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diff --git a/chromium/net/quic/crypto/crypto_secret_boxer.h b/chromium/net/quic/crypto/crypto_secret_boxer.h
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+++ b/chromium/net/quic/crypto/crypto_secret_boxer.h
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+// 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_CRYPTO_SECRET_BOXER_H_
+#define NET_QUIC_CRYPTO_CRYPTO_SECRET_BOXER_H_
+
+#include <string>
+
+#include "base/strings/string_piece.h"
+#include "net/base/net_export.h"
+
+namespace net {
+
+class QuicRandom;
+
+// CryptoSecretBoxer encrypts small chunks of plaintext (called 'boxing') and
+// then, later, can authenticate+decrypt the resulting boxes. This object is
+// thread-safe.
+class NET_EXPORT_PRIVATE CryptoSecretBoxer {
+ public:
+  // GetKeySize returns the number of bytes in a key.
+  static size_t GetKeySize();
+
+  // SetKey sets the key for this object. This must be done before |Box| or
+  // |Unbox| are called. |key| must be |GetKeySize()| bytes long.
+  void SetKey(base::StringPiece key);
+
+  // Box encrypts |plaintext| using a random nonce generated from |rand| and
+  // returns the resulting ciphertext. Since an authenticator and nonce are
+  // included, the result will be slightly larger than |plaintext|.
+  std::string Box(QuicRandom* rand, base::StringPiece plaintext) const;
+
+  // Unbox takes the result of a previous call to |Box| in |ciphertext| and
+  // authenticates+decrypts it. If |ciphertext| is not authentic then it
+  // returns false. Otherwise, |out_storage| is used to store the result and
+  // |out| is set to point into |out_storage| and contains the original
+  // plaintext.
+  bool Unbox(base::StringPiece ciphertext,
+             std::string* out_storage,
+             base::StringPiece* out) const;
+
+ private:
+  std::string key_;
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_CRYPTO_CRYPTO_SECRET_BOXER_H_