org.apache.commons.compress.archivers.zip

Class PKWareExtraHeader

java.lang.Object

org.apache.commons.compress.archivers.zip.PKWareExtraHeader

All Implemented Interfaces:

ZipExtraField

Direct Known Subclasses:

X0014_X509Certificates, X0015_CertificateIdForFile, X0016_CertificateIdForCentralDirectory, X0017_StrongEncryptionHeader, X0019_EncryptionRecipientCertificateList

public abstract class PKWareExtraHeader
extends java.lang.Object
implements ZipExtraField

Base class for all PKWare strong crypto extra headers.

This base class acts as a marker so you know you can ignore all extra fields that extend this class if you are not interested in the meta data of PKWare strong encryption.

Algorithm IDs - integer identifier of the encryption algorithm from the following range

• 0x6601 - DES
• 0x6602 - RC2 (version needed to extract < 5.2)
• 0x6603 - 3DES 168
• 0x6609 - 3DES 112
• 0x660E - AES 128
• 0x660F - AES 192
• 0x6610 - AES 256
• 0x6702 - RC2 (version needed to extract >= 5.2)
• 0x6720 - Blowfish
• 0x6721 - Twofish
• 0x6801 - RC4
• 0xFFFF - Unknown algorithm

Hash Algorithms - integer identifier of the hash algorithm from the following range

• 0x0000 - none
• 0x0001 - CRC32
• 0x8003 - MD5
• 0x8004 - SHA1
• 0x8007 - RIPEMD160
• 0x800C - SHA256
• 0x800D - SHA384
• 0x800E - SHA512

Since:

1.11

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PKWareExtraHeader.EncryptionAlgorithm Encryption algorithm.
static class	PKWareExtraHeader.HashAlgorithm Hash Algorithm

Field Summary

Fields inherited from interface org.apache.commons.compress.archivers.zip.ZipExtraField

EXTRAFIELD_HEADER_SIZE

Method Summary

Modifier and Type	Method and Description
byte[]	getCentralDirectoryData() Get the central data.
ZipShort	getCentralDirectoryLength() Get the central data length.
ZipShort	getHeaderId() Get the header id.
byte[]	getLocalFileDataData() Get the local data.
ZipShort	getLocalFileDataLength() Get the length of the local data.
void	parseFromCentralDirectoryData(byte[] data, int offset, int length) Populate data from this array as if it was in central directory data.
void	parseFromLocalFileData(byte[] data, int offset, int length) Populate data from this array as if it was in local file data.
void	setCentralDirectoryData(byte[] data) Set the extra field data in central directory.
void	setLocalFileDataData(byte[] data) Set the extra field data in the local file data - without Header-ID or length specifier.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getHeaderId

public ZipShort getHeaderId()

Get the header id.

Specified by:

getHeaderId in interface ZipExtraField

Returns:

the header id

setLocalFileDataData

public void setLocalFileDataData(byte[] data)

Set the extra field data in the local file data - without Header-ID or length specifier.

Parameters:

data - the field data to use

getLocalFileDataLength

public ZipShort getLocalFileDataLength()

Get the length of the local data.

Specified by:

getLocalFileDataLength in interface ZipExtraField

Returns:

the length of the local data

getLocalFileDataData

public byte[] getLocalFileDataData()

Get the local data.

Specified by:

getLocalFileDataData in interface ZipExtraField

Returns:

the local data

setCentralDirectoryData

public void setCentralDirectoryData(byte[] data)

Set the extra field data in central directory.

Parameters:

data - the data to use

getCentralDirectoryLength

public ZipShort getCentralDirectoryLength()

Get the central data length. If there is no central data, get the local file data length.

Specified by:

getCentralDirectoryLength in interface ZipExtraField

Returns:

the central data length

getCentralDirectoryData

public byte[] getCentralDirectoryData()

Get the central data.

Specified by:

getCentralDirectoryData in interface ZipExtraField

Returns:

the central data if present, else return the local file data

parseFromLocalFileData

public void parseFromLocalFileData(byte[] data,
                                   int offset,
                                   int length)

Description copied from interface: ZipExtraField

Populate data from this array as if it was in local file data.

Specified by:

parseFromLocalFileData in interface ZipExtraField

Parameters:

data - the array of bytes.

offset - the source location in the data array.

length - the number of bytes to use in the data array.

See Also:

ZipExtraField.parseFromLocalFileData(byte[], int, int)

parseFromCentralDirectoryData

public void parseFromCentralDirectoryData(byte[] data,
                                          int offset,
                                          int length)

Description copied from interface: ZipExtraField

Populate data from this array as if it was in central directory data.

Specified by:

parseFromCentralDirectoryData in interface ZipExtraField

Parameters:

data - the array of bytes.

offset - the source location in the data array.

length - the number of bytes to use in the data array.

See Also:

ZipExtraField.parseFromCentralDirectoryData(byte[], int, int)