dane_verify_crt(3)                   gnutls                   dane_verify_crt(3)

       dane_verify_crt - API function

       #include <gnutls/dane.h>

       int dane_verify_crt(dane_state_t s, const gnutls_datum_t * chain,
       unsigned chain_size, gnutls_certificate_type_t chain_type, const char *
       hostname, const char * proto, unsigned int port, unsigned int sflags,
       unsigned int vflags, unsigned int * verify);

       dane_state_t s
                   A DANE state structure (may be NULL)

       const gnutls_datum_t * chain
                   A certificate chain

       unsigned chain_size
                   The size of the chain

       gnutls_certificate_type_t chain_type
                   The type of the certificate chain

       const char * hostname
                   The hostname associated with the chain

       const char * proto
                   The protocol of the service connecting (e.g. tcp)

       unsigned int port
                   The port of the service connecting (e.g. 443)

       unsigned int sflags
                   Flags for the initialization of  s (if NULL)

       unsigned int vflags
                   Verification flags; an OR'ed list of dane_verify_flags_t.

       unsigned int * verify
                   An OR'ed list of dane_verify_status_t.

       This function will verify the given certificate chain against the CA
       constrains and/or the certificate available via DANE.  If no information
       via DANE can be obtained the flag DANE_VERIFY_NO_DANE_INFO is set. If a
       DNSSEC signature is not available for the DANE record then the verify
       flag DANE_VERIFY_NO_DNSSEC_DATA is set.

       Due to the many possible options of DANE, there is no single threat model
       countered. When notifying the user about DANE verification results it may
       be better to mention: DANE verification did not reject the certificate,
       rather than mentioning a successful DANE verication.

       Note that this function is designed to be run in addition to PKIX -
       certificate chain - verification. To be run independently the
       DANE_VFLAG_ONLY_CHECK_EE_USAGE flag should be specified; then the
       function will check whether the key of the peer matches the key
       advertized in the DANE entry.

       a negative error code on error and DANE_E_SUCCESS (0) when the DANE
       entries were successfully parsed, irrespective of whether they were
       verified (see  verify for that information). If no usable entries were
       encountered DANE_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.

       Report bugs to <bugs@gnutls.org>.
       Home page: https://www.gnutls.org

       Copyright © 2001- Free Software Foundation, Inc., and others.
       Copying and distribution of this file, with or without modification, are
       permitted in any medium without royalty provided the copyright notice and
       this notice are preserved.

       The full documentation for gnutls is maintained as a Texinfo manual.  If
       the /usr/share/doc/gnutls/ directory does not contain the HTML form visit


gnutls                               3.6.14                   dane_verify_crt(3)