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Catalogger.Backend/Database/EncryptionService.cs

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+using System.Security.Cryptography;
+using System.Text;
+
+namespace Catalogger.Backend.Database;
+
+public class EncryptionService(Config config) : IEncryptionService
+{
+    private readonly byte[] _secretKey = Convert.FromBase64String(config.Database.EncryptionKey);
+
+    public byte[] Encrypt(string data)
+    {
+        using var aes = Aes.Create();
+        aes.Key = _secretKey;
+
+        var output = new List<byte>();
+        output.AddRange(aes.IV);
+
+        var plaintext = Encoding.UTF8.GetBytes(data);
+        var ciphertext = aes.EncryptCbc(plaintext, aes.IV);
+
+        output.AddRange(ciphertext);
+        return output.ToArray();
+    }
+
+    public string Decrypt(byte[] input)
+    {
+        using var aes = Aes.Create();
+        aes.Key = _secretKey;
+
+        var iv = input.Take(aes.IV.Length).ToArray();
+        var ciphertext = input.Skip(aes.IV.Length).ToArray();
+        var plaintext = aes.DecryptCbc(ciphertext, iv);
+
+        return Encoding.UTF8.GetString(plaintext);
+    }
+}