====== Gestione certificati ======

Esempi compatti per la gestione dei certificati. → **Dettagli:** [[..:verwaltung:start|Scenari gestione]]

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===== Rinnovare certificato (stessa chiave) =====

<code csharp>
var caCert = new X509Certificate2("intermediate-ca.pfx", "password");
var oldCert = new X509Certificate2("server.pfx", "password");

var privateKey = oldCert.GetECDsaPrivateKey();

var request = new CertificateRequest(
    oldCert.SubjectName, (ECDsa)privateKey, HashAlgorithmName.SHA384);

// Riprendere estensioni (tranne SKI)
foreach (var ext in oldCert.Extensions)
    if (ext.Oid?.Value != "2.5.29.14")
        request.CertificateExtensions.Add(ext);

// Nuovo numero seriale
var serial = new byte[20];
RandomNumberGenerator.Fill(serial);
serial[0] &= 0x7F;

var renewedCert = request.Create(caCert,
    DateTimeOffset.UtcNow, DateTimeOffset.UtcNow.AddYears(1), serial);
</code>

→ **Dettagli:** [[..:verwaltung:renewal|Renewal]]

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===== Re-Key (nuova chiave) =====

<code csharp>
var oldCert = new X509Certificate2("server.crt");
using var newKey = ECDsa.Create(ECCurve.NamedCurves.nistP384);

var request = new CertificateRequest(
    oldCert.SubjectName, newKey, HashAlgorithmName.SHA384);

// Riprendere SAN e EKU
if (oldCert.Extensions["2.5.29.17"] is { } san)
    request.CertificateExtensions.Add(san);
if (oldCert.Extensions["2.5.29.37"] is { } eku)
    request.CertificateExtensions.Add(eku);

// Creare nuovo certificato, revocare il vecchio!
</code>

→ **Dettagli:** [[..:verwaltung:rekey|Re-Key]]

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===== Creare CRL =====

<code csharp>
var caCert = new X509Certificate2("intermediate-ca.pfx", "password");
var crlBuilder = new CertificateRevocationListBuilder();

crlBuilder.AddEntry(
    serialNumber: new byte[] { 0x01, 0x23, 0x45 },
    revocationTime: DateTimeOffset.UtcNow,
    reason: X509RevocationReason.KeyCompromise);

var crl = crlBuilder.Build(caCert,
    crlNumber: BitConverter.GetBytes(1L),
    nextUpdate: DateTimeOffset.UtcNow.AddDays(7),
    HashAlgorithmName.SHA384);

File.WriteAllBytes("intermediate.crl", crl);
</code>

→ **Dettagli:** [[..:widerruf:crl_erstellen|Creare CRL]]

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===== Checklist =====

**Prima della scadenza (30 giorni):**
  * Pianificare il rinnovo
  * Decidere tra Renewal o Re-Key

**In caso di compromissione:**
  * Immediatamente Re-Key (nuova chiave!)
  * Revocare vecchio certificato
  * Aggiornare CRL

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<< [[.:start|← Riferimento rapido]] | [[..:verwaltung:start|→ Scenari gestione (Dettagli)]] >>

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

{{tag>kurzreferenz verwaltung renewal rekey crl}}