mirror of
https://github.com/google/go-attestation.git
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5df8a8e979
* Add build tag to turn off TPM12 support and avoid tspi dependency * Add notspi build flag related information in README.md
98 lines
2.5 KiB
Go
98 lines
2.5 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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// +build linux,!gofuzz,cgo,!notspi
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package attest
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import (
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"fmt"
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"github.com/google/go-tspi/attestation"
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)
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// trousersKey12 represents a key bound to a TPM 1.2 device via tcsd.
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type trousersKey12 struct {
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blob []byte
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public []byte
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}
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func newTrousersKey12(blob, public []byte) ak {
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return &trousersKey12{
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blob: blob,
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public: public,
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}
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}
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// Marshal represents the key in a persistent format which may be
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// loaded at a later time using tpm.LoadKey().
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func (k *trousersKey12) marshal() ([]byte, error) {
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out := serializedKey{
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Encoding: keyEncodingEncrypted,
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TPMVersion: TPMVersion12,
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Blob: k.blob,
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Public: k.public,
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}
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return out.Serialize()
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}
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func (k *trousersKey12) close(tpm tpmBase) error {
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return nil // No state for tpm 1.2.
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}
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func (k *trousersKey12) activateCredential(tb tpmBase, in EncryptedCredential) ([]byte, error) {
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t, ok := tb.(*trousersTPM)
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if !ok {
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return nil, fmt.Errorf("expected *linuxTPM, got %T", tb)
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}
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cred, err := attestation.AIKChallengeResponse(t.ctx, k.blob, in.Credential, in.Secret)
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if err != nil {
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return nil, fmt.Errorf("failed to activate ak: %v", err)
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}
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return cred, nil
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}
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func (k *trousersKey12) quote(tb tpmBase, nonce []byte, alg HashAlg) (*Quote, error) {
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t, ok := tb.(*trousersTPM)
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if !ok {
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return nil, fmt.Errorf("expected *linuxTPM, got %T", tb)
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}
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if alg != HashSHA1 {
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return nil, fmt.Errorf("only SHA1 algorithms supported on TPM 1.2, not %v", alg)
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}
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quote, rawSig, err := attestation.GetQuote(t.ctx, k.blob, nonce)
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if err != nil {
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return nil, fmt.Errorf("Quote() failed: %v", err)
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}
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return &Quote{
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Version: TPMVersion12,
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Quote: quote,
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Signature: rawSig,
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}, nil
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}
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func (k *trousersKey12) attestationParameters() AttestationParameters {
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return AttestationParameters{
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Public: k.public,
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UseTCSDActivationFormat: true,
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}
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}
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func (k *trousersKey12) certify(tb tpmBase, handle interface{}) (*CertificationParameters, error) {
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return nil, fmt.Errorf("not implemented")
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}
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