1CMS_get0_type(3)                    OpenSSL                   CMS_get0_type(3)
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NAME

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

9        #include <openssl/cms.h>
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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);
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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.
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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.
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26       ASN1_OBJECT *CMS_get0_eContentType() returns a pointer to the embedded
27       content type.
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29       CMS_get0_content() returns a pointer to the ASN1_OCTET_STRING pointer
30       containing the embedded content.
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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.
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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:
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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
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49       The return value of CMS_get0_content() is a pointer to the
50       ASN1_OCTET_STRING content pointer. That means that for example:
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52        ASN1_OCTET_STRING **pconf = CMS_get0_content(cms);
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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.
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RETURN VALUES

61       CMS_get0_type() and CMS_get0_eContentType() return and ASN1_OBJECT
62       structure.
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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).
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SEE ALSO

68       ERR_get_error(3)
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HISTORY

71       CMS_get0_type(), CMS_set1_eContentType() and CMS_get0_eContentType()
72       were all first added to OpenSSL 0.9.8
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761.0.2o                            2020-08-01                  CMS_get0_type(3)