encyption wip

Bitvault/AesDecryptor.cs

@@ -0,0 +1,29 @@
+using System.Security.Cryptography;
+
+namespace Bitvault;
+
+public class AesDecryptor :
+    IDecryptor
+{
+    private const int IvSize = 16;
+
+    public string Decrypt(string cipherText, byte[] key)
+    {
+        byte[] cipherData = Convert.FromBase64String(cipherText);
+
+        byte[] iv = new byte[IvSize];
+        Array.Copy(cipherData, 0, iv, 0, IvSize); // Extract the IV from the start of the cipher data
+
+        using var aes = Aes.Create();
+        aes.Key = key;
+        aes.IV = iv;
+
+        using var memoryStream = new MemoryStream(cipherData, IvSize, cipherData.Length - IvSize);
+        using (var decryptor = aes.CreateDecryptor(aes.Key, aes.IV))
+        using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
+        using (var streamReader = new StreamReader(cryptoStream))
+        {
+            return streamReader.ReadToEnd(); // Return the decrypted text
+        }
+    }
+}