org.apache.pdfbox.pdmodel.encryption
Class StandardSecurityHandler

java.lang.Object
  org.apache.pdfbox.pdmodel.encryption.SecurityHandler
      org.apache.pdfbox.pdmodel.encryption.StandardSecurityHandler

public class StandardSecurityHandler
extends SecurityHandler

The class implements the standard security handler as decribed in the PDF specifications. This security handler protects document with password.

Version:

$Revision: 1.5 $

Author:

Ben Litchfield, Benoit Guillon ([email protected])

See Also:

to see how to protect document with this security handler.

Field Summary

static byte[]	ENCRYPT_PADDING Standard padding for encryption.
static String	FILTER Type of security handler.
static Class	PROTECTION_POLICY_CLASS Protection policy class for this handler.

Fields inherited from class org.apache.pdfbox.pdmodel.encryption.SecurityHandler

currentAccessPermission, document, encryptionKey, keyLength, version

Constructor Summary

StandardSecurityHandler()
Constructor.

StandardSecurityHandler(StandardProtectionPolicy p)
Constructor used for encryption.

Method Summary

byte[]	computeEncryptedKey(byte[] password, byte[] o, int permissions, byte[] id, int encRevision, int length, boolean encryptMetadata) Compute the encryption key.
byte[]	computeOwnerPassword(byte[] ownerPassword, byte[] userPassword, int encRevision, int length) Compute the owner entry in the encryption dictionary.
byte[]	computeUserPassword(byte[] password, byte[] o, int permissions, byte[] id, int encRevision, int length, boolean encryptMetadata) This will compute the user password hash.
void	decryptDocument(PDDocument doc, DecryptionMaterial decryptionMaterial) Decrypt the document.
byte[]	getUserPassword(byte[] ownerPassword, byte[] o, int encRevision, long length) Get the user password based on the owner password.
boolean	isOwnerPassword(byte[] ownerPassword, byte[] u, byte[] o, int permissions, byte[] id, int encRevision, int length, boolean encryptMetadata) Check for owner password.
boolean	isOwnerPassword(String password, byte[] u, byte[] o, int permissions, byte[] id, int encRevision, int length, boolean encryptMetadata) Check for owner password.
boolean	isUserPassword(byte[] password, byte[] u, byte[] o, int permissions, byte[] id, int encRevision, int length, boolean encryptMetadata) Check if a plaintext password is the user password.
boolean	isUserPassword(String password, byte[] u, byte[] o, int permissions, byte[] id, int encRevision, int length, boolean encryptMetadata) Check if a plaintext password is the user password.
void	prepareDocumentForEncryption(PDDocument doc) Prepare document for encryption.
void	prepareForDecryption(PDEncryptionDictionary encDictionary, COSArray documentIDArray, DecryptionMaterial decryptionMaterial) Prepares everything to decrypt the document.

Methods inherited from class org.apache.pdfbox.pdmodel.encryption.SecurityHandler

decryptStream, decryptString, encryptData, encryptData, encryptStream, getCurrentAccessPermission, getKeyLength, isAES, proceedDecryption, setAES, setKeyLength

Methods inherited from class java.lang.Object

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

Field Detail

FILTER

public static final String FILTER

Type of security handler.

See Also:

Constant Field Values

PROTECTION_POLICY_CLASS

public static final Class PROTECTION_POLICY_CLASS

Protection policy class for this handler.

ENCRYPT_PADDING

public static final byte[] ENCRYPT_PADDING

Standard padding for encryption.

Constructor Detail

StandardSecurityHandler

public StandardSecurityHandler()

Constructor.

StandardSecurityHandler

public StandardSecurityHandler(StandardProtectionPolicy p)

Constructor used for encryption.

Parameters:

p - The protection policy.

Method Detail

decryptDocument

public void decryptDocument(PDDocument doc,
                            DecryptionMaterial decryptionMaterial)
                     throws CryptographyException,
                            IOException

Decrypt the document.

Specified by:

decryptDocument in class SecurityHandler

Parameters:

doc - The document to be decrypted.

decryptionMaterial - Information used to decrypt the document.

Throws:

IOException - If there is an error accessing data.

CryptographyException - If there is an error with decryption.

prepareForDecryption

public void prepareForDecryption(PDEncryptionDictionary encDictionary,
                                 COSArray documentIDArray,
                                 DecryptionMaterial decryptionMaterial)
                          throws CryptographyException,
                                 IOException

Prepares everything to decrypt the document. If decryptDocument(PDDocument, DecryptionMaterial) is used, this method is called from there. Only if decryption of single objects is needed this should be called instead.

Specified by:

prepareForDecryption in class SecurityHandler

Parameters:

encDictionary - encryption dictionary, can be retrieved via PDDocument.getEncryptionDictionary()

documentIDArray - document id which is returned via COSDocument#getDocumentID()

decryptionMaterial - Information used to decrypt the document.

Throws:

IOException - If there is an error accessing data.

CryptographyException - If there is an error with decryption.

prepareDocumentForEncryption

public void prepareDocumentForEncryption(PDDocument doc)
                                  throws CryptographyException,
                                         IOException

Prepare document for encryption.

Specified by:

prepareDocumentForEncryption in class SecurityHandler

Parameters:

doc - The documeent to encrypt.

Throws:

IOException - If there is an error accessing data.

