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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2022 WireGuard LLC. All Rights Reserved.
*/
package tai64n
import (
"testing"
"time"
)
// Test that timestamps are monotonic as required by Wireguard and that
// nanosecond-level information is whitened to prevent side channel attacks.
func TestMonotonic(t *testing.T) {
startTime := time.Unix(0, 123456789) // a nontrivial bit pattern
// Whitening should reduce timestamp granularity
// to more than 10 but fewer than 20 milliseconds.
tests := []struct {
name string
t1, t2 time.Time
wantAfter bool
}{
{"after_10_ns", startTime, startTime.Add(10 * time.Nanosecond), false},
{"after_10_us", startTime, startTime.Add(10 * time.Microsecond), false},
{"after_1_ms", startTime, startTime.Add(time.Millisecond), false},
{"after_10_ms", startTime, startTime.Add(10 * time.Millisecond), false},
{"after_20_ms", startTime, startTime.Add(20 * time.Millisecond), true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
ts1, ts2 := stamp(tt.t1), stamp(tt.t2)
got := ts2.After(ts1)
if got != tt.wantAfter {
t.Errorf("after = %v; want %v", got, tt.wantAfter)
}
})
}
}
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