com.mucommander.io.security
Class ChecksumMessageDigest

java.lang.Object
  java.security.MessageDigestSpi
      java.security.MessageDigest
          com.mucommander.io.security.ChecksumMessageDigest

Direct Known Subclasses:

Adler32MessageDigest, CRC32MessageDigest

public class ChecksumMessageDigest
extends java.security.MessageDigest

This class turns a java.util.zip.Checksum into a java.security.MessageDigest, allowing Checksum implementations to be used with the Java Cryptography Extension.

Author:

Maxence Bernard

Constructor Summary

ChecksumMessageDigest(java.util.zip.Checksum checksum, java.lang.String algorithm)
Creates a new ChecksumMessageDigest that delegates all the checksumming work to the given Checksum instance.

Method Summary

protected byte[]	engineDigest() This method delegates to the underlying java.util.zip.Checksum instance.
protected void	engineReset() This method delegates to the underlying java.util.zip.Checksum instance.
protected void	engineUpdate(byte input) This method delegates to the underlying java.util.zip.Checksum instance.
protected void	engineUpdate(byte[] input, int offset, int len) This method delegates to the underlying java.util.zip.Checksum instance.

Methods inherited from class java.security.MessageDigest

clone, digest, digest, digest, getAlgorithm, getDigestLength, getInstance, getInstance, getInstance, getProvider, isEqual, reset, toString, update, update, update, update

Methods inherited from class java.security.MessageDigestSpi

engineDigest, engineGetDigestLength, engineUpdate

Methods inherited from class java.lang.Object

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

Constructor Detail

ChecksumMessageDigest

public ChecksumMessageDigest(java.util.zip.Checksum checksum,
                             java.lang.String algorithm)

Creates a new ChecksumMessageDigest that delegates all the checksumming work to the given Checksum instance.

Parameters:

checksum - the Checksum responsible for calculating the checksum

algorithm - the name of the checksum algorithm implemented by the Checksum

Method Detail

engineReset

protected void engineReset()

This method delegates to the underlying java.util.zip.Checksum instance.

Specified by:

engineReset in class java.security.MessageDigestSpi

engineUpdate

protected void engineUpdate(byte input)

This method delegates to the underlying java.util.zip.Checksum instance.

Specified by:

engineUpdate in class java.security.MessageDigestSpi

engineUpdate

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

This method delegates to the underlying java.util.zip.Checksum instance.

Specified by:

engineUpdate in class java.security.MessageDigestSpi

engineDigest

protected byte[] engineDigest()

This method delegates to the underlying java.util.zip.Checksum instance.

Specified by:

engineDigest in class java.security.MessageDigestSpi