CryptographyException - If there is an error with decryption.

isOwnerPassword

public final boolean isOwnerPassword(byte[] ownerPassword,
                                     byte[] u,
                                     byte[] o,
                                     int permissions,
                                     byte[] id,
                                     int encRevision,
                                     int length,
                                     boolean encryptMetadata)
                              throws CryptographyException,
                                     IOException

Check for owner password.

Parameters:

ownerPassword - The owner password.

u - The u entry of the encryption dictionary.

o - The o entry of the encryption dictionary.

permissions - The set of permissions on the document.

id - The document id.

encRevision - The encryption algorithm revision.

length - The encryption key length.

Returns:

True If the ownerPassword param is the owner password.

Throws:

CryptographyException - If there is an error during encryption.

IOException - If there is an error accessing data.

getUserPassword

public final byte[] getUserPassword(byte[] ownerPassword,
                                    byte[] o,
                                    int encRevision,
                                    long length)
                             throws CryptographyException,
                                    IOException

Get the user password based on the owner password.

Parameters:

ownerPassword - The plaintext owner password.

o - The o entry of the encryption dictionary.

encRevision - The encryption revision number.

length - The key length.

Returns:

The u entry of the encryption dictionary.

Throws:

CryptographyException - If there is an error generating the user password.

IOException - If there is an error accessing data while generating the user password.

computeEncryptedKey

public final byte[] computeEncryptedKey(byte[] password,
                                        byte[] o,
                                        int permissions,
                                        byte[] id,
                                        int encRevision,
                                        int length,
                                        boolean encryptMetadata)
                                 throws CryptographyException

Compute the encryption key.

Parameters:

password - The password to compute the encrypted key.

o - The o entry of the encryption dictionary.

permissions - The permissions for the document.

id - The document id.

encRevision - The revision of the encryption algorithm.

length - The length of the encryption key.

Returns:

The encrypted key bytes.

Throws:

CryptographyException - If there is an error with encryption.

computeUserPassword

public final byte[] computeUserPassword(byte[] password,
                                        byte[] o,
                                        int permissions,
                                        byte[] id,
                                        int encRevision,
                                        int length,
                                        boolean encryptMetadata)
                                 throws CryptographyException,
                                        IOException

This will compute the user password hash.

Parameters:

password - The plain text password.

o - The owner password hash.

permissions - The document permissions.

id - The document id.

encRevision - The revision of the encryption.

length - The length of the encryption key.

Returns:

The user password.

Throws:

CryptographyException - If there is an error computing the user password.

IOException - If there is an IO error.

computeOwnerPassword

public final byte[] computeOwnerPassword(byte[] ownerPassword,
                                         byte[] userPassword,
                                         int encRevision,
                                         int length)
                                  throws CryptographyException,
                                         IOException

Compute the owner entry in the encryption dictionary.

Parameters:

ownerPassword - The plaintext owner password.

userPassword - The plaintext user password.

encRevision - The revision number of the encryption algorithm.

length - The length of the encryption key.

Returns:

The o entry of the encryption dictionary.

Throws:

CryptographyException - If there is an error with encryption.

IOException - If there is an error accessing data.

isUserPassword

public final boolean isUserPassword(byte[] password,
                                    byte[] u,
                                    byte[] o,
                                    int permissions,
                                    byte[] id,
                                    int encRevision,
                                    int length,
                                    boolean encryptMetadata)
                             throws CryptographyException,
                                    IOException

Check if a plaintext password is the user password.

Parameters:

password - The plaintext password.

u - The u entry of the encryption dictionary.

o - The o entry of the encryption dictionary.

permissions - The permissions set in the the PDF.

id - The document id used for encryption.

encRevision - The revision of the encryption algorithm.

length - The length of the encryption key.

Returns:

true If the plaintext password is the user password.

Throws:

CryptographyException - If there is an error during encryption.

IOException - If there is an error accessing data.

isUserPassword

public final boolean isUserPassword(String password,
                                    byte[] u,
                                    byte[] o,
                                    int permissions,
                                    byte[] id,
                                    int encRevision,
                                    int length,
                                    boolean encryptMetadata)
                             throws CryptographyException,
                                    IOException

Check if a plaintext password is the user password.

Parameters:

password - The plaintext password.

u - The u entry of the encryption dictionary.

o - The o entry of the encryption dictionary.

permissions - The permissions set in the the PDF.

id - The document id used for encryption.

encRevision - The revision of the encryption algorithm.

length - The length of the encryption key.

Returns:

true If the plaintext password is the user password.

Throws:

CryptographyException - If there is an error during encryption.

IOException - If there is an error accessing data.

isOwnerPassword

public final boolean isOwnerPassword(String password,
                                     byte[] u,
                                     byte[] o,
                                     int permissions,
                                     byte[] id,
                                     int encRevision,
                                     int length,
                                     boolean encryptMetadata)
                              throws CryptographyException,
                                     IOException

Check for owner password.

Parameters:

password - The owner password.

u - The u entry of the encryption dictionary.

o - The o entry of the encryption dictionary.

permissions - The set of permissions on the document.

id - The document id.

encRevision - The encryption algorithm revision.

length - The encryption key length.

Returns:

True If the ownerPassword param is the owner password.

Throws:

CryptographyException - If there is an error during encryption.

IOException - If there is an error accessing data.