de.flexiprovider.common.mode
Class ECB

java.lang.Object
  |
  +--de.flexiprovider.api.Mode
        |
        +--de.flexiprovider.common.mode.ECB

public class ECB

extends Mode

This class implements the Electronic Codebook Mode (ECB) for symmetric block ciphers.

The ECB mode directly applies the forward cipher function onto each block of plaintext. Under a given key, blocks of plaintext that are equal are mapped onto the same block of ciphertext. Decryption is accomplished by applying the inverse cipher function onto blocks of ciphertext.

Author:

Ralf-P. Weinmann

Fields inherited from class de.flexiprovider.api.Mode

blockSize, iv

Constructor Summary

ECB()

Method Summary

protected void	initDecrypt(SecretKey key, ModeParameterSpec modeParams, AlgorithmParameterSpec cipherParams) Initialize the Mode object for decryption.
protected void	initEncrypt(SecretKey key, ModeParameterSpec modeParams, AlgorithmParameterSpec cipherParams) Initialize the Mode object for encryption.
protected void	nextChunkDecrypt(byte[] input, int inOff, byte[] output, int outOff) Decrypt the next data block.
protected void	nextChunkEncrypt(byte[] input, int inOff, byte[] output, int outOff) Encrypt the next data block.
protected void	reset() ECB does not perform any operations on reset.

Methods inherited from class de.flexiprovider.api.Mode

getCipherBlockSize, initCipherDecrypt, initCipherEncrypt, setBlockCipher, singleBlockDecrypt, singleBlockEncrypt

Methods inherited from class java.lang.Object

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

Constructor Detail

ECB

public ECB()

Method Detail

initEncrypt

protected final void initEncrypt(SecretKey key,
                                 ModeParameterSpec modeParams,
                                 AlgorithmParameterSpec cipherParams)
                          throws InvalidKeyException,
                                 InvalidAlgorithmParameterException

Initialize the Mode object for encryption.

Overrides:

initEncrypt in class Mode

Parameters:

key - the key used for encryption

modeParams - additional mode parameters (not used)

cipherParams - additional algorithm parameters

Throws:

InvalidKeyException - if the key is inappropriate for initializing the underlying block cipher.

InvalidAlgorithmParameterException - if the parameters are inappropriate for initializing the underlying block cipher.

initDecrypt

protected final void initDecrypt(SecretKey key,
                                 ModeParameterSpec modeParams,
                                 AlgorithmParameterSpec cipherParams)
                          throws InvalidKeyException,
                                 InvalidAlgorithmParameterException

Initialize the Mode object for decryption.

Overrides:

initDecrypt in class Mode

Parameters:

key - the key used for decryption

modeParams - additional mode parameters (not used)

cipherParams - additional algorithm parameters

Throws:

InvalidKeyException - if the key is inappropriate for initializing the underlying block cipher.

InvalidAlgorithmParameterException - if the parameters are inappropriate for initializing the underlying block cipher.

nextChunkEncrypt

protected final void nextChunkEncrypt(byte[] input,
                                      int inOff,
                                      byte[] output,
                                      int outOff)

Encrypt the next data block. Any special features of the Mode should be implemented here.

Overrides:

nextChunkEncrypt in class Mode

Parameters:

input - input data buffer

inOff - input data offset

output - output data buffer

outOff - output data offset

nextChunkDecrypt

protected final void nextChunkDecrypt(byte[] input,
                                      int inOff,
                                      byte[] output,
                                      int outOff)

Decrypt the next data block. Any special features of the Mode should be implemented here.

Overrides:

nextChunkDecrypt in class Mode

Parameters:

input - input data buffer

inOff - input data offset

output - output data buffer

outOff - output data offset

reset

protected final void reset()

ECB does not perform any operations on reset.

Overrides:

reset in class Mode