On Wednesday, July 10, 2013 6:08:06 PM UTC-4, Steven wrote:
>
> I'm using df.put(... and df.get(... on large files, even though the file
> is
> successfully decrypted, I get no exceptions to tell me why authentication
> is
> failing. Is there an alternative method to verify authentication when not
> using Channels?
>
You have to attach an ArraySink, use PUT_RESULT, and finally call
MessageEnd(). Upon receiving MessageEnd(), the filter will put the result
of the authentication in the ArraySink. Something like:
GCM< AES >::Decryption decrypter;
decrypter.SetKeyWithIV( key, sizeof(key), iv, sizeof(iv) );
...
bool result = false;
AuthenticatedDecryptionFilter df( decrypter,
new ArraySink(&result, sizeof(result)),
PUT_MESSAGE | MAC_AT_END );
if(result == false)
throw "Authentication failed";
General reading is available at
http://www.cryptopp.com/wiki/Authenticated_Encryption and
http://www.cryptopp.com/wiki/AuthenticatedEncryptionFilter. If you know the
mode you want to use, then there's more detailed write ups at
http://www.cryptopp.com/wiki/Eax, http://www.cryptopp.com/wiki/Ccm, and
http://www.cryptopp.com/wiki/Gcm.
Jeff
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