=pod =head1 NAME CMS_get0_type, CMS_set1_eContentType, CMS_get0_eContentType, CMS_get0_content - get and set CMS content types and content =head1 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); =head1 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 B<CMS_PARTIAL> flag and B<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 B<ASN1_OCTET_STRING> pointer containing the embedded content. =head1 NOTES As the B<0> implies CMS_get0_type(), CMS_get0_eContentType() and CMS_get0_content() return internal pointers which should B<not> be freed up. CMS_set1_eContentType() copies the supplied OID and it B<should> be freed up after use. The B<ASN1_OBJECT> values returned can be converted to an integer B<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 B<ASN1_OCTET_STRING> content pointer. That means that for example: ASN1_OCTET_STRING **pconf = CMS_get0_content(cms); B<*pconf> could be NULL if there is no embedded content. Applications can access, modify or create the embedded content in a B<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. =head1 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). =head1 SEE ALSO L<ERR_get_error(3)|ERR_get_error(3)> =head1 HISTORY CMS_get0_type(), CMS_set1_eContentType() and CMS_get0_eContentType() were all first added to OpenSSL 0.9.8 =cut
