SignedMessage.cs

using System.Diagnostics.CodeAnalysis;
using NeuroAccess.Nfc.TravelDocuments.Security;
using Waher.Networking;
 
namespace NeuroAccess.Nfc.TravelDocuments.SignedMessages
{
    public class SignedMessage
    {
        private SignedMessage(SignedData Data)
        {
            this.Data = Data;
        }
 
        public static bool TryParse(byte[] RawCertificate, [NotNullWhen(true)] out SignedMessage? Parsed)
        {
            Parsed = null;
 
            if (!ASN1.TryDecodeDer(RawCertificate, out object? Content))
                return false;
 
            return TryParse(Content, out Parsed);
        }
 
        public static bool TryParse(object? Content, [NotNullWhen(true)] out SignedMessage? Parsed)
        {
            Parsed = null;
 
            if (Content is Vector SignedDataVector)
                return TryParse(SignedDataVector, out Parsed);
            else if (Content is SignedData SignedData)
            {
                Parsed = new SignedMessage(SignedData);
                return true;
            }
            else
                return false;
        }
 
        public static bool TryParse(Vector SignedDataVector, [NotNullWhen(true)] out SignedMessage? Parsed)
        {
            foreach (object Item in SignedDataVector.Elements)
            {
                if (TryParse(Item, out Parsed))
                    return true;
            }
 
            Parsed = null;
            return false;
        }
 
        public SignedData Data { get; }
 
        public bool CheckSignature(bool VerifyCertificates)
        {
            return this.CheckSignature(VerifyCertificates, null);
        }
 
        public bool CheckSignature(bool VerifyCertificates, ICommunicationLayer? Client)
        {
            return this.Data.CheckSignature(VerifyCertificates, Client);
        }
    }
}