com.digistamp.tsp.demo

Class VerifyTimestamp

Object

com.digistamp.tsp.demo.VerifyTimestamp

public class VerifyTimestamp
extends Object

Verifying a timestamp and either displaying its hash value, or confirming it against the protected file, and displaying the protected time. No Internet communications occur during this process.

This source code is include with the SecureTime Java API distribution.

Given a file name, the process performs:

1. read the timestamp provided
2. verify the provided timestamp signature
3. display the protected hash value in HEX encoding
4. verify any provided protected file against this hash value
5. provide the protected time in the timestamp with relevant statement about the authenticity of any protected file

Version:

4.1

Author:

Copyright © 2015 DigiStamp

Field Summary

Fields

Modifier and Type	Field and Description
TSAservice	theTSAservice you can use as singleton because this is thread safe.

Constructor Summary

Constructors

Constructor and Description
VerifyTimestamp()

Method Summary

Modifier and Type	Method and Description
static void	main(String[] args) Execute the demo from a command line.
static void	testValidateAllTokens(org.bouncycastle.tsp.cms.CMSTimeStampedData cmsTimeStampedData) Does the hash of the content data match what is recorded in the timestamp? Calculate the digest / hash value of the "protect data (content)".
void	validate(org.bouncycastle.tsp.TimeStampToken aTimestamp, FileInputStream theProtectedData) Do all validations
void	validateDigestValue(org.bouncycastle.tsp.TimeStampToken aTimestamp, FileInputStream theProtectedData) Does the provided timestamp contain the hash of the provided "protected data"? Throw an exception if any issues.

Methods inherited from class Object

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

Field Detail

theTSAservice

public TSAservice theTSAservice

you can use as singleton because this is thread safe.

Constructor Detail

VerifyTimestamp

public VerifyTimestamp()

Method Detail

main

public static void main(String[] args)

Execute the demo from a command line. Enter:

1. input file name that will be time stamped
2. (optionally) the work "true" if you want a demonstrate verifying an existing timestamp.

See Also:

for details

testValidateAllTokens

public static void testValidateAllTokens(org.bouncycastle.tsp.cms.CMSTimeStampedData cmsTimeStampedData)
                                  throws org.bouncycastle.operator.OperatorCreationException,
                                         IOException,
                                         org.bouncycastle.cms.CMSException,
                                         org.bouncycastle.tsp.cms.ImprintDigestInvalidException

Does the hash of the content data match what is recorded in the timestamp? Calculate the digest / hash value of the "protect data (content)". Use the digest method defined in the timestamp. from: org.bouncycastle.tsp.testCMSTimeStampedDataTest

Throws:

org.bouncycastle.operator.OperatorCreationException

IOException

org.bouncycastle.cms.CMSException

org.bouncycastle.tsp.cms.ImprintDigestInvalidException

validate

public void validate(org.bouncycastle.tsp.TimeStampToken aTimestamp,
                     FileInputStream theProtectedData)
              throws org.bouncycastle.cms.CMSException,
                     org.bouncycastle.operator.OperatorCreationException,
                     IOException,
                     org.bouncycastle.tsp.cms.ImprintDigestInvalidException

Do all validations

Throws:

org.bouncycastle.cms.CMSException

org.bouncycastle.operator.OperatorCreationException

IOException

org.bouncycastle.tsp.cms.ImprintDigestInvalidException

validateDigestValue

public void validateDigestValue(org.bouncycastle.tsp.TimeStampToken aTimestamp,
                                FileInputStream theProtectedData)
                         throws org.bouncycastle.cms.CMSException,
                                org.bouncycastle.operator.OperatorCreationException,
                                IOException,
                                org.bouncycastle.tsp.cms.ImprintDigestInvalidException

Does the provided timestamp contain the hash of the provided "protected data"? Throw an exception if any issues.

Throws:

org.bouncycastle.cms.CMSException

org.bouncycastle.operator.OperatorCreationException

IOException

org.bouncycastle.tsp.cms.ImprintDigestInvalidException