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authorDenis Vlasenko2006-12-12 14:38:03 +0000
committerDenis Vlasenko2006-12-12 14:38:03 +0000
commit900406c359c319100c892a38be2bb5d76a8f85b9 (patch)
treeb0b691558f415197eeb587b848f18dff05b46897 /loginutils/passwd.c
parent6f0540e7eca61fa10344699d023f4a90f705601d (diff)
downloadbusybox-900406c359c319100c892a38be2bb5d76a8f85b9.zip
busybox-900406c359c319100c892a38be2bb5d76a8f85b9.tar.gz
passwd: shrink by ~10 bytes, use PRNG instead of usleep.
Diffstat (limited to 'loginutils/passwd.c')
-rw-r--r--loginutils/passwd.c27
1 files changed, 10 insertions, 17 deletions
diff --git a/loginutils/passwd.c b/loginutils/passwd.c
index 1f48829..a062596 100644
--- a/loginutils/passwd.c
+++ b/loginutils/passwd.c
@@ -5,7 +5,6 @@
#include "busybox.h"
#include <syslog.h>
-#include <sys/times.h> /* times() */
static void nuke_str(char *str)
@@ -16,7 +15,8 @@ static void nuke_str(char *str)
static int i64c(int i)
{
- if (i <= 0)
+ i &= 0x3f;
+ if (i == 0)
return '.';
if (i == 1)
return '/';
@@ -30,23 +30,16 @@ static int i64c(int i)
static void crypt_make_salt(char *p, int cnt)
{
-#if !defined(__GLIBC__)
- struct tms t;
-#define TIMES times(&t)
-#else
-/* glibc allows for times(NULL) a-la time() */
-#define TIMES times(NULL)
-#endif
- unsigned long x = x; /* it's pointless to initialize it anyway :) */
+ unsigned x = x; /* it's pointless to initialize it anyway :) */
- x += getpid();
+ x += getpid() + time(NULL) + clock();
do {
- /* clock() and times() variability is different between systems */
- /* hopefully at least one is good enough */
- x += time(NULL) + clock() + TIMES;
- *p++ = i64c(((x >> 18) ^ (x >> 6)) & 0x3f);
- *p++ = i64c(((x >> 12) ^ x) & 0x3f);
- usleep(100); /* or else time() etc won't change */
+ /* x = (x*1664525 + 1013904223) mod 2^32 generator is lame
+ * (low-order bit is not "random", etc...),
+ * but for our purposes it is good enough */
+ x = x*1664525 + 1013904223;
+ *p++ = i64c(x >> 16);
+ *p++ = i64c(x >> 22);
} while (--cnt);
*p = '\0';
}