Hi,
I didn't go over the entire thing, but anyways, to the best of my
understanding, Source is something with a static length (i.e. - it
won't change during execution).
Sink is the destination of some byte manipulation and is therefore
subject to be with a size the same / larger / smaller that the Source.
I took me a while to figure the same issue you're dealing with, and
the solution is rather simple: you can use std::string as a byte
array, and as both an ArraySource and an ArraySink.
In fact, here's the declaration of ArraySource from filters.h:
typedef StringSource ArraySource;
The perk of using std::string as an array sink is that it can grow
dynamically.
To summarize:
std::string plainText = "bla-bla-bla";
std::string encryptedText;
ArraySource( (byte*)plainText.data(), plainText.size(),
true, new SomeEncryptionFilter(
new StringSink( encryptedText )
)
);
Now you can get the encrypted bytes like this:
encryptedText.data() and length by encryptedText.size().
Once you grasp this idea, go on and check Dillon Beresford's thread on
a similar subject.
http://groups.google.com/group/cryptopp-users/browse_thread/thread/cf0217017a8e7069
I believe it even addresses your specific case.
Avi.
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