Pilz/Pilz.Cryptography/SecureStringJsonConverter.cs

using Newtonsoft.Json;
using Pilz.Cryptography;
using System;

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 SecureString)
        {
            id = (SecureString)existingValue;
            id.EncryptedValue = idString;
        }
        else
            id = new SecureString(idString, true);

        return id;
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        serializer.Serialize(writer, ((SecureString)value).EncryptedValue);
    }
}