mirror of
https://github.com/google/go-attestation.git
synced 2024-12-19 04:57:59 +00:00
232 lines
5.8 KiB
Go
232 lines
5.8 KiB
Go
// Copyright 2019 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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package attest
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import (
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"bytes"
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"crypto"
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"crypto/rsa"
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"testing"
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"github.com/google/certificate-transparency-go/x509"
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"github.com/google/go-tpm/tpm2/credactivation"
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"github.com/google/go-tpm/tpm2"
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"github.com/google/go-tpm-tools/simulator"
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)
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func setupSimulatedTPM(t *testing.T) (*simulator.Simulator, *TPM) {
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t.Helper()
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tpm, err := simulator.Get()
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if err != nil {
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t.Fatal(err)
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}
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return tpm, &TPM{
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version: TPMVersion20,
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interf: TPMInterfaceKernelManaged,
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sysPath: "/dev/tpmrm0",
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rwc: tpm,
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}
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}
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func TestEK(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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eks, err := tpm.EKs()
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if err != nil {
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t.Errorf("EKs() failed: %v", err)
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}
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if len(eks) == 0 || (eks[0].Cert == nil && eks[0].Public == nil) {
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t.Errorf("EKs() = %v, want at least 1 EK with populated fields", eks)
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}
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}
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func TestInfo(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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info, err := tpm.Info()
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if err != nil {
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t.Errorf("tpm.Info() failed: %v", err)
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}
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// We dont expect anything to be meaningfully populated as this is a simulator.
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t.Logf("TPM Info = %+v", info)
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}
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func TestAIKCreateAndLoad(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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aik, err := tpm.MintAIK(nil)
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if err != nil {
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t.Fatalf("MintAIK() failed: %v", err)
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}
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enc, err := aik.Marshal()
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if err != nil {
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aik.Close(tpm)
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t.Fatalf("aik.Marshal() failed: %v", err)
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}
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if err := aik.Close(tpm); err != nil {
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t.Fatalf("aik.Close() failed: %v", err)
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}
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loaded, err := tpm.LoadKey(enc)
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if err != nil {
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t.Fatalf("LoadKey() failed: %v", err)
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}
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defer loaded.Close(tpm)
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if !bytes.Equal(loaded.Public, aik.Public) {
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t.Error("Original & loaded AIK public blobs did not match.")
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t.Logf("Original = %v", aik.Public)
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t.Logf("Loaded = %v", loaded.Public)
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}
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}
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// chooseEK selects the EK public which will be activated against.
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func chooseEK(t *testing.T, eks []PlatformEK) crypto.PublicKey {
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t.Helper()
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for _, ek := range eks {
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if ek.Cert != nil && ek.Cert.PublicKeyAlgorithm == x509.RSA {
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return ek.Cert.PublicKey.(*rsa.PublicKey)
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} else if ek.Public != nil {
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return ek.Public
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}
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}
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t.Skip("No suitable RSA EK found")
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return nil
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}
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func TestActivateCredentialTPM20(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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aik, err := tpm.MintAIK(nil)
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if err != nil {
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t.Fatalf("MintAIK() failed: %v", err)
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}
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defer aik.Close(tpm)
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EKs, err := tpm.EKs()
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if err != nil {
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t.Fatalf("EKs() failed: %v", err)
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}
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ek := chooseEK(t, EKs)
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att, err := tpm2.DecodeAttestationData(aik.CreateAttestation)
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if err != nil {
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t.Fatalf("tpm2.DecodeAttestationData() failed: %v", err)
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}
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secret := []byte{1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8}
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id, encSecret, err := credactivation.Generate(att.AttestedCreationInfo.Name.Digest, ek, 16, secret)
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if err != nil {
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t.Fatalf("credactivation.Generate() failed: %v", err)
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}
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decryptedSecret, err := aik.ActivateCredential(tpm, EncryptedCredential{
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Credential: id,
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Secret: encSecret,
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})
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if err != nil {
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t.Errorf("aik.ActivateCredential() failed: %v", err)
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}
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if !bytes.Equal(secret, decryptedSecret) {
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t.Error("secret does not match decrypted secret")
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t.Logf("Secret = %v", secret)
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t.Logf("Decrypted secret = %v", decryptedSecret)
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}
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}
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func TestQuoteTPM20(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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aik, err := tpm.MintAIK(nil)
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if err != nil {
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t.Fatalf("MintAIK() failed: %v", err)
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}
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defer aik.Close(tpm)
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nonce := []byte{1, 2, 3, 4, 5, 6, 7, 8}
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quote, err := aik.Quote(tpm, nonce, tpm2.AlgSHA256)
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if err != nil {
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t.Fatalf("aik.Quote() failed: %v", err)
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}
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// TODO(jsonp): Parse quote structure once gotpm/tpm2 supports it.
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if quote == nil {
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t.Error("quote was nil, want *Quote")
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}
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}
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func TestPCRsTPM20(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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PCRs, alg, err := tpm.PCRs()
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if err != nil {
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t.Fatalf("PCRs() failed: %v", err)
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}
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if len(PCRs) != 24 {
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t.Errorf("len(PCRs) = %d, want %d", len(PCRs), 24)
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}
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if got, want := tpm2.AlgSHA256, alg; got != want {
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t.Errorf("alg = %v, want %v", got, want)
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}
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for i, pcr := range PCRs {
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if len(pcr.Digest) != pcr.DigestAlg.Size() {
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t.Errorf("PCR %d len(digest) = %d, expected match with digest algorithm size (%d)", pcr.Index, len(pcr.Digest), pcr.DigestAlg.Size())
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}
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if pcr.Index != i {
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t.Errorf("PCR index %d does not match map index %d", pcr.Index, i)
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}
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if pcr.DigestAlg != crypto.SHA256 {
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t.Errorf("pcr.DigestAlg = %v, expected crypto.SHA256", pcr.DigestAlg)
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}
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}
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}
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func TestPersistence(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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ekHnd, p, err := tpm.getPrimaryKeyHandle(commonEkEquivalentHandle)
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if err != nil {
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t.Fatalf("getPrimaryKeyHandle() failed: %v", err)
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}
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if ekHnd != commonEkEquivalentHandle {
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t.Fatalf("bad EK-equivalent handle: got 0x%x, wanted 0x%x", ekHnd, commonEkEquivalentHandle)
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}
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if p {
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t.Logf("generated a new key")
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} else {
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t.Logf("used existing key")
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}
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ekHnd, p, err = tpm.getPrimaryKeyHandle(commonEkEquivalentHandle)
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if err != nil {
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t.Fatalf("second getPrimaryKeyHandle() failed: %v", err)
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}
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if ekHnd != commonEkEquivalentHandle {
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t.Fatalf("bad EK-equivalent handle: got 0x%x, wanted 0x%x", ekHnd, commonEkEquivalentHandle)
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}
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if p {
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t.Fatalf("generated a new key the second time; that shouldn't happen")
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}
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}
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