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__)
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/rc4.h>
36 
37 void 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