61 lines
2 KiB
C++
61 lines
2 KiB
C++
/*
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* Copyright 2015 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_ECIES_KEM_H_
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#define SYSTEM_KEYMASTER_ECIES_KEM_H_
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#include "kem.h"
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#include <keymaster/UniquePtr.h>
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#include <openssl/ec.h>
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#include <keymaster/authorization_set.h>
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#include "hkdf.h"
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#include "key_exchange.h"
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namespace keymaster {
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/**
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* EciesKem is an implementation of the key encapsulation mechanism ECIES-KEM described in
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* ISO 18033-2 (http://www.shoup.net/iso/std6.pdf, http://www.shoup.net/papers/iso-2_1.pdf).
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*/
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class EciesKem : public Kem {
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public:
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virtual ~EciesKem() override {}
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EciesKem(const AuthorizationSet& kem_description, keymaster_error_t* error);
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/* Kem interface. */
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bool Encrypt(const Buffer& peer_public_value, Buffer* output_clear_key,
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Buffer* output_encrypted_key) override;
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bool Encrypt(const uint8_t* peer_public_value, size_t peer_public_value_len,
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Buffer* output_clear_key, Buffer* output_encrypted_key) override;
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bool Decrypt(EC_KEY* private_key, const Buffer& encrypted_key, Buffer* output_key) override;
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bool Decrypt(EC_KEY* private_key, const uint8_t* encrypted_key, size_t encrypted_key_len,
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Buffer* output_key) override;
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private:
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UniquePtr<KeyExchange> key_exchange_;
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UniquePtr<Rfc5869Sha256Kdf> kdf_;
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bool single_hash_mode_;
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uint32_t key_bytes_to_generate_;
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keymaster_ec_curve_t curve_;
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};
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} // namespace keymaster
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#endif // SYSTEM_KEYMASTER_ECIES_KEM_H_
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