Sample server

pyxis.helloworld/Program.cs

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+using System;
+using System.Net;
+using System.Security.Cryptography;
+using System.Security.Cryptography.X509Certificates;
+using System.IO;
+
+namespace pyxis.helloworld
+{
+	class Program
+	{
+		static void Main(string[] args)
+		{
+			Program p = new Program();
+			p.run();
+		}
+
+		public void run()
+		{
+			X509Certificate2 cert_default = this.readKeyAndCert("gemini.key", "gemini.crt");
+			X509Certificate2 cert_alt = this.readKeyAndCert("alt.key", "alt.crt");
+
+			gemini.Server.Server server = new gemini.Server.Server(
+				new IPEndPoint(IPAddress.Loopback, 1965),
+				cert_default
+			);
+			server.AddCertificate("test.l.nucleardog.org", cert_alt);
+
+			server.OnProcessRequest += this.processRequest;
+
+			server.Start();
+
+			Console.WriteLine("[Press Any Key to Continue]");
+			Console.ReadKey();
+
+			server.Stop();
+		}
+
+		public gemini.Protocol.Response processRequest(gemini.Server.Server server, gemini.Protocol.Request request)
+		{
+			gemini.Protocol.Response resp = new gemini.Protocol.Response();
+			resp.setStatus(20);
+			resp.setMeta("text/gemini; charset=utf-8");
+			resp.setBody(System.Text.Encoding.UTF8.GetBytes("Hello, world!"));
+			return resp;
+		}
+
+		private X509Certificate2 readKeyAndCert(string keypath, string certpath)
+		{
+			// Read cert
+			X509Certificate2 cert = new X509Certificate2(certpath);
+
+			// Read key
+			string[] lines = File.ReadAllLines(keypath);
+			string privateKeyString = "";
+			foreach (string line in lines)
+			{
+				privateKeyString += line;
+			}
+			byte[] privateKeyData = Convert.FromBase64String(privateKeyString);
+
+			RSA rsa = RSA.Create();
+			rsa.ImportPkcs8PrivateKey(privateKeyData, out _);
+
+			cert = cert.CopyWithPrivateKey(rsa);
+			cert = new X509Certificate2(cert.Export(X509ContentType.Pfx));
+
+			return cert;
+		}
+	}
+}

pyxis.helloworld/pyxis.helloworld.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\pyxis.gemini\pyxis.gemini.csproj" />
+  </ItemGroup>
+
+</Project>