From 94cb1a4dbe2e28aaaf36cd741800cf5c1b16e08f Mon Sep 17 00:00:00 2001
From: Andrew Kozlik <andrew.kozlik@gmail.com>
Date: Thu, 14 Feb 2019 16:52:35 +0100
Subject: [PATCH] Before checking the PIN sleep for 2^ctr - 1 seconds instead
 of 2^(ctr-1) seconds.

---
 storage.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/storage.c b/storage.c
index 16ebe6597f..2611f7cf7c 100644
--- a/storage.c
+++ b/storage.c
@@ -744,8 +744,8 @@ secbool storage_unlock(uint32_t pin)
         return secfalse;
     }
 
-    // Sleep for 2^(ctr-1) seconds before checking the PIN.
-    uint32_t wait = (1 << ctr) >> 1;
+    // Sleep for 2^ctr - 1 seconds before checking the PIN.
+    uint32_t wait = (1 << ctr) - 1;
     uint32_t progress;
     for (uint32_t rem = wait; rem > 0; rem--) {
         for (int i = 0; i < 10; i++) {