72 lines
No EOL
2.2 KiB
C++
72 lines
No EOL
2.2 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_NIST_CURVE_KEY_EXCHANGE_H_
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#define SYSTEM_KEYMASTER_NIST_CURVE_KEY_EXCHANGE_H_
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#include "key_exchange.h"
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#include <keymaster/authorization_set.h>
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#include <hardware/keymaster_defs.h>
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#include <keymaster/UniquePtr.h>
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#include "openssl_utils.h"
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namespace keymaster {
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/**
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* NistCurveKeyExchange implements a KeyExchange using elliptic-curve
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* Diffie-Hellman on NIST curves: P-224, P-256, P-384 and P-521.
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*/
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class NistCurveKeyExchange : public KeyExchange {
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public:
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~NistCurveKeyExchange() override {}
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/**
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* NistCurveKeyExchange takes ownership of \p private_key.
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*/
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NistCurveKeyExchange(EC_KEY* private_key, keymaster_error_t* error);
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/**
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* GenerateKeyExchange generates a new public/private key pair on a NIST curve and returns
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* a new key exchange object.
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*/
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static NistCurveKeyExchange* GenerateKeyExchange(keymaster_ec_curve_t curve);
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/**
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* KeyExchange interface.
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*/
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bool CalculateSharedKey(const uint8_t* peer_public_value, size_t peer_public_value_len,
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Buffer* shared_key) const override;
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bool CalculateSharedKey(const Buffer& peer_public_value, Buffer* shared_key) const override;
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bool public_value(Buffer* public_value) const override;
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/* Caller takes ownership of \p private_key. */
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EC_KEY* private_key() { return private_key_.release(); }
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private:
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keymaster_error_t ExtractPublicKey();
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UniquePtr<EC_KEY, EC_KEY_Delete> private_key_;
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UniquePtr<uint8_t[]> public_key_;
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size_t public_key_len_;
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size_t shared_secret_len_;
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};
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} // namespace keymaster
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#endif // SYSTEM_KEYMASTER_NIST_CURVE_KEY_EXCHANGE_H_
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