Class CipherStorageProvider

java.lang.Object

org.apache.james.mime4j.storage.AbstractStorageProvider

org.apache.james.mime4j.storage.CipherStorageProvider

All Implemented Interfaces:

StorageProvider

public class CipherStorageProvider
extends AbstractStorageProvider

A StorageProvider that transparently scrambles and unscrambles the data stored by another StorageProvider.

Example usage:

StorageProvider mistrusted = new TempFileStorageProvider();
StorageProvider enciphered = new CipherStorageProvider(mistrusted);
StorageProvider provider = new ThresholdStorageProvider(enciphered);
DefaultStorageProvider.setInstance(provider);

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static final class	CipherStorageProvider.CipherStorage
private static final class	CipherStorageProvider.CipherStorageOutputStream

Field Summary

Fields

Modifier and Type	Field	Description
private final String	algorithm
private final StorageProvider	backend
private final KeyGenerator	keygen

Constructor Summary

Constructors

Constructor	Description
CipherStorageProvider(StorageProvider backend)	Creates a new CipherStorageProvider for the given back-end using the Blowfish cipher algorithm.
CipherStorageProvider(StorageProvider backend, String algorithm)	Creates a new CipherStorageProvider for the given back-end and cipher algorithm.

Method Summary

Modifier and Type	Method	Description
StorageOutputStream	createStorageOutputStream()	Creates a StorageOutputStream where data to be stored can be written to.
private SecretKeySpec	getSecretKeySpec()

Methods inherited from class AbstractStorageProvider

store

Methods inherited from class Object

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

Field Details

backend

private final StorageProvider backend

algorithm

private final String algorithm

keygen

private final KeyGenerator keygen

Constructor Details

CipherStorageProvider

public CipherStorageProvider(StorageProvider backend)

Creates a new CipherStorageProvider for the given back-end using the Blowfish cipher algorithm.

Parameters:

backend - back-end storage strategy to encrypt.

CipherStorageProvider

public CipherStorageProvider(StorageProvider backend,
 String algorithm)

Creates a new CipherStorageProvider for the given back-end and cipher algorithm.

Parameters:

backend - back-end storage strategy to encrypt.

algorithm - the name of the symmetric block cipher algorithm such as "Blowfish", "AES" or "RC2".

Method Details

createStorageOutputStream

public StorageOutputStream createStorageOutputStream()
                                              throws IOException

Description copied from interface: StorageProvider

Creates a StorageOutputStream where data to be stored can be written to. Subsequently the user can call toStorage() on that object to get a Storage instance that holds the data that has been written.

Returns:

a StorageOutputStream where data can be written to.

Throws:

IOException - if an I/O error occurs.

getSecretKeySpec

private SecretKeySpec getSecretKeySpec()