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=pod
=head1 NAME
CMS_get0_type, CMS_set1_eContentType, CMS_get0_eContentType, CMS_get0_content - get and set CMS content types and content
=head1 SYNOPSIS
#include <openssl/cms.h>
const ASN1_OBJECT *CMS_get0_type(const CMS_ContentInfo *cms);
int CMS_set1_eContentType(CMS_ContentInfo *cms, const ASN1_OBJECT *oid);
const ASN1_OBJECT *CMS_get0_eContentType(CMS_ContentInfo *cms);
ASN1_OCTET_STRING **CMS_get0_content(CMS_ContentInfo *cms);
=head1 DESCRIPTION
CMS_get0_type() returns the content type of a CMS_ContentInfo structure as
an ASN1_OBJECT pointer. An application can then decide how to process the
CMS_ContentInfo structure based on this value.
CMS_set1_eContentType() sets the embedded content type of a CMS_ContentInfo
structure. It should be called with CMS functions (such as L<CMS_sign>, L<CMS_encrypt>)
with the B<CMS_PARTIAL>
flag and B<before> the structure is finalised, otherwise the results are
undefined.
ASN1_OBJECT *CMS_get0_eContentType() returns a pointer to the embedded
content type.
CMS_get0_content() returns a pointer to the B<ASN1_OCTET_STRING> pointer
containing the embedded content.
=head1 NOTES
As the B<0> implies CMS_get0_type(), CMS_get0_eContentType() and
CMS_get0_content() return internal pointers which should B<not> be freed up.
CMS_set1_eContentType() copies the supplied OID and it B<should> be freed up
after use.
The B<ASN1_OBJECT> values returned can be converted to an integer B<NID> value
using OBJ_obj2nid(). For the currently supported content types the following
values are returned:
NID_pkcs7_data
NID_pkcs7_signed
NID_pkcs7_digest
NID_id_smime_ct_compressedData:
NID_pkcs7_encrypted
NID_pkcs7_enveloped
The return value of CMS_get0_content() is a pointer to the B<ASN1_OCTET_STRING>
content pointer. That means that for example:
ASN1_OCTET_STRING **pconf = CMS_get0_content(cms);
B<*pconf> could be NULL if there is no embedded content. Applications can
access, modify or create the embedded content in a B<CMS_ContentInfo> structure
using this function. Applications usually will not need to modify the
embedded content as it is normally set by higher level functions.
=head1 RETURN VALUES
CMS_get0_type() and CMS_get0_eContentType() return an ASN1_OBJECT structure.
CMS_set1_eContentType() returns 1 for success or 0 if an error occurred. The
error can be obtained from ERR_get_error(3).
=head1 SEE ALSO
L<ERR_get_error(3)>
=head1 COPYRIGHT
Copyright 2008-2019 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
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