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tai64n: whiten nano seconds

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Avoid being too precise of a time oracle.
This commit is contained in:
Jason A. Donenfeld 2019-02-03 02:08:16 +01:00
parent 2b7562abbb
commit a5ca02d79a
1 changed files with 3 additions and 2 deletions
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5
tai64n/tai64n.go
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@ -12,7 +12,8 @@ import (
) )
const TimestampSize = 12 const TimestampSize = 12
const base = uint64(4611686018427387914) const base = uint64(0x400000000000000a)
const whitenerMask = uint32(0x1000000 - 1)
type Timestamp [TimestampSize]byte type Timestamp [TimestampSize]byte
@ -20,7 +21,7 @@ func Now() Timestamp {
var tai64n Timestamp var tai64n Timestamp
now := time.Now() now := time.Now()
secs := base + uint64(now.Unix()) secs := base + uint64(now.Unix())
nano := uint32(now.Nanosecond()) nano := uint32(now.Nanosecond()) &^ whitenerMask
binary.BigEndian.PutUint64(tai64n[:], secs) binary.BigEndian.PutUint64(tai64n[:], secs)
binary.BigEndian.PutUint32(tai64n[8:], nano) binary.BigEndian.PutUint32(tai64n[8:], nano)
return tai64n return tai64n