query on key usage OIDs

[SIMON BABY]

Hi Team,
I am looking for openssl APIs to get all the OIDs associated with user
certificate Key usage extension. For example my sample Key usage extension
from the certificate is below:
X509v3 extensions:
            X509v3 Key Usage: critical
                Digital Signature, Key Encipherment

I am looking for the APIs used to get the OIDs associated with  Digital
Signature and Key Encipherment from the certificate.

Reagrds
Simon
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