c++ - How to loop over Blowfish Crypto++ -
i running crypto++ doing speed tests on encryption algorithms. trying time how long takes encrypt, decrypt data(eventually more file sizes , different algorithms). running problem cannot loop on code. in following code, using blowfish, when encryption part, gives me error:
hashverificationfilter: message hash or mac not valid what can fix this? need put in function? if so, how that?
/** * g++ encryption_tests.cpp -o encryption_tests -lcryptopp -lpthread -l. */ #include <iostream> #include <string> #include <iomanip> #include <fstream> #include <ctime> #include "cryptoplusplus/osrng.h" using cryptopp::autoseededrandompool; #include "cryptoplusplus/cryptlib.h" using cryptopp::exception; #include "cryptoplusplus/hex.h" using cryptopp::hexencoder; using cryptopp::hexdecoder; #include "cryptoplusplus/modes.h" #include "cryptoplusplus/aes.h" #include "cryptoplusplus/filters.h" using cryptopp::stringsink; using cryptopp::stringsource; using cryptopp::authenticatedencryptionfilter; using cryptopp::authenticateddecryptionfilter; using namespace std; #include "cryptoplusplus/filters.h" using cryptopp::stringsink; using cryptopp::stringsource; using cryptopp::authenticatedencryptionfilter; using cryptopp::authenticateddecryptionfilter; #include "cryptoplusplus/blowfish.h" using cryptopp::blowfish; #include "crypto++/eax.h" using cryptopp::eax; #include "cryptoplusplus/secblock.h" using cryptopp::secbyteblock; int main( int argc, char* argv[] ) { // declaring variables const int number_of_runs = 3; const int number_of_txt_files = 9; const int number_of_jpg_files = 6; const int number_of_png_files = 6; const int number_of_avi_files = 2; string file_names_txt[number_of_txt_files] = { "10b.txt", "100b.txt", "1kb.txt", "10kb.txt", "100kb.txt", "1mb.txt", "5mb.txt", "10mb.txt", "20mb.txt" }; string file_names_jpg[number_of_jpg_files] = { "1kb.jpg", "10kb.jpg", "100kb.jpg", "1mb.jpg", "3mb.jpg", "5mb.jpg" }; string file_names_png[number_of_png_files] = { "100b.png", "500b.png","1kb.png", "10kb.png","1mb.png", "5mb.png" }; string file_names_avi[number_of_avi_files] = { "4mb.avi", "10mb.avi" }; int time_data [number_of_runs]; string plaintext, cipher, encoded, recovered, sample_files_path, data_file, line_contents; string initial_cpp_time_data = ""; clock_t time_start, time_stop; double run_time, time_difference, time_average = 0; // loop run test number_of_runs times ( int = 0 ; < number_of_runs ; i++ ) { time_start = clock(); // class seeds using operating system provided rng autoseededrandompool prng; // generate random key secbyteblock key(blowfish::default_keylength); prng.generateblock(key, key.size()); // generate random initialization vector byte iv[blowfish::blocksize]; prng.generateblock(iv, sizeof(iv)); // set key width eax< blowfish >::encryption e; e.setkeywithiv(key, key.size(), iv); // grab data file want run test on sample_files_path = "sample_files/" + file_names_txt[8]; ifstream initial_file_contents ( sample_files_path.c_str() ); if (initial_file_contents.is_open()) { while ( getline( initial_file_contents, line_contents ) ) { plaintext = plaintext + line_contents; plaintext.push_back('\n'); initial_file_contents.close(); } } else { cout << "unable open file" << endl; } // encrypts plaintext try { stringsource(plaintext, true, new authenticatedencryptionfilter(e, new stringsink(cipher) ) ); } catch ( const cryptopp::exception& e ) { cerr << e.what() << endl; exit(1); } // decrypts test try { eax< blowfish >::decryption d; d.setkeywithiv(key, key.size(), iv); stringsource s(cipher, true, new authenticateddecryptionfilter( d, new stringsink(recovered) ) ); } catch ( const cryptopp::exception& e ) { cerr << e.what() << endl; exit(1); } // stop clock, calculate time difference, turn milliseconds time_stop = clock(); time_difference = time_stop - time_start; run_time = time_difference / ( clocks_per_sec / 1000 ); time_data[i] = run_time; cout << "time_data[" << << "]: " << time_data[i] << " milliseconds" << endl; } //grab data old file ifstream initial_cpp_time_data_file ( "cpp_time_data.txt" ); if (initial_cpp_time_data_file.is_open()) { while ( getline( initial_cpp_time_data_file, line_contents ) ) { initial_cpp_time_data = initial_cpp_time_data + line_contents; initial_cpp_time_data.push_back('\n'); } initial_cpp_time_data_file.close(); } else { initial_cpp_time_data = ""; } // created new file ofstream time_data_file; time_data_file.open("cpp_time_data.txt"); // insert old data first time_data_file << initial_cpp_time_data << endl; // show file test ran on , insert new data time_data_file << sample_files_path << endl; ( int = 0 ; < number_of_runs ; i++ ) { time_data_file << "time_data[" << << "]: " << time_data[i] << " milliseconds" << endl; time_average = time_average + time_data[i]; } time_average = time_average / number_of_runs; time_data_file << "the average time " << time_average << " milliseconds" << endl; cout << "the average time " << time_average << " milliseconds" << endl; time_data_file.close(); cout << "done!\n"; return 0; }
at each iteration of loop, have call:
cipher.clear()recovered.clear()
otherwise, stringsink's keep adding end of previous value. fail on 2nd , subsequent iterations of loop (the 1st should ok).
also, there no resynchronize, can't call e.resynchronize(iv) restart cipher. have call e.setkeywithiv(key, key.size(), iv) @ each iteration of loop.
below, not duplicate reuse problem. encryption object reused, while decryption object created new each iteration. result of running program:
$ ./cryptopp-test.exe plain text: string 1 recovered text: string 1 plain text: string 2 recovered text: string 2 plain text: string 3 recovered text: string 3 plain text: string 4 recovered text: string 4 plain text: string 5 recovered text: string 5 autoseededrandompool prng; secbyteblock key(blowfish::default_keylength); prng.generateblock( key, key.size() ); byte iv[ blowfish::blocksize ]; prng.generateblock( iv, sizeof(iv) ); vector<string> vv; vv.push_back("string 1"); vv.push_back("string 2"); vv.push_back("string 3"); vv.push_back("string 4"); vv.push_back("string 5"); string plain, cipher, recovered; try { eax< blowfish >::encryption e1; e1.setkeywithiv( key, key.size(), iv, sizeof(iv) ); for(unsigned = 0; < vv.size(); i++) { /*********************************\ \*********************************/ plain = vv[i]; cout << "plain text: " << plain << endl; e1.setkeywithiv( key, key.size(), iv, sizeof(iv) ); cipher.clear(); stringsource ss1(plain, true, new authenticatedencryptionfilter( e1, new stringsink( cipher ) ) ); // stringsource /*********************************\ \*********************************/ eax< blowfish >::decryption d2; d2.setkeywithiv( key, key.size(), iv, sizeof(iv) ); recovered.clear(); stringsource ss2(cipher, true, new authenticateddecryptionfilter( d2, new stringsink( recovered ), authenticateddecryptionfilter::throw_exception ) ); // stringsource cout << "recovered text: " << recovered << endl; } } catch (const exception& ex) { cerr << ex.what() << endl; } 
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