I would like to know how can I implement general purpose
encryption/decryption filter that can be used with BIO objects.

Basically, filter should get the data before it is written out to the
stream/socket/memory.  This allows my filter to encrypt/decrypt the data
for any kind of source/sink object.

Furthermore, is it possible to implement devices also, if so how can I
do that.  Before I knew BIO concept I had implemented device and filter
using BOOST::Iostream libraries.

BIO seems very attractive concept so far, but I don not know how to
attach my version of device and filter to it.

Thank you,
-Anand
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