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=pod
=head1 NAME
ossl_cmp_msg_protect,
ossl_cmp_msg_add_extraCerts
- functions for producing CMP message protection
=head1 SYNOPSIS
#include "cmp_int.h"
int ossl_cmp_msg_protect(OSSL_CMP_CTX *ctx, OSSL_CMP_MSG *msg);
int ossl_cmp_msg_add_extraCerts(OSSL_CMP_CTX *ctx, OSSL_CMP_MSG *msg);
=head1 DESCRIPTION
ossl_cmp_msg_protect() (re-)protects the given message B<msg> using an algorithm
depending on the available context information given in the B<ctx>.
If there is a secretValue it selects PBMAC, else if there is a clCert
it selects Signature and uses B<ossl_cmp_msg_add_extraCerts()>.
It also sets the protectionAlg field in the message header accordingly.
ossl_cmp_msg_add_extraCerts() adds elements to the extraCerts field in the given
message B<msg>. It tries to build the certificate chain of the client cert in
the B<ctx> if present by using certificates in ctx->untrusted_certs;
if no untrusted certs are set, it will at least add the client certificate.
In any case all the certificates explicitly specified to be sent out (i.e.,
B<ctx->extraCertsOut>) are added. Note that it will NOT add the root certificate
of the chain, i.e, the trust anchor (unless it is part of extraCertsOut).
=head1 NOTES
CMP is defined in RFC 4210 (and CRMF in RFC 4211).
=head1 RETURN VALUES
All functions return 1 on success, 0 on error.
=head1 HISTORY
The OpenSSL CMP support was added in OpenSSL 3.0.
=head1 COPYRIGHT
Copyright 2007-2020 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (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
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