Hi Avi,
The flat Gzip requires a deflation level. Similar to:
CryptoPP::Gzip zipper(
new CryptoPP::FileSink (filename.c_str(), true ),
CryptoPP::Gzip::MAX_DEFLATE_LEVEL );
zipper.Put( p, s );
zipper.MessageEnd( );
Unzipping:
std::string decompressed;
CryptoPP::FileSource( filename.c_str(), true,
new CryptoPP::Gunzip(
new CryptoPP::StringSink( decompressed )
) // Gunzip
); // FileSource
When using it in pipelining, you will want the compressor outermost so
that it process data first. Below, data travels from TOP/LEFT to
CENTER/RIGHT.
CryptoPP::CBC_Mode<CryptoPP::AES>::Encryption
Encryptor( key, sizeof(key), iv );
std::string encrypted;
CryptoPP::StringSource( ..., true,
new CryptoPP::Gunzip(
new CryptoPP::StreamTransformationFilter( Encryptor,
new CryptoPP::StringSink( CipherText ) ),
), // STF
CryptoPP::Gzip::MAX_DEFLATE_LEVEL ), // GZip
); // StringSource
Jeff
On 2/8/09, Avi <[email protected]> wrote:
>
> Hi,
>
> Still trying to decipher Crypto++ code..
>
> I want to apply a composition of the following for my plaintext:
> 1. [G]Zip
> 2. Encode
> 3. Authenticate.
>
> From what I understood so far, zipping adds entropy when encoding, so
> I guess I want to be able to perform a full zip of the plaintext
> before moving on to encoding, and I assume the same goes for full
> encoding before authenticating.
>
> Is my assumption correct?
>
> My best understanding is that if I compose like this:
> SomeSource( ... Authnticate( Encode ( GZip( SomeSink() ) ) ) )
>
> Then each byte passes all the filters one after the other before the
> next byte does the same.
> If this is true, then this collides with my above requirement (process
> all bytes before moving on to the next filter).
>
> Can someone please sort this out for me?
>
> Thanks,
>
> Avi.
>
> (*) I have a couple of more issues, but I'd like to remain focused so
> I'll start them in different threads.
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