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seal_test.go
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seal_test.go
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package tpmwrap
import (
"bytes"
"context"
"encoding/json"
"testing"
"github.com/google/go-tpm-tools/simulator"
"github.com/google/go-tpm/legacy/tpm2"
"github.com/google/go-tpm/tpmutil"
wrapping "github.com/hashicorp/go-kms-wrapping/v2"
"github.com/stretchr/testify/require"
"google.golang.org/protobuf/encoding/protojson"
)
func TestSeal(t *testing.T) {
tpmDevice, err := simulator.Get()
require.NoError(t, err)
defer tpmDevice.Close()
ctx := context.Background()
wrapper := NewWrapper()
_, err = wrapper.SetConfig(ctx, WithTPM(tpmDevice))
require.NoError(t, err)
dataToSeal := []byte("foo")
blobInfo, err := wrapper.Encrypt(ctx, dataToSeal)
require.NoError(t, err)
b, err := protojson.Marshal(blobInfo)
require.NoError(t, err)
var prettyJSON bytes.Buffer
err = json.Indent(&prettyJSON, b, "", "\t")
require.NoError(t, err)
newBlobInfo := &wrapping.BlobInfo{}
err = protojson.Unmarshal(b, newBlobInfo)
require.NoError(t, err)
plaintext, err := wrapper.Decrypt(ctx, newBlobInfo)
require.NoError(t, err)
require.Equal(t, dataToSeal, plaintext)
}
func TestSealPCR(t *testing.T) {
tpmDevice, err := simulator.Get()
require.NoError(t, err)
defer tpmDevice.Close()
ctx := context.Background()
wrapper := NewWrapper()
_, err = wrapper.SetConfig(ctx, WithTPM(tpmDevice), WithPCRS("23"))
require.NoError(t, err)
dataToSeal := []byte("foo")
blobInfo, err := wrapper.Encrypt(ctx, dataToSeal)
require.NoError(t, err)
b, err := protojson.Marshal(blobInfo)
require.NoError(t, err)
var prettyJSON bytes.Buffer
err = json.Indent(&prettyJSON, b, "", "\t")
require.NoError(t, err)
newBlobInfo := &wrapping.BlobInfo{}
err = protojson.Unmarshal(b, newBlobInfo)
require.NoError(t, err)
plaintext, err := wrapper.Decrypt(ctx, newBlobInfo)
require.NoError(t, err)
require.Equal(t, dataToSeal, plaintext)
}
func TestSealPCRFail(t *testing.T) {
tpmDevice, err := simulator.Get()
require.NoError(t, err)
defer tpmDevice.Close()
ctx := context.Background()
wrapper := NewWrapper()
_, err = wrapper.SetConfig(ctx, WithTPM(tpmDevice), WithPCRS("23"))
require.NoError(t, err)
dataToSeal := []byte("foo")
blobInfo, err := wrapper.Encrypt(ctx, dataToSeal)
require.NoError(t, err)
b, err := protojson.Marshal(blobInfo)
require.NoError(t, err)
var prettyJSON bytes.Buffer
err = json.Indent(&prettyJSON, b, "", "\t")
require.NoError(t, err)
newBlobInfo := &wrapping.BlobInfo{}
err = protojson.Unmarshal(b, newBlobInfo)
require.NoError(t, err)
pcr := 23
pcrval, err := tpm2.ReadPCR(tpmDevice, pcr, tpm2.AlgSHA256)
require.NoError(t, err)
pcrToExtend := tpmutil.Handle(pcr)
err = tpm2.PCRExtend(tpmDevice, pcrToExtend, tpm2.AlgSHA256, pcrval, "")
require.NoError(t, err)
_, err = wrapper.Decrypt(ctx, newBlobInfo)
require.Error(t, err)
}