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()	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 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)
            

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.