HandshakeContext.h

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/*
 *  Copyright (c) 2018-present, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree.
 */

#pragma once

#include <fizz/record/Types.h>
#include <folly/ssl/OpenSSLHash.h>

namespace fizz {

class HandshakeContext {
 public:
  virtual ~HandshakeContext() = default;

  virtual void appendToTranscript(const Buf& transcript) = 0;

  virtual Buf getHandshakeContext() const = 0;

  virtual Buf getFinishedData(folly::ByteRange baseKey) const = 0;

  virtual folly::ByteRange getBlankContext() const = 0;
};

template <typename Hash>
class HandshakeContextImpl : public HandshakeContext {
 public:
  HandshakeContextImpl(const std::string& hkdfLabelPrefix);

  void appendToTranscript(const Buf& data) override;

  Buf getHandshakeContext() const override;

  Buf getFinishedData(folly::ByteRange baseKey) const override;

  folly::ByteRange getBlankContext() const override {
    return Hash::BlankHash;
  }

 private:
  folly::ssl::OpenSSLHash::Digest hashState_;
  std::string hkdfLabelPrefix_;
};
} // namespace fizz

#include <fizz/protocol/HandshakeContext-inl.h>