// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_THIRD_PARTY_QUIC_CORE_CRYPTO_EPHEMERAL_KEY_SOURCE_H_
#define NET_THIRD_PARTY_QUIC_CORE_CRYPTO_EPHEMERAL_KEY_SOURCE_H_

#include "net/third_party/quic/core/crypto/key_exchange.h"
#include "net/third_party/quic/core/quic_time.h"
#include "net/third_party/quic/platform/api/quic_export.h"
#include "net/third_party/quic/platform/api/quic_string.h"
#include "net/third_party/quic/platform/api/quic_string_piece.h"

namespace quic {

class QuicRandom;

// EphemeralKeySource manages and rotates ephemeral keys as they can be reused
// for several connections in a short space of time. Since the implementation
// of this may involve locking or thread-local data, this interface abstracts
// that away.
class QUIC_EXPORT_PRIVATE EphemeralKeySource {
 public:
  virtual ~EphemeralKeySource() {}

  // CalculateForwardSecureKey generates an ephemeral public/private key pair
  // using the algorithm represented by |key_exchange_factory|, sets
  // |*public_value| to the public key and returns the shared key between
  // |peer_public_value| and the private key. |*public_value| will be sent to
  // the peer to be used with the peer's private key.
  virtual QuicString CalculateForwardSecureKey(
      const KeyExchange::Factory& key_exchange_factory,
      QuicRandom* rand,
      QuicTime now,
      QuicStringPiece peer_public_value,
      QuicString* public_value) = 0;
};

}  // namespace quic

#endif  // NET_THIRD_PARTY_QUIC_CORE_CRYPTO_EPHEMERAL_KEY_SOURCE_H_