Anomalous behavior with Encrypted HMAC
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Anomalous behavior with Encrypted HMAC
by Dillon Beresford
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Wei/Jeff/All, Good morning. I have been experimenting with a function that I threw together after an idea I came up with for reducing the size of my HMAC result. The objective was to reduce the size of the SHA512 HMAC and provide an extra layer of security by encrypting the initial HMAC StrinkSink() result. I've noticed some strange behavior after testing the function. It appears that my HMAC CIPHER produces duplicate results intermittently. Around one and ten yields duplicate results. Thanks, Dillon Beresford - ---snip void rsaesecsha::HMACtoRSA(const char *hexKey, const char* iFile) { CryptoPP::member_ptr<CryptoPP::MessageAuthenticationCode> mac; std::string decodedKey; CryptoPP::StringSource(hexKey, true, new CryptoPP::HexDecoder( new CryptoPP::StringSink(decodedKey))); mac.reset(new CryptoPP::HMAC<CryptoPP::SHA512>(( const byte *)decodedKey.data(), decodedKey.size())); std::cout << "HMAC KEY: "; CryptoPP::FileSource(iFile, true, new CryptoPP::HashFilter(*mac, new CryptoPP::HexEncoder( new CryptoPP::FileSink(cout)))); std::cout << std::endl << std::endl; std::cout << "HMAC CIPHER: "; std::string outStr; CryptoPP::DefaultEncryptorWithMAC encrypt(hexKey, new CryptoPP::HexEncoder( new CryptoPP::StringSink(outStr))); encrypt.Put((byte *)hexKey, strlen(hexKey)); encrypt.MessageEnd(); std::cout << outStr << std::endl; } Results from my last test... HMAC KEY: BB84150047202212F696E7BCC13549CA01318D32AAD2845E2B67DE03C6C4ADCA3E9A4261C5742A936718ECA174B87F866709ADF971C70C080D27A31888435A13 HMAC CIPHER: 27F354E712A3797BF691C4E97959A1A0BA53FCF9C32A5446FB86731898EA1FEDF2B8E7B240A9B5522D685F1A0548E81CCE60156815701AA6 - ------------ HMAC KEY: BB84150047202212F696E7BCC13549CA01318D32AAD2845E2B67DE03C6C4ADCA3E9A4261C5742A936718ECA174B87F866709ADF971C70C080D27A31888435A13 HMAC CIPHER: 27F354E712A3797BF691C4E97959A1A0BA53FCF9C32A5446FB86731898EA1FEDF2B8E7B240A9B5522D685F1A0548E81CCE60156815701AA6 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkqKoLwACgkQRnxC5lZRuuEsGQCgi0AU32JTwmNokkdAUsZnB1HK //UAnRxuOmgLSTEci3VRuEgtSc49t1SL =rmrR -----END PGP SIGNATURE----- --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the "Crypto++ Users" Google Group. To unsubscribe, send an email to cryptopp-users-unsubscribe@.... More information about Crypto++ and this group is available at http://www.cryptopp.com. -~----------~----~----~----~------~----~------~--~--- |
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Re: Anomalous behavior with Encrypted HMAC
by Dillon Beresford
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On a side note ignore the name in the class, This function is not intended to use RSA. I'm playing around with that as well. On Aug 18, 7:38 am, Dillon Beresford <dillon.beresf...@...> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi Wei/Jeff/All, > > Good morning. I have been experimenting with a function that I threw > together after an idea I came up with for reducing the size of my > HMAC result. > > The objective was to reduce the size of the SHA512 HMAC and provide an > extra layer of security by encrypting the initial HMAC StrinkSink() > result. I've noticed some strange behavior after testing the function. > > It appears that my HMAC CIPHER produces duplicate results > intermittently. Around one and ten yields duplicate results. > > Thanks, > > Dillon Beresford > > - ---snip > > void rsaesecsha::HMACtoRSA(const char *hexKey, const char* iFile) > { > > CryptoPP::member_ptr<CryptoPP::MessageAuthenticationCode> mac; > > std::string decodedKey; > > CryptoPP::StringSource(hexKey, true, > new CryptoPP::HexDecoder( > new CryptoPP::StringSink(decodedKey))); > > mac.reset(new CryptoPP::HMAC<CryptoPP::SHA512>(( > const byte *)decodedKey.data(), decodedKey.size())); > > std::cout << "HMAC KEY: "; > > CryptoPP::FileSource(iFile, true, > new CryptoPP::HashFilter(*mac, > new CryptoPP::HexEncoder( > new CryptoPP::FileSink(cout)))); > > std::cout << std::endl << std::endl; > std::cout << "HMAC CIPHER: "; > > std::string outStr; > > CryptoPP::DefaultEncryptorWithMAC encrypt(hexKey, > new CryptoPP::HexEncoder( > new CryptoPP::StringSink(outStr))); > > encrypt.Put((byte *)hexKey, strlen(hexKey)); > encrypt.MessageEnd(); > > std::cout << outStr << std::endl; > > } > > Results from my last test... > > HMAC KEY: > BB84150047202212F696E7BCC13549CA01318D32AAD2845E2B67DE03C6C4ADCA3E9A4261C5742A936718ECA174B87F866709ADF971C70C080D27A31888435A13 > > HMAC CIPHER: > 27F354E712A3797BF691C4E97959A1A0BA53FCF9C32A5446FB86731898EA1FEDF2B8E7B240A9B5522D685F1A0548E81CCE60156815701AA6 > > - ------------ > > HMAC KEY: > BB84150047202212F696E7BCC13549CA01318D32AAD2845E2B67DE03C6C4ADCA3E9A4261C5742A936718ECA174B87F866709ADF971C70C080D27A31888435A13 > > HMAC CIPHER: > 27F354E712A3797BF691C4E97959A1A0BA53FCF9C32A5446FB86731898EA1FEDF2B8E7B240A9B5522D685F1A0548E81CCE60156815701AA6 > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (GNU/Linux) > Comment: Using GnuPG with Mozilla -http://enigmail.mozdev.org/ > > iEYEARECAAYFAkqKoLwACgkQRnxC5lZRuuEsGQCgi0AU32JTwmNokkdAUsZnB1HK > //UAnRxuOmgLSTEci3VRuEgtSc49t1SL > =rmrR > -----END PGP SIGNATURE----- You received this message because you are subscribed to the "Crypto++ Users" Google Group. To unsubscribe, send an email to cryptopp-users-unsubscribe@.... More information about Crypto++ and this group is available at http://www.cryptopp.com. -~----------~----~----~----~------~----~------~--~--- |
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