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The Bouncy Castle Java API for handling the Time Stamp Protocol (TSP). This jar contains the TSP API for JDK 1.6. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.tsp;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.cert.CertStore;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateExpiredException;
import java.security.cert.CertificateNotYetValidException;
import java.security.cert.X509Certificate;
import java.util.Collection;
import java.util.Date;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.cms.Attribute;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.cms.IssuerAndSerialNumber;
import org.bouncycastle.asn1.ess.ESSCertID;
import org.bouncycastle.asn1.ess.ESSCertIDv2;
import org.bouncycastle.asn1.ess.SigningCertificate;
import org.bouncycastle.asn1.ess.SigningCertificateV2;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.tsp.TSTInfo;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.IssuerSerial;
import org.bouncycastle.asn1.x509.X509Name;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSProcessable;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.SignerId;
import org.bouncycastle.cms.SignerInformation;
import org.bouncycastle.cms.SignerInformationVerifier;
import org.bouncycastle.jce.PrincipalUtil;
import org.bouncycastle.jce.X509Principal;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Store;

public class TimeStampToken
{
    CMSSignedData tsToken;

    SignerInformation tsaSignerInfo;

    Date genTime;

    TimeStampTokenInfo tstInfo;
    
    CertID   certID;

    public TimeStampToken(ContentInfo contentInfo)
        throws TSPException, IOException
    {
        this(new CMSSignedData(contentInfo));
    }   
    
    public TimeStampToken(CMSSignedData signedData)
        throws TSPException, IOException
    {
        this.tsToken = signedData;

        if (!this.tsToken.getSignedContentTypeOID().equals(PKCSObjectIdentifiers.id_ct_TSTInfo.getId()))
        {
            throw new TSPValidationException("ContentInfo object not for a time stamp.");
        }
        
        Collection signers = tsToken.getSignerInfos().getSigners();

        if (signers.size() != 1)
        {
            throw new IllegalArgumentException("Time-stamp token signed by "
                    + signers.size()
                    + " signers, but it must contain just the TSA signature.");
        }

        tsaSignerInfo = (SignerInformation)signers.iterator().next();

        try
        {
            CMSProcessable content = tsToken.getSignedContent();
            ByteArrayOutputStream bOut = new ByteArrayOutputStream();

            content.write(bOut);

            ASN1InputStream aIn = new ASN1InputStream(new ByteArrayInputStream(bOut.toByteArray()));

            this.tstInfo = new TimeStampTokenInfo(TSTInfo.getInstance(aIn.readObject()));
            
            Attribute   attr = tsaSignerInfo.getSignedAttributes().get(PKCSObjectIdentifiers.id_aa_signingCertificate);

            if (attr != null)
            {
                SigningCertificate    signCert = SigningCertificate.getInstance(attr.getAttrValues().getObjectAt(0));

                this.certID = new CertID(ESSCertID.getInstance(signCert.getCerts()[0]));
            }
            else
            {
                attr = tsaSignerInfo.getSignedAttributes().get(PKCSObjectIdentifiers.id_aa_signingCertificateV2);

                if (attr == null)
                {
                    throw new TSPValidationException("no signing certificate attribute found, time stamp invalid.");
                }

                SigningCertificateV2 signCertV2 = SigningCertificateV2.getInstance(attr.getAttrValues().getObjectAt(0));

                this.certID = new CertID(ESSCertIDv2.getInstance(signCertV2.getCerts()[0]));
            }
        }
        catch (CMSException e)
        {
            throw new TSPException(e.getMessage(), e.getUnderlyingException());
        }
    }

    public TimeStampTokenInfo getTimeStampInfo()
    {
        return tstInfo;
    }

    public SignerId getSID()
    {
        return tsaSignerInfo.getSID();
    }
    
    public AttributeTable getSignedAttributes()
    {
        return tsaSignerInfo.getSignedAttributes();
    }

