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SecureBank.API/SecureBank.API.Encryption/EncryptionConfiguration.cs

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+using Microsoft.Extensions.Configuration;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SecureBank.API.Encryption
+{
+    public class EncryptionConfiguration
+    {
+        #region PROPERTIES
+
+        public byte[] Key { get; private set; }
+        public byte[] IV { get; private set; }
+
+        #endregion
+
+
+
+        #region CONSTRUCTORS
+
+        public EncryptionConfiguration(IConfiguration configuration)
+        {
+            Key = Encoding.UTF8.GetBytes(configuration.GetSection("Encryption")["Key"]);
+            IV = Encoding.UTF8.GetBytes(configuration.GetSection("Encryption")["IV"]);
+        }
+
+        #endregion
+    }
+}

SecureBank.API/SecureBank.API.Encryption/EncryptionHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+using static System.Runtime.InteropServices.JavaScript.JSType;
+
+namespace SecureBank.API.Encryption
+{
+    public class EncryptionHelper
+    {
+        #region SERVICES
+
+        private EncryptionConfiguration _configuration;
+
+        #endregion
+
+
+
+        #region FIELDS
+
+        private Aes _aes;
+
+        #endregion
+
+
+
+        #region CONSTRUCTORS
+
+        public EncryptionHelper(EncryptionConfiguration configuration)
+        {
+            _configuration = configuration;
+
+            _aes = Aes.Create();
+            _aes.Key = _configuration.Key;
+            _aes.IV = _configuration.IV;
+        }
+
+        #endregion
+
+
+
+        #region PUBLIC METHODS
+
+        public byte[] Encrypt(string data)
+        {
+            ICryptoTransform encryptor = _aes.CreateEncryptor(_aes.Key, _aes.IV);
+            using (MemoryStream memoryStream = new MemoryStream())
+            {
+                using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
+                using (StreamWriter streamWriter = new StreamWriter(cryptoStream))
+                {
+                    streamWriter.Write(data);
+                }
+                return memoryStream.ToArray();
+            }
+        }
+
+        public string Decrypt(byte[] data)
+        {
+            ICryptoTransform decryptor = _aes.CreateDecryptor(_configuration.Key, _configuration.IV);
+            using (MemoryStream memoryStream = new MemoryStream(data))
+            using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
+            {
+                byte[] outputBytes = new byte[data.Length];
+                int decryptedByteCount = cryptoStream.Read(outputBytes, 0, outputBytes.Length);
+                return Encoding.UTF8.GetString(outputBytes.Take(decryptedByteCount).ToArray());
+            }
+        }
+
+        #endregion
+    }
+}

SecureBank.API/SecureBank.API.Encryption/SecureBank.API.Encryption.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
+  </ItemGroup>
+
+</Project>