iaik.security.md
Class SHA32bit

java.lang.Object
  |
  +--java.security.MessageDigestSpi
        |
        +--java.security.MessageDigest
              |
              +--iaik.security.md.AbstractMessageDigest
                    |
                    +--iaik.security.md.SHA32bit

All Implemented Interfaces:

Cloneable

Direct Known Subclasses:

SHA224, SHA256

public abstract class SHA32bit

extends iaik.security.md.AbstractMessageDigest

This class serves as the base class for the 32-bit hash algorithms SHA-256 and SHA-224 from NIST.

Version:

File Revision 4

See Also:

MessageDigest, SHA256

Method Summary

Object	clone() Returns a clone of this SHA256 Object.
protected byte[]	engineDigest() b>SPI: Completes the hash computation by performing final operations such as padding.
int	engineGetDigestLength() SPI: Returns the length of the digest in bytes.
void	engineReset() SPI: Resets this SHA256 message digest object for being supplied with new data.
protected void	engineUpdate(byte input) SPI: Updates the data to be hashed with the specified byte.
protected void	engineUpdate(byte[] input, int offset, int len) SPI: Updates the data to be hashed with the specified number of bytes, beginning at the specified offset within the given byte array.

Methods inherited from class java.security.MessageDigest

digest, digest, digest, getAlgorithm, getDigestLength, getInstance, getInstance, getProvider, isEqual, reset, toString, update, update, update

Methods inherited from class java.security.MessageDigestSpi

engineDigest

Methods inherited from class java.lang.Object

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

Method Detail

clone

public Object clone()

Returns a clone of this SHA256 Object.

Overrides:

clone in class iaik.security.md.AbstractMessageDigest

Returns:

a clone of this SHA256 Object

engineReset

public void engineReset()

SPI: Resets this SHA256 message digest object for being supplied with new data.

This method is called by engineDigest after the actual hash computation has been finished to automatically reset the message digest object for being supplied with new data for starting a new hash computation.

Overrides:

engineReset in class iaik.security.md.AbstractMessageDigest

See Also:

AbstractMessageDigest.engineDigest()

engineUpdate

protected final void engineUpdate(byte input)

SPI: Updates the data to be hashed with the specified byte.

Overrides:

engineUpdate in class MessageDigestSpi

Parameters:

input - the byte to be used for updating.

engineUpdate

protected final void engineUpdate(byte[] input,
                                  int offset,
                                  int len)

SPI: Updates the data to be hashed with the specified number of bytes, beginning at the specified offset within the given byte array.

Overrides:

engineUpdate in class MessageDigestSpi

Parameters:

input - the byte array holding the data to be used for this update operation.

offset - the offset, indicating the start position within the given byte array.

len - the number of bytes to be obtained from the given byte array, starting at the given position.

engineDigest

protected byte[] engineDigest()

b>SPI: Completes the hash computation by performing final operations such as padding. Once engineDigest has been called, the engine should be reset. Resetting is the responsibility of the engine implementor.

Overrides:

engineDigest in class MessageDigestSpi

Returns:

The computed hash value.

See Also:

AbstractMessageDigest.engineReset()

engineGetDigestLength

public int engineGetDigestLength()

SPI: Returns the length of the digest in bytes.

May not be available for applications before JDK versions >= 1.2.x.

Overrides:

engineGetDigestLength in class MessageDigestSpi

Returns:

the length of the digest in bytes.