1gnutls_x509_crt_get_issuer_alt_name(3g)nutlgsnutls_x509_crt_get_issuer_alt_name(3)
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NAME

6       gnutls_x509_crt_get_issuer_alt_name - API function
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SYNOPSIS

9       #include <gnutls/x509.h>
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11       int     gnutls_x509_crt_get_issuer_alt_name(gnutls_x509_crt_t     cert,
12       unsigned int seq, void * ian, size_t * ian_size, unsigned int *  criti‐
13       cal);
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ARGUMENTS

16       gnutls_x509_crt_t cert
17                   should contain a gnutls_x509_crt_t type
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19       unsigned int seq
20                   specifies  the  sequence  number of the alt name (0 for the
21                   first one, 1 for the second etc.)
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23       void * ian  is the place where the alternative name will be copied to
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25       size_t * ian_size
26                   holds the size of ian.
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28       unsigned int * critical
29                   will be non-zero if the extension  is  marked  as  critical
30                   (may be null)
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DESCRIPTION

33       This  function  retrieves the Issuer Alternative Name (2.5.29.18), con‐
34       tained in the given certificate in the X509v3 Certificate Extensions.
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36       When the SAN type is otherName, it will extract the data in the  other‐
37       Name's  value field, and GNUTLS_SAN_OTHERNAME is returned.  You may use
38       gnutls_x509_crt_get_subject_alt_othername_oid() to get the  correspond‐
39       ing OID and the "virtual" SAN types (e.g., GNUTLS_SAN_OTHERNAME_XMPP).
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41       If  an otherName OID is known, the data will be decoded.  Otherwise the
42       returned data will be DER encoded, and you will have to decode it your‐
43       self.   Currently,  only  the RFC 3920 id-on-xmppAddr Issuer AltName is
44       recognized.
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RETURNS

47       the alternative issuer name type on  success,  one  of  the  enumerated
48       gnutls_x509_subject_alt_name_t.   It  will  return  GNUTLS_E_SHORT_MEM‐
49       ORY_BUFFER if  ian_size is not large enough to hold the value.  In that
50       case  ian_size will be updated with the required size.  If the certifi‐
51       cate does not have an Alternative name with the specified sequence num‐
52       ber then GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE is returned.
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SINCE

55       2.10.0
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REPORTING BUGS

58       Report bugs to <bugs@gnutls.org>.
59       Home page: https://www.gnutls.org
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63       Copyright © 2001-2019 Free Software Foundation, Inc., and others.
64       Copying  and  distribution  of this file, with or without modification,
65       are permitted in any medium  without  royalty  provided  the  copyright
66       notice and this notice are preserved.
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SEE ALSO

69       The  full  documentation  for gnutls is maintained as a Texinfo manual.
70       If the /usr/share/doc/gnutls/ directory does not contain the HTML  form
71       visit
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73       https://www.gnutls.org/manual/
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75gnutls                               3.6.g8nutls_x509_crt_get_issuer_alt_name(3)
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