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136 .IX Title "BIO_new_CMS 3"
137 .TH BIO_new_CMS 3 "2008-04-10" "1.1.0-dev" "OpenSSL"
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144 \& BIO_new_CMS \- CMS streaming filter BIO
149 .IX Header "SYNOPSIS"
151 \& #include <openssl/cms.h>
153 \& BIO *BIO_new_CMS(BIO *out, CMS_ContentInfo *cms);
156 .IX Header "DESCRIPTION"
157 \&\fIBIO_new_CMS()\fR returns a streaming filter \s-1BIO\s0 chain based on \fBcms\fR. The output
158 of the filter is written to \fBout\fR. Any data written to the chain is
159 automatically translated to a \s-1BER\s0 format \s-1CMS\s0 structure of the appropriate type.
162 The chain returned by this function behaves like a standard filter \s-1BIO\s0. It
163 supports non blocking I/O. Content is processed and streamed on the fly and not
164 all held in memory at once: so it is possible to encode very large structures.
165 After all content has been written through the chain \fIBIO_flush()\fR must be called
166 to finalise the structure.
168 The \fB\s-1CMS_STREAM\s0\fR flag must be included in the corresponding \fBflags\fR
169 parameter of the \fBcms\fR creation function.
171 If an application wishes to write additional data to \fBout\fR BIOs should be
172 removed from the chain using \fIBIO_pop()\fR and freed with \fIBIO_free()\fR until \fBout\fR
173 is reached. If no additional data needs to be written \fIBIO_free_all()\fR can be
174 called to free up the whole chain.
176 Any content written through the filter is used verbatim: no canonical
177 translation is performed.
179 It is possible to chain multiple BIOs to, for example, create a triple wrapped
180 signed, enveloped, signed structure. In this case it is the applications
181 responsibility to set the inner content type of any outer CMS_ContentInfo
184 Large numbers of small writes through the chain should be avoided as this will
185 produce an output consisting of lots of \s-1OCTET\s0 \s-1STRING\s0 structures. Prepending
186 a \fIBIO_f_buffer()\fR buffering \s-1BIO\s0 will prevent this.
189 There is currently no corresponding inverse \s-1BIO:\s0 i.e. one which can decode
190 a \s-1CMS\s0 structure on the fly.
192 .IX Header "RETURN VALUES"
193 \&\fIBIO_new_CMS()\fR returns a \s-1BIO\s0 chain when successful or \s-1NULL\s0 if an error
194 occurred. The error can be obtained from \fIERR_get_error\fR\|(3).
196 .IX Header "SEE ALSO"
197 \&\fIERR_get_error\fR\|(3), \fICMS_sign\fR\|(3),
198 \&\fICMS_encrypt\fR\|(3)
201 \&\fIBIO_new_CMS()\fR was added to OpenSSL 0.9.9