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90e37eacce
* Refactor serialized keys into own structure, in preparation for making Key an interface. * Refactor key logic into separate structures for each platform/TPMversion invariant. * Implement review feedback
70 lines
2.3 KiB
Go
70 lines
2.3 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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"encoding/json"
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"fmt"
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)
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// serializedKey represents a loadable, TPM-backed key.
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type serializedKey struct {
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// Encoding describes the strategy by which the key should be
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// loaded/unloaded.
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Encoding keyEncoding `json:"KeyEncoding"`
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// TPMVersion describes the version of the TPM which the key was generated
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// on. deserializeKey() returns an error if it attempts to deserialize a key
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// which is from a different TPM version to the currently opened TPM.
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TPMVersion TPMVersion
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// Public represents the public key, in a TPM-specific format. This
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// field is populated on all platforms and TPM versions.
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Public []byte
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// The following fields are only valid for TPM 2.0 hardware, holding
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// information returned as the result to a TPM2_CertifyCreation command.
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// These are stored alongside the key for later use, as the certification
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// can only be obtained immediately after the key is generated.
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CreateData []byte
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CreateAttestation []byte
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CreateSignature []byte
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// Name is only valid for KeyEncodingOSManaged, which is only used
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// on Windows.
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Name string
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// Blob represents the key material for KeyEncodingEncrypted keys. This
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// is only used on Linux.
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Blob []byte `json:"KeyBlob"`
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}
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// Serialize represents the key in a persistent format which may be
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// loaded at a later time using deserializeKey().
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func (k *serializedKey) Serialize() ([]byte, error) {
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return json.Marshal(k)
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}
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func deserializeKey(b []byte, version TPMVersion) (*serializedKey, error) {
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var k serializedKey
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var err error
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if err = json.Unmarshal(b, &k); err != nil {
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return nil, fmt.Errorf("json.Unmarshal() failed: %v", err)
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}
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if k.TPMVersion != version {
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return nil, fmt.Errorf("key for different TPM version: %v", k.TPMVersion)
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}
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return &k, nil
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}
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