On Tuesday, July 16, 2013 4:54:06 PM UTC-4, Jeffrey Walton wrote:
>
>
>
> 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 );
>
Part of that was incorrect. If you PUT_RESULT, then it muddies the waters
with PUT_MESSAGE.
After inserting all data into the filter, call MessageEnd() to get it
processed and then call:
bool verified = df.GetLastResult();
assert(verified == true);
Jeff
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