Eran Messeri | 852c8f1 | 2017-11-15 05:55:52 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.security; |
| 18 | |
| 19 | import java.security.KeyPair; |
| 20 | import java.security.cert.Certificate; |
| 21 | import java.util.ArrayList; |
| 22 | import java.util.Arrays; |
| 23 | import java.util.List; |
| 24 | |
| 25 | /** |
| 26 | * The {@code AttestedKeyPair} class contains a {@code KeyPair} instance of |
| 27 | * keys generated by Keystore and owned by KeyChain, as well as an attestation |
| 28 | * record for the key. |
| 29 | * |
| 30 | * <p>Such keys can be obtained by calling |
| 31 | * {@link android.app.admin.DevicePolicyManager#generateKeyPair}. |
| 32 | */ |
| 33 | |
| 34 | public final class AttestedKeyPair { |
| 35 | private final KeyPair mKeyPair; |
| 36 | private final Certificate[] mAttestationRecord; |
| 37 | |
| 38 | /** |
| 39 | * @hide Only created by the platform, no need to expose as public API. |
| 40 | */ |
| 41 | public AttestedKeyPair(KeyPair keyPair, Certificate[] attestationRecord) { |
| 42 | mKeyPair = keyPair; |
| 43 | mAttestationRecord = attestationRecord; |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * Returns the generated key pair associated with the attestation record |
| 48 | * in this instance. |
| 49 | */ |
| 50 | public KeyPair getKeyPair() { |
| 51 | return mKeyPair; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Returns the attestation record for the key pair in this instance. |
| 56 | * |
| 57 | * The attestation record is a chain of certificates. The leaf certificate links to the public |
| 58 | * key of this key pair and other properties of the key or the device. If the key is in secure |
| 59 | * hardware, and if the secure hardware supports attestation, the leaf certificate will be |
| 60 | * signed by a chain of certificates rooted at a trustworthy CA key. Otherwise the chain will be |
| 61 | * rooted at an untrusted certificate. |
| 62 | * |
| 63 | * The attestation record could be for properties of the key, or include device identifiers. |
| 64 | * |
| 65 | * See {@link android.security.keystore.KeyGenParameterSpec.Builder#setAttestationChallenge} |
| 66 | * and <a href="https://developer.android.com/training/articles/security-key-attestation.html"> |
| 67 | * Key Attestation</a> for the format of the attestation record inside the certificate. |
| 68 | */ |
| 69 | public List<Certificate> getAttestationRecord() { |
| 70 | if (mAttestationRecord == null) { |
| 71 | return new ArrayList(); |
| 72 | } |
| 73 | return Arrays.asList(mAttestationRecord); |
| 74 | } |
| 75 | } |