added correct encryptor file

chunks to 128 bit chunks with CBC mode

Author: john-h-k

src/Backend/Encryptor.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.IO;
+using System.Security.Cryptography;
+
+namespace Encryption_App
+{
+    class Encryptor
+    {
+       public void SymEncrypt(string Data)
+       {
+
+       }
+
+       public void SymEncrypt(byte[] bArray, byte[] pwdBytes)
+       {
+            byte[] encryptedBytes = null;
+
+            // Set your salt here, change it to meet your flavor:
+            // The salt bytes must be at least 8 bytes.
+            byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
+
+            using (MemoryStream ms = new MemoryStream())
+            {
+                using (RijndaelManaged AES = new RijndaelManaged())
+                {
+                    AES.KeySize = 256;
+                    AES.BlockSize = 128;
+
+                    var key = new Rfc2898DeriveBytes(pwdBytes, saltBytes, 1000);
+                    AES.Key = key.GetBytes(AES.KeySize / 8);
+                    AES.IV = key.GetBytes(AES.BlockSize / 8);
+
+                    AES.Mode = CipherMode.CBC;
+
+                    using (var cs = new CryptoStream(ms, AES.CreateEncryptor(), CryptoStreamMode.Write))
+                    {
+                        cs.Write(bArray, 0, bArray.Length);
+                        cs.Close();
+                    }
+                    encryptedBytes = ms.ToArray();
+                }
+            }
+
+            
+        }
+
+    }
+}