OpenSSL::X509::Extension::SubjectKeyIdentifier#subject_key_identifier

# File tmp/rubies/ruby-4.0.0/ext/openssl/lib/openssl/x509.rb, line 82
def subject_key_identifier
  ext = find_extension("subjectKeyIdentifier")
  return nil if ext.nil?

  ski_asn1 = ASN1.decode(ext.value_der)
  if ext.critical? || ski_asn1.tag_class != :UNIVERSAL || ski_asn1.tag != ASN1::OCTET_STRING
    raise ASN1::ASN1Error, "invalid extension"
  end

  ski_asn1.value
end