02-09-2017
Not clear. What is the problem?
- Do you want to eliminate eval?
- Does the overall logics not deliver what you need? Please be aware that a chain -o (OR operators) stops after the first to evaluate to TRUE.
- How are the two code snippets in above related? What and/or where is filter 5?
- Why does filter 2 work in the first snippet but doesn't in the second.
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LEARN ABOUT CENTOS
bio_new_cms
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
BIO_new_CMS() was added to OpenSSL 1.0.0
1.0.1e 2013-02-11 BIO_new_CMS(3)