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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.
*/
#pragma once
#include <openssl/aes.h>
#include "symmetric_key.h"
namespace keymaster {
const size_t kMinGcmTagLength = 12 * 8;
const size_t kMaxGcmTagLength = 16 * 8;
class AesKeyFactory : public SymmetricKeyFactory {
public:
explicit AesKeyFactory(const SoftwareKeyBlobMaker& blob_maker,
const RandomSource& random_source)
: SymmetricKeyFactory(blob_maker, random_source) {}
keymaster_algorithm_t registry_key() const { return KM_ALGORITHM_AES; }
keymaster_error_t LoadKey(KeymasterKeyBlob&& key_material,
const AuthorizationSet& additional_params,
AuthorizationSet&& hw_enforced, AuthorizationSet&& sw_enforced,
UniquePtr<Key>* key) const override;
OperationFactory* GetOperationFactory(keymaster_purpose_t purpose) const override;
private:
bool key_size_supported(size_t key_size_bits) const override {
return key_size_bits == 128 || key_size_bits == 192 || key_size_bits == 256;
}
keymaster_error_t validate_algorithm_specific_new_key_params(
const AuthorizationSet& key_description) const override;
};
class AesKey : public SymmetricKey {
public:
AesKey(KeymasterKeyBlob&& key_material, AuthorizationSet&& hw_enforced,
AuthorizationSet&& sw_enforced, const KeyFactory* key_factory)
: SymmetricKey(move(key_material), move(hw_enforced), move(sw_enforced), key_factory) {}
};
} // namespace keymaster
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