lava.security.des
Class DesCfbEncoder

java.lang.Object
  |
  +--lava.security.des.DesFbCoder
        |
        +--lava.security.des.DesCfbEncoder

public class DesCfbEncoder

extends DesFbCoder

DES encryption in Cipher FeedBack (CFB) mode.

Details: DesCfbEncoder performs data encryption using DES in cipher feedback (CFB) mode. This special mode of DES is described in FIPS PUB 81. Refer to the superclass documentation and for details.

Since:

1999.08.23

Author:

Sharky

See Also:

DesCfbDecoder

Constructor Summary

DesCfbEncoder(DesKey key, int k, long iv)
Initializes with DES function, value for k, and initialization vector.

DesCfbEncoder(IBlockCipher64 engine, int k, long iv)
Initializes with arbitrary block cipher, value for k, and initialization vector.

Method Summary

int	continueTransform(java.lang.Object input, java.lang.Object output, int len) ITextTransform interface method.

Methods inherited from class lava.security.des.DesFbCoder

beginTransform, completeTransform, getTransformInputWidth, getTransformOutputWidth

Methods inherited from class java.lang.Object

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

Constructor Detail

DesCfbEncoder

public DesCfbEncoder(IBlockCipher64 engine,
                     int k,
                     long iv)

Initializes with arbitrary block cipher, value for k, and initialization vector.

Details: This constructor initializes a new instance to encrypt k-bit symbols using the given 64-bit block cipher and initialization vector (IV).

Parameters:

engine - the block cipher

k - the symbol width

iv - the initialization vector

DesCfbEncoder

public DesCfbEncoder(DesKey key,
                     int k,
                     long iv)

Initializes with DES function, value for k, and initialization vector.

Details: This constructor initializes a new instance to encrypt k-bit symbols using the DES encryption function corresponding to the given key and initialization vector (IV).

Parameters:

engine - the block cipher

k - the symbol width

iv - the initialization vector

Method Detail

continueTransform

public int continueTransform(java.lang.Object input,
                             java.lang.Object output,
                             int len)

ITextTransform interface method.

Details: Refer to ITextTransform for a description of this interface method's contract.

This implementation immediately produces one output symbol for each input symbol.

Parameters:

input - the input symbols

output - buffer for output symbols

len - number of input symbols to process

Returns:

number of output symbols written to output