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dess.cpp
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1 //
2 // gettsc.inl
3 //
4 // gives access to the Pentium's (secret) cycle counter
5 //
6 // This software was written by Leonard Janke ([email protected])
7 // in 1996-7 and is entered, by him, into the public domain.
8 
9 #if defined(__WATCOMC__)
10 void GetTSC(unsigned long&);
11 #pragma aux GetTSC = 0x0f 0x31 "mov [edi], eax" parm [edi] modify [edx eax];
12 #elif defined(__GNUC__)
13 inline
14 void GetTSC(unsigned long& tsc)
15 {
16  asm volatile(".byte 15, 49\n\t"
17  : "=eax" (tsc)
18  :
19  : "%edx", "%eax");
20 }
21 #elif defined(_MSC_VER)
22 inline
23 void GetTSC(unsigned long& tsc)
24 {
25  unsigned long a;
26  __asm _emit 0fh
27  __asm _emit 31h
28  __asm mov a, eax;
29  tsc=a;
30 }
31 #endif
32 
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <openssl/des.h>
36 
37 void main(int argc,char *argv[])
38  {
40  unsigned long s1,s2,e1,e2;
41  unsigned long data[2];
42  int i,j;
43 
44  for (j=0; j<6; j++)
45  {
46  for (i=0; i<1000; i++)
47  {
48  des_encrypt(&data[0],key,1);
49  GetTSC(s1);
50  des_encrypt(&data[0],key,1);
51  des_encrypt(&data[0],key,1);
52  des_encrypt(&data[0],key,1);
53  GetTSC(e1);
54  GetTSC(s2);
55  des_encrypt(&data[0],key,1);
56  des_encrypt(&data[0],key,1);
57  des_encrypt(&data[0],key,1);
58  des_encrypt(&data[0],key,1);
59  GetTSC(e2);
60  des_encrypt(&data[0],key,1);
61  }
62 
63  printf("des %d %d (%d)\n",
64  e1-s1,e2-s2,((e2-s2)-(e1-s1)));
65  }
66  }
67