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diff --git a/core/fpdfapi/fpdf_parser/ipdf_security_handler.h b/core/fpdfapi/fpdf_parser/ipdf_security_handler.h
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+++ b/core/fpdfapi/fpdf_parser/ipdf_security_handler.h
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+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FPDFAPI_FPDF_PARSER_IPDF_SECURITY_HANDLER_H_
+#define CORE_FPDFAPI_FPDF_PARSER_IPDF_SECURITY_HANDLER_H_
+
+#include "core/include/fxcrt/fx_system.h"
+
+class CPDF_Parser;
+class CPDF_Dictionary;
+class IPDF_CryptoHandler;
+
+#define FXCIPHER_NONE 0
+#define FXCIPHER_RC4 1
+#define FXCIPHER_AES 2
+#define FXCIPHER_AES2 3
+
+class IPDF_SecurityHandler {
+ public:
+  virtual ~IPDF_SecurityHandler();
+  virtual FX_BOOL OnInit(CPDF_Parser* pParser,
+                         CPDF_Dictionary* pEncryptDict) = 0;
+
+  virtual FX_DWORD GetPermissions() = 0;
+  virtual FX_BOOL GetCryptInfo(int& cipher,
+                               const uint8_t*& buffer,
+                               int& keylen) = 0;
+
+  virtual FX_BOOL IsMetadataEncrypted() = 0;
+  virtual IPDF_CryptoHandler* CreateCryptoHandler() = 0;
+};
+
+#endif  // CORE_FPDFAPI_FPDF_PARSER_IPDF_SECURITY_HANDLER_H_