Package eu.europa.esig.dss.spi

Class DSSMessageDigestCalculator

java.lang.Object

eu.europa.esig.dss.spi.DSSMessageDigestCalculator

public class DSSMessageDigestCalculator
extends Object

This class is used to compute DSSMessageDigest based on the provided input

Constructor Summary

Constructors

Constructor	Description
DSSMessageDigestCalculator(DigestAlgorithm digestAlgorithm)	Default constructor with a single digest algorithm
DSSMessageDigestCalculator(Collection<DigestAlgorithm> digestAlgorithms)	Constructor with multiple digest algorithms

Method Summary

Modifier and Type	Method	Description
DSSMessageDigest	getMessageDigest()	Deprecated. since DSS 6.3.
DSSMessageDigest	getMessageDigest(DigestAlgorithm digestAlgorithm)	Returns the DSSMessageDigest accordingly to the given digestAlgorithm This method resets the state of message-digest.
OutputStream	getOutputStream()	Gets OutputStream that can be used to calculate digest on the fly.
OutputStream	getOutputStream(OutputStream outputStream)	Gets OutputStream that can be used to calculate digest on the fly.
void	update(byte byteToAdd)	Updates the digest using the provided byte
void	update(byte[] bytes)	Updates the digest using the provided array of bytes
void	update(byte[] bytes, int offset, int length)	Updates the bytes starting from the offset and a specified length
void	update(InputStream inputStream)	Updates the digest by reading the provided InputStream.

Methods inherited from class java.lang.Object

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

Constructor Details

DSSMessageDigestCalculator

public DSSMessageDigestCalculator(DigestAlgorithm digestAlgorithm)

Default constructor with a single digest algorithm

Parameters:

digestAlgorithm - DigestAlgorithm to be used for message-digest computation

DSSMessageDigestCalculator

public DSSMessageDigestCalculator(Collection<DigestAlgorithm> digestAlgorithms)

Constructor with multiple digest algorithms

Parameters:

digestAlgorithms - DigestAlgorithm to be used for message-digest computation

Method Details

update

public void update(byte byteToAdd)

Updates the digest using the provided byte

Parameters:

byteToAdd - byte to be added for digest computation

update

public void update(byte[] bytes)

Updates the digest using the provided array of bytes

Parameters:

bytes - array of bytes

update

public void update(byte[] bytes,
 int offset,
 int length)

Updates the bytes starting from the offset and a specified length

Parameters:

bytes - array of bytes

offset - to start bytes update from

length - the length of bytes array to be updated

update

public void update(InputStream inputStream)
            throws IOException

Updates the digest by reading the provided InputStream. NOTE: the method consumes the InputStream, and closes it after.

Parameters:

inputStream - InputStream

Throws:

IOException - if an error is thrown on InputStream reading

getMessageDigest

@Deprecated
public DSSMessageDigest getMessageDigest()

Deprecated.

since DSS 6.3. Please use #getMessageDigest(DigestAlgorithm) method instead.

Returns the DSSMessageDigest accordingly to the current state. This method resets the state of message-digest.

Returns:

DSSMessageDigest

getMessageDigest

public DSSMessageDigest getMessageDigest(DigestAlgorithm digestAlgorithm)

Returns the DSSMessageDigest accordingly to the given digestAlgorithm This method resets the state of message-digest.

Parameters:

digestAlgorithm - DigestAlgorithm to get a corresponding DSSMessageDigest for

Returns:

DSSMessageDigest

getOutputStream

public OutputStream getOutputStream()

Gets OutputStream that can be used to calculate digest on the fly. This method will update the digest within the current instance of DSSMessageDigestCalculator, when the returned OutputStream is being updated.

Returns:

OutputStream

getOutputStream

public OutputStream getOutputStream(OutputStream outputStream)

Gets OutputStream that can be used to calculate digest on the fly. This method will write the binaries into the provided outputStream as well as will update the digest within the current instance of DSSMessageDigestCalculator

Parameters:

outputStream - to be embedded into

Returns:

OutputStream