1CMS_get0_type(3)                    OpenSSL                   CMS_get0_type(3)
2
3
4

NAME

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

SYNOPSIS

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

DESCRIPTION

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

NOTES

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

RETURN VALUES

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

SEE ALSO

68       ERR_get_error(3)
69

HISTORY

71       CMS_get0_type(), CMS_set1_eContentType() and CMS_get0_eContentType()
72       were all first added to OpenSSL 0.9.8
73
74
75
761.0.2o                            2018-03-27                  CMS_get0_type(3)