1. AES Encryption/Decryption Tool

2. Encrypted Connection string 3. Added API Security using ApiKey
2024-04-28 13:22:57 +05:30
parent 4c6f9a4ba8
commit 21e02ab3ca
14 changed files with 308 additions and 20 deletions
@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
@@ -0,0 +1,138 @@
+// See https://aka.ms/new-console-template for more information
+using System.Security.Cryptography;
+
+string keyBase64;
+string cipherText;
+string vectorBase64;
+string plainText;
+
+Console.WriteLine("Welcome to the Aes Encryption/Decryption tool");
+Select:
+Console.WriteLine("Please select the action you want to perform: /n Press 1 to Generate Key. /n Press 2 to Encrypt using the key. /n Press 3 to Decrpt using the key.");
+
+string? action = Console.ReadLine();
+
+if (action == null || !int.TryParse(action, out int actionId) || !new List<int>{ 1, 2, 3 }.Contains(actionId))
+{
+    Console.WriteLine("Invalid option. /n");
+    goto Select;
+}
+
+switch (actionId)
+{
+    case 1:
+            Console.WriteLine("Creating Aes Encryption 256 bit key");
+            using (Aes aesAlgorithm = Aes.Create())
+            {
+                aesAlgorithm.KeySize = 256;
+                aesAlgorithm.GenerateKey();
+                keyBase64 = Convert.ToBase64String(aesAlgorithm.Key);
+                Console.WriteLine($"Aes Key Size : {aesAlgorithm.KeySize}");
+                Console.WriteLine("Here is the Aes key in Base64:");
+                Console.WriteLine(keyBase64);
+            }
+            break;
+    case 2:
+        Console.WriteLine("Encrypt Text");
+        Console.WriteLine("Provide the Aes Key in base64 format :");
+        keyBase64 = Console.ReadLine();
+        Console.WriteLine("--------------------------------------------------------------");
+        Console.WriteLine("Please enter the text that you want to encrypt:");
+        plainText = Console.ReadLine();
+        Console.WriteLine("--------------------------------------------------------------");
+        cipherText = EncryptDataWithAes(plainText, keyBase64, out vectorBase64);
+
+        Console.WriteLine("--------------------------------------------------------------");
+        Console.WriteLine("Here is the cipher text with vector:");
+        Console.WriteLine(cipherText + ":" + vectorBase64);
+        break;
+    case 3:
+        Console.WriteLine("Please enter the text that you want to decrypt:");
+        cipherText = Console.ReadLine();
+        Console.WriteLine("--------------------------------------------------------------");
+
+        Console.WriteLine("Provide the Aes Key:");
+        keyBase64 = Console.ReadLine();
+        Console.WriteLine("--------------------------------------------------------------");
+
+        vectorBase64 = cipherText.Split(":")[1];
+        cipherText = cipherText.Split(":")[0];
+
+        plainText = DecryptDataWithAes(cipherText, keyBase64, vectorBase64);
+
+        Console.WriteLine("--------------------------------------------------------------");
+        Console.WriteLine("Here is the decrypted data:");
+        Console.WriteLine(plainText);
+        break;
+}
+
+goto Select;
+
+
+static string EncryptDataWithAes(string plainText, string keyBase64, out string vectorBase64)
+{
+    using (Aes aesAlgorithm = Aes.Create())
+    {
+        aesAlgorithm.Key = Convert.FromBase64String(keyBase64);
+        aesAlgorithm.GenerateIV();
+        Console.WriteLine($"Aes Cipher Mode : {aesAlgorithm.Mode}");
+        Console.WriteLine($"Aes Padding Mode: {aesAlgorithm.Padding}");
+        Console.WriteLine($"Aes Key Size : {aesAlgorithm.KeySize}");
+
+        //set the parameters with out keyword
+        vectorBase64 = Convert.ToBase64String(aesAlgorithm.IV);
+
+        // Create encryptor object
+        ICryptoTransform encryptor = aesAlgorithm.CreateEncryptor();
+
+        byte[] encryptedData;
+
+        //Encryption will be done in a memory stream through a CryptoStream object
+        using (MemoryStream ms = new MemoryStream())
+        {
+            using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
+            {
+                using (StreamWriter sw = new StreamWriter(cs))
+                {
+                    sw.Write(plainText);
+                }
+                encryptedData = ms.ToArray();
+            }
+        }
+
+        return Convert.ToBase64String(encryptedData);
+    }
+}
+
+static string DecryptDataWithAes(string cipherText, string keyBase64, string vectorBase64)
+{
+    using (Aes aesAlgorithm = Aes.Create())
+    {
+        aesAlgorithm.Key = Convert.FromBase64String(keyBase64);
+        aesAlgorithm.IV = Convert.FromBase64String(vectorBase64);
+
+        Console.WriteLine($"Aes Cipher Mode : {aesAlgorithm.Mode}");
+        Console.WriteLine($"Aes Padding Mode: {aesAlgorithm.Padding}");
+        Console.WriteLine($"Aes Key Size : {aesAlgorithm.KeySize}");
+        Console.WriteLine($"Aes Block Size : {aesAlgorithm.BlockSize}");
+
+
+        // Create decryptor object
+        ICryptoTransform decryptor = aesAlgorithm.CreateDecryptor();
+
+        byte[] cipher = Convert.FromBase64String(cipherText);
+
+        //Decryption will be done in a memory stream through a CryptoStream object
+        using (MemoryStream ms = new MemoryStream(cipher))
+        {
+            using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
+            {
+                using (StreamReader sr = new StreamReader(cs))
+                {
+                    return sr.ReadToEnd();
+                }
+            }
+        }
+    }
+}
+