NAME

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

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);

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.

NOTES

       As the 0 implies CMS_get0_type() and CMS_get0_eContentType() 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

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