ate issuer certificate of the given certificate <i>x</i>. When such a certificate is found, <i>get_issuer</i> must up-ref and assign it to <i>*issuer</i> and then return 1. Otherwise <i>get_issuer</i> must return 0 if not found and -1 (or 0) on failure. If X509_STORE_set_get_issuer() is not used or <i>get_issuer</i> is NULL then X509_STORE_CTX_get1_issuer() is used as the default implementation.</p>

<p>X509_STORE_set_check_issued() sets the function to check that a given certificate <i>x</i> is issued by t