41 lines
1.2 KiB
Go
41 lines
1.2 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
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*/
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package tai64n
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import (
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"testing"
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"time"
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)
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// Test that timestamps are monotonic as required by Wireguard and that
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// nanosecond-level information is whitened to prevent side channel attacks.
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func TestMonotonic(t *testing.T) {
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startTime := time.Unix(0, 123456789) // a nontrivial bit pattern
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// Whitening should reduce timestamp granularity
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// to more than 10 but fewer than 20 milliseconds.
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tests := []struct {
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name string
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t1, t2 time.Time
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wantAfter bool
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}{
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{"after_10_ns", startTime, startTime.Add(10 * time.Nanosecond), false},
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{"after_10_us", startTime, startTime.Add(10 * time.Microsecond), false},
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{"after_1_ms", startTime, startTime.Add(time.Millisecond), false},
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{"after_10_ms", startTime, startTime.Add(10 * time.Millisecond), false},
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{"after_20_ms", startTime, startTime.Add(20 * time.Millisecond), true},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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ts1, ts2 := stamp(tt.t1), stamp(tt.t2)
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got := ts2.After(ts1)
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if got != tt.wantAfter {
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t.Errorf("after = %v; want %v", got, tt.wantAfter)
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}
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})
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}
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}
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