Provides extension methods for CertificateRequest with PQ support.

namespace WvdS.System.Security.Cryptography.X509Certificates
 
public static class CertificateRequestExtensions

This extension class extends System.Security.Cryptography.X509Certificates.CertificateRequest¹⁾.

The extension methods have the same signature as the original methods plus an optional CryptoMode parameter:

// Original .NET
X509Certificate2 CreateSelfSigned(DateTimeOffset notBefore, DateTimeOffset notAfter)
 
// Extension (Drop-In)
X509Certificate2 CreateSelfSigned(DateTimeOffset notBefore, DateTimeOffset notAfter, CryptoMode? mode = null)

When the using namespace is included, the extension method is automatically used.

using WvdS.System.Security.Cryptography;
using WvdS.System.Security.Cryptography.X509Certificates;
 
CryptoConfig.DefaultMode = CryptoMode.Hybrid;
 
using var rsa = RSA.Create(2048);
var request = new CertificateRequest(
    "CN=Server, O=Org, C=DE",
    rsa,
    HashAlgorithmName.SHA256,
    RSASignaturePadding.Pkcs1);
 
request.CertificateExtensions.Add(
    new X509BasicConstraintsExtension(false, false, 0, true));
 
// Hybrid certificate: RSA + ML-DSA
var cert = request.CreateSelfSigned(
    DateTimeOffset.Now,
    DateTimeOffset.Now.AddYears(1));

• X509Certificates Namespace
• X509Certificate2Extensions
• CryptoMode Enum

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