org.bouncycastle.crypto.digests
Class MD5Digest

java.lang.Object
  org.bouncycastle.crypto.digests.GeneralDigest
      org.bouncycastle.crypto.digests.MD5Digest

All Implemented Interfaces:

Digest, ExtendedDigest

public class MD5Digest
extends GeneralDigest

implementation of MD5 as outlined in "Handbook of Applied Cryptography", pages 346 - 347.

Field Summary

private static int	DIGEST_LENGTH
private int	H1
private int	H2
private int	H3
private int	H4
private static int	S11
private static int	S12
private static int	S13
private static int	S14
private static int	S21
private static int	S22
private static int	S23
private static int	S24
private static int	S31
private static int	S32
private static int	S33
private static int	S34
private static int	S41
private static int	S42
private static int	S43
private static int	S44
private int[]	X
private int	xOff

Constructor Summary

MD5Digest()
Standard constructor

MD5Digest(MD5Digest t)
Copy constructor.

Method Summary

int	doFinal(byte[] out, int outOff) close the digest, producing the final digest value.
private int	F(int u, int v, int w)
private int	G(int u, int v, int w)
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	H(int u, int v, int w)
private int	K(int u, int v, int w)
protected void	processBlock()
protected void	processLength(long bitLength)
protected void	processWord(byte[] in, int inOff)
void	reset() reset the chaining variables to the IV values.
private int	rotateLeft(int x, int n)
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

X

private int[] X

xOff

private int xOff

S11

private static final int S11

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Constant Field Values

S12

private static final int S12

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Constant Field Values

S13

private static final int S13

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Constant Field Values

S14

private static final int S14

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Constant Field Values

S21

private static final int S21

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Constant Field Values

S22

private static final int S22

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Constant Field Values

S23

private static final int S23

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Constant Field Values

S24

private static final int S24

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Constant Field Values

S31

private static final int S31

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Constant Field Values

S32

private static final int S32

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Constant Field Values

S33

private static final int S33

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Constant Field Values

S34

private static final int S34

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Constant Field Values

S41

private static final int S41

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Constant Field Values

S42

private static final int S42

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Constant Field Values

S43

private static final int S43

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Constant Field Values

S44

private static final int S44

See Also:

Constant Field Values

Constructor Detail

MD5Digest

public MD5Digest()

Standard constructor

MD5Digest

public MD5Digest(MD5Digest 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

processLength

protected void processLength(long bitLength)

Specified by:

processLength in class GeneralDigest

unpackWord

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

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 to the IV values.

Specified by:

reset in interface Digest

Overrides:

reset in class GeneralDigest

rotateLeft

private int rotateLeft(int x,
                       int n)

F

private int F(int u,
              int v,
              int w)

G

private int G(int u,
              int v,
              int w)

H

private int H(int u,
              int v,
              int w)

K

private int K(int u,
              int v,
              int w)

processBlock

protected void processBlock()

Specified by:

processBlock in class GeneralDigest