org.apache.fulcrum.jce.crypto.algo

Class CryptoStreamPBEImpl

java.lang.Object

org.apache.fulcrum.jce.crypto.extended.CryptoStreamFactoryJ8Template

org.apache.fulcrum.jce.crypto.algo.CryptoStreamPBEImpl

All Implemented Interfaces:

CryptoStreamFactory, CryptoStreamFactoryJ8

public final class CryptoStreamPBEImpl
extends CryptoStreamFactoryJ8Template

Concrete implementation for creating encrypting/decrypting streams. The implementation uses the JCA (Java Crypto Extension) supplied by SUN (using SunJCE 1.42). The implementation uses as @see CryptoParametersJ8 ALGORITHM_J8_PBE for encryption which should be sufficient 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 re-engineer 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:

Georg Kallidis, Siegfried Goeschl , Markus Hahn The Implementation for CryptoParametersJ8.TYPES PBE.

Field Summary

Fields

Modifier and Type	Field and Description
protected static int	COUNT_J8 default count for pbe spec
protected static int	IV_SIZE
protected static int	KEY_SIZE

Fields inherited from class org.apache.fulcrum.jce.crypto.extended.CryptoStreamFactoryJ8Template

algorithm, count, instances, providerName, PROVIDERNAME, salt, SALT_SIZE

Constructor Summary

Constructors

Constructor and Description
CryptoStreamPBEImpl() Constructor count is set to COUNT_J8.
CryptoStreamPBEImpl(byte[] salt) Constructor
CryptoStreamPBEImpl(byte[] salt, int count) Constructor

Method Summary

Modifier and Type	Method and Description
protected byte[]	createCipher(InputStream is, int mode, char[] password) Create a Cipher.
protected Key	createKey(char[] password, byte[] salt) Create a PBE key.

Methods inherited from class org.apache.fulcrum.jce.crypto.extended.CryptoStreamFactoryJ8Template

generateSalt, getAlgorithm, getCount, getInputStream, getInputStream, getInputStream, getInputStream, getInstance, getInstance, getInstance, getOutputStream, getOutputStream, getOutputStream, getProviderName, getSalt, getSmartInputStream, getSmartInputStream, getType, resetInstances, setAlgorithm, setCount, setProviderName, setSalt, setType

Methods inherited from class java.lang.Object

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

Field Detail

IV_SIZE

protected static final int IV_SIZE

See Also:

Constant Field Values

KEY_SIZE

protected static final int KEY_SIZE

See Also:

Constant Field Values

COUNT_J8

protected static final int COUNT_J8

default count for pbe spec

See Also:

Constant Field Values

Constructor Detail

CryptoStreamPBEImpl

public CryptoStreamPBEImpl()
                    throws GeneralSecurityException

Constructor count is set to COUNT_J8.

Throws:

GeneralSecurityException - if no algo could be found.

CryptoStreamPBEImpl

public CryptoStreamPBEImpl(byte[] salt)

Constructor

Parameters:

salt - the salt for the PBE algorithm

CryptoStreamPBEImpl

public CryptoStreamPBEImpl(byte[] salt,
                           int count)

Constructor

Parameters:

salt - the salt for the PBE algorithm

count - the iteration for PBEParameterSpec

Method Detail

createKey

protected Key createKey(char[] password,
                        byte[] salt)
                 throws GeneralSecurityException

Create a PBE key.

Specified by:

createKey in class CryptoStreamFactoryJ8Template

Parameters:

password - the password to use.

salt - if provided this is used, otherweise CryptoStreamFactoryJ8Template.getSalt().

Returns:

the key

Throws:

GeneralSecurityException - if creating the key failed

createCipher

protected byte[] createCipher(InputStream is,
                              int mode,
                              char[] password)
                       throws GeneralSecurityException,
                              IOException

Create a Cipher. Find additional information here: PBEParameterSpec.

Specified by:

createCipher in class CryptoStreamFactoryJ8Template

Parameters:

mode - the cipher mode

password - the password

is - the input stream

Returns:

an instance of a cipher

Throws:

GeneralSecurityException - creating a cipher failed

IOException - creating a cipher failed