Class StandardHandlerUsingAes256

java.lang.Object

com.itextpdf.kernel.crypto.securityhandler.SecurityHandler

com.itextpdf.kernel.crypto.securityhandler.StandardSecurityHandler

com.itextpdf.kernel.crypto.securityhandler.StandardHandlerUsingAes256

Direct Known Subclasses:

StandardHandlerUsingAesGcm

public class StandardHandlerUsingAes256
extends StandardSecurityHandler

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	encryptMetadata
private boolean	isPdf2
private static final int	KEY_SALT_OFFSET
private static final int	SALT_LENGTH
private static final int	VALIDATION_SALT_OFFSET

Fields inherited from class StandardSecurityHandler

permissions, PERMS_MASK_1_FOR_REVISION_2, PERMS_MASK_1_FOR_REVISION_3_OR_GREATER, PERMS_MASK_2, usedOwnerPassword

Fields inherited from class SecurityHandler

extra, md5, mkey, nextObjectKey, nextObjectKeySize

Constructor Summary

Constructors

Constructor	Description
StandardHandlerUsingAes256(PdfDictionary encryptionDictionary, byte[] password)
StandardHandlerUsingAes256(PdfDictionary encryptionDictionary, byte[] userPassword, byte[] ownerPassword, int permissions, boolean encryptMetadata, boolean embeddedFilesOnly, PdfVersion version)

Method Summary

Modifier and Type	Method	Description
private byte[]	computeHash(byte[] password, byte[] salt, int saltOffset, int saltLen)
private byte[]	computeHash(byte[] password, byte[] salt, int saltOffset, int saltLen, byte[] userKey)
private byte[]	getAes256Perms(int permissions, boolean encryptMetadata)
IDecryptor	getDecryptor()	Gets decryptor object.
OutputStreamEncryption	getEncryptionStream(OutputStream os)	Gets a stream wrapper, responsible for encryption.
private void	initKeyAndFillDictionary(PdfDictionary encryptionDictionary, byte[] userPassword, byte[] ownerPassword, int permissions, boolean encryptMetadata, boolean embeddedFilesOnly)
private void	initKeyAndReadDictionary(PdfDictionary encryptionDictionary, byte[] password)
protected void	initMd5MessageDigest()	Init md5 message digest.
boolean	isEncryptMetadata()	Checks whether the document-level metadata stream will be encrypted.
(package private) boolean	isPdf2(PdfDictionary encryptionDictionary)
(package private) void	setAES256DicEntries(PdfDictionary encryptionDictionary, byte[] oeKey, byte[] ueKey, byte[] aes256Perms, boolean encryptMetadata, boolean embeddedFilesOnly)
(package private) void	setEncryptionDictionaryEntries(PdfDictionary encryptionDictionary, byte[] oeKey, byte[] ueKey, byte[] aes256Perms, boolean encryptMetadata, boolean embeddedFilesOnly, int version, int revision, PdfName cryptoFilter)
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.
void	setPermissions(int permissions, PdfDictionary encryptionDictionary)	Updates encryption dictionary with the security permissions provided.
private byte[]	truncateArray(byte[] array)

Methods inherited from class StandardSecurityHandler

equalsArray, generateOwnerPasswordIfNullOrEmpty, getIsoBytes, getPermissions, isUsedOwnerPassword, setStandardHandlerDicEntries

Methods inherited from class SecurityHandler

getMkey, getNextObjectKey

Methods inherited from class Object

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

Field Details

VALIDATION_SALT_OFFSET

private static final int VALIDATION_SALT_OFFSET

See Also:

• Constant Field Values

KEY_SALT_OFFSET

private static final int KEY_SALT_OFFSET

See Also:

• Constant Field Values

SALT_LENGTH

private static final int SALT_LENGTH

See Also:

• Constant Field Values

encryptMetadata

protected boolean encryptMetadata

isPdf2

private boolean isPdf2

Constructor Details

StandardHandlerUsingAes256

public StandardHandlerUsingAes256(PdfDictionary encryptionDictionary,
 byte[] userPassword,
 byte[] ownerPassword,
 int permissions,
 boolean encryptMetadata,
 boolean embeddedFilesOnly,
 PdfVersion version)

StandardHandlerUsingAes256

public StandardHandlerUsingAes256(PdfDictionary encryptionDictionary,
 byte[] password)

Method Details

isEncryptMetadata

public boolean isEncryptMetadata()

Checks whether the document-level metadata stream will be encrypted.

Returns:

true if the document-level metadata stream shall be encrypted, false otherwise

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 SecurityHandler

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.

Specified by:

getEncryptionStream in class SecurityHandler

Parameters:

os - OutputStream to be wrapped

Returns:

OutputStreamEncryption, responsible for encryption.

getDecryptor

public IDecryptor getDecryptor()

Description copied from class: SecurityHandler

Gets decryptor object.

Specified by:

getDecryptor in class SecurityHandler

Returns:

IDecryptor

setPermissions

public void setPermissions(int permissions,
 PdfDictionary encryptionDictionary)

Updates encryption dictionary with the security permissions provided.

Overrides:

setPermissions in class StandardSecurityHandler

Parameters:

permissions - new permissions to set

encryptionDictionary - encryption dictionary to update

setAES256DicEntries

void setAES256DicEntries(PdfDictionary encryptionDictionary,
 byte[] oeKey,
 byte[] ueKey,
 byte[] aes256Perms,
 boolean encryptMetadata,
 boolean embeddedFilesOnly)

setEncryptionDictionaryEntries

void setEncryptionDictionaryEntries(PdfDictionary encryptionDictionary,
 byte[] oeKey,
 byte[] ueKey,
 byte[] aes256Perms,
 boolean encryptMetadata,
 boolean embeddedFilesOnly,
 int version,
 int revision,
 PdfName cryptoFilter)

isPdf2

boolean isPdf2(PdfDictionary encryptionDictionary)

initMd5MessageDigest

protected void initMd5MessageDigest()

Init md5 message digest.

Overrides:

initMd5MessageDigest in class SecurityHandler

initKeyAndFillDictionary

private void initKeyAndFillDictionary(PdfDictionary encryptionDictionary,
 byte[] userPassword,
 byte[] ownerPassword,
 int permissions,
 boolean encryptMetadata,
 boolean embeddedFilesOnly)

getAes256Perms

private byte[] getAes256Perms(int permissions,
 boolean encryptMetadata)

initKeyAndReadDictionary

private void initKeyAndReadDictionary(PdfDictionary encryptionDictionary,
 byte[] password)

computeHash

private byte[] computeHash(byte[] password,
 byte[] salt,
 int saltOffset,
 int saltLen)
                    throws NoSuchAlgorithmException

Throws:

NoSuchAlgorithmException

computeHash

private byte[] computeHash(byte[] password,
 byte[] salt,
 int saltOffset,
 int saltLen,
 byte[] userKey)
                    throws NoSuchAlgorithmException

Throws:

NoSuchAlgorithmException

truncateArray

private byte[] truncateArray(byte[] array)