Add docs for CMS_final() and BIO_new_CMS().

doc/crypto/BIO_new_CMS.pod

+=pod
+
+=head1 NAME
+
+BIO_new_CMS - CMS streaming filter BIO
+
+=head1 SYNOPSIS
+
+ #include <openssl/cms.h>
+
+ BIO *BIO_new_CMS(BIO *out, CMS_ContentInfo *cms);
+
+=head1 DESCRIPTION
+
+BIO_new_CMS() returns a streaming filter BIO chain based on B<cms>. The output
+of the filter is written to B<out>. Any data written to the returned BIO
+is automatically translated to a BER format CMS structure.
+
+=head1 NOTES
+
+The BIO returned by this functions behaves like a standard filter BIO. It
+supports non blocking I/O. Content is processes 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 BIO BIO_flush() must be called
+to finalise the structure.
+
+The B<CMS_STREAM> flag must be included in the corresponding B<flags>
+parameter of the B<cms> creation function.
+
+After use BIOs should be removed from the filter using BIO_pop() until
+the output BIO B<out> is reached.
+
+Any content written through the filter is uses "as-is" and 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<ERR_get_error(3)|ERR_get_error(3)>, L<CMS_sign(3)|CMS_sign(3)>,
+L<CMS_encrypt(3)|CMS_encrypt(3)>
+
+=head1 HISTORY
+
+BIO_new_CMS() was added to OpenSSL 0.9.9
+
+=cut

doc/crypto/CMS_final.pod

+=pod
+
+=head1 NAME
+
+CMS_final - finalise a CMS_ContentInfo structure
+
+=head1 SYNOPSIS
+
+ #include <openssl/cms.h>
+
+ int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags);
+
+=head1 DESCRIPTION
+
+CMS_final() finalises the structure B<cms>. It's purpose is to perform any
+operations necessary on B<cms> (digest computation for example) and set the
+appropriate fields. The parameter B<data> contains the content to be 
+processed. The B<dcont> parameter contains a BIO to write content to after
+processing: this is only used with detached data and will usually be set to
+NULL.
+
+=head1 NOTES
+
+This function will normally be called when the B<CMS_PARTIAL> flag is used. It
+should only be used when streaming is not performed because the streaming
+I/O functions perform finalisation operations internally.
+
+=head1 RETURN VALUES
+
+CMS_final() returns 1 for success or 0 for failure.
+
+=head1 SEE ALSO
+
+L<ERR_get_error(3)|ERR_get_error(3)>, L<CMS_sign(3)|CMS_sign(3)>,
+L<CMS_encrypt(3)|CMS_encrypt(3)>
+
+=head1 HISTORY
+
+CMS_final() was added to OpenSSL 0.9.8
+
+=cut