fix(Core.Security): pem-Importprozess in den Initilizer mehetods verschoben

DigitalData.Core.Security/RSAEncryptor.cs

@@ -5,9 +5,17 @@ namespace DigitalData.Core.Security
 {
     public class RSAEncryptor : RSACryptographer, IRSAEncryptor, IRSACryptographer
     {
-        public RSAEncryptor()
-        {
-            _rsa.ImportFromPem(Pem);
+        public override required string Pem
+        { 
+            get => base.Pem;            
+            init
+            {
+                if (string.IsNullOrWhiteSpace(Pem))
+                    throw new InvalidOperationException("Pem cannot be null or empty.");
+
+                _rsa.ImportFromPem(base.Pem);
+                base.Pem = value;
+            }
         }
 
         public byte[] Encrypt(byte[] data) => _rsa.Encrypt(data, Padding);