Endpoint/Common/Interfaces/ISetupToken.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace Mirea.Api.Endpoint.Common.Interfaces;
+
+public interface ISetupToken
+{
+    bool MatchToken(ReadOnlySpan<byte> token);
+    void SetToken(ReadOnlySpan<byte> token);
+}

Endpoint/Configuration/General/SetupTokenService.cs

@@ -0,0 +1,28 @@
+using Mirea.Api.Endpoint.Common.Interfaces;
+using System;
+
+namespace Mirea.Api.Endpoint.Configuration.General;
+
+public class SetupTokenService : ISetupToken
+{
+    public ReadOnlyMemory<byte>? Token { get; private set; }
+
+    public bool MatchToken(ReadOnlySpan<byte> token)
+    {
+        if (Token == null || token.Length != Token.Value.Length)
+            return false;
+
+        var token2 = Token.Value.Span;
+
+        int result = 0;
+        for (int i = 0; i < Token.Value.Length; i++)
+            result |= token2[i] ^ token[i];
+
+        return result == 0;
+    }
+
+    public void SetToken(ReadOnlySpan<byte> token)
+    {
+        Token = token.ToArray();
+    }
+}

Endpoint/Program.cs

@@ -8,6 +8,7 @@ using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Options;
 using Mirea.Api.DataAccess.Application;
 using Mirea.Api.DataAccess.Persistence;
+using Mirea.Api.Endpoint.Common.Interfaces;
 using Mirea.Api.Endpoint.Common.Services;
 using Mirea.Api.Endpoint.Configuration;
 using Mirea.Api.Endpoint.Configuration.General;
@@ -50,6 +51,7 @@ public class Program
         builder.Services.AddPersistence(builder.Configuration.Get<GeneralConfig>()?.DbSettings?.ConnectionStringSql ?? string.Empty);
         builder.Services.AddControllers();
 
+        builder.Services.AddSingleton<ISetupToken, SetupTokenService>();
         builder.Services.AddCors(options =>
         {
             options.AddPolicy("AllowAll", policy =>