com.ibm.crypto.fips.provider

Class SHA224

java.lang.Object

java.security.MessageDigestSpi

com.ibm.crypto.fips.provider.SHA224

All Implemented Interfaces:

java.lang.Cloneable

public final class SHA224
extends java.security.MessageDigestSpi
implements java.lang.Cloneable

This class implements the Secure Hash Algorithm 224 (SHA224) developed by the National Institute of Standards and Technology along with the National Security Agency. The algorithm is the same as SHA2, but with a different initial value and a truncation from 256 to 224 bits when producing the final value.

Constructor Summary

Constructors

Constructor and Description
SHA224() Standard constructor, creates a new SHA2 instance, allocates its buffers from the heap.

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.Object	clone() Clones this object.
protected byte[]	engineDigest() Compute the final hash and reset the engine so that it is ready for re-use, as specifed by MessageDigest.
protected int	engineDigest(byte[] buf, int offset, int len) Compute the final hash and reset the engine so that it is ready for re-use, as specifed by MessageDigest.
protected int	engineGetDigestLength() Return the digest length in bytes
protected void	engineReset()
protected void	engineUpdate(byte b) Update adds the passed byte to the digested data.
protected void	engineUpdate(byte[] input, int offset, int len) Update adds the selected part of an array of bytes to the digest.
void	init() Initialize the SHA2 information
java.lang.Object	internalClone() Clones this object.
protected byte[]	internalDigest() Compute the final hash and reset the engine so that it is ready for re-use, as specifed by MessageDigest.
protected int	internalDigest(byte[] buf, int offset, int len) Compute the final hash and reset the engine so that it is ready for re-use, as specifed by MessageDigest.
protected int	internalGetDigestLength() Return the digest length in bytes
void	internalInit() Initialize the SHA2 information
protected void	internalReset()
protected void	internalUpdate(byte b) Update adds the passed byte to the digested data.
protected void	internalUpdate(byte[] input, int offset, int len) Update adds the selected part of an array of bytes to the digest.

Methods inherited from class java.security.MessageDigestSpi

engineUpdate

Methods inherited from class java.lang.Object

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

Constructor Detail

SHA224

public SHA224()

Standard constructor, creates a new SHA2 instance, allocates its buffers from the heap.

Method Detail

init

public void init()

Initialize the SHA2 information

Throws:

FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.

internalInit

public void internalInit()

Initialize the SHA2 information

engineReset

protected void engineReset()

Specified by:

engineReset in class java.security.MessageDigestSpi

Throws:

FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.

internalReset

protected void internalReset()

engineGetDigestLength

protected int engineGetDigestLength()

Return the digest length in bytes

Overrides:

engineGetDigestLength in class java.security.MessageDigestSpi

Throws:

FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.

internalGetDigestLength

protected int internalGetDigestLength()

Return the digest length in bytes

engineUpdate

protected void engineUpdate(byte b)

Update adds the passed byte to the digested data.

Specified by:

engineUpdate in class java.security.MessageDigestSpi

Throws:

FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.

internalUpdate

protected void internalUpdate(byte b)

Update adds the passed byte to the digested data.

engineUpdate

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

Update adds the selected part of an array of bytes to the digest. This version is more efficient than the byte-at-a-time version; it avoids data copies and reduces per-byte call overhead.

Specified by:

engineUpdate in class java.security.MessageDigestSpi

Throws:

FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.

internalUpdate

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

Update adds the selected part of an array of bytes to the digest. This version is more efficient than the byte-at-a-time version; it avoids data copies and reduces per-byte call overhead.

engineDigest

protected byte[] engineDigest()

Compute the final hash and reset the engine so that it is ready for re-use, as specifed by MessageDigest.

Specified by:

engineDigest in class java.security.MessageDigestSpi

Throws:

FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.

internalDigest

protected byte[] internalDigest()

Compute the final hash and reset the engine so that it is ready for re-use, as specifed by MessageDigest.

engineDigest

protected int engineDigest(byte[] buf,
               int offset,
               int len)
                    throws java.security.DigestException

Compute the final hash and reset the engine so that it is ready for re-use, as specifed by MessageDigest.

Overrides:

engineDigest in class java.security.MessageDigestSpi

Throws:

FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.

java.security.DigestException

internalDigest

protected int internalDigest(byte[] buf,
                 int offset,
                 int len)
                      throws java.security.DigestException

Compute the final hash and reset the engine so that it is ready for re-use, as specifed by MessageDigest.

Throws:

java.security.DigestException

clone

public java.lang.Object clone()

Clones this object.

Overrides:

clone in class java.security.MessageDigestSpi

Throws:

FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.

internalClone

public java.lang.Object internalClone()

Clones this object.