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authorJason A. Donenfeld <Jason@zx2c4.com>2019-02-03 02:08:16 +0100
committerJason A. Donenfeld <Jason@zx2c4.com>2019-02-05 12:59:42 +0100
commita5ca02d79a953c883694061bba5c683b220fbfe4 (patch)
tree0c5b0af257d0d0e7bc3af9a406e55684e22529aa /tai64n
parentuapi: Simpler function signature (diff)
downloadwireguard-go-a5ca02d79a953c883694061bba5c683b220fbfe4.tar.xz
wireguard-go-a5ca02d79a953c883694061bba5c683b220fbfe4.zip
tai64n: whiten nano seconds
Avoid being too precise of a time oracle.
Diffstat (limited to 'tai64n')
-rw-r--r--tai64n/tai64n.go5
1 files changed, 3 insertions, 2 deletions
diff --git a/tai64n/tai64n.go b/tai64n/tai64n.go
index f402f05..565aaa4 100644
--- a/tai64n/tai64n.go
+++ b/tai64n/tai64n.go
@@ -12,7 +12,8 @@ import (
)
const TimestampSize = 12
-const base = uint64(4611686018427387914)
+const base = uint64(0x400000000000000a)
+const whitenerMask = uint32(0x1000000 - 1)
type Timestamp [TimestampSize]byte
@@ -20,7 +21,7 @@ func Now() Timestamp {
var tai64n Timestamp
now := time.Now()
secs := base + uint64(now.Unix())
- nano := uint32(now.Nanosecond())
+ nano := uint32(now.Nanosecond()) &^ whitenerMask
binary.BigEndian.PutUint64(tai64n[:], secs)
binary.BigEndian.PutUint32(tai64n[8:], nano)
return tai64n