net/quic/crypto/curve25519_key_exchange.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NET_QUIC_CRYPTO_CURVE25519_KEY_EXCHANGE_H_
   6 #define NET_QUIC_CRYPTO_CURVE25519_KEY_EXCHANGE_H_
   7
   8 #include <string>
   9
  10 #include "base/compiler_specific.h"
  11 #include "base/strings/string_piece.h"
  12 #include "net/base/net_export.h"
  13 #include "net/quic/crypto/key_exchange.h"
  14
  15 namespace net {
  16
  17 class QuicRandom;
  18
  19 // Curve25519KeyExchange implements a KeyExchange using elliptic-curve
  20 // Diffie-Hellman on curve25519. See http://cr.yp.to/ecdh.html
  21 class NET_EXPORT_PRIVATE Curve25519KeyExchange : public KeyExchange {
  22  public:
  23   ~Curve25519KeyExchange() override;
  24
  25   // New creates a new object from a private key. If the private key is
  26   // invalid, nullptr is returned.
  27   static Curve25519KeyExchange* New(const base::StringPiece& private_key);
  28
  29   // NewPrivateKey returns a private key, generated from |rand|, suitable for
  30   // passing to |New|.
  31   static std::string NewPrivateKey(QuicRandom* rand);
  32
  33   // KeyExchange interface.
  34   KeyExchange* NewKeyPair(QuicRandom* rand) const override;
  35   bool CalculateSharedKey(const base::StringPiece& peer_public_value,
  36                           std::string* shared_key) const override;
  37   base::StringPiece public_value() const override;
  38   QuicTag tag() const override;
  39
  40  private:
  41   Curve25519KeyExchange();
  42
  43   uint8 private_key_[32];
  44   uint8 public_key_[32];
  45 };
  46
  47 }  // namespace net
  48
  49 #endif  // NET_QUIC_CRYPTO_CURVE25519_KEY_EXCHANGE_H_