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Program.cs

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+// See https://aka.ms/new-console-template for more information
+using ConfigurationManager = System.Configuration.ConfigurationManager;
+using System.Collections.Specialized;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace aesencrypt;
+
+public class Program
+{
+    static void encrypt(string plainText, string encryptionKey)
+    {
+        byte[] keyBytes = Encoding.UTF8.GetBytes(encryptionKey);
+
+        using (Aes aes = Aes.Create())
+        {
+            aes.Key = keyBytes;
+            aes.GenerateIV(); // Always generate a new IV
+
+            using (var encryptor = aes.CreateEncryptor(aes.Key, aes.IV))
+            {
+                byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);
+                byte[] encryptedBytes = encryptor.TransformFinalBlock(plainBytes, 0, plainBytes.Length);
+
+                // Combine IV and encrypted data
+                byte[] combinedBytes = new byte[aes.IV.Length + encryptedBytes.Length];
+                Buffer.BlockCopy(aes.IV, 0, combinedBytes, 0, aes.IV.Length);
+                Buffer.BlockCopy(encryptedBytes, 0, combinedBytes, aes.IV.Length, encryptedBytes.Length);
+
+                Console.WriteLine(Convert.ToBase64String(combinedBytes));
+            }
+        }
+    }
+
+    static void decrypt(string plainText,string encryptionKey)
+        {
+            byte[] fullCipher = Convert.FromBase64String(plainText);
+            byte[] iv = new byte[16];
+            byte[] cipher = new byte[fullCipher.Length - iv.Length];
+
+            Buffer.BlockCopy(fullCipher, 0, iv, 0, iv.Length);
+            Buffer.BlockCopy(fullCipher, iv.Length, cipher, 0, cipher.Length);
+
+            byte[] keyBytes = Encoding.UTF8.GetBytes(encryptionKey);
+
+            using (Aes aes = Aes.Create())
+            {
+                aes.Key = keyBytes;
+                aes.IV = iv;
+
+                using (var decryptor = aes.CreateDecryptor(aes.Key, aes.IV))
+                {
+                    byte[] decryptedBytes = decryptor.TransformFinalBlock(cipher, 0, cipher.Length);
+                    Console.WriteLine(Encoding.UTF8.GetString(decryptedBytes));
+                }
+            }
+        }
+    
+        static void Main(string[] args)
+        {
+            var  Initialconfiguration = ConfigurationManager.GetSection("settings") as NameValueCollection;
+            string function = Initialconfiguration["function"];
+            string encryptionKeyUsed = Initialconfiguration["key"];
+            if (function == "encrypt")
+            {
+                Console.WriteLine("What do you want to encrypt?");
+                encrypt(Console.ReadLine(),encryptionKeyUsed);
+            }
+            else if (function == "decrypt")
+            {
+                Console.WriteLine("What do you want to decrypt?");
+                decrypt(Console.ReadLine(),encryptionKeyUsed);
+            }
+            else
+            {
+                Console.WriteLine("Invalid function type");
+            }
+
+        }
+
+}
+