From 34eca9c51215485c70492d6edea3513ada1c8895 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Tue, 7 Apr 2020 14:12:29 +0530
Subject: always round timestamps before signature creation/verification

---
 src/util/time.ts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'src/util/time.ts')

diff --git a/src/util/time.ts b/src/util/time.ts
index ea4f8ca8d..f296aba12 100644
--- a/src/util/time.ts
+++ b/src/util/time.ts
@@ -49,6 +49,7 @@ export function getTimestampNow(): Timestamp {
 export function getDurationRemaining(
   deadline: Timestamp,
   now = getTimestampNow(),
+
 ): Duration {
   if (deadline.t_ms === "never") {
     return { d_ms: "forever" };
@@ -72,6 +73,19 @@ export function timestampMin(t1: Timestamp, t2: Timestamp): Timestamp {
   return { t_ms: Math.min(t1.t_ms, t2.t_ms) };
 }
 
+/**
+ * Truncate a timestamp so that that it represents a multiple
+ * of seconds.  The timestamp is always rounded down.
+ */
+export function timestampTruncateToSecond(t1: Timestamp): Timestamp {
+  if (t1.t_ms === "never") {
+    return { t_ms: "never" };
+  }
+  return {
+    t_ms: Math.floor(t1.t_ms / 1000) * 1000,
+  };
+}
+
 export function durationMin(d1: Duration, d2: Duration): Duration {
   if (d1.d_ms === "forever") {
     return { d_ms: d2.d_ms };
-- 
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