github.com/liloew/wireguard-go@v0.0.0-20220224014633-9cd745e6f114/tai64n/tai64n_test.go (about)

     1  /* SPDX-License-Identifier: MIT
     2   *
     3   * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
     4   */
     5  
     6  package tai64n
     7  
     8  import (
     9  	"testing"
    10  	"time"
    11  )
    12  
    13  // Test that timestamps are monotonic as required by Wireguard and that
    14  // nanosecond-level information is whitened to prevent side channel attacks.
    15  func TestMonotonic(t *testing.T) {
    16  	startTime := time.Unix(0, 123456789) // a nontrivial bit pattern
    17  	// Whitening should reduce timestamp granularity
    18  	// to more than 10 but fewer than 20 milliseconds.
    19  	tests := []struct {
    20  		name      string
    21  		t1, t2    time.Time
    22  		wantAfter bool
    23  	}{
    24  		{"after_10_ns", startTime, startTime.Add(10 * time.Nanosecond), false},
    25  		{"after_10_us", startTime, startTime.Add(10 * time.Microsecond), false},
    26  		{"after_1_ms", startTime, startTime.Add(time.Millisecond), false},
    27  		{"after_10_ms", startTime, startTime.Add(10 * time.Millisecond), false},
    28  		{"after_20_ms", startTime, startTime.Add(20 * time.Millisecond), true},
    29  	}
    30  
    31  	for _, tt := range tests {
    32  		t.Run(tt.name, func(t *testing.T) {
    33  			ts1, ts2 := stamp(tt.t1), stamp(tt.t2)
    34  			got := ts2.After(ts1)
    35  			if got != tt.wantAfter {
    36  				t.Errorf("after = %v; want %v", got, tt.wantAfter)
    37  			}
    38  		})
    39  	}
    40  }