dess.cpp

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//
// gettsc.inl
//
// gives access to the Pentium's (secret) cycle counter
//
// This software was written by Leonard Janke ([email protected])
// in 1996-7 and is entered, by him, into the public domain.

#if defined(__WATCOMC__)
void GetTSC(unsigned long&);
#pragma aux GetTSC = 0x0f 0x31 "mov [edi], eax" parm [edi] modify [edx eax];
#elif defined(__GNUC__)
inline
void GetTSC(unsigned long& tsc)
{
  asm volatile(".byte 15, 49\n\t"
           : "=eax" (tsc)
           :
           : "%edx", "%eax");
}
#elif defined(_MSC_VER)
inline
void GetTSC(unsigned long& tsc)
{
  unsigned long a;
  __asm _emit 0fh
  __asm _emit 31h
  __asm mov a, eax;
  tsc=a;
}
#endif      

#include <stdio.h>
#include <stdlib.h>
#include <openssl/des.h>

void main(int argc,char *argv[])
    {
    des_key_schedule key;
    unsigned long s1,s2,e1,e2;
    unsigned long data[2];
    int i,j;

    for (j=0; j<6; j++)
        {
        for (i=0; i<1000; i++) 
            {
            des_encrypt(&data[0],key,1);
            GetTSC(s1);
            des_encrypt(&data[0],key,1);
            des_encrypt(&data[0],key,1);
            des_encrypt(&data[0],key,1);
            GetTSC(e1);
            GetTSC(s2);
            des_encrypt(&data[0],key,1);
            des_encrypt(&data[0],key,1);
            des_encrypt(&data[0],key,1);
            des_encrypt(&data[0],key,1);
            GetTSC(e2);
            des_encrypt(&data[0],key,1);
            }

        printf("des %d %d (%d)\n",
            e1-s1,e2-s2,((e2-s2)-(e1-s1)));
        }
    }