I suspect the inclusion of just the sha2 file from CryptoPP was the fix. Although I've never benchmarked them, my suspicion is the CryptoPP code outperformed Op

I suspect the inclusion of just the sha2 file from CryptoPP was the fix. Although I've never benchmarked them, my suspicion is the CryptoPP code outperformed OpenSSL at the time. Having the most optimal implementation would have been critical.