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Editing: CMS_get0_content.3
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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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