Learn How to Build a Secure AES Text Encryption App in C# .NET 🔐

Hope you all enjoy the video. Sorry it is a little chopped as showing me typing all of the code would have resulted in the video being an hour long. Here is the source code:

Encryptor class:

using Microsoft.SqlServer.Server;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace EncForTurorial
{
class Encryptor
{
public static string IV = "1a1a1a1a1a1a1a1a";
public static string Key = "1a1a1a1a1a1a1a1a1a1a1a1a1a1a1a13";

public static string Encrypt(string decrypted)
{
byte[] textBytes = ASCIIEncoding.ASCII.GetBytes(decrypted);
AesCryptoServiceProvider endec = new AesCryptoServiceProvider(); ;
endec.BlockSize = 128;
endec.KeySize = 256;
endec.IV = ASCIIEncoding.ASCII.GetBytes(IV);
endec.Key = ASCIIEncoding.ASCII.GetBytes(Key);
endec.Padding = PaddingMode.PKCS7;
endec.Mode = CipherMode.CBC;
ICryptoTransform icrypt = endec.CreateEncryptor(endec.Key, endec.IV);
byte[] enc = icrypt.TransformFinalBlock(textBytes, 0, textBytes.Length);
icrypt.Dispose();
return Convert.ToBase64String(enc);
}

public static string Decrypted(string encrypted)
{
var check = Form1.verify;
string password = Form1.password;

if (check == password)
{
byte[] textbytes = Convert.FromBase64String(encrypted);
AesCryptoServiceProvider endec = new AesCryptoServiceProvider();
endec.BlockSize = 128;
endec.KeySize = 256;
endec.IV = ASCIIEncoding.ASCII.GetBytes(IV);
endec.Key = ASCIIEncoding.ASCII.GetBytes(Key);
endec.Padding = PaddingMode.PKCS7;
endec.Mode = CipherMode.CBC;
ICryptoTransform icrypt = endec.CreateDecryptor(endec.Key, endec.IV);
byte[] enc = icrypt.TransformFinalBlock(textbytes, 0, textbytes.Length);
icrypt.Dispose();



if (Form1.verify == password)
{
return System.Text.ASCIIEncoding.ASCII.GetString(enc);

}
else if (Form1.verify != password)
{
MessageBox.Show("Please use the original key file.");
}
}
return encrypted;
}
}
}

Code for Form1:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace EncForTurorial
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void richTextBox1_TextChanged(object sender, EventArgs e)
{

}

public static string password;
private void button1_Click(object sender, EventArgs e)
{
password = textBox1.Text;
string encm = Encryptor.Encrypt(richTextBox1.Text);
System.IO.File.WriteAllText(@"C:\\privatemessage.txt", encm);

}

private void textBox1_TextChanged(object sender, EventArgs e)
{
password = textBox1.Text;
}

private void button2_Click(object sender, EventArgs e)
{
StreamReader sr = new StreamReader(@"C:\\privatemessage.txt");
string line = sr.ReadLine();

richTextBox1.Text = Encryptor.Decrypted(Convert.ToString(line));



}

public static string verify;
private void textBox2_TextChanged(object sender, EventArgs e)
{
verify = textBox2.Text;
}
}
}


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