dial the time back to about 0.1s, closer to the original targets and

friendlier for users. requested by deraadt

src/lib/libc/crypt/bcrypt.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: bcrypt.c,v 1.51 2015/01/12 03:20:04 tedu Exp $	*/
+/*	$OpenBSD: bcrypt.c,v 1.52 2015/01/28 23:33:52 tedu Exp $	*/
 
 /*
  * Copyright (c) 2014 Ted Unangst <tedu@openbsd.org>
@@ -235,7 +235,7 @@ bcrypt_checkpass(const char *pass, const char *goodhash)
 
 /*
  * Measure this system's performance by measuring the time for 8 rounds.
- * We are aiming for something that takes between 0.25 and 0.5 seconds.
+ * We are aiming for something that takes around 0.1s, but not too much over.
  */
 int
 bcrypt_autorounds(void)
@@ -254,12 +254,12 @@ bcrypt_autorounds(void)
 	duration += (after.tv_nsec - before.tv_nsec) / 1000;
 
 	/* too quick? slow it down. */
-	while (r < 16 && duration <= 1000000 / 4) {
+	while (r < 16 && duration <= 60000) {
 		r += 1;
 		duration *= 2;
 	}
 	/* too slow? speed it up. */
-	while (r > 4 && duration > 1000000 / 2) {
+	while (r > 4 && duration > 120000) {
 		r -= 1;
 		duration /= 2;
 	}