oracle.security.crypto.core

Class SHA

java.lang.Object

oracle.security.crypto.core.MessageDigest

oracle.security.crypto.core.SHA

All Implemented Interfaces:

java.lang.Cloneable

public final class SHA
extends MessageDigest

The SHA (Secure Hash Algorithm) message digest algorithms, as defined in FIPS-180-2 Secure Hash Standard. This class implements SHA-1, SHA-256, SHA-384 and SHA-512.

Nested Class Summary

Nested classes/interfaces inherited from class oracle.security.crypto.core.MessageDigest

MessageDigest.MDState

Field Summary

Fields inherited from class oracle.security.crypto.core.MessageDigest

algID

Constructor Summary

Constructors

Constructor and Description
SHA() Empty constructor.

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.String	algName() Returns the algorithm name of this message digest.
int	blockSize() Returns the block size the message digest.
java.lang.Object	clone() Clone this object.
void	computeCurrent() Completes the hash computation, performing any necessary operations such as padding.
AlgorithmIdentifier	getAlgID() Returns the algorithm identifier of this message digest.
byte[]	getDigestBits() Returns a copy of the current digest bytes.
int	getDigestLength() Returns the length in bytes of the message digest.
protected MessageDigest.MDState	getState() Gets the state of this MessageDigest instance.
void	init() Resets this message digest object to its initial state.
boolean	isValid() Returns true if this SHA is in a valid state and its digest bits are usable; otherwise returns false.
void	setAlgID(AlgorithmIdentifier algID) Sets the SHA algorithm to use.
protected void	setState(MessageDigest.MDState state) Sets the state of this MessageDigest instance.
void	update(byte aValue) Adds one byte to the data being digested.
void	update(byte[] input, int off, int len) Adds the specified sequence of bytes to the data being digested.

Methods inherited from class oracle.security.crypto.core.MessageDigest

computeDigest, computeDigest, getInstance, isEqual, toString, update, update, update, update, update, update, update, update, update, update, update, updateASCII

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SHA

public SHA()

Empty constructor. By default, a newly SHA object will implement the SHA-1 algorithm. To use another SHA algorithm, use the setAlgID method.

Method Detail

setAlgID

public void setAlgID(AlgorithmIdentifier algID)
              throws AlgorithmIdentifierException

Sets the SHA algorithm to use. The possible algorithms are SHA-1, SHA-256, SHA-384 and SHA-512.

Overrides:

setAlgID in class MessageDigest

Parameters:

algID - The AlgorithmIdentifier to use.

Throws:

AlgorithmIdentifierException

See Also:

AlgID

getAlgID

public AlgorithmIdentifier getAlgID()

Returns the algorithm identifier of this message digest.

Specified by:

getAlgID in class MessageDigest

Returns:

An AlgorithIdentifier object representing the hash algorithm of this MessageDigest instance.

algName

public java.lang.String algName()

Returns the algorithm name of this message digest.

Specified by:

algName in class MessageDigest

Returns:

"SHA"

blockSize

public int blockSize()

Returns the block size the message digest.

Specified by:

blockSize in class MessageDigest

getDigestLength

public int getDigestLength()

Returns the length in bytes of the message digest.

Specified by:

getDigestLength in class MessageDigest

init

public void init()

Resets this message digest object to its initial state.

Specified by:

init in class MessageDigest

update

public void update(byte[] input,
          int off,
          int len)

Adds the specified sequence of bytes to the data being digested.

Overrides:

update in class MessageDigest

Parameters:

input - the input array

off - start position in the input array

len - the number of input array elements to add to the data being digested

update

public void update(byte aValue)

Adds one byte to the data being digested.

Specified by:

update in class MessageDigest

getDigestBits

public byte[] getDigestBits()

Returns a copy of the current digest bytes.

Overrides:

getDigestBits in class MessageDigest

isValid

public boolean isValid()

Returns true if this SHA is in a valid state and its digest bits are usable; otherwise returns false.

Overrides:

isValid in class MessageDigest

computeCurrent

public void computeCurrent()

Completes the hash computation, performing any necessary operations such as padding. The final result of the hash is stored in digestBits.

Specified by:

computeCurrent in class MessageDigest

clone

public java.lang.Object clone()

Clone this object.

Specified by:

clone in class MessageDigest

getState

protected MessageDigest.MDState getState()

Description copied from class: MessageDigest

Gets the state of this MessageDigest instance.

Specified by:

getState in class MessageDigest

setState

protected void setState(MessageDigest.MDState state)

Description copied from class: MessageDigest

Sets the state of this MessageDigest instance.

Specified by:

setState in class MessageDigest