</b> as a stack of <b>GENERAL_NAME</b> structures or <b>NULL</b> if the extension is not present or cannot be parsed.</p>

<p>X509_get0_authority_serial() returns an internal pointer to the authority certificate serial number of <b>x</b> as an <b>ASN1_INTEGER</b> or <b>NULL</b> if the extension is not present or cannot be parsed.</p>

<p>X509_set_proxy_flag() marks the certificate with the <b>EXFLAG_PROXY</b> flag. This is for the users who need to mark non-RFC3820 proxy certificates as such, as OpenSSL onl