1//
2// gettsc.inl
3//
4// gives access to the Pentium's (secret) cycle counter
5//
6// This software was written by Leonard Janke (janke@unixg.ubc.ca)
7// in 1996-7 and is entered, by him, into the public domain.
8
9#if defined(__WATCOMC__)
10void GetTSC(unsigned long&);
11#pragma aux GetTSC = 0x0f 0x31 "mov [edi], eax" parm [edi] modify [edx eax];
12#elif defined(__GNUC__)
13inline
14void 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)
22inline
23void 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/rc4.h>
36
37void main(int argc,char *argv[])
38	{
39	unsigned char buffer[1024];
40	RC4_KEY ctx;
41	unsigned long s1,s2,e1,e2;
42	unsigned char k[16];
43	unsigned long data[2];
44	unsigned char iv[8];
45	int i,num=64,numm;
46	int j=0;
47
48	if (argc >= 2)
49		num=atoi(argv[1]);
50
51	if (num == 0) num=256;
52	if (num > 1024-16) num=1024-16;
53	numm=num+8;
54
55	for (j=0; j<6; j++)
56		{
57		for (i=0; i<10; i++) /**/
58			{
59			RC4(&ctx,numm,buffer,buffer);
60			GetTSC(s1);
61			RC4(&ctx,numm,buffer,buffer);
62			GetTSC(e1);
63			GetTSC(s2);
64			RC4(&ctx,num,buffer,buffer);
65			GetTSC(e2);
66			RC4(&ctx,num,buffer,buffer);
67			}
68
69		printf("RC4 (%d bytes) %d %d (%d) - 8 bytes\n",num,
70			e1-s1,e2-s2,(e1-s1)-(e2-s2));
71		}
72	}
73
74