Sorry..deleted that just before your reply appeared. On further consideration I also realized that although I just got some code to work, I shouldn't assume it's a non-issue till the cross-validation you discussed was done. But apologies in advanve if this is a non-issue.
So first, my original post, followed by new code that appears to work: Threefish-1024 IV specification issue/doumentaion...or bug? There appears to be a problem setting the longer IV required for threefish-1024. My code (modified from code on the wiki) works for -256 but nothing I've tried works for -1024. The problem might be in documentation of something specific to threefish-1024, though it might be related to threefish.h: 41: CRYPTOPP_CONSTANT(IV_LENGTH=32) which is described as NOT_RESYNCHRONIZABLE [though I don't know whether this is in the sense pertaining to IV length] and is not varied for different cases as the keylength is nearby. But the benchmark suggests there's a way around this if it's not misreporting. Crypto++ 6.0.0 Benchmarks Threefish/CTR (1024-bit key) 61 25.2 0.918 1469 Here's what I get with similar code for threefish-256 and threefish-1024: $ ./threefish256try IV_LENGTH: 32 Algorithm: Threefish/CTR Maximum Key Size: 128 bytes Plain Text (12 bytes) 'Hello World.' Recovered Text: 'Hello World.' $ ./threefish1024try IV_LENGTH: 128 terminate called after throwing an instance of 'CryptoPP::InvalidArgument' what(): Threefish/CTR: IV length 32 is less than the minimum of 128 Aborted (core dumped) ============================== code for 1024: // threefish1024try.cpp //based on // https://web.archive.org/web/20150315102342/http://www.cryptopp.com/fom-serve/cache/79.html //2006-Jan-21 11:08am jason entry // g++ -g3 -O2 -Wall -Wextra threefish1024try.cpp -o threefish1024try -I/usr/local/include/cryptopp -L/usr/local/lib -lcryptopp #include <iostream> //#include <iomanip> // Crypto++ Includes #include "cryptlib.h" #include "modes.h" // xxx_Mode< > #include "filters.h" // StringSource and #include "threefish.h" #define CIPHER_MODE CTR_Mode #define CIPHER Threefish #define BLOCKSIZE 128 #define IV_LENGTH 128 // using namespace CryptoPP; int main(int argc, char* argv[]) { std::cout << "IV_LENGTH: " << IV_LENGTH << std::endl; CryptoPP::byte key[ CryptoPP::CIPHER::MAX_KEYLENGTH ], iv[ IV_LENGTH ]; ::memset( key, 0x01, CryptoPP::CIPHER::MAX_KEYLENGTH ); ::memset( iv, 0x01, IV_LENGTH ); // Message M std::string PlainText = "Hello World."; // Cipher Text Sink std::string CipherText; // Encryptor CryptoPP::CTR_Mode<CryptoPP::Threefish >::Encryption Encryptor( key, CryptoPP::CIPHER::MAX_KEYLENGTH, iv ); // Encryption CryptoPP::StringSource( PlainText, true, new CryptoPP::StreamTransformationFilter( Encryptor, new CryptoPP::StringSink( CipherText ) ) // StreamTransformationFilter ); // StringSource /////////////////////////////////////// // DMZ // /////////////////////////////////////// // Recovered Text Sink std::string RecoveredText; // Decryptor CryptoPP::CIPHER_MODE<CryptoPP::CIPHER >::Decryption Decryptor( key, CryptoPP::CIPHER::MAX_KEYLENGTH, iv ); // Decryption CryptoPP::StringSource( CipherText, true, new CryptoPP::StreamTransformationFilter( Decryptor, new CryptoPP::StringSink( RecoveredText ) ) // StreamTransformationFilter ); // StringSource ////////////////////////////////////////// // Output // ////////////////////////////////////////// std::cout << "Algorithm:" << std::endl; std::cout << " " << Encryptor.AlgorithmName() << std::endl; std::cout << "Maximum Key Size:" << std::endl; std::cout << " " << Encryptor.MaxKeyLength() << " bytes" << std::endl; std::cout << std::endl; std::cout << "Plain Text (" << PlainText.length() << " bytes)" << std::endl; std::cout << " '" << PlainText << "'" << std::endl; std::cout << std::endl; std::cout << "Recovered Text:" << std::endl; std::cout << " '" << RecoveredText << "'" << std::endl; std::cout << std::endl; return 0; } ============================== ============================== Result for new code: $ ./threefish1024try2IV_LENGTH: 128 Algorithm: Threefish/CTR Maximum Key Size: 128 bytes Plain Text (12 bytes) 'Hello World.' Recovered Text: 'Hello World.' ============================== new code: // threefish1024try2.cpp //based on // https://web.archive.org/web/20150315102342/http://www.cryptopp.com/fom-serve/cache/79.html //2006-Jan-21 11:08am jason entry // g++ -g3 -O2 -Wall -Wextra threefish1024try2.cpp -o threefish1024try2 -I/usr/local/include/cryptopp -L/usr/local/lib -lcryptopp #include <iostream> //#include <iomanip> // Crypto++ Includes #include "cryptlib.h" #include "modes.h" // xxx_Mode< > #include "filters.h" // StringSource and #include "threefish.h" #define CIPHER_MODE CTR_Mode #define CIPHER Threefish #define BLOCKSIZE 128 #define KEY_LENGTH 128 #define IV_LENGTH 128 // using namespace CryptoPP; int main(int argc, char* argv[]) { std::cout << "IV_LENGTH: " << IV_LENGTH << std::endl; CryptoPP::byte key[ CryptoPP::CIPHER::MAX_KEYLENGTH ], iv[ IV_LENGTH ]; ::memset( key, 0x01, CryptoPP::CIPHER::MAX_KEYLENGTH ); ::memset( iv, 0x01, IV_LENGTH ); // Message M std::string PlainText = "Hello World."; // Cipher Text Sink std::string CipherText; // Encryptor CryptoPP::CTR_Mode<CryptoPP::Threefish >::Encryption Encryptor; //( key, CryptoPP::CIPHER::MAX_KEYLENGTH, iv, IV_LENGTH ); Encryptor.SetKeyWithIV(key, KEY_LENGTH, iv, IV_LENGTH); // Encryptor.SetKeyWithIV(key, key.size(), iv, iv.size()); // Encryption CryptoPP::StringSource( PlainText, true, new CryptoPP::StreamTransformationFilter( Encryptor, new CryptoPP::StringSink( CipherText ) ) // StreamTransformationFilter ); // StringSource /////////////////////////////////////// // DMZ // /////////////////////////////////////// // Recovered Text Sink std::string RecoveredText; // Decryptor CryptoPP::CIPHER_MODE<CryptoPP::CIPHER >::Decryption Decryptor;//( key, CryptoPP::CIPHER::MAX_KEYLENGTH, iv, IV_LENGTH ); Decryptor.SetKeyWithIV(key, KEY_LENGTH, iv, IV_LENGTH); // Decryption CryptoPP::StringSource( CipherText, true, new CryptoPP::StreamTransformationFilter( Decryptor, new CryptoPP::StringSink( RecoveredText ) ) // StreamTransformationFilter ); // StringSource ////////////////////////////////////////// // Output // ////////////////////////////////////////// std::cout << "Algorithm:" << std::endl; std::cout << " " << Encryptor.AlgorithmName() << std::endl; std::cout << "Maximum Key Size:" << std::endl; std::cout << " " << Encryptor.MaxKeyLength() << " bytes" << std::endl; std::cout << std::endl; std::cout << "Plain Text (" << PlainText.length() << " bytes)" << std::endl; std::cout << " '" << PlainText << "'" << std::endl; std::cout << std::endl; std::cout << "Recovered Text:" << std::endl; std::cout << " '" << RecoveredText << "'" << std::endl; std::cout << std::endl; return 0; } -- -- You received this message because you are subscribed to the "Crypto++ Users" Google Group. 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