Package com.itextpdf.kernel.crypto.securityhandler

Class StandardHandlerUsingAesGcm

java.lang.Object

com.itextpdf.kernel.crypto.securityhandler.SecurityHandler

com.itextpdf.kernel.crypto.securityhandler.StandardSecurityHandler

com.itextpdf.kernel.crypto.securityhandler.StandardHandlerUsingAes256

com.itextpdf.kernel.crypto.securityhandler.StandardHandlerUsingAesGcm

       public class StandardHandlerUsingAesGcm extends StandardHandlerUsingAes256
      

Standard security handler with Advanced Encryption Standard-Galois/Counter Mode (AES-GCM) encryption algorithm.

Field Summary

Fields

Modifier and Type	Field	Description
protected int	inObjectNonceCounter
protected byte[]	noncePart

Fields inherited from class com.itextpdf.kernel.crypto.securityhandler.StandardHandlerUsingAes256

encryptMetadata

Fields inherited from class com.itextpdf.kernel.crypto.securityhandler.StandardSecurityHandler

permissions, PERMS_MASK_1_FOR_REVISION_2, PERMS_MASK_1_FOR_REVISION_3_OR_GREATER, PERMS_MASK_2, usedOwnerPassword

Fields inherited from class com.itextpdf.kernel.crypto.securityhandler.SecurityHandler

extra, md5, mkey, nextObjectKey, nextObjectKeySize

Constructor Summary

Constructors

Constructor	Description
StandardHandlerUsingAesGcm(PdfDictionary encryptionDictionary, byte[] password)	Creates new StandardHandlerUsingAesGcm instance for decryption.
StandardHandlerUsingAesGcm(PdfDictionary encryptionDictionary, byte[] userPassword, byte[] ownerPassword, int permissions, boolean encryptMetadata, boolean embeddedFilesOnly)	Creates new StandardHandlerUsingAesGcm instance for encryption.

Method Summary

Modifier and Type	Method	Description
IDecryptor	getDecryptor()	Gets decryptor object.
OutputStreamEncryption	getEncryptionStream(OutputStream os)	Gets a stream wrapper, responsible for encryption.
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 com.itextpdf.kernel.crypto.securityhandler.StandardHandlerUsingAes256

isEncryptMetadata, setPermissions

Methods inherited from class com.itextpdf.kernel.crypto.securityhandler.StandardSecurityHandler

equalsArray, generateOwnerPasswordIfNullOrEmpty, getIsoBytes, getPermissions, isUsedOwnerPassword, setStandardHandlerDicEntries

Methods inherited from class com.itextpdf.kernel.crypto.securityhandler.SecurityHandler

getMkey, getNextObjectKey

Methods inherited from class java.lang.Object

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

Field Details

noncePart

             protected byte[] noncePart
            

inObjectNonceCounter

             protected int inObjectNonceCounter
            

Constructor Details

StandardHandlerUsingAesGcm

             public StandardHandlerUsingAesGcm
             (PdfDictionary encryptionDictionary, byte[] userPassword, byte[] ownerPassword, int permissions, boolean encryptMetadata, boolean embeddedFilesOnly)
            

Creates new StandardHandlerUsingAesGcm instance for encryption.

Parameters:

encryptionDictionary - document's encryption dictionary

userPassword - user password

ownerPassword - owner password

permissions - access permissions

encryptMetadata - indicates whether the document-level metadata stream shall be encrypted

embeddedFilesOnly - indicates whether embedded files shall be encrypted in an otherwise unencrypted document

StandardHandlerUsingAesGcm

             public StandardHandlerUsingAesGcm
             (PdfDictionary encryptionDictionary, byte[] password)
            

Creates new StandardHandlerUsingAesGcm instance for decryption.

Parameters:

encryptionDictionary - document's encryption dictionary

password - owner or user password to decrypt the document

Method Details

setHashKeyForNextObject

             public void setHashKeyForNextObject
             (int objNumber, int objGeneration)
            

Description copied from class: SecurityHandler

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

Overrides:

setHashKeyForNextObject in class StandardHandlerUsingAes256

Parameters:

objNumber - number of particular object for encryption

objGeneration - generation of particular object for encryption

getEncryptionStream

             public OutputStreamEncryption getEncryptionStream
             (OutputStream os)
            

Description copied from class: SecurityHandler

Gets a stream wrapper, responsible for encryption.

Overrides:

getEncryptionStream in class StandardHandlerUsingAes256

Parameters:

os - OutputStream to be wrapped

Returns:

OutputStreamEncryption, responsible for encryption.

getDecryptor

             public IDecryptor getDecryptor()
            

Description copied from class: SecurityHandler

Gets decryptor object.

Overrides:

getDecryptor in class StandardHandlerUsingAes256

Returns:

IDecryptor

initMd5MessageDigest

             protected void initMd5MessageDigest()
            

Init md5 message digest.

Overrides:

initMd5MessageDigest in class StandardHandlerUsingAes256