feat(RSACryptographerList): Erstellt, um die Cryptographer-Liste sowohl als Wörterbuch als auch als IEnumerable zu verwenden

DigitalData.Core.Security/Cryptographer/RSACryptographerList.cs

@@ -0,0 +1,24 @@
+using DigitalData.Core.Abstractions.Security;
+using System.Collections;
+
+namespace DigitalData.Core.Security.Cryptographer
+{
+    public class RSACryptographerList<TRSACryptographer> : IEnumerable<TRSACryptographer> where TRSACryptographer : IRSACryptographer
+    {
+        private readonly Func<TRSACryptographer, string> _keyGenerator;
+
+        private readonly IEnumerable<TRSACryptographer> _cryptographers;
+
+        internal RSACryptographerList(Func<TRSACryptographer, string> keyGenerator, IEnumerable<TRSACryptographer> cryptographers)
+        {
+            _keyGenerator = keyGenerator;
+            _cryptographers = cryptographers;            
+        }
+
+        public TRSACryptographer? this[string key] => _cryptographers.SingleOrDefault(crypt => _keyGenerator(crypt) == key);
+
+        public IEnumerator<TRSACryptographer> GetEnumerator() => _cryptographers.GetEnumerator();
+
+        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+    }
+}