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.\" ========================================================================
.\"
.IX Title "BIO_NEW_CMS 3"
.TH BIO_NEW_CMS 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
BIO_new_CMS \- CMS streaming filter BIO
.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 STRING\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"
The \fIBIO_new_CMS()\fR function was added in OpenSSL 1.0.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2008\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.