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=head1 NAME

OSSL_CMP_MSG_get0_header
- function(s) manipulating CMP messages

=head1 SYNOPSIS

  #include <openssl/cmp.h>

  OSSL_CMP_PKIHEADER *OSSL_CMP_MSG_get0_header(const OSSL_CMP_MSG *msg);

=head1 DESCRIPTION

OSSL_CMP_MSG_get0_header returns the header of the given CMP message.

=head1 NOTES

CMP is defined in RFC 4210.

=head1 RETURN VALUES

CMP_MSG_get0_header() returns the intended pointer value as described above
or NULL if the respective entry does not exist and on error.

=head1 HISTORY

The OpenSSL CMP support was added in OpenSSL 3.0.

=head1 COPYRIGHT

Copyright 2007-2019 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>.

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