com.basis.filesystem

Class Crypt

java.lang.Object

com.basis.filesystem.Crypt

public abstract class Crypt
extends java.lang.Object

Base class and entry point for BBj encryption services. Subclasses must implement a constructor taking three arguments: (Boolean p_constant, String p_password, Map p_modes) for use as the default Crypt subclass.

Constructor Summary

Constructors

Constructor and Description
Crypt()

Method Summary

Modifier and Type	Method and Description
byte[]	decrypt(byte[] p_buffer, int p_offset, int p_length) Decrypt an arbitrary buffer.
abstract void	decryptBlocks(byte[] p_buffer, int p_offset, int p_length) Decrypt a buffer in place that is a multiple of the block size for this Crypt object is applicable.
byte[]	encrypt(byte[] p_buffer, int p_offset, int p_length) Encrypt an arbitrary buffer.
abstract void	encryptBlocks(byte[] p_buffer, int p_offset, int p_length) Encrypt a buffer in place that is a multiple of the block size for this Crypt object is applicable.
abstract int	getBlockSize() Get the preferred block size for this encryption method.
static Crypt	getCrypt(byte[] p_init, java.lang.String p_password) Get the appropriate Crypt object given an initialization buffer.
static Crypt	getDefaultCrypt(boolean p_constant, java.lang.String p_password, java.util.Map p_modes) Get the default Crypt object with either constant or randomized initialization.
abstract byte[]	getInitialization() Get the initialization buffer suitable for reconstructing the Crypt object.

Methods inherited from class java.lang.Object

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

Constructor Detail

Crypt

public Crypt()

Method Detail

getCrypt

public static Crypt getCrypt(byte[] p_init,
                             java.lang.String p_password)
                      throws FilesystemException

Get the appropriate Crypt object given an initialization buffer.

Parameters:

p_init - Intialization buffer.

p_password - Crypt password.

Returns:

Initialized Crypt object.

Throws:

FilesystemException - if unable to instantiate appropriate Crypt object.

getDefaultCrypt

public static Crypt getDefaultCrypt(boolean p_constant,
                                    java.lang.String p_password,
                                    java.util.Map p_modes)
                             throws FilesystemException

Get the default Crypt object with either constant or randomized initialization.

Parameters:

p_modes - Modes for the initialization.

Returns:

Crypt with randomized initialization.

Throws:

FilesystemException

encrypt

public byte[] encrypt(byte[] p_buffer,
                      int p_offset,
                      int p_length)
               throws FilesystemException

Encrypt an arbitrary buffer. The encrypted buffer is returned and can be a different size from the buffer being encrypted.

Parameters:

p_buffer - Buffer to encrypt.

p_offset - Offset into buffer.

p_length - Length of buffer.

Returns:

Encrypted buffer.

Throws:

FilesystemException - on error.

decrypt

public byte[] decrypt(byte[] p_buffer,
                      int p_offset,
                      int p_length)
               throws FilesystemException

Decrypt an arbitrary buffer. The decrypted buffer is returned and can be a different size from the buffer being decrypted.

Parameters:

p_buffer - Buffer to decrypt.

p_offset - Offset into buffer.

p_length - Length of buffer.

Returns:

Encrypted buffer.

Throws:

FilesystemException - on error.

getInitialization

public abstract byte[] getInitialization()

Get the initialization buffer suitable for reconstructing the Crypt object.

Returns:

Initization buffer.

getBlockSize

public abstract int getBlockSize()

Get the preferred block size for this encryption method. If there is no preferred block size, return a number less than or equal to zero.

Returns:

Preferred block size.

encryptBlocks

public abstract void encryptBlocks(byte[] p_buffer,
                                   int p_offset,
                                   int p_length)
                            throws FilesystemException

Encrypt a buffer in place that is a multiple of the block size for this Crypt object is applicable.

Parameters:

p_buffer - Buffer to encrypt in place.

p_offset - Offset into buffer.

p_length - Length of buffer.

Throws:

FilesystemException - on error.

decryptBlocks

public abstract void decryptBlocks(byte[] p_buffer,
                                   int p_offset,
                                   int p_length)
                            throws FilesystemException

Decrypt a buffer in place that is a multiple of the block size for this Crypt object is applicable.

Parameters:

p_buffer - Buffer to decrypt in place.

p_offset - Offset into buffer.

p_length - Length of buffer.

Throws:

FilesystemException - on error.