    public AttributeTable getUnsignedAttributes()
    {
        return tsaSignerInfo.getUnsignedAttributes();
    }

    public CertStore getCertificatesAndCRLs(
        String type,
        String provider)
        throws NoSuchAlgorithmException, NoSuchProviderException, CMSException
    {
        return tsToken.getCertificatesAndCRLs(type, provider);
    }

    public Store getCertificates()
    {
        return tsToken.getCertificates();
    }

    public Store getCRLs()
    {
        return tsToken.getCRLs();
    }

    public Store getAttributeCertificates()
    {
        return tsToken.getAttributeCertificates();
    }

    /**
     * Validate the time stamp token.
     * 

* To be valid the token must be signed by the passed in certificate and * the certificate must be the one referred to by the SigningCertificate * attribute included in the hashed attributes of the token. The * certificate must also have the ExtendedKeyUsageExtension with only * KeyPurposeId.id_kp_timeStamping and have been valid at the time the * timestamp was created. *

*

* A successful call to validate means all the above are true. *

* @deprecated */ public void validate( X509Certificate cert, String provider) throws TSPException, TSPValidationException, CertificateExpiredException, CertificateNotYetValidException, NoSuchProviderException { try { if (!Arrays.constantTimeAreEqual(certID.getCertHash(), MessageDigest.getInstance(certID.getHashAlgorithmName()).digest(cert.getEncoded()))) { throw new TSPValidationException("certificate hash does not match certID hash."); } if (certID.getIssuerSerial() != null) { if (!certID.getIssuerSerial().getSerial().getValue().equals(cert.getSerialNumber())) { throw new TSPValidationException("certificate serial number does not match certID for signature."); } GeneralName[] names = certID.getIssuerSerial().getIssuer().getNames(); X509Principal principal = PrincipalUtil.getIssuerX509Principal(cert); boolean found = false; for (int i = 0; i != names.length; i++) { if (names[i].getTagNo() == 4 && new X509Principal(X509Name.getInstance(names[i].getName())).equals(principal)) { found = true; break; } } if (!found) { throw new TSPValidationException("certificate name does not match certID for signature. "); } } TSPUtil.validateCertificate(cert); cert.checkValidity(tstInfo.getGenTime()); if (!tsaSignerInfo.verify(cert, provider)) { throw new TSPValidationException("signature not created by certificate."); } } catch (CMSException e) { if (e.getUnderlyingException() != null) { throw new TSPException(e.getMessage(), e.getUnderlyingException()); } else { throw new TSPException("CMS exception: " + e, e); } } catch (NoSuchAlgorithmException e) { throw new TSPException("cannot find algorithm: " + e, e); } catch (CertificateEncodingException e) { throw new TSPException("problem processing certificate: " + e, e); } } /** * Validate the time stamp token. *

* To be valid the token must be signed by the passed in certificate and * the certificate must be the one referred to by the SigningCertificate * attribute included in the hashed attributes of the token. The * certificate must also have the ExtendedKeyUsageExtension with only * KeyPurposeId.id_kp_timeStamping and have been valid at the time the * timestamp was created. *

