A local copy of OpenSSL from GitHub
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//
// gettsc.inl
//
// gives access to the Pentium's (secret) cycle counter
//
// This software was written by Leonard Janke (janke@unixg.ubc.ca)
// 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/md4.h>
extern "C" {
void md4_block_x86(MD4_CTX *ctx, unsigned char *buffer,int num);
}
void main(int argc,char *argv[])
{
unsigned char buffer[64*256];
MD4_CTX ctx;
unsigned long s1,s2,e1,e2;
unsigned char k[16];
unsigned long data[2];
unsigned char iv[8];
int i,num=0,numm;
int j=0;
if (argc >= 2)
num=atoi(argv[1]);
if (num == 0) num=16;
if (num > 250) num=16;
numm=num+2;
num*=64;
numm*=64;
for (j=0; j<6; j++)
{
for (i=0; i<10; i++) /**/
{
md4_block_x86(&ctx,buffer,numm);
GetTSC(s1);
md4_block_x86(&ctx,buffer,numm);
GetTSC(e1);
GetTSC(s2);
md4_block_x86(&ctx,buffer,num);
GetTSC(e2);
md4_block_x86(&ctx,buffer,num);
}
printf("md4 (%d bytes) %d %d (%.2f)\n",num,
e1-s1,e2-s2,(double)((e1-s1)-(e2-s2))/2);
}
}