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