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 Object 
      

Field Summary

Fields

Modifier and Type	Field	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	Description
protected	SecurityHandler()

Method Summary

Modifier and Type	Method	Description
abstract IDecryptor	getDecryptor()
abstract OutputStreamEncryption	getEncryptionStream(OutputStream os)
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 Details

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 Details

SecurityHandler

 protected SecurityHandler() 
            

Method Details

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) 
            

getDecryptor

 public abstract IDecryptor getDecryptor()