On Thu, May 11, 2023 at 4:24 PM Dwight Kulkarni <dwi...@realtime-7.com> wrote:
>
> I created a 5 MB message and encrypted it. The message takes 3 seconds to
> encrypt. I needed something around 200 ms, even if the encryption is weaker.
>
> My code is below, should I be setting any flags when compiling the library to
> make it fast ?
>
> Got message str at: 05/11/2023 20:21:31.346
> in encrypt aes
> Encrypted at: 05/11/2023 20:21:33.027
>
> message_bytes = encrypt_aes(message_bytes, key, iv);
> cout << " Encrypted at: " << get_curr_datetime_str() << endl;
>
>
> std::string encrypt_aes(std::string message, SecByteBlock key, SecByteBlock
> iv) {
> try {
> cout <<" in encrypt aes " <<endl;
> AlgorithmParameters params = MakeParameters(Name::FeedbackSize(), 1/*8-bits*/)
> (Name::IV(), ConstByteArrayParameter(iv));
> CFB_Mode<AES>::Encryption e;
> std::string cipher;
> e.SetKey(key, key.size(), params);
> StringSource ss(message, true, new StreamTransformationFilter(e, new
> StringSink(cipher)));
> cout << " returning cipher " << endl;
> return cipher;
> }
> catch (CryptoPP::Exception e) {
> std::cerr << e.what() << std::endl;
> return "";
> }
> }
You should probably avoid multiple resizes on cipher object. Add something like:
std::string cipher;
cipher.reserve(message.size()+16);
Otherwise, please run the benchmarks and report back:
cryptest.exe b2 3 <cpufreq in GHz>
Also see https://cryptopp.com/wiki/Benchmarks .
Jeff
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