✏ 编辑: CMS_get0_eContentType.3

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.\" ========================================================================
.\"
.IX Title "CMS_GET0_TYPE 3"
.TH CMS_GET0_TYPE 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
CMS_get0_type, CMS_set1_eContentType, CMS_get0_eContentType, CMS_get0_content \- get and set CMS content types and content
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fICMS_get0_type()\fR returns the content type of a CMS_ContentInfo structure as
an \s-1ASN1_OBJECT\s0 pointer. An application can then decide how to process the
CMS_ContentInfo structure based on this value.
.PP
\&\fICMS_set1_eContentType()\fR sets the embedded content type of a CMS_ContentInfo
structure. It should be called with \s-1CMS\s0 functions (such as CMS_sign, CMS_encrypt)
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 *\fICMS_get0_eContentType()\fR returns a pointer to the embedded
content type.
.PP
\&\fICMS_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 \fICMS_get0_type()\fR, \fICMS_get0_eContentType()\fR and
\&\fICMS_get0_content()\fR return internal pointers which should \fBnot\fR be freed up.
\&\fICMS_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 \fIOBJ_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 \fICMS_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"
\&\fICMS_get0_type()\fR and \fICMS_get0_eContentType()\fR return an \s-1ASN1_OBJECT\s0 structure.
.PP
\&\fICMS_set1_eContentType()\fR returns 1 for success or 0 if an error occurred.  The
error can be obtained from \fIERR_get_error\fR\|(3).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIERR_get_error\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2008\-2019 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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