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@deftypefun {int} {gnutls_x509_crt_get_issuer_dn} (gnutls_x509_crt_t @var{cert}, char * @var{buf}, size_t * @var{buf_size})
@var{cert}: should contain a @code{gnutls_x509_crt_t} type
@var{buf}: a pointer to a structure to hold the name (may be null)
@var{buf_size}: initially holds the size of @code{buf}
This function will copy the name of the Certificate issuer in the
provided buffer. The name will be in the form
"C=xxxx,O=yyyy,CN=zzzz" as described in RFC4514. The output string
will be ASCII or UTF-8 encoded, depending on the certificate data.
If @code{buf} is null then only the size will be filled.
This function does not output a fully RFC4514 compliant string, if
that is required see @code{gnutls_x509_crt_get_issuer_dn3()} .
@strong{Returns:} @code{GNUTLS_E_SHORT_MEMORY_BUFFER} if the provided buffer is not
long enough, and in that case the @code{buf_size} will be updated
with the required size. @code{GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE} if
the DN does not exist, or another error value on error. On success 0 is returned.
@end deftypefun
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