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ASCOfficeDocFile/DocDocxConverter/EncryptionHeader.cpp

+/*
+ * (c) Copyright Ascensio System SIA 2010-2016
+ *
+ * This program is a free software product. You can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License (AGPL)
+ * version 3 as published by the Free Software Foundation. In accordance with
+ * Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
+ * that Ascensio System SIA expressly excludes the warranty of non-infringement
+ * of any third-party rights.
+ *
+ * This program is distributed WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For
+ * details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
+ *
+ * You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia,
+ * EU, LV-1021.
+ *
+ * The  interactive user interfaces in modified source and object code versions
+ * of the Program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU AGPL version 3.
+ *
+ * Pursuant to Section 7(b) of the License you must retain the original Product
+ * logo when distributing the program. Pursuant to Section 7(e) we decline to
+ * grant you any rights under trademark law for use of our trademarks.
+ *
+ * All the Product's GUI elements, including illustrations and icon sets, as
+ * well as technical writing content are licensed under the terms of the
+ * Creative Commons Attribution-ShareAlike 4.0 International. See the License
+ * terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
+ *
+ */
+#include "EncryptionHeader.h"
+
+#define GETBIT(from, num) ((from & (1 << num)) != 0)
+
+namespace DocFileFormat
+{
+	EncryptionHeader::EncryptionHeader( FileInformationBlock* fib, POLE::Stream* tableStream )
+	{
+		VirtualStreamReader tStream( tableStream, 0, fib->m_bOlderVersion);
+
+		if (fib->m_FibBase.fObfuscation)
+		{
+			//xor
+			return;
+		}
+		unsigned short vMajor = tStream.ReadUInt16();
+		unsigned short vMinor = tStream.ReadUInt16();
+
+		if(0x0001 == vMajor) // RC4 encryption header structure
+		{// fib->m_FibBase.lKey == 52 
+			crypt_data.Salt.b1  = tStream.ReadUInt32();
+			crypt_data.Salt.b2  = tStream.ReadUInt32();
+			crypt_data.Salt.b3  = tStream.ReadUInt32();
+			crypt_data.Salt.b4  = tStream.ReadUInt32();
+			
+			crypt_data.EncryptedVerifier.b1  = tStream.ReadUInt32();
+			crypt_data.EncryptedVerifier.b2  = tStream.ReadUInt32();
+			crypt_data.EncryptedVerifier.b3  = tStream.ReadUInt32();
+			crypt_data.EncryptedVerifier.b4  = tStream.ReadUInt32();
+			
+			crypt_data.EncryptedVerifierHash.b1  = tStream.ReadUInt32();
+			crypt_data.EncryptedVerifierHash.b2  = tStream.ReadUInt32();
+			crypt_data.EncryptedVerifierHash.b3  = tStream.ReadUInt32();
+			crypt_data.EncryptedVerifierHash.b4  = tStream.ReadUInt32();
+		}
+		else
+		{
+		//	unsigned short flags = tStream.ReadUInt16();
+
+		//	bool fCryptoAPI	= GETBIT(flags, 2);
+		//	bool fDocProps	= GETBIT(flags, 3);
+		//	bool fExternal	= GETBIT(flags, 4);
+		//	bool fAES		= GETBIT(flags, 5);
+
+		//	_UINT32 EncryptionHeaderSize = tStream.ReadUInt32();
+		////header
+		//	
+		//	tStream.ReadUInt32(); // reserved (SizeExtra)
+		//	_INT32	AlgID			= tStream.ReadInt32();
+		//	_INT32	AlgIDHash		= tStream.ReadInt32();
+		//	_UINT32	KeySize			= tStream.ReadUInt32();
+		//	_UINT32	ProviderType	= tStream.ReadUInt32();
+
+		//	tStream.ReadUInt32();
+		//	tStream.ReadUInt32(); // reserved
+		//	
+		//	//std::wstring	CSPName;
+		//	//record >> CSPName;
+
+		//// + crypt_data
+		}
+
+		//RELEASEARRAYOBJECTS( bytes );
+	}
+
+}

ASCOfficeDocFile/DocDocxConverter/EncryptionHeader.h

+/*
+ * (c) Copyright Ascensio System SIA 2010-2016
+ *
+ * This program is a free software product. You can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License (AGPL)
+ * version 3 as published by the Free Software Foundation. In accordance with
+ * Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
+ * that Ascensio System SIA expressly excludes the warranty of non-infringement
+ * of any third-party rights.
+ *
+ * This program is distributed WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For
+ * details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
+ *
+ * You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia,
+ * EU, LV-1021.
+ *
+ * The  interactive user interfaces in modified source and object code versions
+ * of the Program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU AGPL version 3.
+ *
+ * Pursuant to Section 7(b) of the License you must retain the original Product
+ * logo when distributing the program. Pursuant to Section 7(e) we decline to
+ * grant you any rights under trademark law for use of our trademarks.
+ *
+ * All the Product's GUI elements, including illustrations and icon sets, as
+ * well as technical writing content are licensed under the terms of the
+ * Creative Commons Attribution-ShareAlike 4.0 International. See the License
+ * terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
+ *
+ */
+#pragma once
+
+#include "FileInformationBlock.h"
+
+#include "IVisitable.h"
+
+namespace DocFileFormat
+{
+    class IVisible;
+    class FileInformationBlock;
+
+	class EncryptionHeader: public IVisitable
+	{
+    public:
+        friend class WordDocument;
+       
+		virtual ~EncryptionHeader(){}
+        
+		EncryptionHeader( FileInformationBlock* fib, POLE::Stream* tableStream );
+	private:    
+		CRYPT::CryptRC4Data			crypt_data;
+	};
+}