org.bouncycastle.crypto.digests
Class LongDigest

java.lang.Object
  org.bouncycastle.crypto.digests.LongDigest

All Implemented Interfaces:

Digest, ExtendedDigest

Direct Known Subclasses:

SHA384Digest, SHA512Digest

public abstract class LongDigest
extends java.lang.Object
implements ExtendedDigest

Base class for SHA-384 and SHA-512.

Field Summary

private static int	BYTE_LENGTH
private long	byteCount1
private long	byteCount2
protected long	H1
protected long	H2
protected long	H3
protected long	H4
protected long	H5
protected long	H6
protected long	H7
protected long	H8
(package private) static long[]	K
private long[]	W
private int	wOff
private byte[]	xBuf
private int	xBufOff

Constructor Summary

protected	LongDigest() Constructor for variable length word
protected	LongDigest(LongDigest t) Copy constructor.

Method Summary

private void	adjustByteCounts() adjust the byte counts so that byteCount2 represents the upper long (less 3 bits) word of the byte count.
private long	Ch(long x, long y, long z)
void	finish()
int	getByteLength() Return the size in bytes of the internal buffer the digest applies it's compression function to.
private long	Maj(long x, long y, long z)
protected void	processBlock()
protected void	processLength(long lowW, long hiW)
protected void	processWord(byte[] in, int inOff)
void	reset() reset the digest back to it's initial state.
private long	Sigma0(long x)
private long	Sigma1(long x)
private long	Sum0(long x)
private long	Sum1(long x)
protected void	unpackWord(long word, byte[] out, int outOff)
void	update(byte in) update the message digest with a single byte.
void	update(byte[] in, int inOff, int len) update the message digest with a block of bytes.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.bouncycastle.crypto.Digest

doFinal, getAlgorithmName, getDigestSize

Field Detail

BYTE_LENGTH

private static final int BYTE_LENGTH

See Also:

Constant Field Values

xBuf

private byte[] xBuf

xBufOff

private int xBufOff

byteCount1

private long byteCount1

byteCount2

private long byteCount2

H1

protected long H1

H2

protected long H2

H3

protected long H3

H4

protected long H4

H5

protected long H5

H6

protected long H6

H7

protected long H7

H8

protected long H8

W

private long[] W

wOff

private int wOff

K

static final long[] K

Constructor Detail

LongDigest

protected LongDigest()

Constructor for variable length word

LongDigest

protected LongDigest(LongDigest t)

Copy constructor. We are using copy constructors in place of the Object.clone() interface as this interface is not supported by J2ME.

Method Detail

update

public void update(byte in)

Description copied from interface: Digest

update the message digest with a single byte.

Specified by:

update in interface Digest

Parameters:

in - the input byte to be entered.

update

public void update(byte[] in,
                   int inOff,
                   int len)

Description copied from interface: Digest

update the message digest with a block of bytes.

Specified by:

update in interface Digest

Parameters:

in - the byte array containing the data.

inOff - the offset into the byte array where the data starts.

len - the length of the data.

finish

public void finish()

reset

public void reset()

Description copied from interface: Digest

reset the digest back to it's initial state.

Specified by:

reset in interface Digest

getByteLength

public int getByteLength()

Description copied from interface: ExtendedDigest

Return the size in bytes of the internal buffer the digest applies it's compression function to.

Specified by:

getByteLength in interface ExtendedDigest

Returns:

byte length of the digests internal buffer.

processWord

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

unpackWord

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

adjustByteCounts

private void adjustByteCounts()

adjust the byte counts so that byteCount2 represents the upper long (less 3 bits) word of the byte count.

processLength

protected void processLength(long lowW,
                             long hiW)

processBlock

protected void processBlock()

Ch

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

Maj

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

Sum0

private long Sum0(long x)

Sum1

private long Sum1(long x)

Sigma0

private long Sigma0(long x)

Sigma1

private long Sigma1(long x)