mirror of
https://github.com/google/go-attestation.git
synced 2024-12-18 20:47:57 +00:00
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.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
|
|
// use this file except in compliance with the License. You may obtain a copy of
|
|
// the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
// License for the specific language governing permissions and limitations under
|
|
// the License.
|
|
|
|
package attest
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
)
|
|
|
|
// serializedKey represents a loadable, TPM-backed key.
|
|
type serializedKey struct {
|
|
// Encoding describes the strategy by which the key should be
|
|
// loaded/unloaded.
|
|
Encoding keyEncoding `json:"KeyEncoding"`
|
|
// TPMVersion describes the version of the TPM which the key was generated
|
|
// on. deserializeKey() returns an error if it attempts to deserialize a key
|
|
// which is from a different TPM version to the currently opened TPM.
|
|
TPMVersion TPMVersion
|
|
|
|
// Public represents the public key, in a TPM-specific format. This
|
|
// field is populated on all platforms and TPM versions.
|
|
Public []byte
|
|
// The following fields are only valid for TPM 2.0 hardware, holding
|
|
// information returned as the result to a TPM2_CertifyCreation command.
|
|
// These are stored alongside the key for later use, as the certification
|
|
// can only be obtained immediately after the key is generated.
|
|
CreateData []byte
|
|
CreateAttestation []byte
|
|
CreateSignature []byte
|
|
|
|
// Name is only valid for KeyEncodingOSManaged, which is only used
|
|
// on Windows.
|
|
Name string
|
|
// Blob represents the key material for KeyEncodingEncrypted keys. This
|
|
// is only used on Linux.
|
|
Blob []byte `json:"KeyBlob"`
|
|
}
|
|
|
|
// Serialize represents the key in a persistent format which may be
|
|
// loaded at a later time using deserializeKey().
|
|
func (k *serializedKey) Serialize() ([]byte, error) {
|
|
return json.Marshal(k)
|
|
}
|
|
|
|
func deserializeKey(b []byte, version TPMVersion) (*serializedKey, error) {
|
|
var k serializedKey
|
|
var err error
|
|
if err = json.Unmarshal(b, &k); err != nil {
|
|
return nil, fmt.Errorf("json.Unmarshal() failed: %v", err)
|
|
}
|
|
|
|
if k.TPMVersion != version {
|
|
return nil, fmt.Errorf("key for different TPM version: %v", k.TPMVersion)
|
|
}
|
|
|
|
return &k, nil
|
|
}
|