com.itextpdf.kernel.crypto.securityhandler

Class SecurityHandler

java.lang.Object

com.itextpdf.kernel.crypto.securityhandler.SecurityHandler

Direct Known Subclasses:

PubKeySecurityHandler, StandardSecurityHandler

public abstract class SecurityHandler
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
protected byte[]	extra Work area to prepare the object/generation bytes
protected MessageDigest	md5
protected byte[]	mkey The global encryption key
protected byte[]	nextObjectKey The encryption key for a particular object/generation.
protected int	nextObjectKeySize The encryption key length for a particular object/generation It is recalculated with setHashKeyForNextObject(int, int) for every object individually based in its object/generation.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SecurityHandler()

Method Summary

Modifier and Type	Method and Description
abstract IDecryptor	getDecryptor() Gets decryptor object.
abstract OutputStreamEncryption	getEncryptionStream(OutputStream os) Gets a stream wrapper, responsible for encryption.
byte[]	getMkey() Gets global encryption key.
byte[]	getNextObjectKey() Gets encryption key for a particular object/generation.
void	setHashKeyForNextObject(int objNumber, int objGeneration) Note: For most of the supported security handlers algorithm to calculate encryption key for particular object is the same.

Methods inherited from class java.lang.Object

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

Field Detail

mkey

protected byte[] mkey

The global encryption key

nextObjectKey

protected byte[] nextObjectKey

The encryption key for a particular object/generation. It is recalculated with setHashKeyForNextObject(int, int) for every object individually based in its object/generation.

nextObjectKeySize

protected int nextObjectKeySize

The encryption key length for a particular object/generation It is recalculated with setHashKeyForNextObject(int, int) for every object individually based in its object/generation.

md5

protected MessageDigest md5

extra

protected byte[] extra

Work area to prepare the object/generation bytes

Constructor Detail

SecurityHandler

protected SecurityHandler()

Method Detail

setHashKeyForNextObject

public void setHashKeyForNextObject(int objNumber,
                                    int objGeneration)

Note: For most of the supported security handlers algorithm to calculate encryption key for particular object is the same.

Parameters:

objNumber - number of particular object for encryption

objGeneration - generation of particular object for encryption

getEncryptionStream

public abstract OutputStreamEncryption getEncryptionStream(OutputStream os)

Gets a stream wrapper, responsible for encryption.

Parameters:

os - OutputStream to be wrapped

Returns:

OutputStreamEncryption, responsible for encryption.

getDecryptor

public abstract IDecryptor getDecryptor()

Gets decryptor object.

Returns:

IDecryptor

getNextObjectKey

public byte[] getNextObjectKey()

Gets encryption key for a particular object/generation.

Returns:

encryption key for a particular object/generation.

getMkey

public byte[] getMkey()

Gets global encryption key.

Returns:

global encryption key.