galileo.util

Class Checksum

java.lang.Object

galileo.util.Checksum

public class Checksum
extends java.lang.Object

Provides convenience functions for dealing with MessageDigest algorithms.

Author:

malensek

Constructor Summary

Constructors

Constructor and Description
Checksum() Initializes a new Checksum generator using the default SHA-1 algorithm.
Checksum(java.lang.String algorithm) Initializes a new Checksum generator using the specified algorithm.

Method Summary

Modifier and Type	Method and Description
java.security.MessageDigest	getMessageDigest() Retrieves the MessageDigest instance used by this Checksum generator.
byte[]	hash(byte[] bytes) Produce a checksum/hashsum of a given block of data.
java.lang.String	hashToHexString(byte[] hash) Convert a hash to a hexidecimal String.

Methods inherited from class java.lang.Object

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

Constructor Detail

Checksum

public Checksum()

Initializes a new Checksum generator using the default SHA-1 algorithm.

Checksum

public Checksum(java.lang.String algorithm)
         throws java.security.NoSuchAlgorithmException

Initializes a new Checksum generator using the specified algorithm.

Parameters:

algorithm - algorithm to use to generate checksums.

Throws:

java.security.NoSuchAlgorithmException

Method Detail

hash

public byte[] hash(byte[] bytes)

Produce a checksum/hashsum of a given block of data.

Parameters:

bytes - data bytes to checksum.

Returns:

checksum as a byte array.

hashToHexString

public java.lang.String hashToHexString(byte[] hash)

Convert a hash to a hexidecimal String.

Parameters:

hash - the hash value to convert

Returns:

zero-padded hex String representation of the hash.

getMessageDigest

public java.security.MessageDigest getMessageDigest()

Retrieves the MessageDigest instance used by this Checksum generator.

Returns:

the Checksum instance MessageDigest.