ewe.security
Class BlowfishECB

java.lang.Object
  ewe.security.BlowfishECB

Direct Known Subclasses:

BlowfishCBC

public class BlowfishECB

extends Object

Implementation of the Blowfish encryption algorithm in ECB mode.

Field Summary

static int	BLOCKSIZE block size of this cipher (in bytes)
static int	MAXKEYLENGTH maximum possible key length in bytes

Constructor Summary

BlowfishECB(byte[] key)
The default constructor, using a simple binary key.

BlowfishECB(byte[] key, int nOfs, int nLen)

Method Summary

static int	byteArrayToInt(byte[] buf, int nOfs)
void	cleanUp() To clear data in the boxes before an instance is freed, the actual value of this call can be argued, yet still nice to have it.
int	decrypt(byte[] inBuf, int nInPos, byte[] outBuf, int nOutPos, int nLen) Decrypts a byte buffer to another buffer, extra misaligned data will not be processed.
int	encrypt(byte[] inBuf, int nInPos, byte[] outBuf, int nOutPos, int nLen) Encrypts a byte buffer to another buffer, extra misaligned data will not be processed.
protected int	encryptPrv(byte[] inBuf, int nInPos, byte[] outBuf, int nOutPos, int nLen)
void	initialize(byte[] key, int nOfs, int nLen) Initializes the instances, but does not really reset it since the PBOXes are not reset.
void	reset() Reset the Encryptor/Decryptor using the last key used to initialize it.
void	reset(byte[] key, int nOfs, int nlen) Reset the Encryptor/Decryptor using a specific key.
boolean	weakKeyCheck() To check if an instance actually was using a weak key, if so it might be better to use a different key or salt the existing one as alternative.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, toString

Field Detail

MAXKEYLENGTH

public static final int MAXKEYLENGTH

maximum possible key length in bytes

See Also:

Constant Field Values

BLOCKSIZE

public static final int BLOCKSIZE

block size of this cipher (in bytes)

See Also:

Constant Field Values

Constructor Detail

BlowfishECB

public BlowfishECB(byte[] key)

The default constructor, using a simple binary key.

Parameters:

key - key material, up to MAXKEYLENGTH bytes

BlowfishECB

public BlowfishECB(byte[] key,
                   int nOfs,
                   int nLen)

See Also:

BlowfishJ.BlowfishECB#initialize(byte[], int, int)

Method Detail

reset

public void reset()

Reset the Encryptor/Decryptor using the last key used to initialize it.

reset

public void reset(byte[] key,
                  int nOfs,
                  int nlen)

Reset the Encryptor/Decryptor using a specific key.

byteArrayToInt

public static final int byteArrayToInt(byte[] buf,
                                       int nOfs)

initialize

public void initialize(byte[] key,
                       int nOfs,
                       int nLen)

Initializes the instances, but does not really reset it since the PBOXes are not reset. Use the reset() methods to reset it.

Parameters:

key - key material, up to MAXKEYLENGTH bytes

nOfs - where to start reading

nLen - number of bytes

cleanUp

public void cleanUp()

To clear data in the boxes before an instance is freed, the actual value of this call can be argued, yet still nice to have it.

weakKeyCheck

public boolean weakKeyCheck()

To check if an instance actually was using a weak key, if so it might be better to use a different key or salt the existing one as alternative.

Returns:

true: weak key detected / false: key is fine

encryptPrv

protected int encryptPrv(byte[] inBuf,
                         int nInPos,
                         byte[] outBuf,
                         int nOutPos,
                         int nLen)

encrypt

public int encrypt(byte[] inBuf,
                   int nInPos,
                   byte[] outBuf,
                   int nOutPos,
                   int nLen)

Encrypts a byte buffer to another buffer, extra misaligned data will not be processed.

Parameters:

inBuf - buffer with plaintext data

nInPos - where to start reading the plaintext data

outBuf - buffer to put the ciphertext data

nOutPos - where to start writing the ciphertext data

nLen - number of bytes to encrypt

Returns:

number of bytes to encrypted

decrypt

public int decrypt(byte[] inBuf,
                   int nInPos,
                   byte[] outBuf,
                   int nOutPos,
                   int nLen)

Decrypts a byte buffer to another buffer, extra misaligned data will not be processed.

Parameters:

inBuf - buffer with ciphertext data

nInPos - where to start reading the ciphertext data

outBuf - buffer to put the plaintext data

nOutPos - where to start writing the plaintext data

nLen - number of bytes to decrypt

Returns:

number of bytes to encrypted