RevocationExtensions Class

Extension methods for checking certificate revocation.

namespace WvdS.System.Security.Cryptography.X509Certificates;
 
public static class RevocationExtensions

With existing CRL:

var certificate = new X509Certificate2("user.cer");
byte[] crlData = File.ReadAllBytes("ca.crl");
var caCert = new X509Certificate2("ca.cer");
 
RevocationResult result = certificate.IsRevoked(crlData, caCert, CryptoMode.Hybrid);
 
if (result.Success && result.IsRevoked)
{
    Console.WriteLine($"Certificate revoked on: {result.RevocationDate}");
    Console.WriteLine($"Reason: {result.Reason}");
}

Load CRL automatically:

RevocationResult result = await certificate.CheckRevocationAsync(
    caCert,
    mode: CryptoMode.Hybrid);

using var cache = new CrlCache(defaultCacheDuration: TimeSpan.FromHours(1));
 
// Check with automatic CRL caching
RevocationResult result1 = await cache.CheckRevocationAsync(cert1, caCert);
RevocationResult result2 = await cache.CheckRevocationAsync(cert2, caCert); // CRL from cache

• CertificateRevocationListExtensions
• X509ChainExtensions

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