X509_get0_subject_key_id() returns an internal pointer to the subject key identifier of <b>x</b> as an <b>ASN1_OCTET_STRING</b> or <b>NULL</b> if the extension is not present or cannot be parsed.</p>

<p>X509_get0_authority_key_id() returns an internal pointer to the authority key identifier of <b>x</b> as an <b>ASN1_OCTET_STRING</b> or <b>NULL</b> if the extension is not present or cannot be parsed.</p>

<p>X509_get0_authority_issuer() returns an internal pointer to the authority certificate issuer of <b>x