Certificate Extension
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Key Usage
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`SMI Security for PKIX Extended Key Purpose <https://www.iana.org/assignments/smi-numbers/smi-numbers.xhtml>`_

`RFC 9809 X.509 Certificate Extended Key Usage (EKU) for Configuration, Updates, and Safety-Critical Communication <https://www.rfc-editor.org/rfc/rfc9809.html>`_

`Key Attestation Extension for Certificate Management Protocols <https://datatracker.ietf.org/doc/html/draft-wallace-lamps-key-attestation-ext-01>`_

EE Cert Key Usage
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- X509v3 Key Usage: critical

Digital Signature, Non Repudiation, Key Encipherment, Data Encipherment, Key Agreement

- X509v3 Extended Key Usage:

TLS Web Server Authentication, TLS Web Client Authentication