org.bouncycastle.crypto.digests
Class SHA256Digest

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

All Implemented Interfaces:

Digest, ExtendedDigest

public class SHA256Digest
extends GeneralDigest

FIPS 180-2 implementation of SHA-256.

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

Field Summary

private static int	DIGEST_LENGTH
private int	H1
private int	H2
private int	H3
private int	H4
private int	H5
private int	H6
private int	H7
private int	H8
(package private) static int[]	K
private int[]	X
private int	xOff

Constructor Summary

SHA256Digest()
Standard constructor

SHA256Digest(SHA256Digest t)
Copy constructor.

Method Summary

private int	Ch(int x, int y, int z)
int	doFinal(byte[] out, int outOff) close the digest, producing the final digest value.
java.lang.String	getAlgorithmName() return the algorithm name
int	getDigestSize() return the size, in bytes, of the digest produced by this message digest.
private int	Maj(int x, int y, int z)
protected void	processBlock()
protected void	processLength(long bitLength)
protected void	processWord(byte[] in, int inOff)
void	reset() reset the chaining variables
private int	Sum0(int x)
private int	Sum1(int x)
private int	Theta0(int x)
private int	Theta1(int x)
private void	unpackWord(int word, byte[] out, int outOff)

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

finish, getByteLength, update, update

Methods inherited from class java.lang.Object

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

Field Detail

DIGEST_LENGTH

private static final int DIGEST_LENGTH

See Also:

Constant Field Values

H1

private int H1

H2

private int H2

H3

private int H3

H4

private int H4

H5

private int H5

H6

private int H6

H7

private int H7

H8

private int H8

X

private int[] X

xOff

private int xOff

K

static final int[] K

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 java.lang.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

unpackWord

private void unpackWord(int word,
                        byte[] out,
                        int outOff)

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

Ch

private int Ch(int x,
               int y,
               int z)

Maj

private int Maj(int x,
                int y,
                int z)

Sum0

private int Sum0(int x)

Sum1

private int Sum1(int x)

Theta0

private int Theta0(int x)

Theta1

private int Theta1(int x)