gnu.java.security.hash
Class BaseHash
- Cloneable, IMessageDigest
A base abstract class to facilitate hash implementations.
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()- Returns the algorithm's (inner) block size in bytes.
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abstract Object | clone()- Returns a clone copy of this instance.
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byte[] | digest()- Completes the message digest by performing final operations such as padding
and resetting the instance.
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protected abstract byte[] | getResult()- Constructs the result from the contents of the current context.
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int | hashSize()- Returns the output length in bytes of this message digest algorithm.
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String | name()- Returns the canonical name of this algorithm.
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protected abstract byte[] | padBuffer()- Returns the byte array to use as padding before completing a hash
operation.
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void | reset()- Resets the current context of this instance clearing any eventually cached
intermediary values.
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protected abstract void | resetContext()- Resets the instance for future re-use.
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abstract boolean | selfTest()- A basic test.
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protected abstract void | transform(byte[] in, int offset)- The block digest transformation per se.
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void | update(byte b)- Continues a message digest operation using the input byte.
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void | update(byte[] b)- Continues a message digest operation, by filling the buffer, processing
data in the algorithm's HASH_SIZE-bit block(s), updating the context and
count, and buffering the remaining bytes in buffer for the next operation.
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void | update(byte[] b, int offset, int len)- Continues a message digest operation, by filling the buffer, processing
data in the algorithm's HASH_SIZE-bit block(s), updating the context and
count, and buffering the remaining bytes in buffer for the next operation.
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clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
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.
transform
protected abstract 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.
update
public void update(byte[] b)
Continues a message digest operation, by filling the buffer, processing
data in the algorithm's HASH_SIZE-bit block(s), updating the context and
count, and buffering the remaining bytes in buffer for the next operation.
- update in interface IMessageDigest
update
public void update(byte[] b,
int offset,
int len) Continues a message digest operation, by filling the buffer, processing
data in the algorithm's HASH_SIZE-bit block(s), updating the context and
count, and buffering the remaining bytes in buffer for the next operation.
- update in interface IMessageDigest
offset - start of meaningful bytes in input block.
BaseHash.java --
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