org.apache.derby.impl.store.raw.data
Class EncryptOrDecryptData

java.lang.Object
  org.apache.derby.impl.store.raw.data.EncryptOrDecryptData

All Implemented Interfaces:

java.security.PrivilegedAction

public class EncryptOrDecryptData
extends java.lang.Object
implements java.security.PrivilegedAction

This class is used to encrypt all the containers in the data segment with a new encryption key when password/key is changed or when an existing database is reconfigured for encryption. Encryption of existing data in the data segments is done by doing the following: Find all the containers in data segment (seg0) and encrypt all of them with the new encryption key, the process for each container is: 1.Write a log record to indicate that the container is getting encrypted. 2.Read all the pages of the container through the page cache and encrypt each page with new encryption key and then write to a temporary file(n.dat) in the data segment itself. 3. Rename the current container file (c.dat) to another file (o.dat) 4. Rename the new encrypted version of the file (n.dat). 5. All the old version of the container (o.dat) files are removed after a successful checkpoint with a new key or on a rollback.

Field Summary

private int	actionCode
private StorageFile	actionDestStorageFile
private StorageFile	actionStorageFile
private BaseDataFileFactory	dataFactory
private static int	STORAGE_FILE_DELETE_ACTION
private static int	STORAGE_FILE_EXISTS_ACTION
private static int	STORAGE_FILE_RENAME_ACTION
private StorageFactory	storageFactory

Constructor Summary

EncryptOrDecryptData(BaseDataFileFactory dataFactory)

Method Summary

void	decryptAllContainers(RawTransaction t) Finds all the all the containers stored in the data directory and decrypts them.
void	encryptAllContainers(RawTransaction t) Find all the all the containers stored in the data directory and encrypt them.
private void	encryptOrDecryptAllContainers(RawTransaction t, boolean doEncrypt) Encrypts or decrypts all containers in the database data directory.
private void	encryptOrDecryptContainer(RawTransaction t, ContainerKey ckey, boolean doEncrypt) Encrypts or decrypts the specified container.
private StorageFile	getFile(ContainerKey containerId, boolean old) Get file handle to a container file that is used to keep temporary versions of the container file.
private StorageFile	getFile(java.lang.String ctrFileName)
private java.lang.String	getFilePath(ContainerKey containerId, boolean old) Get path to a container file that is used to keep temporary versions of the container file.
private boolean	isOldContainerFile(java.lang.String fileName)
private boolean	privDelete(StorageFile file)
private boolean	privExists(StorageFile file)
private boolean	privRename(StorageFile fromFile, StorageFile destFile)
void	removeOldVersionOfContainers() Removes old versions of the containers after a cryptographic operation on the database.
(package private) void	restoreContainer(ContainerKey containerId)
java.lang.Object	run()

Methods inherited from class java.lang.Object

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

Field Detail

dataFactory

private BaseDataFileFactory dataFactory

storageFactory

private StorageFactory storageFactory

STORAGE_FILE_EXISTS_ACTION

private static final int STORAGE_FILE_EXISTS_ACTION

See Also:

Constant Field Values

STORAGE_FILE_DELETE_ACTION

private static final int STORAGE_FILE_DELETE_ACTION

See Also:

Constant Field Values

STORAGE_FILE_RENAME_ACTION

private static final int STORAGE_FILE_RENAME_ACTION

See Also:

Constant Field Values

actionCode

private int actionCode

actionStorageFile

private StorageFile actionStorageFile

actionDestStorageFile

private StorageFile actionDestStorageFile

Constructor Detail

EncryptOrDecryptData

public EncryptOrDecryptData(BaseDataFileFactory dataFactory)

Method Detail

decryptAllContainers

public void decryptAllContainers(RawTransaction t)
                          throws StandardException

Finds all the all the containers stored in the data directory and decrypts them.

Parameters:

t - the transaction that is used for the decryption operation

Throws:

StandardException - Standard Derby error policy

encryptAllContainers

public void encryptAllContainers(RawTransaction t)
                          throws StandardException

Find all the all the containers stored in the data directory and encrypt them.

Parameters:

t - the transaction that is used for the encryption operation

Throws:

StandardException - Standard Derby error policy

encryptOrDecryptAllContainers

private void encryptOrDecryptAllContainers(RawTransaction t,
                                           boolean doEncrypt)
                                    throws StandardException

Encrypts or decrypts all containers in the database data directory.

Parameters:

t - transaction used for the cryptographic operation

doEncrypt - tells whether to encrypt or decrypt

Throws:

StandardException - Standard Derby error policy

encryptOrDecryptContainer

private void encryptOrDecryptContainer(RawTransaction t,
                                       ContainerKey ckey,
                                       boolean doEncrypt)
                                throws StandardException

Encrypts or decrypts the specified container.

Parameters:

t - transaction that used to perform the cryptographic operation

ckey - the key of the container that is being encrypted/decrypted

doEncrypt - tells whether to encrypt or decrypt

Throws:

StandardException - Standard Derby error policy

getFile

private StorageFile getFile(ContainerKey containerId,
                            boolean old)

Get file handle to a container file that is used to keep temporary versions of the container file.

getFilePath

private java.lang.String getFilePath(ContainerKey containerId,
                                     boolean old)

Get path to a container file that is used to keep temporary versions of the container file.

isOldContainerFile

private boolean isOldContainerFile(java.lang.String fileName)

getFile

private StorageFile getFile(java.lang.String ctrFileName)

restoreContainer

void restoreContainer(ContainerKey containerId)
                throws StandardException

Throws:

StandardException

removeOldVersionOfContainers

public void removeOldVersionOfContainers()
                                  throws StandardException

Removes old versions of the containers after a cryptographic operation on the database.

Throws:

StandardException

privExists

private boolean privExists(StorageFile file)

privDelete

private boolean privDelete(StorageFile file)

privRename

private boolean privRename(StorageFile fromFile,
                           StorageFile destFile)

run

public java.lang.Object run()

Specified by:

run in interface java.security.PrivilegedAction