1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
#include <valgrind/memcheck.h>
/* return zero for all inputs */
static unsigned char z(unsigned char x) {
unsigned long long z = (unsigned long long) x + 1ULL;
unsigned long long t = z;
long long i;
for (i = 6; i >= 0; --i) {
t = (t * t) % 257;
t = (t * z) % 257;
}
t = (t * z) % 257;
return (unsigned char) t - 1;
}
static void secret(void *xv, long long xlen) {
VALGRIND_MAKE_MEM_UNDEFINED(xv, xlen);
}
static void public(void *xv, long long xlen) {
VALGRIND_MAKE_MEM_DEFINED(xv, xlen);
}
int main(int argc, char **argv) {
unsigned char buf[32] = {1};
unsigned char ret = 0;
unsigned long long i;
(void) argc;
(void) argv;
secret(buf, sizeof buf);
for (i = 0; i < sizeof buf; ++i) ret |= z(buf[i]);
public(buf, sizeof buf);
for (i = 0; i < sizeof buf; ++i) ret |= z(buf[i]);
return ret;
}
|
