From: Sergey Matveev <stargrave@stargrave.org>
Date: Wed, 20 Nov 2024 21:25:26 +0000 (+0300)
Subject: Assure that minimally encoded TAI64s are used
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=cbb6f2752501bdccbf143ceda135519b902dd1a2112f1a3c0fb791004be423d2;p=keks.git

Assure that minimally encoded TAI64s are used
---

diff --git a/pyac/pyac.py b/pyac/pyac.py
index 43dcf8b..92f0ec4 100755
--- a/pyac/pyac.py
+++ b/pyac/pyac.py
@@ -298,11 +298,15 @@ def loads(v, sets=False, leapsecUTCAllow=False):
         nsecs = 0
         if l > 8:
             nsecs = int.from_bytes(v[1+8:1+8+4], "big")
+            if nsecs == 0:
+                raise DecodeError("non-minimal encoding")
             if nsecs > 999999999:
                 raise DecodeError("too many nanoseconds")
         asecs = 0
         if l > 12:
             asecs = int.from_bytes(v[1+8+4:1+8+4+4], "big")
+            if asecs == 0:
+                raise DecodeError("non-minimal encoding")
             if asecs > 999999999:
                 raise DecodeError("too many attoseconds")
         secs = tai2utc(secs - TAI64Base, leapsecUTCAllow)