QUIC - Some sketching of the crypto handshake.

net/quic/crypto/curve25519_key_exchange.h

+// 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_QUIC_CRYPTO_CURVE25519_KEY_EXCHANGE_H_
+#define NET_QUIC_CRYPTO_CURVE25519_KEY_EXCHANGE_H_
+
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "base/string_piece.h"
+#include "net/base/net_export.h"
+#include "net/quic/crypto/key_exchange.h"
+
+namespace net {
+
+class QuicRandom;
+
+// Curve25519KeyExchange implements a KeyExchange using elliptic-curve
+// Diffie-Hellman on curve25519. See http://cr.yp.to/ecdh.html
+class NET_EXPORT_PRIVATE Curve25519KeyExchange : public KeyExchange {
+ public:
+  virtual ~Curve25519KeyExchange();
+
+  // New creates a new object from a private key. If the private key is
+  // invalid, NULL is returned.
+  static Curve25519KeyExchange* New(const base::StringPiece& private_key);
+
+  // NewPrivateKey returns a private key, generated from |rand|, suitable for
+  // passing to |New|.
+  static std::string NewPrivateKey(QuicRandom* rand);
+
+  // KeyExchange interface.
+  virtual bool CalculateSharedKey(const base::StringPiece& their_public_value,
+                                  std::string* shared_key) const OVERRIDE;
+  virtual base::StringPiece public_value() const OVERRIDE;
+  virtual CryptoTag tag() const OVERRIDE;
+
+ private:
+  Curve25519KeyExchange();
+
+// TODO(rtenneti): Add support for curve25519.
+#if 0
+  uint8 private_key_[32];
+#endif
+  uint8 public_key_[32];
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_CRYPTO_CURVE25519_KEY_EXCHANGE_H_