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@deftypefun {int} {gnutls_x509_crq_get_key_purpose_oid} (gnutls_x509_crq_t @var{crq}, int @var{indx}, void * @var{oid}, size_t * @var{sizeof_oid}, unsigned int * @var{critical})
@var{crq}: should contain a @code{gnutls_x509_crq_t} structure
@var{indx}: This specifies which OID to return, use (0) to get the first one
@var{oid}: a pointer to a buffer to hold the OID (may be @code{NULL} )
@var{sizeof_oid}: initially holds the size of @code{oid}
@var{critical}: output variable with critical flag, may be @code{NULL} .
This function will extract the key purpose OIDs of the Certificate
specified by the given index. These are stored in the Extended Key
Usage extension (2.5.29.37). See the GNUTLS_KP_* definitions for
human readable names.
@strong{Returns:} @code{GNUTLS_E_SHORT_MEMORY_BUFFER} if the provided buffer is
not long enough, and in that case the * @code{sizeof_oid} will be
updated with the required size. On success 0 is returned.
@strong{Since:} 2.8.0
@end deftypefun
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