sun.security.provider
Class SHA5

java.lang.Object
  java.security.MessageDigestSpi
      sun.security.provider.SHA5

All Implemented Interfaces:

Cloneable

Direct Known Subclasses:

SHA3

public class SHA5
extends MessageDigestSpi
implements Cloneable

This class implements the Secure Hash Algorithm SHA-512 developed by the National Institute of Standards and Technology along with the National Security Agency.

It implements java.security.MessageDigestSpi, and can be used through Java Cryptography Architecture (JCA), as a pluggable MessageDigest implementation.

Constructor Summary

SHA5()
Creates a new SHA object.

Method Summary

Object	clone() Returns a clone if the implementation is cloneable.
protected byte[]	engineDigest() Computes the final hash and returns the final value as a byte array.
protected int	engineDigest(byte[] hashvalue, int offset, int len) Computes the final hash and places the final value in the specified array.
protected int	engineGetDigestLength() Returns the digest length in bytes.
protected void	engineReset() Resets the buffers and hash value to start a new hash.
protected void	engineUpdate(byte b) Update a byte.
protected void	engineUpdate(byte[] b, int off, int len) Update a buffer.

Methods inherited from class java.lang.Object

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

Constructor Detail

SHA5

public SHA5()

Creates a new SHA object.

Method Detail

engineGetDigestLength

protected int engineGetDigestLength()

Description copied from class: MessageDigestSpi

Returns the digest length in bytes.

This concrete method has been added to this previously-defined abstract class. (For backwards compatibility, it cannot be abstract.)

The default behavior is to return 0.

This method may be overridden by a provider to return the digest length.

Overrides:

engineGetDigestLength in class MessageDigestSpi

Returns:

the length of the digest in bytes

engineUpdate

protected void engineUpdate(byte b)

Update a byte.

Specified by:

engineUpdate in class MessageDigestSpi

Parameters:

b - the byte

engineUpdate

protected void engineUpdate(byte[] b,
                            int off,
                            int len)

Update a buffer.

Specified by:

engineUpdate in class MessageDigestSpi

Parameters:

b - the data to be updated.

off - the start offset in the data

len - the number of bytes to be updated.

engineReset

protected void engineReset()

Resets the buffers and hash value to start a new hash.

Specified by:

engineReset in class MessageDigestSpi

engineDigest

protected byte[] engineDigest()

Computes the final hash and returns the final value as a byte array. The object is reset to be ready for further use, as specified in java.security.MessageDigest javadoc specification.

Specified by:

engineDigest in class MessageDigestSpi

Returns:

the array of bytes for the resulting hash value.

engineDigest

protected int engineDigest(byte[] hashvalue,
                           int offset,
                           int len)
                    throws DigestException

Computes the final hash and places the final value in the specified array. The object is reset to be ready for further use, as specified in java.security.MessageDigest javadoc specification.

Overrides:

engineDigest in class MessageDigestSpi

Parameters:

hashvalue - buffer to hold the digest

offset - offset for storing the digest

len - length of the buffer

Returns:

length of the digest in bytes

Throws:

DigestException - if an error occurs.

clone

public Object clone()

Description copied from class: MessageDigestSpi

Returns a clone if the implementation is cloneable.

Overrides:

clone in class MessageDigestSpi

Returns:

a clone if the implementation is cloneable.

See Also:

Cloneable