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java.lang.Object | +--xjava.security.IJCE_Traceable | +--xjava.security.Cipher | +--cryptix.provider.cipher.Blowfish
This class implements the Blowfish block cipher.
Blowfish was designed by Bruce Schneier. The algorithm is in the public domain.
References:
Copyright © 1997
Systemics Ltd on behalf of the
Cryptix Development Team.
All rights reserved.
$Revision: 1.8 $
Fields inherited from class xjava.security.Cipher |
DECRYPT, ENCRYPT, UNINITIALIZED |
Fields inherited from class xjava.security.IJCE_Traceable |
tracing |
Constructor Summary | |
Blowfish()
Constructs a Blowfish cipher object, in the UNINITIALIZED state. |
Method Summary | |
(package private) static void |
|
java.lang.Object |
clone()
Always throws a CloneNotSupportedException (cloning of ciphers is not supported for security reasons). |
protected int |
engineBlockSize()
SPI: Returns the length of an input block, in bytes. |
protected java.lang.Object |
engineGetParameter(java.lang.String param)
SPI: Gets the value of the specified algorithm parameter. |
protected void |
engineInitDecrypt(java.security.Key key)
SPI: Initializes this cipher for decryption, using the specified key. |
protected void |
engineInitEncrypt(java.security.Key key)
SPI: Initializes this cipher for encryption, using the specified key. |
protected void |
engineSetParameter(java.lang.String param,
java.lang.Object value)
SPI: Sets the specified algorithm parameter to the specified value. |
protected int |
engineUpdate(byte[] in,
int inOffset,
int inLen,
byte[] out,
int outOffset)
SPI: This is the main engine method for updating data. |
protected void |
finalize()
Cleans up resources used by this instance, if necessary. |
static LinkStatus |
getLinkStatus()
Gets an object representing the native linking status of this class. |
int |
getRounds()
Returns the currently set number of rounds for this instance. |
static void |
main(java.lang.String[] args)
Entry point for very basic self_test . |
void |
setRounds(int r)
Sets the number of rounds for this cipher. |
Methods inherited from class xjava.security.IJCE_Traceable |
disableTracing, enableTracing, traceMethod, traceResult, traceResult, traceVoidMethod |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
public Blowfish()
We define a "rounds" property to allow running the algorithm in a number of rounds different than the default value; i.e. 16. Note however that there is not enough defined initial data for any number of rounds other than 16 for the time being.
CryptixException
- if a CRC check fails on the initial
values of the S and P boxes.Method Detail |
public static LinkStatus getLinkStatus()
static void()
protected final void finalize()
finalize
in class java.lang.Object
public final java.lang.Object clone() throws java.lang.CloneNotSupportedException
clone
in class Cipher
xjava.security.Cipher
java.lang.CloneNotSupportedException
- if the cipher is not cloneable.protected int engineBlockSize()
engineBlockSize
in class Cipher
protected void engineInitEncrypt(java.security.Key key) throws java.security.InvalidKeyException, CryptixException
engineInitEncrypt
in class Cipher
key
- the key to use for encryption.java.security.InvalidKeyException
- when one of the following occurs: CryptixException
- if any one of the two self-tests fail.
The two self-tests are as follows: protected void engineInitDecrypt(java.security.Key key) throws java.security.InvalidKeyException, CryptixException
engineInitDecrypt
in class Cipher
key
- the key to use for decryption.java.security.InvalidKeyException
- when one of the following occurs: CryptixException
- if any one of the two self-tests fail.
The two self-tests are as follows: protected int engineUpdate(byte[] in, int inOffset, int inLen, byte[] out, int outOffset)
in and out may be the same array, and the input and output regions may overlap.
engineUpdate
in class Cipher
in
- the input data.inOffset
- the offset into in specifying where the data starts.inLen
- the length of the subarray.out
- the output array.outOffset
- the offset indicating where to start writing into
the out array.CryptixException
- if the native library is being used, and it
reports an error.protected void engineSetParameter(java.lang.String param, java.lang.Object value) throws java.security.InvalidParameterException, InvalidParameterTypeException
Blowfish has a single parameter, "rounds", which specifies the number of rounds for this instance as a decimal String.
engineSetParameter
in class Cipher
param
- the string name of the parameter.value
- the parameter value.java.security.InvalidParameterException
- if param is an invalid
parameter for this cipher implementation, the
parameter is already set and cannot be set again, a
security exception occurs, and so on.InvalidParameterTypeException
- if value is of the wrong
type.protected java.lang.Object engineGetParameter(java.lang.String param)
Blowfish has a single parameter, "rounds", which specifies the number of rounds for this instance as a decimal String.
engineGetParameter
in class Cipher
param
- the string name of the parameter.public void setRounds(int r)
If the specified number is invalid, an IllegalArgumentException is thrown.
Note that there is not enough defined initial data for any number of rounds other than 16 for the time being.
r
- the desired number of rounds for this cipher.java.lang.IllegalArgumentException
- if the given number of rounds is
not supported.public int getRounds()
public static void main(java.lang.String[] args)
self_test
.
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