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Title "CMS_get0_type 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
.Vb 1 CMS_get0_type, CMS_set1_eContentType, CMS_get0_eContentType, CMS_get0_content - get and set CMS content types and content .Ve Header "SYNOPSIS" .Vb 1 #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); .Ve Header "DESCRIPTION" \fICMS_get0_type() returns the content type of a CMS_ContentInfo structure as and \s-1ASN1_OBJECT\s0 pointer. An application can then decide how to process the CMS_ContentInfo structure based on this value.

\fICMS_set1_eContentType() sets the embedded content type of a CMS_ContentInfo structure. It should be called with \s-1CMS\s0 functions with the \s-1CMS_PARTIAL\s0 flag and before the structure is finalised, otherwise the results are undefined.

\s-1ASN1_OBJECT\s0 *CMS_get0_eContentType() returns a pointer to the embedded content type.

\fICMS_get0_content() returns a pointer to the \s-1ASN1_OCTET_STRING\s0 pointer containing the embedded content.

Header "NOTES" As the 0 implies CMS_get0_type(), CMS_get0_eContentType() and \fICMS_get0_content() return internal pointers which should not be freed up. \fICMS_set1_eContentType() copies the supplied \s-1OID\s0 and it should be freed up after use.

The \s-1ASN1_OBJECT\s0 values returned can be converted to an integer \s-1NID\s0 value using OBJ_obj2nid(). For the currently supported content types the following values are returned:

.Vb 6 NID_pkcs7_data NID_pkcs7_signed NID_pkcs7_digest NID_id_smime_ct_compressedData: NID_pkcs7_encrypted NID_pkcs7_enveloped .Ve

The return value of CMS_get0_content() is a pointer to the \s-1ASN1_OCTET_STRING\s0 content pointer. That means that for example:

.Vb 1 ASN1_OCTET_STRING **pconf = CMS_get0_content(cms); .Ve

\fB*pconf could be \s-1NULL\s0 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.

Header "RETURN VALUES" \fICMS_get0_type() and CMS_get0_eContentType() return and \s-1ASN1_OBJECT\s0 structure.

\fICMS_set1_eContentType() returns 1 for success or 0 if an error occurred. The error can be obtained from ERR_get_error\|(3).

Header "SEE ALSO" \fIERR_get_error\|(3) Header "HISTORY" \fICMS_get0_type(), CMS_set1_eContentType() and CMS_get0_eContentType() were all first added to OpenSSL 0.9.8