org.apache.fulcrum.jce.crypto

Class CryptoStreamFactoryImpl

java.lang.Object

org.apache.fulcrum.jce.crypto.CryptoStreamFactoryImpl

All Implemented Interfaces:

CryptoStreamFactory

public final class CryptoStreamFactoryImpl
extends java.lang.Object
implements CryptoStreamFactory

Concrete factory for creating encrypting/decrypting streams. The implementation uses the JCE (Java Crypto Extension) either supplied by SUN (using SunJCE 1.42) or an custom provider such as BouncyCastle or the newer Cryptix libraries. The implementation uses as PBEWithMD5AndTripleDES for encryption which should be sufficent for most applications. The implementation also supplies a default password in the case that the programmer don't want to have additional hassles. It is easy to reengineer the password being used but much better than a hard-coded password in the application. The code uses parts from Markus Hahn's Blowfish library found at http://blowfishj.sourceforge.net/

Author:

Siegfried Goeschl , Markus Hahn

Constructor Summary

Constructors

Constructor and Description
CryptoStreamFactoryImpl() Constructor
CryptoStreamFactoryImpl(byte[] salt, int count, java.lang.String algorithm, java.lang.String providerName) Constructor

Method Summary

Methods

Modifier and Type	Method and Description
java.io.InputStream	getInputStream(java.io.InputStream is) Creates a decrypting input stream.
java.io.InputStream	getInputStream(java.io.InputStream is, char[] password) Creates an decrypting input stream
static CryptoStreamFactory	getInstance() Factory method to get a default instance
java.io.OutputStream	getOutputStream(java.io.OutputStream os, char[] password) Creates an encrypting output stream
java.io.InputStream	getSmartInputStream(java.io.InputStream is) Creates a smart decrypting input stream.
java.io.InputStream	getSmartInputStream(java.io.InputStream is, char[] password) Creates an decrypting input stream
static void	setInstance(CryptoStreamFactory instance) Set the default instance from an external application.

Methods inherited from class java.lang.Object

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

Constructor Detail

CryptoStreamFactoryImpl

public CryptoStreamFactoryImpl()

Constructor

CryptoStreamFactoryImpl

public CryptoStreamFactoryImpl(byte[] salt,
                       int count,
                       java.lang.String algorithm,
                       java.lang.String providerName)

Constructor

Parameters:

salt - the salt for the PBE algorithm

count - the iteration for PBEParameterSpec

algorithm - the algorithm to be used

providerName - the name of the JCE provide to b used

Method Detail

getInstance

public static CryptoStreamFactory getInstance()

Factory method to get a default instance

Returns:

an instance of the CryptoStreamFactory

setInstance

public static void setInstance(CryptoStreamFactory instance)

Set the default instance from an external application.

Parameters:

instance - the new default instance

getInputStream

public java.io.InputStream getInputStream(java.io.InputStream is)
                                   throws java.security.GeneralSecurityException,
                                          java.io.IOException

Description copied from interface: CryptoStreamFactory

Creates a decrypting input stream.

Specified by:

getInputStream in interface CryptoStreamFactory

Parameters:

is - the input stream to be wrapped

Returns:

an decrypting input stream

Throws:

java.security.GeneralSecurityException - creating the input stream failed

java.io.IOException - creating the input stream failed

See Also:

CryptoStreamFactory.getInputStream(java.io.InputStream)

getInputStream

public java.io.InputStream getInputStream(java.io.InputStream is,
                                 char[] password)
                                   throws java.security.GeneralSecurityException,
                                          java.io.IOException

Description copied from interface: CryptoStreamFactory

Creates an decrypting input stream

Specified by:

getInputStream in interface CryptoStreamFactory

Parameters:

is - the input stream to be wrapped

password - the password to be used

Returns:

an decrypting input stream

Throws:

java.security.GeneralSecurityException - creating the input stream failed

java.io.IOException - creating the input stream failed

See Also:

CryptoStreamFactory.getInputStream(java.io.InputStream,char[])

getSmartInputStream

public java.io.InputStream getSmartInputStream(java.io.InputStream is)
                                        throws java.security.GeneralSecurityException,
                                               java.io.IOException

Description copied from interface: CryptoStreamFactory

Creates a smart decrypting input stream.

Specified by:

getSmartInputStream in interface CryptoStreamFactory

Parameters:

is - the input stream to be wrapped

Returns:

an decrypting input stream

Throws:

java.security.GeneralSecurityException - creating the input stream failed

java.io.IOException - creating the input stream failed

See Also:

CryptoStreamFactory.getSmartInputStream(java.io.InputStream)

getSmartInputStream

public java.io.InputStream getSmartInputStream(java.io.InputStream is,
                                      char[] password)
                                        throws java.security.GeneralSecurityException,
                                               java.io.IOException

Description copied from interface: CryptoStreamFactory

Creates an decrypting input stream

Specified by:

getSmartInputStream in interface CryptoStreamFactory

Parameters:

is - the input stream to be wrapped

password - the password to be used

Returns:

an decrypting input stream

Throws:

java.security.GeneralSecurityException - creating the input stream failed

java.io.IOException - creating the input stream failed

See Also:

CryptoStreamFactory.getSmartInputStream(java.io.InputStream,char[])

getOutputStream

public java.io.OutputStream getOutputStream(java.io.OutputStream os,
                                   char[] password)
                                     throws java.security.GeneralSecurityException,
                                            java.io.IOException

Description copied from interface: CryptoStreamFactory

Creates an encrypting output stream

Specified by:

getOutputStream in interface CryptoStreamFactory

Parameters:

os - the output stream to be wrapped

password - the password to be used

Returns:

an decrypting input stream

Throws:

java.security.GeneralSecurityException - creating the ouptut stream failed

java.io.IOException - creating the ouptut stream failed

See Also:

CryptoStreamFactory.getOutputStream(java.io.OutputStream, char[])