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+.\" ========================================================================
+.\"
+.IX Title "BIO_new_CMS 3"
+.TH BIO_new_CMS 3 "2013-02-11" "1.0.1e" "OpenSSL"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+.Vb 1
+\& BIO_new_CMS \- CMS streaming filter BIO
+.Ve
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/cms.h>
+\&
+\& BIO *BIO_new_CMS(BIO *out, CMS_ContentInfo *cms);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fIBIO_new_CMS()\fR returns a streaming filter \s-1BIO\s0 chain based on \fBcms\fR. The output
+of the filter is written to \fBout\fR. Any data written to the chain is
+automatically translated to a \s-1BER\s0 format \s-1CMS\s0 structure of the appropriate type.
+.SH "NOTES"
+.IX Header "NOTES"
+The chain returned by this function behaves like a standard filter \s-1BIO\s0. It
+supports non blocking I/O. Content is processed and streamed on the fly and not
+all held in memory at once: so it is possible to encode very large structures.
+After all content has been written through the chain \fIBIO_flush()\fR must be called
+to finalise the structure.
+.PP
+The \fB\s-1CMS_STREAM\s0\fR flag must be included in the corresponding \fBflags\fR
+parameter of the \fBcms\fR creation function.
+.PP
+If an application wishes to write additional data to \fBout\fR BIOs should be
+removed from the chain using \fIBIO_pop()\fR and freed with \fIBIO_free()\fR until \fBout\fR
+is reached. If no additional data needs to be written \fIBIO_free_all()\fR can be
+called to free up the whole chain.
+.PP
+Any content written through the filter is used verbatim: no canonical
+translation is performed.
+.PP
+It is possible to chain multiple BIOs to, for example, create a triple wrapped
+signed, enveloped, signed structure. In this case it is the applications
+responsibility to set the inner content type of any outer CMS_ContentInfo
+structures.
+.PP
+Large numbers of small writes through the chain should be avoided as this will
+produce an output consisting of lots of \s-1OCTET\s0 \s-1STRING\s0 structures. Prepending
+a \fIBIO_f_buffer()\fR buffering \s-1BIO\s0 will prevent this.
+.SH "BUGS"
+.IX Header "BUGS"
+There is currently no corresponding inverse \s-1BIO:\s0 i.e. one which can decode
+a \s-1CMS\s0 structure on the fly.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fIBIO_new_CMS()\fR returns a \s-1BIO\s0 chain when successful or \s-1NULL\s0 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), \fICMS_sign\fR\|(3),
+\&\fICMS_encrypt\fR\|(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+\&\fIBIO_new_CMS()\fR was added to OpenSSL 1.0.0