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CMS_get0_type.3

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.\" ========================================================================
.\"
.IX Title "CMS_get0_type 3"
.TH CMS_get0_type 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
.Vb 1
\& CMS_get0_type, CMS_set1_eContentType, CMS_get0_eContentType, CMS_get0_content \- get and set CMS content types and content
.Ve
.SH "SYNOPSIS"
.IX 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
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBCMS_get0_type()\fR 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.
.PP
\&\fBCMS_set1_eContentType()\fR sets the embedded content type of a CMS_ContentInfo
structure. It should be called with \s-1CMS\s0 functions with the \fB\s-1CMS_PARTIAL\s0\fR
flag and \fBbefore\fR the structure is finalised, otherwise the results are
undefined.
.PP
\&\s-1ASN1_OBJECT\s0 *\fBCMS_get0_eContentType()\fR returns a pointer to the embedded
content type.
.PP
\&\fBCMS_get0_content()\fR returns a pointer to the \fB\s-1ASN1_OCTET_STRING\s0\fR pointer
containing the embedded content.
.SH "NOTES"
.IX Header "NOTES"
As the \fB0\fR implies \fBCMS_get0_type()\fR, \fBCMS_get0_eContentType()\fR and
\&\fBCMS_get0_content()\fR return internal pointers which should \fBnot\fR be freed up.
\&\fBCMS_set1_eContentType()\fR copies the supplied \s-1OID\s0 and it \fBshould\fR be freed up
after use.
.PP
The \fB\s-1ASN1_OBJECT\s0\fR values returned can be converted to an integer \fB\s-1NID\s0\fR value
using \fBOBJ_obj2nid()\fR. For the currently supported content types the following
values are returned:
.PP
.Vb 6
\& NID_pkcs7_data
\& NID_pkcs7_signed
\& NID_pkcs7_digest
\& NID_id_smime_ct_compressedData:
\& NID_pkcs7_encrypted
\& NID_pkcs7_enveloped
.Ve
.PP
The return value of \fBCMS_get0_content()\fR is a pointer to the \fB\s-1ASN1_OCTET_STRING\s0\fR
content pointer. That means that for example:
.PP
.Vb 1
\& ASN1_OCTET_STRING **pconf = CMS_get0_content(cms);
.Ve
.PP
\&\fB*pconf\fR could be \s-1NULL\s0 if there is no embedded content. Applications can
access, modify or create the embedded content in a \fBCMS_ContentInfo\fR structure
using this function. Applications usually will not need to modify the
embedded content as it is normally set by higher level functions.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBCMS_get0_type()\fR and \fBCMS_get0_eContentType()\fR return and \s-1ASN1_OBJECT\s0 structure.
.PP
\&\fBCMS_set1_eContentType()\fR returns 1 for success or 0 if an error occurred.  The
error can be obtained from \fBERR_get_error\fR\|(3).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_get_error\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBCMS_get0_type()\fR, \fBCMS_set1_eContentType()\fR and \fBCMS_get0_eContentType()\fR were all
first added to OpenSSL 0.9.8

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