dgs.tlkt.demo
Class VerifySignature

java.lang.Object
  dgs.tlkt.demo.VerifySignature

public class VerifySignature

extends java.lang.Object

Verify that the time stamp for a particular file is authentic.

This source code is include with the SecureTime toolkit distribution.

This includes calculating the file's hash and using the public key certificate to verify the signature

Verify the signature using the RSA capabilities delivered with the VM.

Field Summary

java.io.PrintStream	myOut where should the output go.
boolean	verbose detailed output ?

Constructor Summary

VerifySignature()
Create a processing instance.

VerifySignature(boolean verbose, java.io.PrintStream myOut)

Method Summary

java.security.cert.X509Certificate	findCertInFile(CMSTsToken cms)
static void	main(java.lang.String[] args)
java.security.cert.X509Certificate	verifySignature(CMSTsToken cms) Verify the signature using the RSA capabilities delivered with the VM.
java.security.cert.X509Certificate	verifySignature(java.lang.String timestampedFile, CMSTsToken timeStamp) Demonstrate the core steps in verifying the time stamp token.
java.security.cert.X509Certificate	verifyTSofFile(java.lang.String timestampedFile, java.lang.String timestamp) Give a file that was time stamped and a time stamp.

Methods inherited from class java.lang.Object

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

Field Detail

myOut

public java.io.PrintStream myOut

where should the output go. Default is "System.out".

verbose

public boolean verbose

detailed output ? default = false

Constructor Detail

VerifySignature

public VerifySignature()

Create a processing instance.

See Also:

verifySignature(String, CMSTsToken)

VerifySignature

public VerifySignature(boolean verbose,
                       java.io.PrintStream myOut)

Parameters:

verbose -

myOut -

Method Detail

findCertInFile

public java.security.cert.X509Certificate findCertInFile(CMSTsToken cms)
                                                  throws ExceptionDgsEncode,
                                                         java.security.cert.CertificateException,
                                                         java.io.FileNotFoundException

Throws:

ExceptionDgsEncode

java.security.cert.CertificateException

java.io.FileNotFoundException

main

public static void main(java.lang.String[] args)

verifySignature

public java.security.cert.X509Certificate verifySignature(CMSTsToken cms)
                                                   throws java.security.NoSuchAlgorithmException,
                                                          ExceptionDgsEncode,
                                                          java.security.cert.CertificateException,
                                                          java.io.FileNotFoundException,
                                                          java.security.InvalidKeyException,
                                                          java.security.SignatureException

Verify the signature using the RSA capabilities delivered with the VM.

Steps:
1. find the public key based on its identifier
2. check the signature of signed attributes

If the verify process is successful then it returns the x509 certificate that was used. Otherwise, returns null.

Throws:

java.security.NoSuchAlgorithmException

ExceptionDgsEncode

java.security.cert.CertificateException

java.io.FileNotFoundException

java.security.InvalidKeyException

java.security.SignatureException

verifySignature

public java.security.cert.X509Certificate verifySignature(java.lang.String timestampedFile,
                                                          CMSTsToken timeStamp)
                                                   throws java.security.InvalidKeyException,
                                                          ExceptionDgsEncode,
                                                          java.security.cert.CertificateException,
                                                          java.security.SignatureException,
                                                          java.security.NoSuchAlgorithmException,
                                                          java.io.IOException

Demonstrate the core steps in verifying the time stamp token. Verify the signature using the RSA capabilities delivered with the VM.

Steps:
1. check that the hash of the data is in TSTInfo
2. check that the hash of TSTInfo is in signedAttibutes
3. find the public key based on its identifier
4. check the signature of signed attributes

If the verify process is successful then it returns the x509 certificate that was used. Otherwise, returns null.

Parameters:

timestampedFile - - file name of the data that was time stamped

timeStamp - - the time stamp object

Throws:

java.security.InvalidKeyException

ExceptionDgsEncode

java.security.cert.CertificateException

java.security.SignatureException

java.security.NoSuchAlgorithmException

java.io.IOException

verifyTSofFile

public java.security.cert.X509Certificate verifyTSofFile(java.lang.String timestampedFile,
                                                         java.lang.String timestamp)
                                                  throws java.security.InvalidKeyException,
                                                         java.security.cert.CertificateException,
                                                         java.security.SignatureException,
                                                         java.security.NoSuchAlgorithmException,
                                                         java.io.IOException

Give a file that was time stamped and a time stamp. Is the time stamp valid for that file.

If the verify process is successful then it returns the x509 certificate that was used. Otherwise, returns null.

Parameters:

timestampedFile - - file name of the data that was time stamped

timestamp - - file name where the time stamp is stored

Returns:

X509Certificate

Throws:

java.security.InvalidKeyException

java.security.cert.CertificateException

java.security.SignatureException

java.security.NoSuchAlgorithmException

java.io.IOException

See Also:

for more details