demo.cms.digestedData
Class DigestedDataDemo

java.lang.Object
  demo.cms.digestedData.DigestedDataDemo

public class DigestedDataDemo
extends java.lang.Object

Demonstrates the usage of class DigestedDataStream and DigestedData for digesting data using the CMS type DigestedData.

Constructor Summary

DigestedDataDemo()
Default constructor.

Method Summary

byte[]	createDigestedData(byte[] message, int mode) Creates a CMS DigestedData object.
byte[]	createDigestedDataStream(byte[] message, int mode) Creates a CMS DigestedData object.
byte[]	getDigestedData(byte[] encoding, byte[] message) Parses a CMS DigestedData object and verifies the hash value.
byte[]	getDigestedDataStream(byte[] digestedData, byte[] message) Parses a CMS DigestedData object and verifies the hash.
static void	main(java.lang.String[] argv) Main method.
void	start() Starts the tests.

Methods inherited from class java.lang.Object

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

Constructor Detail

DigestedDataDemo

public DigestedDataDemo()
                 throws java.io.IOException

Default constructor.

Throws:

java.io.IOException

Method Detail

createDigestedDataStream

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

Creates a CMS DigestedData object.

Parameters:

message - the message to be digested, as byte representation

mode - IMPLICIT (include message) or EXPLICIT (do not include message)

Returns:

the DER encoding of the DigestedData object just created

Throws:

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

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

getDigestedDataStream

public byte[] getDigestedDataStream(byte[] digestedData,
                                    byte[] message)
                             throws iaik.cms.CMSException,
                                    java.io.IOException

Parses a CMS DigestedData object and verifies the hash.

Parameters:

digestedData - DigestedData object as DER encoded byte array

message - the the message which was transmitted out-of-band

Returns:

the inherent message as byte array

Throws:

iaik.cms.CMSException - if some parsing error occurs or the hash verification fails

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

createDigestedData

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

Creates a CMS DigestedData object.

Parameters:

message - the message to be digested, as byte representation

mode - IMPLICIT (include message) or EXPLICIT (do not include message)

Returns:

the DER encoded DigestedData

Throws:

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

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

getDigestedData

public byte[] getDigestedData(byte[] encoding,
                              byte[] message)
                       throws iaik.cms.CMSException,
                              java.io.IOException

Parses a CMS DigestedData object and verifies the hash value.

Parameters:

encoding - the DER encoded DigestedData object

message - the the message which was transmitted out-of-band (explicit digested)

Returns:

the message

Throws:

iaik.cms.CMSException - if some parsing error occurs or the hash verification fails

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

start

public void start()

Starts the tests.

main

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

Main method.

Throws:

java.lang.Exception