How can I programmatically get the Subject Key Identifier as a byte array from an X509 certificate.

(Just to show that I tried before posting)

I would like the output as a byte array, not text, so tracing the X509_print_fp() gave clues but not an answer.

I have the general sense that it's within x509->cert_info_extensions, and that I use NID_subject_key_identifier to extract an extension from the stack. Then I perhaps get the ASN1 object from the extension and from there the value.

Any leads?

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