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/* Copyright 2019, The Android Open Source Project, 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 com.google.android.attestation;
import static com.google.android.attestation.Constants.KM_VERIFIED_BOOT_STATE_FAILED;
import static com.google.android.attestation.Constants.KM_VERIFIED_BOOT_STATE_SELF_SIGNED;
import static com.google.android.attestation.Constants.KM_VERIFIED_BOOT_STATE_UNVERIFIED;
import static com.google.android.attestation.Constants.KM_VERIFIED_BOOT_STATE_VERIFIED;
import static com.google.android.attestation.Constants.ROOT_OF_TRUST_DEVICE_LOCKED_INDEX;
import static com.google.android.attestation.Constants.ROOT_OF_TRUST_VERIFIED_BOOT_HASH_INDEX;
import static com.google.android.attestation.Constants.ROOT_OF_TRUST_VERIFIED_BOOT_KEY_INDEX;
import static com.google.android.attestation.Constants.ROOT_OF_TRUST_VERIFIED_BOOT_STATE_INDEX;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Sequence;
/**
* This collection of values defines key information about the device's status.
*/
public class RootOfTrust {
public final byte[] verifiedBootKey;
public final boolean deviceLocked;
public final VerifiedBootState verifiedBootState;
public final byte[] verifiedBootHash;
private RootOfTrust(ASN1Sequence rootOfTrust) {
this.verifiedBootKey =
((ASN1OctetString) rootOfTrust.getObjectAt(ROOT_OF_TRUST_VERIFIED_BOOT_KEY_INDEX))
.getOctets();
this.deviceLocked =
ASN1Parsing.getBooleanFromAsn1(rootOfTrust.getObjectAt(ROOT_OF_TRUST_DEVICE_LOCKED_INDEX));
this.verifiedBootState =
rootOfTrustToEnum(
ASN1Parsing.getIntegerFromAsn1(rootOfTrust.getObjectAt(ROOT_OF_TRUST_VERIFIED_BOOT_STATE_INDEX)));
this.verifiedBootHash =
((ASN1OctetString) rootOfTrust.getObjectAt(ROOT_OF_TRUST_VERIFIED_BOOT_HASH_INDEX))
.getOctets();
}
static RootOfTrust createRootOfTrust(ASN1Sequence rootOfTrust) {
if (rootOfTrust == null) {
return null;
}
return new RootOfTrust(rootOfTrust);
}
private static VerifiedBootState rootOfTrustToEnum(int securityLevel) {
switch (securityLevel) {
case KM_VERIFIED_BOOT_STATE_VERIFIED:
return VerifiedBootState.VERIFIED;
case KM_VERIFIED_BOOT_STATE_SELF_SIGNED:
return VerifiedBootState.SELFSIGNED;
case KM_VERIFIED_BOOT_STATE_UNVERIFIED:
return VerifiedBootState.UNVERIFIED;
case KM_VERIFIED_BOOT_STATE_FAILED:
return VerifiedBootState.FAILED;
default:
throw new IllegalArgumentException("Invalid verified boot state.");
}
}
/**
* This provides the device's current boot state, which represents the level of protection
* provided to the user and to apps after the device finishes booting.
*/
public enum VerifiedBootState {
VERIFIED,
SELFSIGNED,
UNVERIFIED,
FAILED
}
}
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