Package 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 java.lang.Object

Field Summary

Fields

Modifier and Type	Field	Description
protected byte[]	extra	Work area to prepare the object/generation bytes
private static IBouncyCastleFactory	FACTORY
private static org.slf4j.Logger	LOGGER
protected java.security.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	Description
protected	SecurityHandler()

Method Summary

Modifier and Type	Method	Description
abstract IDecryptor	getDecryptor()	Gets decryptor object.
abstract OutputStreamEncryption	getEncryptionStream(java.io.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.
protected void	initMd5MessageDigest()	Init md5 message digest.
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

FACTORY

private static final IBouncyCastleFactory FACTORY

LOGGER

private static final org.slf4j.Logger LOGGER

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 java.security.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(java.io.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.

initMd5MessageDigest

protected void initMd5MessageDigest()

Init md5 message digest.