demo.cms.compressedData
Class CompressedDataDemo

java.lang.Object
  demo.cms.compressedData.CompressedDataDemo

public class CompressedDataDemo
extends java.lang.Object

Demonstrates the usage of class CompressedDataStream and CompressedData for compressing/decompressing data using the CMS type CompressedData.

Constructor Summary

CompressedDataDemo()
Default constructor.

Method Summary

byte[]	createCompressedData(byte[] message, int mode) Creates a CMS CompressedData object.
byte[]	createCompressedDataStream(byte[] message, int mode) Creates a CMS CompressedData object.
byte[]	getCompressedData(byte[] encoding, byte[] compressedContent) Parses a CMS CompressedData object.
byte[]	getCompressedDataStream(byte[] encoding, byte[] compressedContent) Parses a CMS CompressedData object.
static void	main(java.lang.String[] argv) Main method.
void	start() Starts the demo.

Methods inherited from class java.lang.Object

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

Constructor Detail

CompressedDataDemo

public CompressedDataDemo()

Default constructor.

Method Detail

createCompressedDataStream

public byte[] createCompressedDataStream(byte[] message,
                                         int mode)
                                  throws iaik.cms.CMSException,
                                         java.io.IOException,
                                         java.security.NoSuchAlgorithmException

Creates a CMS CompressedData object.

Parameters:

message - the message to be compressed, as byte representation

mode - IMPLICIT (include compressed content) or EXPLICIT (do not include compressed content)

Returns:

the BER encoding of the CompressedData object just created

Throws:

iaik.cms.CMSException - if the CompressedData object cannot be created

java.io.IOException - if an I/O error occurs

java.security.NoSuchAlgorithmException - if the compression algorithm is not supported

getCompressedDataStream

public byte[] getCompressedDataStream(byte[] encoding,
                                      byte[] compressedContent)
                               throws iaik.cms.CMSException,
                                      java.io.IOException,
                                      java.security.NoSuchAlgorithmException

Parses a CMS CompressedData object.

Parameters:

encoding - the CompressedData object as BER encoded byte array

compressedContent - the compressed content which was transmitted out-of-band

Returns:

the decompressed message as byte array

Throws:

iaik.cms.CMSException - if the CompressedData cannot be parsed

java.io.IOException - if an I/O error occurs

java.security.NoSuchAlgorithmException - if the compression algorithm is not supported

createCompressedData

public byte[] createCompressedData(byte[] message,
                                   int mode)
                            throws iaik.cms.CMSException,
                                   java.io.IOException,
                                   java.security.NoSuchAlgorithmException

Creates a CMS CompressedData object.

Parameters:

message - the message to be compressed, as byte representation

mode - IMPLICIT (include the compressed content) or EXPLICIT (do not include the compressed content)

Returns:

the DER encoded CompressedData

Throws:

iaik.cms.CMSException - if the CompressedData object cannot be created

java.io.IOException - if an I/O error occurs

java.security.NoSuchAlgorithmException - if the compression algorithm is not supported

getCompressedData

public byte[] getCompressedData(byte[] encoding,
                                byte[] compressedContent)
                         throws iaik.cms.CMSException,
                                java.io.IOException,
                                java.security.NoSuchAlgorithmException

Parses a CMS CompressedData object.

Parameters:

encoding - the DER encoded CompressedData object

compressedContent - the compressed content which was transmitted out-of-band

Returns:

the decompressed message as byte array

Throws:

iaik.cms.CMSException - if the CompressedData cannot be parsed

java.io.IOException - if an I/O error occurs

java.security.NoSuchAlgorithmException - if the compression algorithm is not supported

start

public void start()

Starts the demo.

main

public static void main(java.lang.String[] argv)
                 throws java.lang.Exception

Main method.

Throws:

java.lang.Exception