58 lines
2.2 KiB
C++
58 lines
2.2 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_HMAC_KEY_H_
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#define SYSTEM_KEYMASTER_HMAC_KEY_H_
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#include "symmetric_key.h"
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namespace keymaster {
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const size_t kMinHmacLengthBits = 64;
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const size_t kMinHmacKeyLengthBits = 64;
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const size_t kMaxHmacKeyLengthBits = 2048; // Some RFC test cases require >1024-bit keys
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class HmacKeyFactory : public SymmetricKeyFactory {
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public:
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explicit HmacKeyFactory(const KeymasterContext* context) : SymmetricKeyFactory(context) {}
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keymaster_error_t LoadKey(const KeymasterKeyBlob& key_material,
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const AuthorizationSet& additional_params,
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const AuthorizationSet& hw_enforced,
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const AuthorizationSet& sw_enforced,
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UniquePtr<Key>* key) const override;
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OperationFactory* GetOperationFactory(keymaster_purpose_t purpose) const override;
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private:
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bool key_size_supported(size_t key_size_bits) const override {
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return key_size_bits > 0 && key_size_bits % 8 == 00 &&
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key_size_bits >= kMinHmacKeyLengthBits && key_size_bits <= kMaxHmacKeyLengthBits;
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}
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keymaster_error_t validate_algorithm_specific_new_key_params(
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const AuthorizationSet& key_description) const override;
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};
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class HmacKey : public SymmetricKey {
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public:
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HmacKey(const KeymasterKeyBlob& key_material, const AuthorizationSet& hw_enforced,
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const AuthorizationSet& sw_enforced, keymaster_error_t* error)
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: SymmetricKey(key_material, hw_enforced, sw_enforced, error) {}
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};
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} // namespace keymaster
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#endif // SYSTEM_KEYMASTER_HMAC_KEY_H_
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