#include <cryptopp/cryptlib.h>#include <cryptopp/osrng.h>#include <cryptopp/secblock.h>#include <cryptopp/sha.h>#include <cryptopp/sha3.h>#include <cryptopp/base64.h>#include <cryptopp/filters.h>#include <cryptopp/gcm.h>#include <cryptopp/rsa.h>#include <cryptopp/pssr.h> int main() {    {        CryptoPP::SHA512 sha2;        unsigned char digest[CryptoPP::SHA512::DIGESTSIZE];        sha2.Final(digest);    }     {        std::string data;        const CryptoPP::SecByteBlock key;        const CryptoPP::SecByteBlock iv;         CryptoPP::SecByteBlock ret(0, CryptoPP::AES::MAX_KEYLENGTH);        CryptoPP::StringSource(data, true, new CryptoPP::HashFilter(*(new CryptoPP::SHA3_512), new CryptoPP::ArraySink(ret, CryptoPP::AES::MAX_KEYLENGTH)));        CryptoPP::GCM< CryptoPP::AES, CryptoPP::GCM_64K_Tables >::Encryption pwenc;        pwenc.SetKeyWithIV(key.data(), key.size(), iv.data(), iv.size());        std::string cipher;        CryptoPP::StringSource(data, true, new CryptoPP::AuthenticatedEncryptionFilter(pwenc, new CryptoPP::StringSink(cipher), false, 16));    }     {        const CryptoPP::SecByteBlock key;        const CryptoPP::SecByteBlock iv;        CryptoPP::GCM< CryptoPP::AES, CryptoPP::GCM_64K_Tables >::Decryption pwdec;        pwdec.SetKeyWithIV(key.data(), key.size(), iv.data(), iv.size());    }     {        CryptoPP::SecByteBlock ret(0, CryptoPP::AES::BLOCKSIZE);        std::string str;        CryptoPP::StringSource(str, true, new CryptoPP::Base64Decoder(new CryptoPP::ArraySink(ret, CryptoPP::AES::BLOCKSIZE)));    }     return 0;}