#include <ZipCryptograph.h>

Inheritance diagram for CZipCryptograph:

Public Types
enum	EncryptionMethod { encStandard, encWinZipAes128, encWinZipAes192, encWinZipAes256, encNone = 0xFF }

Public Member Functions
virtual bool	CanHandle (int iEncryptionMethod)

virtual void	Decode (char *pBuffer, DWORD uSize)=0

virtual void	Encode (char *pBuffer, DWORD uSize)=0

virtual void	FinishDecode (CZipFileHeader &currentFile, CZipStorage &storage)

virtual void	FinishEncode (CZipFileHeader &currentFile, CZipStorage &storage)

virtual bool	InitDecode (CZipAutoBuffer &password, CZipFileHeader &currentFile, CZipStorage &storage, bool ignoreCheck)=0

virtual void	InitEncode (CZipAutoBuffer &password, CZipFileHeader &currentFile, CZipStorage &storage)=0

Static Public Member Functions
static CZipCryptograph *	CreateCryptograph (int iEncryptionMethod)

static DWORD	GetEncryptedInfoSize (int iEncryptionMethod)

static DWORD	GetEncryptedInfoSizeAfterData (int iEncryptionMethod)

static DWORD	GetEncryptedInfoSizeBeforeData (int iEncryptionMethod)

static bool	IsEncryptionSupported (int iEncryptionMethod)

static bool	IsWinZipAesEncryption (int iEncryptionMethod)

Detailed Description

The base class for cryptographs used in encryption and decryption of file data.

See Also: Encryption Methods: How to Best Protect Your Data

Member Enumeration Documentation

enum CZipCryptograph::EncryptionMethod

The encryption method.

See Also: Encryption Methods: How to Best Protect Your Data

Enumerator:

encStandard	The traditional zip encryption.
encWinZipAes128	WinZip AES 128-bit encryption.
encWinZipAes192	WinZip AES 192-bit encryption.
encWinZipAes256	WinZip AES 256-bit encryption.
encNone	Indicates no encryption.

Member Function Documentation

virtual bool CZipCryptograph::CanHandle ( int iEncryptionMethod )

inlinevirtual

Returns the value indicating whether the current compressor can handle the given encryption method.

Parameters

iEncryptionMethod The encryption method to test. It can be one of the EncryptionMethod values.

Returns: true, if the current compressor can handle the given encryption method; false otherwise.

Reimplemented in CZipCrc32Cryptograph.

static CZipCryptograph* CZipCryptograph::CreateCryptograph ( int iEncryptionMethod )

static

A factory method that creates an appropriate cryptograph for the given method.

Parameters

iEncryptionMethod The encryption method to create a cryptograph for. It can be one of the EncryptionMethod values.

Returns: The new cryptograph. The caller is responsible for destroying the object. If the method is not supported, creates CZipCrc32Cryptograph.

virtual void CZipCryptograph::Decode	(	char *	pBuffer,
		DWORD	uSize
	)

pure virtual

Decodes the given data.

Parameters

pBuffer	The buffer that holds the data to decode and that receives the results.
uSize	The size of pBuffer.

Implemented in CZipCrc32Cryptograph.

virtual void CZipCryptograph::Encode	(	char *	pBuffer,
		DWORD	uSize
	)

pure virtual

Encodes the given data.

Parameters

pBuffer	The buffer that holds the data to encode and that receives the results.
uSize	The size of pBuffer.

Implemented in CZipCrc32Cryptograph.

virtual void CZipCryptograph::FinishDecode	(	CZipFileHeader &	currentFile,
		CZipStorage &	storage
	)

inlinevirtual

The method called at the end of the decoding process.

Parameters

currentFile	The file being decoded and extracted.
storage	The current CZipStorage.

virtual void CZipCryptograph::FinishEncode	(	CZipFileHeader &	currentFile,
		CZipStorage &	storage
	)

inlinevirtual

The method called at the end of the decoding process.

Parameters

currentFile	The file being compressed and encoded.
storage	The current CZipStorage.

static DWORD CZipCryptograph::GetEncryptedInfoSize ( int iEncryptionMethod )

static

Returns the total size of the extra data that is added to the compression stream during encryption with the given method.

Parameters

iEncryptionMethod The encryption method. It can be one of the EncryptionMethod values.

Returns: The total size of extra data for the given encryption method.

static DWORD CZipCryptograph::GetEncryptedInfoSizeAfterData ( int iEncryptionMethod )

static

Returns the size of the extra data that is added after the compression stream during encryption with the given method.

Parameters

iEncryptionMethod The encryption method. It can be one of the EncryptionMethod values.

Returns: The size of extra data at the end of the compression stream for the given encryption method.

static DWORD CZipCryptograph::GetEncryptedInfoSizeBeforeData ( int iEncryptionMethod )

static

Returns the size of the extra data that is added before the compression stream during encryption with the given method.

Parameters

iEncryptionMethod The encryption method. It can be one of the EncryptionMethod values.

Returns: The size of extra data at the beginning of the compression stream for the given encryption method.

virtual bool CZipCryptograph::InitDecode	(	CZipAutoBuffer &	password,
		CZipFileHeader &	currentFile,
		CZipStorage &	storage,
		bool	ignoreCheck
	)

pure virtual

The method called when an existing file is opened for extraction.

Parameters

password	The supplied password with the CZipArchive::SetPassword method.
currentFile	The file being decoded and extracted.
storage	The current CZipStorage.
ignoreCheck	If `true`, skips control bytes verifications.

Returns: true, if the password is initially considered correct; false otherwise.

Implemented in CZipCrc32Cryptograph.

virtual void CZipCryptograph::InitEncode	(	CZipAutoBuffer &	password,
		CZipFileHeader &	currentFile,
		CZipStorage &	storage
	)

pure virtual

The method called when a new file is opened for compression.

Parameters

password	The supplied password with the CZipArchive::SetPassword method.
currentFile	The file being compressed and encoded.
storage	The current CZipStorage.

Implemented in CZipCrc32Cryptograph.

static bool CZipCryptograph::IsEncryptionSupported ( int iEncryptionMethod )

inlinestatic

Returns the value indicating whether the given encryption method is supported by the current compilation of the ZipArchive Library.

Parameters

iEncryptionMethod The encryption method to test. It can be one of the EncryptionMethod values.

Returns: true, if the method is supported; false otherwise.

static bool CZipCryptograph::IsWinZipAesEncryption ( int iEncryptionMethod )

inlinestatic

Returns the value indicating whether the given method is one of the WinZip AES encryption methods.

Parameters

iEncryptionMethod The encryption method to test. It can be one of the EncryptionMethod values.

Returns: true, if the method is one the WinZip AES encryption methods; false otherwise.

The documentation for this class was generated from the following file:

ZipCryptograph.h

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

Member Enumeration Documentation

Member Function Documentation