=pod =head1 NAME BIO_new_CMS - CMS streaming filter BIO =head1 SYNOPSIS #include BIO *BIO_new_CMS(BIO *out, CMS_ContentInfo *cms); =head1 DESCRIPTION BIO_new_CMS() returns a streaming filter BIO chain based on B. The output of the filter is written to B. Any data written to the chain is automatically translated to a BER format CMS structure of the appropriate type. =head1 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 B flag must be included in the corresponding B parameter of the B creation function. If an application wishes to write additional data to B BIOs should be removed from the chain using BIO_pop() and freed with BIO_free() until B 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. =head1 BUGS There is currently no corresponding inverse BIO: i.e. one which can decode a CMS structure on the fly. =head1 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). =head1 SEE ALSO L, L, L =head1 HISTORY BIO_new_CMS() was added to OpenSSL 1.0.0 =head1 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 L. =cut