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/*
* Copyright 2014 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.
*/
#ifndef SYSTEM_KEYMASTER_KEY_H_
#define SYSTEM_KEYMASTER_KEY_H_
#include <utility>
#include <assert.h>
#include <hardware/keymaster_defs.h>
#include <keymaster/UniquePtr.h>
#include <keymaster/android_keymaster_utils.h>
#include <keymaster/authorization_set.h>
namespace keymaster {
class KeyFactory;
class Key {
public:
virtual ~Key() {}
Key(const Key&) = delete;
void operator=(const Key&) = delete;
/**
* Return a copy of raw key material, in the specified format.
*/
virtual keymaster_error_t formatted_key_material(keymaster_key_format_t format,
UniquePtr<uint8_t[]>* material,
size_t* size) const = 0;
AuthProxy authorizations() const { return AuthProxy(hw_enforced_, sw_enforced_); }
const AuthorizationSet& hw_enforced() const { return hw_enforced_; }
const AuthorizationSet& sw_enforced() const { return sw_enforced_; }
AuthorizationSet& hw_enforced() { return hw_enforced_; }
AuthorizationSet& sw_enforced() { return sw_enforced_; }
const KeymasterKeyBlob& key_material() const { return key_material_; }
KeymasterKeyBlob& key_material() { return key_material_; }
// Methods to move data out of the key. These could be overloads of the methods above, with ref
// qualifiers, but naming them differently makes it harder to accidentally make a temporary copy
// when we mean to move.
AuthorizationSet&& hw_enforced_move() { return std::move(hw_enforced_); }
AuthorizationSet&& sw_enforced_move() { return std::move(sw_enforced_); }
KeymasterKeyBlob&& key_material_move() { return std::move(key_material_); }
const KeyFactory* key_factory() const { return key_factory_; }
const KeyFactory*& key_factory() { return key_factory_; }
void set_secure_deletion_slot(uint32_t slot) { secure_deletion_slot_ = slot; }
uint32_t secure_deletion_slot() const { return secure_deletion_slot_; }
protected:
Key(AuthorizationSet&& hw_enforced, AuthorizationSet&& sw_enforced,
const KeyFactory* key_factory)
: hw_enforced_(std::move(hw_enforced)), sw_enforced_(std::move(sw_enforced)),
key_factory_(key_factory) {}
protected:
AuthorizationSet hw_enforced_;
AuthorizationSet sw_enforced_;
KeymasterKeyBlob key_material_;
const KeyFactory* key_factory_;
uint32_t secure_deletion_slot_ = 0;
};
} // namespace keymaster
#endif // SYSTEM_KEYMASTER_KEY_H_
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