VeraCrypt

Documentation >> Encryption Algorithms >> AES

AES

The Advanced Encryption Standard (AES) specifies a FIPS-approved cryptographic algorithm (Rijndael, designed by Joan Daemen and Vincent Rijmen, published in 1998) that may be used by US federal departments and agencies to cryptographically protect sensitive information [3]. VeraCrypt uses AES with 14 rounds and a 256-bit key (i.e., AES-256, published in 2001) operating in XTS mode (see the section Modes of Operation).
In June 2003, after the NSA (US National Security Agency) conducted a review and analysis of AES, the U.S. CNSS (Committee on National Security Systems) announced in [1] that the design and strength of AES-256 (and AES-192) are sufficient to protect classified information up to the Top Secret level. This is applicable to all U.S. Government Departments or Agencies that are considering the acquisition or use of products incorporating the Advanced Encryption Standard (AES) to satisfy Information Assurance requirements associated with the protection of national security systems and/or national security information [1].
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/*
 Derived from source code of TrueCrypt 7.1a, which is
 Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
 by the TrueCrypt License 3.0.

 Modifications and additions to the original source code (contained in this file)
 and all other portions of this file are Copyright (c) 2013-2017 IDRIX
 and are governed by the Apache License 2.0 the full text of which is
 contained in the file License.txt included in VeraCrypt binary and source
 code distribution packages.
*/

#ifndef TC_HEADER_Common_Exception
#define TC_HEADER_Common_Exception

#include "Platform/PlatformBase.h"
#include "Dlgcode.h"
#include "Language.h"
#include <strsafe.h>

namespace VeraCrypt
{
	struct Exception
	{
		virtual void Show (HWND parent) const = 0;
	};

	struct SystemException : public Exception
	{
		SystemException (const char *srcPos) : ErrorCode (GetLastError()), SrcPos (srcPos) { }

		void Show (HWND parent) const
		{
			SetLastError (ErrorCode);
			handleWin32Error (parent, SrcPos);
		}

		DWORD ErrorCode;
		const char *SrcPos;
	};

	struct ErrorException : public Exception
	{
		ErrorException (char *langId, const char *srcPos) : SrcPos (srcPos), ErrLangId (langId) { }
		ErrorException (const wstring &errMsg, const char *srcPos) : SrcPos (srcPos), ErrLangId(NULL), ErrMsg (errMsg) { }

		void Show (HWND parent) const
		{
			if (ErrMsg.empty())
				::ErrorDirect (AppendSrcPos (GetString (ErrLangId? ErrLangId : ""), SrcPos).c_str (), parent);
			else
				::ErrorDirect (AppendSrcPos (ErrMsg.c_str(), SrcPos).c_str (), parent);
		}

		const char *SrcPos;
		char *ErrLangId;
		wstring ErrMsg;
	};

	struct ParameterIncorrect : public Exception
	{
		ParameterIncorrect (const char *srcPos) : SrcPos (srcPos) { }

		void Show (HWND parent) const
		{
			string msgBody = "Parameter incorrect.\n\n\n(If you report a bug in connection with this, please include the following technical information in the bug report:\n" + string (SrcPos) + ")";
			MessageBoxA (parent, msgBody.c_str(), "VeraCrypt", MB_ICONERROR | MB_SETFOREGROUND);
		}

		const char *SrcPos;
	};

	struct RandInitFailed : public Exception
	{
		RandInitFailed (const char *srcPos, DWORD dwLastError) : SrcPos (srcPos), LastError (dwLastError) { }

		void Show (HWND parent) const
		{
			char szErrCode[16];
			StringCchPrintfA (szErrCode, ARRAYSIZE(szErrCode), "0x%.8X", LastError);
			string msgBody = "The Random Generator initialization failed.\n\n\n(If you report a bug in connection with this, please include the following technical information in the bug report:\n" + string (SrcPos) + "\nLast Error = " + string (szErrCode) + ")";
			MessageBoxA (parent, msgBody.c_str(), "VeraCrypt", MB_ICONERROR | MB_SETFOREGROUND);
		}

		const char *SrcPos;
		DWORD LastError;
	};

	struct CryptoApiFailed : public Exception
	{
		CryptoApiFailed (const char *srcPos, DWORD dwLastError) : SrcPos (srcPos), LastError (dwLastError) { }

		void Show (HWND parent) const
		{
			char szErrCode[16];
			StringCchPrintfA (szErrCode, ARRAYSIZE(szErrCode), "0x%.8X", LastError);
			string msgBody = "Windows Crypto API failed.\n\n\n(If you report a bug in connection with this, please include the following technical information in the bug report:\n" + string (SrcPos) + "\nLast Error = " + string (szErrCode) + ")";
			MessageBoxA (parent, msgBody.c_str(), "VeraCrypt", MB_ICONERROR | MB_SETFOREGROUND);
		}

		const char *SrcPos;
		DWORD LastError;
	};

	struct TimeOut : public Exception
	{
		TimeOut (const char *srcPos) : SrcPos (srcPos) { }
		void Show (HWND parent) const { ErrorDirect (AppendSrcPos (L"Timeout", SrcPos).c_str (), parent); }

		const char *SrcPos;
	};

	struct UserAbort : public Exception
	{
		UserAbort (const char *srcPos) { }
		void Show (HWND parent) const { }
	};
}

#define throw_sys_if(condition) do { if (condition) throw SystemException( SRC_POS ); } while (false)


#endif // TC_HEADER_Common_Exception