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BIO_NEW_CMS(3)			    OpenSSL			BIO_NEW_CMS(3)

NAME
       BIO_new_CMS - CMS streaming filter BIO

SYNOPSIS
	#include <openssl/cms.h>

	BIO *BIO_new_CMS(BIO *out, CMS_ContentInfo *cms);

DESCRIPTION
       BIO_new_CMS() returns a streaming filter	BIO chain based	on cms.	The
       output of the filter is written to out. Any data	written	to the chain
       is automatically	translated to a	BER format CMS structure of the
       appropriate type.

NOTES
       The chain returned by this function behaves like	a standard filter BIO.
       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 BIO_flush() must be called	to finalise the	structure.

       The CMS_STREAM flag must	be included in the corresponding flags
       parameter of the	cms creation function.

       If an application wishes	to write additional data to out	BIOs should be
       removed from the	chain using BIO_pop() and freed	with BIO_free()	until
       out is reached. If no additional	data needs to be written
       BIO_free_all() can be called to free up the whole chain.

       Any content written through the filter is used verbatim:	no canonical
       translation is performed.

       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.

       Large numbers of	small writes through the chain should be avoided as
       this will produce an output consisting of lots of OCTET STRING
       structures. Prepending a	BIO_f_buffer() buffering BIO will prevent
       this.

BUGS
       There is	currently no corresponding inverse BIO:	i.e. one which can
       decode a	CMS structure on the fly.

RETURN VALUES
       BIO_new_CMS() returns a BIO chain when successful or NULL if an error
       occurred. The error can be obtained from	ERR_get_error(3).

SEE ALSO
       ERR_get_error(3), CMS_sign(3), CMS_encrypt(3)

HISTORY
       The BIO_new_CMS() function was added in OpenSSL 1.0.0.

COPYRIGHT
       Copyright 2008-2016 The OpenSSL Project Authors.	All Rights Reserved.

       Licensed	under the OpenSSL license (the "License").  You	may not	use
       this file except	in compliance with the License.	 You can obtain	a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.

1.1.1d				  2019-09-10			BIO_NEW_CMS(3)

NAME | SYNOPSIS | DESCRIPTION | NOTES | BUGS | RETURN VALUES | SEE ALSO | HISTORY | COPYRIGHT

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