snapshot of https://github.com/grpc/grpc-go.git (master, 2026-09-15; blobs > 131072B omitted)

credentials/alts/internal/conn/counter_test.go

@@ -0,0 +1,141 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package conn
+
+import (
+	"bytes"
+	"testing"
+
+	core "google.golang.org/grpc/credentials/alts/internal"
+)
+
+const (
+	testOverflowLen = 5
+)
+
+func (s) TestCounterSides(t *testing.T) {
+	for _, side := range []core.Side{core.ClientSide, core.ServerSide} {
+		outCounter := NewOutCounter(side, testOverflowLen)
+		inCounter := NewInCounter(side, testOverflowLen)
+		for i := 0; i < 1024; i++ {
+			value, _ := outCounter.Value()
+			if g, w := CounterSide(value), side; g != w {
+				t.Errorf("after %d iterations, CounterSide(outCounter.Value()) = %v, want %v", i, g, w)
+				break
+			}
+			value, _ = inCounter.Value()
+			if g, w := CounterSide(value), side; g == w {
+				t.Errorf("after %d iterations, CounterSide(inCounter.Value()) = %v, want %v", i, g, w)
+				break
+			}
+			outCounter.Inc()
+			inCounter.Inc()
+		}
+	}
+}
+
+func (s) TestCounterInc(t *testing.T) {
+	for _, test := range []struct {
+		counter []byte
+		want    []byte
+	}{
+		{
+			counter: []byte{0x00, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+			want:    []byte{0x01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+		},
+		{
+			counter: []byte{0x00, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x80},
+			want:    []byte{0x01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x80},
+		},
+		{
+			counter: []byte{0xff, 0x00, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+			want:    []byte{0x00, 0x01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+		},
+		{
+			counter: []byte{0x42, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+			want:    []byte{0x43, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+		},
+		{
+			counter: []byte{0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
+			want:    []byte{0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
+		},
+		{
+			counter: []byte{0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80},
+			want:    []byte{0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80},
+		},
+	} {
+		c := CounterFromValue(test.counter, overflowLenAES128GCM)
+		c.Inc()
+		value, _ := c.Value()
+		if g, w := value, test.want; !bytes.Equal(g, w) || c.invalid {
+			t.Errorf("counter(%v).Inc() =\n%v, want\n%v", test.counter, g, w)
+		}
+	}
+}
+
+func (s) TestRolloverCounter(t *testing.T) {
+	for _, test := range []struct {
+		desc        string
+		value       []byte
+		overflowLen int
+	}{
+		{
+			desc:        "testing overflow without rekeying 1",
+			value:       []byte{0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80},
+			overflowLen: 5,
+		},
+		{
+			desc:        "testing overflow without rekeying 2",
+			value:       []byte{0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
+			overflowLen: 5,
+		},
+		{
+			desc:        "testing overflow for rekeying mode 1",
+			value:       []byte{0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x80},
+			overflowLen: 8,
+		},
+		{
+			desc:        "testing overflow for rekeying mode 2",
+			value:       []byte{0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00},
+			overflowLen: 8,
+		},
+	} {
+		c := CounterFromValue(test.value, overflowLenAES128GCM)
+
+		// First Inc() + Value() should work.
+		c.Inc()
+		_, err := c.Value()
+		if err != nil {
+			t.Errorf("%v: first Inc() + Value() unexpectedly failed: %v, want <nil> error", test.desc, err)
+		}
+		// Second Inc() + Value() should fail.
+		c.Inc()
+		_, err = c.Value()
+		if err != errInvalidCounter {
+			t.Errorf("%v: second Inc() + Value() unexpectedly succeeded: want %v", test.desc, errInvalidCounter)
+		}
+		// Third Inc() + Value() should also fail because the counter is
+		// already in an invalid state.
+		c.Inc()
+		_, err = c.Value()
+		if err != errInvalidCounter {
+			t.Errorf("%v: Third Inc() + Value() unexpectedly succeeded: want %v", test.desc, errInvalidCounter)
+		}
+	}
+}