Add measurement reader (#1381)

Signed-off-by: Daniel Weiße <dw@edgeless.systems>

measurement-reader/internal/tpm/tpm_test.go

@@ -0,0 +1,78 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package tpm
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/edgelesssys/constellation/v2/internal/attestation/measurements"
+	"github.com/edgelesssys/constellation/v2/measurement-reader/internal/sorted"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSortMeasurements(t *testing.T) {
+	testCases := map[string]struct {
+		input measurements.M
+		want  []sorted.Measurement
+	}{
+		"pre sorted": {
+			input: measurements.M{
+				0: measurements.WithAllBytes(0x11, false),
+				1: measurements.WithAllBytes(0x22, false),
+				2: measurements.WithAllBytes(0x33, false),
+			},
+			want: []sorted.Measurement{
+				{
+					Index: "PCR[00]",
+					Value: bytes.Repeat([]byte{0x11}, 32),
+				},
+				{
+					Index: "PCR[01]",
+					Value: bytes.Repeat([]byte{0x22}, 32),
+				},
+				{
+					Index: "PCR[02]",
+					Value: bytes.Repeat([]byte{0x33}, 32),
+				},
+			},
+		},
+		"unsorted": {
+			input: measurements.M{
+				1: measurements.WithAllBytes(0x22, false),
+				0: measurements.WithAllBytes(0x11, false),
+				2: measurements.WithAllBytes(0x33, false),
+			},
+			want: []sorted.Measurement{
+				{
+					Index: "PCR[00]",
+					Value: bytes.Repeat([]byte{0x11}, 32),
+				},
+				{
+					Index: "PCR[01]",
+					Value: bytes.Repeat([]byte{0x22}, 32),
+				},
+				{
+					Index: "PCR[02]",
+					Value: bytes.Repeat([]byte{0x33}, 32),
+				},
+			},
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			assert := assert.New(t)
+
+			got := sortMeasurements(tc.input)
+			for i := range got {
+				assert.Equal(got[i].Index, tc.want[i].Index)
+				assert.Equal(got[i].Value, tc.want[i].Value)
+			}
+		})
+	}
+}