Question

我正在通过AES-128和AES-256进行性能测试。但我的结果大约是20％。我使用的是Intel Core 2 Duo 800 MHz。 2.60 GHz。 6 MB高速缓存T9500 CPU和Linux Mint 17.2 Rosa Xfce Os。我的测试有问题吗？任何帮助将不胜感激。

我的测试代码在这里：标题;

// g++ -g3 -ggdb -O0 -DDEBUG -I/usr/include/cryptopp AESCBC128.cpp -o AESCBC128.exe -lcryptopp -lpthread
// g++ -g -O2 -DNDEBUG -I/usr/include/cryptopp AESCBC128.cpp -o AESCBC128.exe -lcryptopp -lpthread
  #include "osrng.h"
   using CryptoPP::AutoSeededRandomPool;
   #include <iostream>
   using std::cout;
   using std::cerr;
   using std::endl;
   #include <string>
   using std::string;
   #include <cstdlib>
   using std::exit;
   #include "cryptlib.h"
   using CryptoPP::Exception;
   #include "hex.h"
   using CryptoPP::HexEncoder;
   using CryptoPP::HexDecoder;
   #include "filters.h"
   using CryptoPP::StringSink;
   using CryptoPP::StringSource;
   using CryptoPP::StreamTransformationFilter;
   #include "aes.h"
   using CryptoPP::AES;
   #include "ccm.h"
   using CryptoPP::CBC_Mode;
   #include "assert.h"
   #include<sstream>
   const double CLOCK_TICKS_PER_SECOND = 1000000.0;

我的代码（针对AES-256）;

 int main(int argc, char* argv[]){
 AutoSeededRandomPool prng;

 byte key[AES::MAX_KEYLENGTH];
 prng.GenerateBlock(key, sizeof(key));

 byte iv[AES::BLOCKSIZE];
 prng.GenerateBlock(iv, sizeof(iv));

 CBC_Mode< AES >::Encryption e;
 e.SetKeyWithIV(key, sizeof(key), iv);

我的代码（针对AES-128）;

 int main(int argc, char* argv[]){
 AutoSeededRandomPool prng;

 byte key[AES::DEFAULT_KEYLENGTH];
 prng.GenerateBlock(key, sizeof(key));

 byte iv[AES::BLOCKSIZE];
 prng.GenerateBlock(iv, sizeof(iv));

 CBC_Mode< AES >::Encryption e;
 e.SetKeyWithIV(key, sizeof(key), iv);

我使用crypto ++测试数据rijndael.dat作为plianText（1020字节）。就像;

std::string plain = "000102030405060708090A0B0C0D....

我的测试代码;

clock_t startTime, finishTime;      
std::string plain, cipher, encoded, recovered;   
startTime = clock();  
for ( int i = 0; i < 200000; i++ )
{
    // clean up for next round
    cipher = "";

try
{

// The StreamTransformationFilter removes
//  padding as required.
StringSource s(plain, true, 
    new StreamTransformationFilter(e,
        new StringSink(cipher)
    ) // StreamTransformationFilter
); // StringSource
 }
  catch(const CryptoPP::Exception& e)
   {
      cerr << e.what() << endl;
      exit(1);
    }  
 } // end-for  
  // save current time just after finishing the encryption loop
   finishTime = clock();

我保持结果;

 double executionTimeInSec = double( finishTime - startTime ) / CLOCK_TICKS_PER_SECOND;    

 std::cout << "Encryption loop execution time: " << executionTimeInSec * 1000.0 << " microseconds." << std::endl;

 std::cout << "Plain text size: " << plain.size() << " bytes." << std::endl;

 double data_rate_MiBps = ((double)plain.size() / 1048576) / ((double)executionTimeInSec) ;

 std::cout << "Encryption/decryption loop execution time MB/S: " << data_rate_MiBps << " MB/S." << std::endl; 
  return 0;
 }

最后我的结果在这里;

AES-128/CBC ----------
           2037.41 encryption loop execution time (microseconds)
           0.083 microseconds for Key Setup and IV
           95.48 Encrypiton loop execution time (MIB/Seconds)
AES-256/CBC ----------
           2470.86 encryption loop execution time (microseconds)
           0.092 microseconds for Key Setup and IV
           78.72 Encrypiton loop execution time (MIB/Seconds)

为什么AES-128的性能不比AES-256好40％

0 个答案: