#include "os.h"#include <libsec.h> /* * timing safe memcmp() */inttsmemcmp(void *a1, void *a2, ulong n){ int lt, gt, c1, c2, r, m; uchar *s1, *s2; r = m = 0; s1 = a1; s2 = a2; while(n--){ c1 = *s1++; c2 = *s2++; lt = (c1 - c2) >> 8; gt = (c2 - c1) >> 8; r |= (lt - gt) & ~m; m |= lt | gt; } return r;}
#include "os.h"
#include <libsec.h>
/*
* timing safe memcmp()
*/
int
tsmemcmp(void *a1, void *a2, ulong n)
{
int lt, gt, c1, c2, r, m;
uchar *s1, *s2;
r = m = 0;
s1 = a1;
s2 = a2;
while(n--){
c1 = *s1++;
c2 = *s2++;
lt = (c1 - c2) >> 8;
gt = (c2 - c1) >> 8;
r |= (lt - gt) & ~m;
m |= lt | gt;
}
return r;
}