demo.cms.digestedData

Class DigestedDataOutputStreamDemo

java.lang.Object

demo.cms.digestedData.DigestedDataOutputStreamDemo

public class DigestedDataOutputStreamDemo
extends java.lang.Object

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

Constructor Summary

Constructors

Constructor and Description
DigestedDataOutputStreamDemo() Default constructor.

Method Summary

Modifier and Type	Method and Description
byte[]	createDigestedData(byte[] message, int mode) Uses the IAIK-CMS DigestedDataOutputStream class to create a CMS DigestedData object for digesting the given message.
byte[]	getDigestedData(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

DigestedDataOutputStreamDemo

public DigestedDataOutputStreamDemo()
                             throws java.io.IOException

Default constructor.

Throws:

java.io.IOException

Method Detail

createDigestedData

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

Uses the IAIK-CMS DigestedDataOutputStream class to create a CMS DigestedData object for digesting the given message.

Parameters:

message - the message to be digested, as byte representation

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

Returns:

the BER encoding of the DigestedData object just created, wrapped in a ContentInfo

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

Parses a CMS DigestedData object and verifies the hash.

Parameters:

digestedData - DigestedData object as BER encoded byte array

message - the message which may have been 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

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