On Wednesday, August 2, 2017 at 8:09:55 AM UTC-4, Daniel Karcz wrote:
>
> Hello Everyone,
>
> I'm moving myself from my own C AES C Library to Crypto++.
>
> ...
>
> Can Somebody explain me where exactly in this piece of code encryption have
> place?
> In C library I have function which I have to call to encrypt data, it look
> similar to
>
> encrypt(plain_text, cipher_text, key);
>
> I know that encryption is made in try{} block, but I see only class
> declaration, key setting and after that is StringSource which Is transform
> bytes into string.
>
>
You are using a Pipeline. Obviously, Crypto++ has them just like Unix and
Linux. Also see https://www.cryptopp.com/wiki/Pipelining .
In a pipeline, data flows from a source to a sink. In between there are
filters which transform the data. The Crypto++ code above is a lot like the
following Unix commands:
cat plain.txt | enc -k key -m ecb | hex -e > cipher.txt
The StreamTransformationFilter is the heavy lifter. It accumulates incoming
plain text. It adds padding to the final block. It also accumulates cipher
text until you retireve it. Its a very complex filter.
Another filter is the HexEncoder. Its easy to understand its operation.
You might be interested in https://www.cryptopp.com/wiki/Init-Update-Final.
It kind of presents Crypto++'s objects in a Java-esque kind of way.
Jeff
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