gnu.java.security.hash
Class Haval
- Cloneable, IMessageDigest
The
HAVAL message-digest algorithm is a variable output length, with
variable number of rounds. By default, this implementation allows
HAVAL
to be used as a drop-in replacement for
MD5.
References:
- HAVAL - A One-Way Hashing Algorithm with Variable Length of Output
Advances in Cryptology - AUSCRYPT'92, Lecture Notes in Computer Science,
Springer-Verlag, 1993;
Y. Zheng, J. Pieprzyk and J. Seberry.
Haval() - Calls the constructor with two argument using
HAVAL_128_BIT as the
value for the output size (i.e.
|
Haval(int size) - Calls the constructor with two arguments using the designated output size,
and
HAVAL_3_ROUND for the value of number of rounds.
|
Haval(int size, int rounds) - Constructs a
Haval instance with the designated output size
(in bytes).
|
Object | clone() - This method may be called to create a new copy of the
Object.
|
protected byte[] | getResult() - Constructs the result from the contents of the current context.
|
protected byte[] | padBuffer() - Returns the byte array to use as padding before completing a hash
operation.
|
protected void | resetContext() - Resets the instance for future re-use.
|
boolean | selfTest()
|
protected void | transform(byte[] in, int i) - The block digest transformation per se.
|
blockSize , clone , digest , getResult , hashSize , name , padBuffer , reset , resetContext , selfTest , transform , update , update , update |
clone , equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait |
Haval
public Haval()
Calls the constructor with two argument using
HAVAL_128_BIT
as the
value for the output size (i.e.
128
bits, and
HAVAL_3_ROUND
for the value of number of rounds.
Haval
public Haval(int size)
Calls the constructor with two arguments using the designated output size,
and
HAVAL_3_ROUND
for the value of number of rounds.
size
- the output size in bytes of this instance.
Haval
public Haval(int size,
int rounds)
Constructs a Haval
instance with the designated output size
(in bytes). Valid output size
values are 16
,
20
, 24
, 28
and
32
. Valid values for rounds
are in the range
3..5
inclusive.
size
- the output size in bytes of this instance.rounds
- the number of rounds to apply when transforming data.
clone
public Object clone()
This method may be called to create a new copy of the
Object. The typical behavior is as follows:
o == o.clone()
is falseo.getClass() == o.clone().getClass()
is trueo.equals(o)
is true
However, these are not strict requirements, and may
be violated if necessary. Of the three requirements, the
last is the most commonly violated, particularly if the
subclass does not override
Object.equals(Object)
.
If the Object you call clone() on does not implement
Cloneable
(which is a placeholder interface), then
a CloneNotSupportedException is thrown. Notice that
Object does not implement Cloneable; this method exists
as a convenience for subclasses that do.
Object's implementation of clone allocates space for the
new Object using the correct class, without calling any
constructors, and then fills in all of the new field values
with the old field values. Thus, it is a shallow copy.
However, subclasses are permitted to make a deep copy.
All array types implement Cloneable, and override
this method as follows (it should never fail):
public Object clone()
{
try
{
super.clone();
}
catch (CloneNotSupportedException e)
{
throw new InternalError(e.getMessage());
}
}
- clone in interface IMessageDigest
- clone in interface BaseHash
getResult
protected byte[] getResult()
Constructs the result from the contents of the current context.
- getResult in interface BaseHash
- the output of the completed hash operation.
padBuffer
protected byte[] padBuffer()
Returns the byte array to use as padding before completing a hash
operation.
- padBuffer in interface BaseHash
- the bytes to pad the remaining bytes in the buffer before
completing a hash operation.
transform
protected void transform(byte[] in,
int i)
The block digest transformation per se.
- transform in interface BaseHash
in
- the blockSize long block, as an array of bytes to digest.
Haval.java --
Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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