@deftypefun {const char *} {gnutls_pkcs7_get_embedded_data_oid} (gnutls_pkcs7_t @var{pkcs7})
@var{pkcs7}: should contain a gnutls_pkcs7_t type

This function will return the OID of the data embedded in the signature of
the PKCS7 structure. If no data are available then @code{NULL}  will be
returned. The returned value will be valid during the lifetime
of the  @code{pkcs7} structure.

@strong{Returns:} On success, a pointer to an OID string, @code{NULL}  on error.

@strong{Since:} 3.5.5
@end deftypefun