On Monday, June 17, 2013 12:21:44 PM UTC-4, [email protected] wrote:
>
> I have successfully built/run the sample "Crypto++ GCM Test.zip", but my
> understanding is not enough to figure out how to prepare the
> AuthenticatedEncryptionFilter::ChannelPut with istream & ostream
> for files. Can someone point me a the right direction?
>
Use a FileSource (http://www.cryptopp.com/wiki/FileSource). FileSource has
an overloaded constructor that takes an istream
(http://www.cryptopp.com/docs/ref/class_file_source.html).
So it will look something like:
GCM< AES >::Decryption decrypter;
decrypter.SetKeyWithIV( key, sizeof(key), iv, sizeof(iv) );
...
istream& istrm = ...
string decrypted;
FileSource ifile(istrm, true,
new AuthenticatedDecryptionFilter(
decrypter,
new StringSink(decrypted),
THROW_EXCEPTION | MAC_AT_END,
TAG_SIZE)
);
ifile.MessageEnd();
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