add securestringjsonconverter

Pilz.Cryptography/SecureStringJsonConverter.cs

@@ -0,0 +1,40 @@
+using Newtonsoft.Json;
+using Pilz.Cryptography;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.IO.Compression;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Pilz.Json.Converters
+{
+    public class SecureStringJsonConverter : JsonConverter
+    {
+        public override bool CanConvert(Type objectType)
+        {
+            return typeof(SecureString).IsAssignableFrom(objectType);
+        }
+
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        {
+            var idString = serializer.Deserialize<string>(reader);
+            SecureString  id;
+
+            if (existingValue is object)
+                id = (SecureString)existingValue;
+            else
+                id = new SecureString();
+
+            id.EncryptedValue = idString;
+
+            return id;
+        }
+
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        {
+            serializer.Serialize(writer, ((SecureString)value).EncryptedValue);
+        }
+    }
+}