81 lines
3 KiB
C++
81 lines
3 KiB
C++
/*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SYSTEM_KEYMASTER_SYMMETRIC_KEY_H_
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#define SYSTEM_KEYMASTER_SYMMETRIC_KEY_H_
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#include <keymaster/key_factory.h>
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#include "key.h"
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namespace keymaster {
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class SymmetricKey;
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class SymmetricKeyFactory : public KeyFactory {
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public:
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explicit SymmetricKeyFactory(const KeymasterContext* context) : KeyFactory(context) {}
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keymaster_error_t GenerateKey(const AuthorizationSet& key_description,
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KeymasterKeyBlob* key_blob, AuthorizationSet* hw_enforced,
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AuthorizationSet* sw_enforced) const override;
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keymaster_error_t ImportKey(const AuthorizationSet& key_description,
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keymaster_key_format_t input_key_material_format,
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const KeymasterKeyBlob& input_key_material,
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KeymasterKeyBlob* output_key_blob, AuthorizationSet* hw_enforced,
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AuthorizationSet* sw_enforced) const override;
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virtual const keymaster_key_format_t* SupportedImportFormats(size_t* format_count) const override;
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virtual const keymaster_key_format_t* SupportedExportFormats(size_t* format_count) const override {
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return NoFormats(format_count);
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};
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private:
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virtual bool key_size_supported(size_t key_size_bits) const = 0;
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virtual keymaster_error_t
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validate_algorithm_specific_new_key_params(const AuthorizationSet& key_description) const = 0;
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const keymaster_key_format_t* NoFormats(size_t* format_count) const {
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*format_count = 0;
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return NULL;
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}
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};
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class SymmetricKey : public Key {
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public:
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~SymmetricKey();
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virtual keymaster_error_t key_material(UniquePtr<uint8_t[]>* key_material, size_t* size) const;
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virtual keymaster_error_t formatted_key_material(keymaster_key_format_t, UniquePtr<uint8_t[]>*,
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size_t*) const {
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return KM_ERROR_UNSUPPORTED_KEY_FORMAT;
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}
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const uint8_t* key_data() const { return key_data_.get(); }
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size_t key_data_size() const { return key_data_size_; }
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protected:
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SymmetricKey(const KeymasterKeyBlob& key_material, const AuthorizationSet& hw_enforced,
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const AuthorizationSet& sw_enforced, keymaster_error_t* error);
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private:
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size_t key_data_size_;
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UniquePtr<uint8_t[]> key_data_;
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};
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} // namespace keymaster
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#endif // SYSTEM_KEYMASTER_AES_KEY_H_
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