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/*
* Copyright 2015 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.
*/
#ifndef SYSTEM_KEYMASTER_KEY_EXCHANGE_H_
#define SYSTEM_KEYMASTER_KEY_EXCHANGE_H_
#include <openssl/ec.h>
#include <keymaster/serializable.h>
namespace keymaster {
/**
* KeyExchange is an abstract class that provides an interface to a
* key-exchange primitive.
*/
class KeyExchange {
public:
virtual ~KeyExchange() {}
/**
* CalculateSharedKey computes the shared key between the local private key
* (which is implicitly known by a KeyExchange object) and a public value
* from the peer.
*/
virtual bool CalculateSharedKey(const Buffer& peer_public_value, Buffer* shared_key) const = 0;
virtual bool CalculateSharedKey(const uint8_t* peer_public_value, size_t peer_public_value_len,
Buffer* shared_key) const = 0;
/**
* public_value writes to |public_value| the local public key which can be
* sent to a peer in order to complete a key exchange.
*/
virtual bool public_value(Buffer* public_value) const = 0;
};
} // namespace keymaster
#endif // SYSTEM_KEYMASTER_KEY_EXCHANGE_H_
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