1CMS_GET0_TYPE(3)                    OpenSSL                   CMS_GET0_TYPE(3)
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NAME

6       CMS_get0_type, CMS_set1_eContentType, CMS_get0_eContentType,
7       CMS_get0_content - get and set CMS content types and content
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SYNOPSIS

10        #include <openssl/cms.h>
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12        const ASN1_OBJECT *CMS_get0_type(const CMS_ContentInfo *cms);
13        int CMS_set1_eContentType(CMS_ContentInfo *cms, const ASN1_OBJECT *oid);
14        const ASN1_OBJECT *CMS_get0_eContentType(CMS_ContentInfo *cms);
15        ASN1_OCTET_STRING **CMS_get0_content(CMS_ContentInfo *cms);
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DESCRIPTION

18       CMS_get0_type() returns the content type of a CMS_ContentInfo structure
19       as an ASN1_OBJECT pointer. An application can then decide how to
20       process the CMS_ContentInfo structure based on this value.
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22       CMS_set1_eContentType() sets the embedded content type of a
23       CMS_ContentInfo structure. It should be called with CMS functions (such
24       as CMS_sign, CMS_encrypt) with the CMS_PARTIAL flag and before the
25       structure is finalised, otherwise the results are undefined.
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27       ASN1_OBJECT *CMS_get0_eContentType() returns a pointer to the embedded
28       content type.
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30       CMS_get0_content() returns a pointer to the ASN1_OCTET_STRING pointer
31       containing the embedded content.
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NOTES

34       As the 0 implies CMS_get0_type(), CMS_get0_eContentType() and
35       CMS_get0_content() return internal pointers which should not be freed
36       up.  CMS_set1_eContentType() copies the supplied OID and it should be
37       freed up after use.
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39       The ASN1_OBJECT values returned can be converted to an integer NID
40       value using OBJ_obj2nid(). For the currently supported content types
41       the following values are returned:
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43        NID_pkcs7_data
44        NID_pkcs7_signed
45        NID_pkcs7_digest
46        NID_id_smime_ct_compressedData:
47        NID_pkcs7_encrypted
48        NID_pkcs7_enveloped
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50       The return value of CMS_get0_content() is a pointer to the
51       ASN1_OCTET_STRING content pointer. That means that for example:
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53        ASN1_OCTET_STRING **pconf = CMS_get0_content(cms);
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55       *pconf could be NULL if there is no embedded content. Applications can
56       access, modify or create the embedded content in a CMS_ContentInfo
57       structure using this function. Applications usually will not need to
58       modify the embedded content as it is normally set by higher level
59       functions.
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RETURN VALUES

62       CMS_get0_type() and CMS_get0_eContentType() return an ASN1_OBJECT
63       structure.
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65       CMS_set1_eContentType() returns 1 for success or 0 if an error
66       occurred.  The error can be obtained from ERR_get_error(3).
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SEE ALSO

69       ERR_get_error(3)
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72       Copyright 2008-2019 The OpenSSL Project Authors. All Rights Reserved.
73
74       Licensed under the OpenSSL license (the "License").  You may not use
75       this file except in compliance with the License.  You can obtain a copy
76       in the file LICENSE in the source distribution or at
77       <https://www.openssl.org/source/license.html>.
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811.1.1i                            2021-07-22                  CMS_GET0_TYPE(3)
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