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/*
* Copyright (C) 2018 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.hardware.authsecret@1.0;
/**
* This security HAL allows vendor components to be cryptographically tied to
* the primary user's credential. For example, security hardware could require
* proof that the credential is known before applying updates.
*
* This HAL is optional so does not require an implementation on device.
*/
interface IAuthSecret {
/**
* When the primary user is unlocked, this method is passed a secret to
* prove that is has been successfully unlocked. The primary user can either
* be unlocked by a person entering their credential or by another party
* using an escrow token e.g. a device administrator.
*
* The first time this is called, the secret must be used to provision state
* that depends on the primary user's secret. The same secret must be passed
* on each call until the next factory reset.
*
* Upon factory reset, any dependence on the secret must be removed as that
* secret is now lost and must never be derived again. A new secret must be
* created for the new primary user which must be used to newly provision
* state the first time this method is called after factory reset.
*
* The secret must be at least 16 bytes.
*
* @param secret blob derived from the primary user's credential.
*/
oneway primaryUserCredential(vec<uint8_t> secret);
};
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