Ability to access certificate extensions through `Crypto` API `X509Certificate` class

What is the problem this feature will solve?

Key usages (not extend) are completely different and can only be accessed through certificate extension under OID 2.5.29.15 which contains value in a bit array format.

Key usage can have for definition: Digital signature, Non-repudiation, Key encipherment, Data encipherment, Key agreement, Certificate signing, CRL signing, Encipher only, Decipher only.

As of now Crypto API only provides access to Extended Key usage under the x509.keyUsage but does not provide access to the Key Usage through the certificate Extensions part.

What is the feature you are proposing to solve the problem?

Having a method the class x509 that can allow to have access to the Extension part of a certificate through a safe structure.

What alternatives have you considered?

Using 3rd party libraries like PKIjs or Forge, but I would like a native feature instead.

Inizia con l’implementazione di X509Certificate della Node.js Crypto API e il comportamento esistente di x509.keyUsage. Esamina come vengono rappresentate le estensioni dei certificati e OID 2.5.29.15, quindi definisci una struttura sicura per esporre key usage e verifica che la nuova API lo distingua da extended key usage.