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# 61ssl102d src/openssl/usr/share/man/SMIME_write_CMS.3 1.10 
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.\" ========================================================================
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.IX Title "SMIME_write_CMS 3"
.TH SMIME_write_CMS 3 "2019-12-20" "1.0.2u" "OpenSSL"
.SH "NAME"
.Vb 1
\& SMIME_write_CMS - convert CMS structure to S/MIME format.
.Ve
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/cms.h>
.Ve
.PP
.Vb 1
\& int SMIME_write_CMS(BIO *out, CMS_ContentInfo *cms, BIO *data, int flags);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fISMIME_write_CMS()\fR adds the appropriate \s-1MIME\s0 headers to a \s-1CMS\s0
structure to produce an S/MIME message.
.PP
\&\fBout\fR is the \s-1BIO\s0 to write the data to. \fBcms\fR is the appropriate
\&\fBCMS_ContentInfo\fR structure. If streaming is enabled then the content must be
supplied in the \fBdata\fR argument. \fBflags\fR is an optional set of flags.
.SH "NOTES"
.IX Header "NOTES"
The following flags can be passed in the \fBflags\fR parameter.
.PP
If \fB\s-1CMS_DETACHED\s0\fR is set then cleartext signing will be used, this option only
makes sense for SignedData where \fB\s-1CMS_DETACHED\s0\fR is also set when \fICMS_sign()\fR is
called.
.PP
If the \fB\s-1CMS_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are added to
the content, this only makes sense if \fB\s-1CMS_DETACHED\s0\fR is also set.
.PP
If the \fB\s-1CMS_STREAM\s0\fR flag is set streaming is performed. This flag should only
be set if \fB\s-1CMS_STREAM\s0\fR was also set in the previous call to a CMS_ContentInfo
creation function.
.PP
If cleartext signing is being used and \fB\s-1CMS_STREAM\s0\fR not set then the data must
be read twice: once to compute the signature in \fICMS_sign()\fR and once to output
the S/MIME message.
.PP
If streaming is performed the content is output in \s-1BER\s0 format using indefinite
length constructed encoding except in the case of signed data with detached
content where the content is absent and \s-1DER\s0 format is used.
.SH "BUGS"
.IX Header "BUGS"
\&\fISMIME_write_CMS()\fR always base64 encodes \s-1CMS\s0 structures, there should be an
option to disable this.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fISMIME_write_CMS()\fR returns 1 for success or 0 for failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIERR_get_error\fR\|(3), \fICMS_sign\fR\|(3),
\&\fICMS_verify\fR\|(3), \fICMS_encrypt\fR\|(3)
\&\fICMS_decrypt\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fISMIME_write_CMS()\fR was added to OpenSSL 0.9.8