Add QuicFramer and friends.

net/quic/crypto/quic_encrypter.h

+// Copyright (c) 2012 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_QUIC_ENCRYPTER_H_
+#define NET_QUIC_CRYPTO_QUIC_ENCRYPTER_H_
+
+#include "net/base/net_export.h"
+#include "net/quic/crypto/crypto_protocol.h"
+#include "net/quic/quic_protocol.h"
+
+namespace net {
+
+class NET_EXPORT_PRIVATE QuicEncrypter {
+ public:
+  virtual ~QuicEncrypter() {}
+
+  static QuicEncrypter* Create(CryptoTag algorithm);
+
+  // Returns a newly created QuicData object containing the encrypted
+  // |plaintext| as well as a MAC over both |plaintext| and |associated_data|,
+  // or NULL if there is an error.
+  virtual QuicData* Encrypt(base::StringPiece associated_data,
+                            base::StringPiece plaintext) = 0;
+
+  // Returns the maximum length of plaintext that can be encrypted
+  // to ciphertext no larger than |ciphertext_size|.
+  virtual size_t GetMaxPlaintextSize(size_t ciphertext_size) = 0;
+
+  // Returns the length of the ciphertext that would be generated by encrypting
+  // to plaintext of size |plaintext_size|.
+  virtual size_t GetCiphertextSize(size_t plaintext_size) = 0;
+
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_CRYPTO_QUIC_ENCRYPTER_H_