Ovaj scenarij opisuje izdavanje TLS poslužiteljskog certifikata putem Intermediate-CA. Certifikat omogućuje HTTPS šifriranje za web poslužitelje, API-je i druge TLS-zaštićene usluge.

Što se kreira:

• X.509 v3 poslužiteljski certifikat
• Potpisan s ML-DSA-65 (Post-Quantum)
• Ekstenzije za TLS poslužitelj

using WvdS.Security.Cryptography.X509Certificates.Extensions.PQ;
 
using var ctx = PqCryptoContext.Initialize();
 
// Učitavanje Intermediate-CA
var caCert = ctx.LoadCertificate("intermediate-ca.crt.pem");
var caKey = ctx.LoadPrivateKey("intermediate-ca.key.pem", "CaPassword!");
 
// Učitavanje i verifikacija CSR-a
var csr = ctx.LoadCertificateRequest(File.ReadAllText("server.csr.pem"));
if (!csr.VerifySignature())
    throw new CryptographicException("Nevaljani potpis CSR-a");
 
// Izdavanje poslužiteljskog certifikata
var serverCert = ctx.IssueCertificate(
    csr,
    issuerCert: caCert,
    issuerKey: caKey,
    serialNumber: ctx.GenerateSerialNumber(),
    validDays: 365,  // 1 godina
    extensions: new ExtBuilder()
        // Basic Constraints: Nije CA
        .BasicConstraints(ca: false, critical: true)
        // Key Usage za TLS
        .KeyUsage(KeyUsageFlags.DigitalSignature | KeyUsageFlags.KeyEncipherment, critical: true)
        // Extended Key Usage: Server Auth
        .ExtendedKeyUsage(ExtKeyUsage.ServerAuth)
        // Subject Key Identifier
        .SubjectKeyIdentifier(csr.PublicKey)
        // Authority Key Identifier
        .AuthorityKeyIdentifier(caCert)
        // CRL Distribution Point
        .CrlDistributionPoint("http://crl.example.com/intermediate.crl")
        // OCSP Responder
        .AuthorityInfoAccess(
            ocspUrl: "http://ocsp.example.com",
            caIssuersUrl: "http://ca.example.com/intermediate.crt"
        )
        .Build()
);
 
// Spremanje
serverCert.ToPemFile("server.crt.pem");
 
// Kreiranje lanca certifikata
var chain = $"{serverCert.ToPem()}\n{caCert.ToPem()}";
File.WriteAllText("server-chain.pem", chain);
 
Console.WriteLine("Poslužiteljski certifikat izdan:");
Console.WriteLine($"  Subject: {serverCert.Subject}");
Console.WriteLine($"  Issuer: {serverCert.Issuer}");
Console.WriteLine($"  Serial: {serverCert.SerialNumber}");
Console.WriteLine($"  Vrijedi do: {serverCert.NotAfter:yyyy-MM-dd}");

-----BEGIN CERTIFICATE-----
MIIHxjCCBiagAwIBAgIUP7J2kM9x...
-----END CERTIFICATE-----

-----BEGIN CERTIFICATE-----
(Poslužiteljski certifikat)
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
(Intermediate-CA)
-----END CERTIFICATE-----

server {
    listen 443 ssl;
    server_name www.example.com;
 
    ssl_certificate     /etc/nginx/ssl/server-chain.pem;
    ssl_certificate_key /etc/nginx/ssl/server.key.pem;
 
    ssl_protocols TLSv1.3;
    ssl_prefer_server_ciphers on;
}

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Wolfgang van der Stille @ EMSR DATA d.o.o. - Post-Quantum Cryptography Professional