com.lowagie.text.pdf
Class PdfEncryption

java.lang.Object
  com.lowagie.text.pdf.PdfEncryption

public class PdfEncryption
extends Object

Author:

Paulo Soares (psoares@consiste.pt), Kazuya Ujihara

Field Summary

static int	AES_128
private ARCFOUREncryption	arcfour
private int	cryptoMode
(package private) byte[]	documentID
private boolean	embeddedFilesOnly Indicates if the encryption is only necessary for embedded files.
private boolean	encryptMetadata
(package private) byte[]	extra Work area to prepare the object/generation bytes
(package private) byte[]	key The encryption key for a particular object/generation
private int	keyLength The generic key length.
(package private) int	keySize The encryption key length for a particular object/generation
(package private) MessageDigest	md5 The message digest algorithm MD5
private static byte[]	metadataPad
(package private) byte[]	mkey The global encryption key
(package private) byte[]	ownerKey The encryption key for the owner
private static byte[]	pad
(package private) int	permissions
protected PdfPublicKeySecurityHandler	publicKeyHandler The public key security handler for certificate encryption
private int	revision
private static byte[]	salt
(package private) static long	seq
static int	STANDARD_ENCRYPTION_128
static int	STANDARD_ENCRYPTION_40
(package private) byte[]	userKey The encryption key for the user

Constructor Summary

PdfEncryption()

PdfEncryption(PdfEncryption enc)

Method Summary

void	addRecipient(Certificate cert, int permission)
int	calculateStreamSize(int n)
private byte[]	computeOwnerKey(byte[] userPad, byte[] ownerPad)
byte[]	computeUserPassword(byte[] ownerPassword)
static byte[]	createDocumentId()
static PdfObject	createInfoId(byte[] id)
byte[]	decryptByteArray(byte[] b)
byte[]	encryptByteArray(byte[] b)
int	getCryptoMode()
StandardDecryption	getDecryptor()
PdfDictionary	getEncryptionDictionary()
OutputStreamEncryption	getEncryptionStream(OutputStream os)
PdfObject	getFileID()
boolean	isEmbeddedFilesOnly() Indicates if only the embedded files have to be encrypted.
boolean	isMetadataEncrypted()
private byte[]	padPassword(byte[] userPassword)
void	setCryptoMode(int mode, int kl)
void	setHashKey(int number, int generation)
void	setupAllKeys(byte[] userPassword, byte[] ownerPassword, int permissions)
void	setupByEncryptionKey(byte[] key, int keylength)
private void	setupByOwnerPad(byte[] documentID, byte[] ownerPad, byte[] userKey, byte[] ownerKey, int permissions)
void	setupByOwnerPassword(byte[] documentID, byte[] ownerPassword, byte[] userKey, byte[] ownerKey, int permissions)
private void	setupByUserPad(byte[] documentID, byte[] userPad, byte[] ownerKey, int permissions)
void	setupByUserPassword(byte[] documentID, byte[] userPassword, byte[] ownerKey, int permissions)
private void	setupGlobalEncryptionKey(byte[] documentID, byte[] userPad, byte[] ownerKey, int permissions) ownerKey, documentID must be setup
private void	setupUserKey() mkey must be setup

Methods inherited from class java.lang.Object

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

Field Detail

STANDARD_ENCRYPTION_40

public static final int STANDARD_ENCRYPTION_40

See Also:

Constant Field Values

STANDARD_ENCRYPTION_128

public static final int STANDARD_ENCRYPTION_128

See Also:

Constant Field Values

AES_128

public static final int AES_128

See Also:

Constant Field Values

pad

private static final byte[] pad

salt

private static final byte[] salt

metadataPad

private static final byte[] metadataPad

key

byte[] key

The encryption key for a particular object/generation

keySize

int keySize

The encryption key length for a particular object/generation

mkey

byte[] mkey

The global encryption key

extra

byte[] extra

Work area to prepare the object/generation bytes

md5

MessageDigest md5

The message digest algorithm MD5

ownerKey

byte[] ownerKey

The encryption key for the owner

userKey

byte[] userKey

The encryption key for the user

publicKeyHandler

protected PdfPublicKeySecurityHandler publicKeyHandler

The public key security handler for certificate encryption

permissions

int permissions

documentID

byte[] documentID

seq

static long seq

revision

private int revision

arcfour

private ARCFOUREncryption arcfour

keyLength

private int keyLength

The generic key length. It may be 40 or 128.

encryptMetadata

private boolean encryptMetadata

embeddedFilesOnly

private boolean embeddedFilesOnly

Indicates if the encryption is only necessary for embedded files.

Since:

2.1.3

cryptoMode

private int cryptoMode

Constructor Detail

PdfEncryption

public PdfEncryption()

PdfEncryption

public PdfEncryption(PdfEncryption enc)

Method Detail

setCryptoMode

public void setCryptoMode(int mode,
                          int kl)

getCryptoMode

public int getCryptoMode()

isMetadataEncrypted

public boolean isMetadataEncrypted()

isEmbeddedFilesOnly

public boolean isEmbeddedFilesOnly()

Indicates if only the embedded files have to be encrypted.

Returns:

if true only the embedded files will be encrypted

Since:

2.1.3

padPassword

private byte[] padPassword(byte[] userPassword)

computeOwnerKey

private byte[] computeOwnerKey(byte[] userPad,
                               byte[] ownerPad)

setupGlobalEncryptionKey

private void setupGlobalEncryptionKey(byte[] documentID,
                                      byte[] userPad,
                                      byte[] ownerKey,
                                      int permissions)

ownerKey, documentID must be setup

setupUserKey

private void setupUserKey()

mkey must be setup

setupAllKeys

public void setupAllKeys(byte[] userPassword,
                         byte[] ownerPassword,
                         int permissions)

createDocumentId

public static byte[] createDocumentId()

setupByUserPassword

public void setupByUserPassword(byte[] documentID,
                                byte[] userPassword,
                                byte[] ownerKey,
                                int permissions)

setupByUserPad

private void setupByUserPad(byte[] documentID,
                            byte[] userPad,
                            byte[] ownerKey,
                            int permissions)

setupByOwnerPassword

public void setupByOwnerPassword(byte[] documentID,
                                 byte[] ownerPassword,
                                 byte[] userKey,
                                 byte[] ownerKey,
                                 int permissions)

setupByOwnerPad

private void setupByOwnerPad(byte[] documentID,
                             byte[] ownerPad,
                             byte[] userKey,
                             byte[] ownerKey,
                             int permissions)

setupByEncryptionKey

public void setupByEncryptionKey(byte[] key,
                                 int keylength)

setHashKey

public void setHashKey(int number,
                       int generation)

createInfoId

public static PdfObject createInfoId(byte[] id)

getEncryptionDictionary

public PdfDictionary getEncryptionDictionary()

getFileID

public PdfObject getFileID()

getEncryptionStream

public OutputStreamEncryption getEncryptionStream(OutputStream os)

calculateStreamSize

public int calculateStreamSize(int n)

encryptByteArray

public byte[] encryptByteArray(byte[] b)

getDecryptor

public StandardDecryption getDecryptor()

decryptByteArray

public byte[] decryptByteArray(byte[] b)

addRecipient

public void addRecipient(Certificate cert,
                         int permission)

computeUserPassword

public byte[] computeUserPassword(byte[] ownerPassword)