gnutls_certificate_set_retrieve_function2(3)

1gnutls_certificate_set_retrieve_fungcntguintoulnts2l_(sc3e)rtificate_set_retrieve_function2(3)
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NAME

6       gnutls_certificate_set_retrieve_function2 - API function
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SYNOPSIS

9       #include <gnutls/abstract.h>
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11       void  gnutls_certificate_set_retrieve_function2(gnutls_certificate_cre‐
12       dentials_t cred, gnutls_certificate_retrieve_function2 * func);
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ARGUMENTS

15       gnutls_certificate_credentials_t cred
16                   is a gnutls_certificate_credentials_t type.
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18       gnutls_certificate_retrieve_function2 * func
19                   is the callback function
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DESCRIPTION

22       This function sets a callback to be called in  order  to  retrieve  the
23       certificate to be used in the handshake. The callback will take control
24       only if a certificate is requested by the peer.
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26       The callback's function prototype is: int (*callback)(gnutls_session_t,
27       const  gnutls_datum_t*  req_ca_dn,  int  nreqs,  const  gnutls_pk_algo‐
28       rithm_t*  pk_algos,  int  pk_algos_length,   gnutls_pcert_st**   pcert,
29       unsigned int *pcert_length, gnutls_privkey_t * pkey);
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31        req_ca_dn  is  only  used in X.509 certificates.  Contains a list with
32       the CA names that the server considers trusted.  This  is  a  hint  and
33       typically the client should send a certificate that is signed by one of
34       these CAs. These names, when available, are DER encoded. To get a  more
35       meaningful value use the function gnutls_x509_rdn_get().
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37        pk_algos  contains  a  list  with server's acceptable public key algo‐
38       rithms.  The certificate returned should  support  the  server's  given
39       algorithms.
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41        pcert  should contain a single certificate and public key or a list of
42       them.
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44        pcert_length is the size of the previous list.
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46        pkey is the private key.
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48       If the callback function is provided then gnutls will call it,  in  the
49       handshake,  after  the  certificate  request message has been received.
50       All the provided by the callback values will not be released  or  modi‐
51       fied by gnutls.
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53       In server side pk_algos and req_ca_dn are NULL.
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55       The  callback  function should set the certificate list to be sent, and
56       return 0 on success. If no certificate was selected then the number  of
57       certificates  should be set to zero. The value (-1) indicates error and
58       the handshake will be terminated. If both certificates are set  in  the
59       credentials and a callback is available, the callback takes predence.
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SINCE

62       3.0
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REPORTING BUGS

65       Report bugs to <bugs@gnutls.org>.
66       Home page: http://www.gnutls.org
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COPYRIGHT

70       Copyright © 2001-2018 Free Software Foundation, Inc., and others.
71       Copying  and  distribution  of this file, with or without modification,
72       are permitted in any medium  without  royalty  provided  the  copyright
73       notice and this notice are preserved.
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