gnu.crypto.hash
Class BaseHash
- Cloneable, IMessageDigest
public abstract class BaseHash
extends java.lang.Object
A base abstract class to facilitate hash implementations.
Version:
protected int | blockSize - The hash (inner) block size in bytes.
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protected byte[] | buffer - Temporary input buffer.
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protected long | count - Number of bytes processed so far.
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protected int | hashSize - The hash (output) size in bytes.
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protected String | name - The canonical name prefix of the hash.
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BaseHash(String name, int hashSize, int blockSize) - Trivial constructor for use by concrete subclasses.
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int | blockSize()
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Object | clone()
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byte[] | digest()
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protected byte[] | getResult() - Constructs the result from the contents of the current context.
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int | hashSize()
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String | name()
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protected byte[] | padBuffer() - Returns the byte array to use as padding before completing a hash
operation.
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void | reset()
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protected void | resetContext() - Resets the instance for future re-use.
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boolean | selfTest()
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protected void | transform(byte[] in, int offset) - The block digest transformation per se.
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void | update(byte b)
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void | update(byte[] b, int offset, int len)
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blockSize
protected int blockSize
The hash (inner) block size in bytes.
buffer
protected byte[] buffer
Temporary input buffer.
count
protected long count
Number of bytes processed so far.
hashSize
protected int hashSize
The hash (output) size in bytes.
name
protected String name
The canonical name prefix of the hash.
BaseHash
protected BaseHash(String name,
int hashSize,
int blockSize)
Trivial constructor for use by concrete subclasses.
name
- the canonical name prefix of this instance.hashSize
- the block size of the output in bytes.blockSize
- the block size of the internal transform.
getResult
protected byte[] getResult()
Constructs the result from the contents of the current context.
- the output of the completed hash operation.
padBuffer
protected byte[] padBuffer()
Returns the byte array to use as padding before completing a hash
operation.
- the bytes to pad the remaining bytes in the buffer before
completing a hash operation.
resetContext
protected void resetContext()
Resets the instance for future re-use.
transform
protected void transform(byte[] in,
int offset)
The block digest transformation per se.
in
- the blockSize long block, as an array of bytes to digest.offset
- the index where the data to digest is located within the
input buffer.
Copyright © 2001, 2002, 2003
Free Software Foundation,
Inc. All Rights Reserved.