Linux 2.6 - man page for bio_new_cms (linux section 3SSL)
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BIO_new_CMS(3SSL) OpenSSL BIO_new_CMS(3SSL)
BIO_new_CMS - CMS streaming filter BIO
BIO *BIO_new_CMS(BIO *out, CMS_ContentInfo *cms);
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.
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
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
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.
There is currently no corresponding inverse BIO: i.e. one which can decode a CMS structure
on the fly.
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).
ERR_get_error(3), CMS_sign(3), CMS_encrypt(3)
BIO_new_CMS() was added to OpenSSL 1.0.0
1.0.0e 2009-09-30 BIO_new_CMS(3SSL)
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