@deftypefun {int} {gnutls_ocsp_req_add_cert} (gnutls_ocsp_req_t @var{req}, gnutls_digest_algorithm_t @var{digest}, gnutls_x509_crt_t @var{issuer}, gnutls_x509_crt_t @var{cert})
@var{req}: should contain a @code{gnutls_ocsp_req_t}  type

@var{digest}: hash algorithm, a @code{gnutls_digest_algorithm_t}  value

@var{issuer}: issuer of  @code{subject} certificate

@var{cert}: certificate to request status for

This function will add another request to the OCSP request for a
particular certificate.  The issuer name hash, issuer key hash, and
serial number fields is populated as follows.  The issuer name and
the serial number is taken from  @code{cert} .  The issuer key is taken
from  @code{issuer} .  The hashed values will be hashed using the  @code{digest} algorithm, normally @code{GNUTLS_DIG_SHA1} .

@strong{Returns:} On success, @code{GNUTLS_E_SUCCESS}  (0) is returned, otherwise a
negative error code is returned.
@end deftypefun