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CMS_get0_type(3)                    OpenSSL                   CMS_get0_type(3)


NAME

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


SYNOPSIS

        #include <openssl/cms.h>

        const ASN1_OBJECT *CMS_get0_type(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);


DESCRIPTION

       CMS_get0_type() returns the content type of a CMS_ContentInfo structure
       as and 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 with
       the CMS_PARTIAL flag and 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 ASN1_OCTET_STRING pointer
       containing the embedded content.


NOTES

       As the 0 implies CMS_get0_type(), CMS_get0_eContentType() and
       CMS_get0_content() return internal pointers which should not be freed
       up.  CMS_set1_eContentType() copies the supplied OID and it should be
       freed up after use.

       The ASN1_OBJECT values returned can be converted to an integer 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
       ASN1_OCTET_STRING content pointer. That means that for example:

        ASN1_OCTET_STRING **pconf = CMS_get0_content(cms);

       *pconf could be NULL if there is no embedded content. Applications can
       access, modify or create the embedded content in a 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.


RETURN VALUES

       CMS_get0_type() and CMS_get0_eContentType() return and 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).


SEE ALSO

       ERR_get_error(3)


HISTORY

       CMS_get0_type(), CMS_set1_eContentType() and CMS_get0_eContentType()
       were all first added to OpenSSL 0.9.8

1.0.2h                            2016-05-03                  CMS_get0_type(3)

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