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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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 android.security;
import java.security.KeyPair;
import java.security.cert.Certificate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* The {@code AttestedKeyPair} class contains a {@code KeyPair} instance of
* keys generated by Keystore and owned by KeyChain, as well as an attestation
* record for the key.
*
* <p>Such keys can be obtained by calling
* {@link android.app.admin.DevicePolicyManager#generateKeyPair}.
*/
public final class AttestedKeyPair {
private final KeyPair mKeyPair;
private final Certificate[] mAttestationRecord;
/**
* @hide Only created by the platform, no need to expose as public API.
*/
public AttestedKeyPair(KeyPair keyPair, Certificate[] attestationRecord) {
mKeyPair = keyPair;
mAttestationRecord = attestationRecord;
}
/**
* Returns the generated key pair associated with the attestation record
* in this instance.
*/
public KeyPair getKeyPair() {
return mKeyPair;
}
/**
* Returns the attestation record for the key pair in this instance.
*
* The attestation record is a chain of certificates. The leaf certificate links to the public
* key of this key pair and other properties of the key or the device. If the key is in secure
* hardware, and if the secure hardware supports attestation, the leaf certificate will be
* signed by a chain of certificates rooted at a trustworthy CA key. Otherwise the chain will be
* rooted at an untrusted certificate.
*
* The attestation record could be for properties of the key, or include device identifiers.
*
* See {@link android.security.keystore.KeyGenParameterSpec.Builder#setAttestationChallenge}
* and <a href="https://developer.android.com/training/articles/security-key-attestation.html">
* Key Attestation</a> for the format of the attestation record inside the certificate.
*/
public List<Certificate> getAttestationRecord() {
if (mAttestationRecord == null) {
return new ArrayList();
}
return Arrays.asList(mAttestationRecord);
}
}
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