CMS_GET0_TYPE - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMECMS_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(const 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 an 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 (such as CMS_sign, CMS_encrypt) 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.
NOTESAs 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 an 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)
COPYRIGHTCopyright 2008−2019 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the ‟License”). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>. 0
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