org.verapdf.tools

Class EncryptionToolsRevision5_6

java.lang.Object

org.verapdf.tools.EncryptionToolsRevision5_6

public class EncryptionToolsRevision5_6
extends Object

Author:

Sergey Shemyakov

Constructor Summary

Constructors

Constructor and Description
EncryptionToolsRevision5_6()

Method Summary

Modifier and Type	Method and Description
static void	enableAES256()
static byte[]	getFileEncryptionKey(byte[] password, byte[] o, byte[] u, byte[] oe, byte[] ue, long revision) Implementation of algorithm 2.A: Retrieving the file encryption key from an encrypted document in order to decrypt it (revision 6 and later) as described in PDF-2.0 specification.

Methods inherited from class java.lang.Object

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

Constructor Detail

EncryptionToolsRevision5_6

public EncryptionToolsRevision5_6()

Method Detail

getFileEncryptionKey

public static byte[] getFileEncryptionKey(byte[] password,
                                          byte[] o,
                                          byte[] u,
                                          byte[] oe,
                                          byte[] ue,
                                          long revision)
                                   throws GeneralSecurityException

Implementation of algorithm 2.A: Retrieving the file encryption key from an encrypted document in order to decrypt it (revision 6 and later) as described in PDF-2.0 specification.

Parameters:

password - is UTF-8 representation of password.

o - is value of O key.

u - is value of U key.

oe - is value of OE key. At least one of oe, ue should not be null.

ue - is value of UE key. At least one of oe, ue should not be null.

Returns:

calculated file encryption key.

Throws:

GeneralSecurityException - if password is not valid or error with AES-256 happens.

enableAES256

public static void enableAES256()
                         throws GeneralSecurityException

Throws:

GeneralSecurityException