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137 .IX Title "SMIME_write_CMS 3"
138 .TH SMIME_write_CMS 3 "2009-07-19" "1.0.1n" "OpenSSL"
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145 \& SMIME_write_CMS \- convert CMS structure to S/MIME format.
150 .IX Header "SYNOPSIS"
152 \& #include <openssl/cms.h>
154 \& int SMIME_write_CMS(BIO *out, CMS_ContentInfo *cms, BIO *data, int flags);
157 .IX Header "DESCRIPTION"
158 \&\fISMIME_write_CMS()\fR adds the appropriate \s-1MIME\s0 headers to a \s-1CMS\s0
159 structure to produce an S/MIME message.
161 \&\fBout\fR is the \s-1BIO\s0 to write the data to. \fBcms\fR is the appropriate
162 \&\fBCMS_ContentInfo\fR structure. If streaming is enabled then the content must be
163 supplied in the \fBdata\fR argument. \fBflags\fR is an optional set of flags.
166 The following flags can be passed in the \fBflags\fR parameter.
168 If \fB\s-1CMS_DETACHED\s0\fR is set then cleartext signing will be used, this option only
169 makes sense for SignedData where \fB\s-1CMS_DETACHED\s0\fR is also set when \fICMS_sign()\fR is
172 If the \fB\s-1CMS_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are added to
173 the content, this only makes sense if \fB\s-1CMS_DETACHED\s0\fR is also set.
175 If the \fB\s-1CMS_STREAM\s0\fR flag is set streaming is performed. This flag should only
176 be set if \fB\s-1CMS_STREAM\s0\fR was also set in the previous call to a CMS_ContentInfo
179 If cleartext signing is being used and \fB\s-1CMS_STREAM\s0\fR not set then the data must
180 be read twice: once to compute the signature in \fICMS_sign()\fR and once to output
183 If streaming is performed the content is output in \s-1BER\s0 format using indefinite
184 length constructed encoding except in the case of signed data with detached
185 content where the content is absent and \s-1DER\s0 format is used.
188 \&\fISMIME_write_CMS()\fR always base64 encodes \s-1CMS\s0 structures, there should be an
189 option to disable this.
191 .IX Header "RETURN VALUES"
192 \&\fISMIME_write_CMS()\fR returns 1 for success or 0 for failure.
194 .IX Header "SEE ALSO"
195 \&\fIERR_get_error\fR\|(3), \fICMS_sign\fR\|(3),
196 \&\fICMS_verify\fR\|(3), \fICMS_encrypt\fR\|(3)
197 \&\fICMS_decrypt\fR\|(3)
200 \&\fISMIME_write_CMS()\fR was added to OpenSSL 0.9.8