com.absio.crypto.digest

Class MessageDigestHelper

java.lang.Object

com.absio.crypto.digest.MessageDigestHelper

public class MessageDigestHelper
extends Object

Use this helper class to assist with message digest operations (hashing). It uses the JCE MessageDigest class to perform the hashing. The helper works with a set MessageDigestAlgorithm which is defined at creation.

Constructor Summary

Constructors

Constructor and Description
MessageDigestHelper() Create a helper with the MessageDigestAlgorithm.DEFAULT algorithm.
MessageDigestHelper(MessageDigestAlgorithm algorithm) Create a helper with the given MessageDigestAlgorithm algorithm.

Method Summary

Modifier and Type	Method and Description
byte[]	digest(byte[] data) Gets the digest of the data (the hash) using the helper's defined algorithm.
int	getDigestLength() Get the length of the digest (the hash) according to the helper's defined algorithm.

Methods inherited from class java.lang.Object

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

Constructor Detail

MessageDigestHelper

public MessageDigestHelper()
                    throws NoSuchAlgorithmException

Create a helper with the MessageDigestAlgorithm.DEFAULT algorithm.

Throws:

NoSuchAlgorithmException - thrown if the algorithm is not supported

MessageDigestHelper

public MessageDigestHelper(MessageDigestAlgorithm algorithm)
                    throws NoSuchAlgorithmException

Create a helper with the given MessageDigestAlgorithm algorithm.

Parameters:

algorithm - the algorithm for the helper

Throws:

NoSuchAlgorithmException - thrown if the algorithm is not supported

Method Detail

digest

public byte[] digest(byte[] data)

Gets the digest of the data (the hash) using the helper's defined algorithm.

Parameters:

data - the data to compute the digest (to hash)

Returns:

the digest of the data (the hash)

getDigestLength

public int getDigestLength()

Get the length of the digest (the hash) according to the helper's defined algorithm.

Returns:

the length of the digest (the hash)