org.gudy.bouncycastle.crypto.digests
Class SHA256Digest

java.lang.Object
  org.gudy.bouncycastle.crypto.digests.GeneralDigest
      org.gudy.bouncycastle.crypto.digests.SHA256Digest

All Implemented Interfaces:

Digest

public class SHA256Digest
extends GeneralDigest

Draft FIPS 180-2 implementation of SHA-256. Note: As this is based on a draft this implementation is subject to change.

         block  word  digest
 SHA-1   512    32    160
 SHA-256 512    32    256
 SHA-384 1024   64    384
 SHA-512 1024   64    512
 

Constructor Summary

SHA256Digest()
Standard constructor

SHA256Digest(SHA256Digest t)
Copy constructor.

Method Summary

int	doFinal(byte[] out, int outOff) close the digest, producing the final digest value.
String	getAlgorithmName() return the algorithm name
int	getDigestSize() return the size, in bytes, of the digest produced by this message digest.
protected void	processBlock()
protected void	processLength(long bitLength)
protected void	processWord(byte[] in, int inOff)
void	reset() reset the chaining variables

Methods inherited from class org.gudy.bouncycastle.crypto.digests.GeneralDigest

finish, update, update

Methods inherited from class java.lang.Object

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

Constructor Detail

SHA256Digest

public SHA256Digest()

Standard constructor

SHA256Digest

public SHA256Digest(SHA256Digest t)

Copy constructor. This will copy the state of the provided message digest.

Method Detail

getAlgorithmName

public String getAlgorithmName()

Description copied from interface: Digest

return the algorithm name

Returns:

the algorithm name

getDigestSize

public int getDigestSize()

Description copied from interface: Digest

return the size, in bytes, of the digest produced by this message digest.

Returns:

the size, in bytes, of the digest produced by this message digest.

processWord

protected void processWord(byte[] in,
                           int inOff)

Specified by:

processWord in class GeneralDigest

processLength

protected void processLength(long bitLength)

Specified by:

processLength in class GeneralDigest

doFinal

public int doFinal(byte[] out,
                   int outOff)

Description copied from interface: Digest

close the digest, producing the final digest value. The doFinal call leaves the digest reset.

Parameters:

out - the array the digest is to be copied into.

outOff - the offset into the out array the digest is to start at.

reset

public void reset()

reset the chaining variables

Specified by:

reset in interface Digest

Overrides:

reset in class GeneralDigest

processBlock

protected void processBlock()

Specified by:

processBlock in class GeneralDigest