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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 "symmetric_key.h"
namespace keymaster {
const size_t kMinHmacLengthBits = 64;
const size_t kMinHmacKeyLengthBits = 64;
const size_t kMaxHmacKeyLengthBits = 2048; // Some RFC test cases require >1024-bit keys
class HmacKeyFactory : public SymmetricKeyFactory {
public:
explicit HmacKeyFactory(const SoftwareKeyBlobMaker& blob_maker,
const RandomSource& random_source)
: SymmetricKeyFactory(blob_maker, random_source) {}
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 > 0 && key_size_bits % 8 == 00 &&
key_size_bits >= kMinHmacKeyLengthBits && key_size_bits <= kMaxHmacKeyLengthBits;
}
keymaster_error_t validate_algorithm_specific_new_key_params(
const AuthorizationSet& key_description) const override;
};
class HmacKey : public SymmetricKey {
public:
HmacKey(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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