This is the simplest version I could think of. This may not be optimal
and may not use the full power of Crypto++ (maybe Jeffrey knows more).
BR
JPM
Code:
// returns the hash, reads from In and forwards In to Out
SecByteBlock sha1stream(std::fstream<byte>& In, std::fstream<byte>& Out) // out
may be optional for you
{
byte buffer; // do it byte-by-byte
CryptoPP::Weak::SHA1 Instance; // you must omit the "Weak" if you're
using <=5.6.2
while(In.get(buffer)) // returns true if successful and false otherwise
{
Instance.Update(buffer,1); //process
Out.write(buffer,1); // pass to next "consumer"
}
buffer=0; //clean buffer up
FixedSizeSecBlock<byte,20> Output; // we know the size in advance
Instance.Final(Output);
return Output;
}
Am 16.10.2015 um 14:10 schrieb Goran:
> Hi all,
>
> I'm using Crypto++ the first time and wondering how I can get the
> sha1sum of a simple std::fstream?
>
> Thanks
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