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On Thu, Oct 12, 2023, 10:55 PM Dwight Kulkarni <dwi...@realtime-7.com>
wrote:
> Hello,
>
> I had Crypto PP code that was previously working and recently stopped
> working. We moved to a new version of our BSP.
>
> Error is:
> terminate called after throwing an instance of
> 'CryptoPP::AlgorithmParametersBase::ParameterNotUsed'
> what(): AlgorithmParametersBase: parameter "IV" not used
>
> Error is traced to this particular function below.
>
> I had it running with the Params in ECB mode still passing in the IV.
> d.SetKey(key, key.size(),params);
>
> Then I commented it out with:
> d.SetKey(key, key.size());
>
> Previously, it wasn't throwing an error even if IV is passed in ECB mode.
>
> Also, I don't know why it's falling through the catch statement and kills
> my program.
>
> should I have a generic catch statement Exception e to prevent this ?
>
> std::string decrypt_aes(std::string cipherbytes, SecByteBlock key,
> SecByteBlock iv) {
> try {
> AlgorithmParameters params = MakeParameters(Name::FeedbackSize(), 1
> /*8-bits*/)
> (Name::IV(), ConstByteArrayParameter(iv));
> //CFB_Mode<AES>::Decryption d;
> ECB_Mode<AES>::Decryption d;
> std::string recovered;
> //d.SetKey(key, key.size(),params);
> d.SetKey(key, key.size());
> StringSource s(cipherbytes, true, new StreamTransformationFilter(d, new
> StringSink(recovered), CryptoPP::BlockPaddingSchemeDef::PKCS_PADDING));
> return recovered;
> }
> catch (CryptoPP::Exception e) {
> std::cerr << e.what() << std::endl;
> return "";
> }
> }
>
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