Split off IPDF_CryptoHandler into its own .cpp/.h files

core/include/fpdfapi/ipdf_crypto_handler.h

Index: core/include/fpdfapi/ipdf_crypto_handler.h
diff --git a/core/include/fpdfapi/ipdf_crypto_handler.h b/core/include/fpdfapi/ipdf_crypto_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..fd7b5c86128f1762280805407242a7a9b1a40f11
--- /dev/null
+++ b/core/include/fpdfapi/ipdf_crypto_handler.h
@@ -0,0 +1,46 @@
+// 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_INCLUDE_FPDFAPI_IPDF_CRYPTO_HANDLER_H_
+#define CORE_INCLUDE_FPDFAPI_IPDF_CRYPTO_HANDLER_H_
+
+#include "core/include/fxcrt/fx_string.h"
+#include "core/include/fxcrt/fx_system.h"
+
+class CPDF_Dictionary;
+class IPDF_SecurityHandler;
+
+class IPDF_CryptoHandler {
+ public:
+  virtual ~IPDF_CryptoHandler() {}
+
+  virtual FX_BOOL Init(CPDF_Dictionary* pEncryptDict,
+                       IPDF_SecurityHandler* pSecurityHandler) = 0;
+
+  virtual FX_DWORD DecryptGetSize(FX_DWORD src_size) = 0;
+  virtual void* DecryptStart(FX_DWORD objnum, FX_DWORD gennum) = 0;
+  virtual FX_BOOL DecryptStream(void* context,
+                                const uint8_t* src_buf,
+                                FX_DWORD src_size,
+                                CFX_BinaryBuf& dest_buf) = 0;
+
+  virtual FX_BOOL DecryptFinish(void* context, CFX_BinaryBuf& dest_buf) = 0;
+  virtual FX_DWORD EncryptGetSize(FX_DWORD objnum,
+                                  FX_DWORD version,
+                                  const uint8_t* src_buf,
+                                  FX_DWORD src_size) = 0;
+
+  virtual FX_BOOL EncryptContent(FX_DWORD objnum,
+                                 FX_DWORD version,
+                                 const uint8_t* src_buf,
+                                 FX_DWORD src_size,
+                                 uint8_t* dest_buf,
+                                 FX_DWORD& dest_size) = 0;
+
+  void Decrypt(FX_DWORD objnum, FX_DWORD version, CFX_ByteString& str);
+};
+
+#endif  // CORE_INCLUDE_FPDFAPI_IPDF_CRYPTO_HANDLER_H_