*

* A successful call to validate means all the above are true. *

* * @param sigVerifier the content verifier create the objects required to verify the CMS object in the timestamp. * @throws TSPException if an exception occurs in processing the token. * @throws TSPValidationException if the certificate or signature fail to be valid. * @throws IllegalArgumentException if the sigVerifierProvider has no associated certificate. */ public void validate( SignerInformationVerifier sigVerifier) throws TSPException, TSPValidationException { if (!sigVerifier.hasAssociatedCertificate()) { throw new IllegalArgumentException("verifier provider needs an associated certificate"); } try { X509CertificateHolder certHolder = sigVerifier.getAssociatedCertificate(); DigestCalculator calc = sigVerifier.getDigestCalculator(certID.getHashAlgorithm()); OutputStream cOut = calc.getOutputStream(); cOut.write(certHolder.getEncoded()); cOut.close(); if (!Arrays.constantTimeAreEqual(certID.getCertHash(), calc.getDigest())) { throw new TSPValidationException("certificate hash does not match certID hash."); } if (certID.getIssuerSerial() != null) { IssuerAndSerialNumber issuerSerial = certHolder.getIssuerAndSerialNumber(); if (!certID.getIssuerSerial().getSerial().equals(issuerSerial.getSerialNumber())) { throw new TSPValidationException("certificate serial number does not match certID for signature."); } GeneralName[] names = certID.getIssuerSerial().getIssuer().getNames(); boolean found = false; for (int i = 0; i != names.length; i++) { if (names[i].getTagNo() == 4 && X500Name.getInstance(names[i].getName()).equals(X500Name.getInstance(issuerSerial.getName().getDERObject()))) { found = true; break; } } if (!found) { throw new TSPValidationException("certificate name does not match certID for signature. "); } } TSPUtil.validateCertificate(certHolder); if (!certHolder.isValidOn(tstInfo.getGenTime())) { throw new TSPValidationException("certificate not valid when time stamp created."); } if (!tsaSignerInfo.verify(sigVerifier)) { throw new TSPValidationException("signature not created by certificate."); } } catch (CMSException e) { if (e.getUnderlyingException() != null) { throw new TSPException(e.getMessage(), e.getUnderlyingException()); } else { throw new TSPException("CMS exception: " + e, e); } } catch (IOException e) { throw new TSPException("problem processing certificate: " + e, e); } catch (OperatorCreationException e) { throw new TSPException("unable to create digest: " + e.getMessage(), e); } } /** * Return true if the signature on time stamp token is valid. *

* Note: this is a much weaker proof of correctness than calling validate(). *

* * @param sigVerifier the content verifier create the objects required to verify the CMS object in the timestamp. * @return true if the signature matches, false otherwise. * @throws TSPException if the signature cannot be processed or the provider cannot match the algorithm. */ public boolean isSignatureValid( SignerInformationVerifier sigVerifier) throws TSPException { try { return tsaSignerInfo.verify(sigVerifier); } catch (CMSException e) { if (e.getUnderlyingException() != null) { throw new TSPException(e.getMessage(), e.getUnderlyingException()); } else { throw new TSPException("CMS exception: " + e, e); } } } /** * Return the underlying CMSSignedData object. * * @return the underlying CMS structure. */ public CMSSignedData toCMSSignedData() { return tsToken; } /** * Return a ASN.1 encoded byte stream representing the encoded object. * * @throws IOException if encoding fails. */ public byte[] getEncoded() throws IOException { return tsToken.getEncoded(); } // perhaps this should be done using an interface on the ASN.1 classes... private class CertID { private ESSCertID certID; private ESSCertIDv2 certIDv2; CertID(ESSCertID certID) { this.certID = certID; this.certIDv2 = null; } CertID(ESSCertIDv2 certID) { this.certIDv2 = certID; this.certID = null; } public String getHashAlgorithmName() { if (certID != null) { return "SHA-1"; } else { if (NISTObjectIdentifiers.id_sha256.equals(certIDv2.getHashAlgorithm().getAlgorithm())) { return "SHA-256"; } return certIDv2.getHashAlgorithm().getAlgorithm().getId(); } } public AlgorithmIdentifier getHashAlgorithm() { if (certID != null) { return new AlgorithmIdentifier(OIWObjectIdentifiers.idSHA1); } else { return certIDv2.getHashAlgorithm(); } } public byte[] getCertHash() { if (certID != null) { return certID.getCertHash(); } else { return certIDv2.getCertHash(); } } public IssuerSerial getIssuerSerial() { if (certID != null) { return certID.getIssuerSerial(); } else { return certIDv2.getIssuerSerial(); } } } }




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