToReturn = System.Text.Encoding.UTF8.GetString(ms.ToArray());
+                        }
+                    }
+                }
+
+                return ToReturn;
+            }
+            catch (Exception ae)
+            {
+                throw new Exception(ae.Message, ae.InnerException);
+            }
+        }
+        #endregion
+
         #region Email Methods
 
         #region IsValidEmail
         // Checks if the email address entered is valid.
-        //Source https://docs.microsoft.com/en-us/dotnet/standard/base-types/how-to-verify-that-strings-are-in-valid-email-format
+        public static bool IsValidEmail(string email)
-        public static bool IsValidEmail(string email) //Accepts an email string and returns true if email is valid
         {
             if (string.IsNullOrWhiteSpace(email)) // Null strings aren't valid so return false
                 return false;
@@ -72,8 +157,7 @@ namespace SendEmail
             try
             {
                 // Normalize the domain
-                email = Regex.Replace(email, @"(@)(.+)$", DomainMapper,
+                email = Regex.Replace(email, @"(@)(.+)$", DomainMapper, RegexOptions.None, TimeSpan.FromMilliseconds(200));
-                                      RegexOptions.None, TimeSpan.FromMilliseconds(200));
 
                 // Examines the domain part of the email and normalizes it.
                 string DomainMapper(Match match)
@@ -98,9 +182,7 @@ namespace SendEmail
 
             try
             {
-                return Regex.IsMatch(email,
+                return Regex.IsMatch(email, @"^[^@\s]+@[^@\s]+\.[^@\s]+$", RegexOptions.IgnoreCase, TimeSpan.FromMilliseconds(250));
-                    @"^[^@\s]+@[^@\s]+\.[^@\s]+$",
-                    RegexOptions.IgnoreCase, TimeSpan.FromMilliseconds(250));
             }
             catch (RegexMatchTimeoutException)
             {
@@ -114,7 +196,6 @@ namespace SendEmail
         // returns filepaths with matching extensions
         public static string[] Attachments()
         {
-
             string[] extensions;
             List<string> output = new List<string>(); // Holds the output
 
@@ -147,17 +228,14 @@ namespace SendEmail
                         output.Add(files[i]); // Add it to the output
                     }
                 }
-
             }
 
             return output.ToArray(); // Return a list of all attachments
         }
-
         #endregion
 
         #region Send Email
-
+        public static void Send(string sendTo)
-        public static void Send(string sendTo) //Send email function. This is where most of the work starts
         {
             string[] getAttachments = Attachments(); // Gets all valid attachment files in Pictures folder
 
@@ -192,136 +270,8 @@ namespace SendEmail
                 MessageBox.Show("A critical error has occured please contact IT \r\n" + ex.ToString());
             }
         }
-
         #endregion
 
         #endregion
     }
 }
-
-
-#region [ARCHIVE]
-/* This code is commented out, but it might be 
- * useful if we ever need to work on the software 
- * again in the future, so I've kept it archived. */
-
-#region [ARCHIVE] Encryption, Decryption
-/*
-//Methods used to encrypt and decrypt a string
-//Source https://www.delftstack.com/howto/csharp/encrypt-and-decrypt-a-string-in-csharp/
-
-public static string Encrypt(string input)
-{
-    try
-    {
-        string textToEncrypt = input;
-        string ToReturn = "";
-        byte[] secretkeyByte = { };
-        secretkeyByte = System.Text.Encoding.UTF8.GetBytes(key_secret);
-        byte[] publickeybyte = { };
-        publickeybyte = System.Text.Encoding.UTF8.GetBytes(key_public);
-        MemoryStream ms = null;
-        CryptoStream cs = null;
-        byte[] inputbyteArray = System.Text.Encoding.UTF8.GetBytes(textToEncrypt);
-        using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
-        {
-            ms = new MemoryStream();
-            cs = new CryptoStream(ms, des.CreateEncryptor(publickeybyte, secretkeyByte), CryptoStreamMode.Write);
-            cs.Write(inputbyteArray, 0, inputbyteArray.Length);
-            cs.FlushFinalBlock();
-            ToReturn = Convert.ToBase64String(ms.ToArray());
-        }
-        return ToReturn;
-    }
-    catch (Exception ex)
-    {
-        throw new Exception(ex.Message, ex.InnerException);
-    }
-}
-
-static string Decrypt(string input)
-{
-    try
-    {
-        string textToDecrypt = input;
-        string ToReturn = "";
-        byte[] privatekeyByte = { };
-        privatekeyByte = System.Text.Encoding.UTF8.GetBytes(key_secret);
-        byte[] publickeybyte = { };
-        publickeybyte = System.Text.Encoding.UTF8.GetBytes(key_public);
-        MemoryStream ms = null;
-        CryptoStream cs = null;
-        byte[] inputbyteArray = new byte[textToDecrypt.Replace(" ", "+").Length];
-        inputbyteArray = Convert.FromBase64String(textToDecrypt.Replace(" ", "+"));
-        using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
-        {
-            ms = new MemoryStream();
-            cs = new CryptoStream(ms, des.CreateDecryptor(publickeybyte, privatekeyByte), CryptoStreamMode.Write);
-            cs.Write(inputbyteArray, 0, inputbyteArray.Length);
-            cs.FlushFinalBlock();
-            Encoding encoding = Encoding.UTF8;
-            ToReturn = encoding.GetString(ms.ToArray());
-        }
-        return ToReturn;
-    }
-    catch (Exception ae)
-    {
-        throw new Exception(ae.Message, ae.InnerException);
-    }
-}
-*/
-#endregion
-
-#region [ARCHIVE] Encrypt/Decrypt Files
-/*
-public static void WriteEncryptedFile(string[] data, string fileName, string fileExtension)
-{
-
-    string temp = "";
-    string file = fileName + "." + fileExtension;
-
-    // Write the string array to a new file named "WriteLines.txt".
-    using (StreamWriter outputFile = new StreamWriter(Path.Combine(appPath, file)))
-    {
-        foreach (string line in data)
-        {
-            temp = Encrypt(line);
-        }
-        outputFile.WriteLine(temp);
-    }
-}
-
-public static string[] ReadEncryptedFile(string fileName, string fileExtension)
-{
-    string temp = "";
-    string file = fileName + "." + fileExtension;
-
-    string[] lines = System.IO.File.ReadAllLines(Path.Combine(appPath, file));
-    string[] output = new string[lines.Length];
-
-    for (int i = 0; i < lines.Length; i++)
-    {
-        temp = Decrypt(lines[i]);
-        output[i] = temp;
-    }
-
-    return output;
-}
-
-*/
-#endregion
-
-#region [ARCHIVE] Keygen 
-/*
-//Used origonally do generate public and secret keys
-public static string GenerateKey(int length)
-{
-    //Random
-    Random rand = new Random();
-    const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
-    return new string(Enumerable.Repeat(chars, length).Select(s => s[rand.Next(s.Length)]).ToArray());
-}
-*/
-#endregion
-
-#endregion

SendEmail/cfg.json

@@ -2,7 +2,7 @@
   "SMTP_Host": "smtp.gmail.com",
   "SMTP_Port": 587,
   "SMTP_User": "email@company.com",
-  "SMTP_Pass": "smtp_password",
+  "SMTP_Pass": "",
   "Mail_From": "email@company.com",
   "Mail_Subject": "Mail Subject Text",
   "Mail_Body": "Mail Body Text",