=pod

=head1 NAME

OCSP_REQUEST_new, OCSP_REQUEST_free, OCSP_request_add0_id, OCSP_request_sign,
OCSP_request_add1_cert, OCSP_request_onereq_count,
OCSP_request_onereq_get0 - OCSP request functions.

=head1 SYNOPSIS

 #include <openssl/ocsp.h>

 OCSP_REQUEST *OCSP_REQUEST_new(void);
 void OCSP_REQUEST_free(OCSP_REQUEST *req);

 OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid);

 int OCSP_request_sign(OCSP_REQUEST *req,
                       X509 *signer, EVP_PKEY *key, const EVP_MD *dgst,
                       STACK_OF(X509) *certs, unsigned long flags);

 int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert);

 int OCSP_request_onereq_count(OCSP_REQUEST *req);
 OCSP_ONEREQ *OCSP_request_onereq_get0(OCSP_REQUEST *req, int i);

=head1 DESCRIPTION

OCSP_REQUEST_new() allocates and returns an empty B<OCSP_REQUEST> structure.

OCSP_REQUEST_free() frees up the request structure B<req>.

OCSP_request_add0_id() adds certificate ID B<cid> to B<req>. It returns
the B<OCSP_ONEREQ> structure added so an application can add additional
extensions to the request. The B<id> parameter B<MUST NOT> be freed up after
the operation.

OCSP_request_sign() signs OCSP request B<req> using certificate
B<signer>, private key B<key>, digest B<dgst> and additional certificates
B<certs>. If the B<flags> option B<OCSP_NOCERTS> is set then no certificates
will be included in the request.

OCSP_request_add1_cert() adds certificate B<cert> to request B<req>. The
application is responsible for freeing up B<cert> after use.

OCSP_request_onereq_count() returns the total number of B<OCSP_ONEREQ>
structures in B<req>.

OCSP_request_onereq_get0() returns an internal pointer to the B<OCSP_ONEREQ>
contained in B<req> of index B<i>. The index value B<i> runs from 0 to
OCSP_request_onereq_count(req) - 1.

=head1 RETURN VALUES

OCSP_REQUEST_new() returns an empty B<OCSP_REQUEST> structure or B<NULL> if
an error occurred.

OCSP_request_add0_id() returns the B<OCSP_ONEREQ> structure containing B<cid>
or B<NULL> if an error occurred.

OCSP_request_sign() and OCSP_request_add1_cert() return 1 for success and 0
for failure.

OCSP_request_onereq_count() returns the total number of B<OCSP_ONEREQ>
structures in B<req>.

OCSP_request_onereq_get0() returns a pointer to an B<OCSP_ONEREQ> structure
or B<NULL> if the index value is out or range.

=head1 NOTES

An OCSP request structure contains one or more B<OCSP_ONEREQ> structures
corresponding to each certificate.

OCSP_request_onereq_count() and OCSP_request_onereq_get0() are mainly used by
OCSP responders.

=head1 EXAMPLE

Create an B<OCSP_REQUEST> structure for certificate B<cert> with issuer
B<issuer>:

 OCSP_REQUEST *req;
 OCSP_ID *cid;

 req = OCSP_REQUEST_new();
 if (req == NULL)
    /* error */
 cid = OCSP_cert_to_id(EVP_sha1(), cert, issuer);
 if (cid == NULL)
    /* error */

 if (OCSP_REQUEST_add0_id(req, cid) == NULL)
    /* error */

  /* Do something with req, e.g. query responder */

 OCSP_REQUEST_free(req);

=head1 SEE ALSO

L<crypto(3)>,
L<OCSP_cert_to_id(3)>,
L<OCSP_request_add1_nonce(3)>,
L<OCSP_response_find_status(3)>,
L<OCSP_response_status(3)>,
L<OCSP_sendreq_new(3)>

=head1 COPYRIGHT

Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

=cut