Thank you for your reply. I do know about the manual and have used it a lot. What I want to confirm with the code is that I am using the manual and the library correctly.
Best, Trung God loved the birds and invented trees. Man loved the birds and invented cages. ~Jacques Deval Probability does not exist. ~Bruno de Finetti Brian: "Look, you've got it all wrong! You don't NEED to follow ME, You don't NEED to follow ANYBODY! You've got to think for your selves! You're ALL individuals!" ~Monty Python, "The Life of Brian" On Sun, Apr 15, 2018 at 2:27 AM, <hanluluge...@gmail.com> wrote: > You can download the Crypto++ 's manual from this link: > https://www.cryptopp.com/docs/ref/CryptoPPRef.zip. > > 在 2018年4月15日星期日 UTC+8上午11:13:31，Trung B. Pham写道： > >> Hi, >> >> I am very new to this library and trying to use it for a personal project. >> Can someone please review the below code for correctness? >> >> Let's call this program xyz. >> So, >> g++ main.cpp -O3 -o xyz -lcryptopp >> >> Encrypt file using Threefish1024/CTR and PBKDF2 >> ./xyz -p password -s salt -i filename > filename.enc >> Decrypt file using Threefish1024/CTR and PBKDF2 >> ./xyz -p password -s salt -i filename.enc > filename.enc.dec >> Derive key using PBKDF2: >> ./xyz -h password -s salt >> >> >> >> #include <assert.h> >> #include <string.h> >> >> >> #include <fstream> >> #include <iostream> >> #include <string> >> #include <iterator> >> >> >> #include <cryptopp/modes.h> >> #include <cryptopp/pwdbased.h> >> #include <cryptopp/sha3.h> >> #include <cryptopp/threefish.h> >> #include <cryptopp/hex.h> >> >> >> #define KEY_LENGTH 128U >> #define CTR_LENGTH 128U >> #define TWEAK_LENGTH 16U >> >> // Read all file into std::vector<char> >> static std::vector<char> read_file(char const *filename) { >> std::ifstream ifs(filename, std::ios::binary | std::ios::ate); >> std::ifstream::pos_type pos = ifs.tellg(); >> >> std::vector<char> result(pos); >> >> >> ifs.seekg(0, std::ios::beg); >> ifs.read(result.data(), pos); >> >> >> return result; >> } >> >> >> int main(int argc, char *argv[]) { >> >> // Encrypt and decrypt file using Threefish1024/CTR and PBKDF2 >> // Require password, salt, and filename >> // Output: stdout >> if (argc == 7 && strcmp(argv[1], "-p") == 0 && strcmp(argv[3], "-s") >> == 0 && strcmp(argv[5], "-i") == 0) { >> >> size_t pwd_len = strlen(argv[2]); >> size_t salt_len = strlen(argv[4]); >> assert(pwd_len >= 10); >> assert(salt_len >= 10); >> >> >> try { >> size_t buf_len = KEY_LENGTH + CTR_LENGTH + TWEAK_LENGTH; >> CryptoPP::byte buf[buf_len]; >> CryptoPP::PKCS5_PBKDF2_HMAC<CryptoPP::SHA3_512> pbkdf2; >> pbkdf2.DeriveKey(buf, buf_len, 0, (CryptoPP::byte *)argv[2], >> pwd_len, (CryptoPP::byte *)argv[4], salt_len, 42); >> >> std::vector<char> plain_text = read_file(argv[6]); >> >> // I am very unsure about ConstByteArrayParameter and >> SetTweak >> // Please advise >> CryptoPP::ConstByteArrayParameter tweak(&buf[KEY_LENGTH + >> CTR_LENGTH], TWEAK_LENGTH, false); >> CryptoPP::AlgorithmParameters params = CryptoPP:: >> MakeParameters(CryptoPP::Name::Tweak(), tweak); >> CryptoPP::Threefish1024::Encryption t3f(buf, KEY_LENGTH); >> t3f.SetTweak(params); >> CryptoPP::CTR_Mode_ExternalCipher::Encryption encryptor(t3f, >> &buf[KEY_LENGTH]); >> encryptor.ProcessData((CryptoPP::byte *)plain_text.data(), ( >> CryptoPP::byte *)plain_text.data(), plain_text.size()); >> std::copy(plain_text.begin(), plain_text.end(), std:: >> ostream_iterator<char>(std::cout, "")); >> } catch (CryptoPP::Exception const& ex) { >> std::cout << "CryptoPP::Exception caught: " << ex.what() << >> std::endl; >> exit(-1); >> } catch (std::exception const& ex) { >> std::cout << "std::exception caught: " << ex.what() << std:: >> endl; >> exit(-1); >> } >> >> // Derive key using PBKDF2 >> // Require password and salt >> // Output: stdout >> } else if (argc == 5 && strcmp(argv[1], "-h") == 0 && strcmp(argv[3], >> "-s") == 0) { >> >> size_t pwd_len = strlen(argv[2]); >> size_t salt_len = strlen(argv[4]); >> assert(pwd_len >= 10); >> assert(salt_len >= 10); >> >> try { >> size_t buf_len = 64; >> CryptoPP::byte buf[buf_len]; >> CryptoPP::PKCS5_PBKDF2_HMAC<CryptoPP::SHA3_512> pbkdf2; >> pbkdf2.DeriveKey(buf, buf_len, 0, (CryptoPP::byte *)argv[2], >> pwd_len, (CryptoPP::byte *)argv[4], salt_len, 42); >> >> std::string encoded; >> CryptoPP::StringSource(buf, buf_len, true, new CryptoPP:: >> HexEncoder(new CryptoPP::StringSink(encoded), false)); >> std::cout << encoded; >> } catch (CryptoPP::Exception const& ex) { >> std::cout << "CryptoPP::Exception caught: " << ex.what() << >> std::endl; >> exit(-1); >> } catch (std::exception const& ex) { >> std::cout << "std::exception caught: " << ex.what() << std:: >> endl; >> exit(-1); >> } >> >> } else { >> printf("Wrong argv\n"); >> exit(-1); >> } >> >> >> return EXIT_SUCCESS; >> } >> >> >> >> -- > You received this message because you are subscribed to "Crypto++ Users". > More information about Crypto++ and this group is available at > http://www.cryptopp.com and http://groups.google.com/ > forum/#!forum/cryptopp-users. > --- > You received this message because you are subscribed to the Google Groups > "Crypto++ Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to cryptopp-users+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to "Crypto++ Users". 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