sha1s.cpp

Go to the documentation of this file.

//
// 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/sha.h>

extern "C" {
void sha1_block_x86(SHA_CTX *ctx, unsigned char *buffer,int num);
}

void main(int argc,char *argv[])
    {
    unsigned char buffer[64*256];
    SHA_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++) 
            {
            sha1_block_x86(&ctx,buffer,numm);
            GetTSC(s1);
            sha1_block_x86(&ctx,buffer,numm);
            GetTSC(e1);
            GetTSC(s2);
            sha1_block_x86(&ctx,buffer,num);
            GetTSC(e2);
            sha1_block_x86(&ctx,buffer,num);
            }

        printf("sha1 (%d bytes) %d %d (%.2f)\n",num,
            e1-s1,e2-s2,(double)((e1-s1)-(e2-s2))/2);
        }
    }