x509certificateobject.java

这是一个基于java编写的torrent的P2P源码

package org.bouncycastle.jce.provider;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Principal;
import java.security.Provider;
import java.security.PublicKey;
import java.security.Security;
import java.security.Signature;
import java.security.SignatureException;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateExpiredException;
import java.security.cert.CertificateNotYetValidException;
import java.security.cert.X509Certificate;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Set;
import java.util.Vector;

import javax.security.auth.x500.X500Principal;

import org.bouncycastle.asn1.*;
import org.bouncycastle.asn1.misc.MiscObjectIdentifiers;
import org.bouncycastle.asn1.misc.NetscapeCertType;
import org.bouncycastle.asn1.misc.NetscapeRevocationURL;
import org.bouncycastle.asn1.misc.VerisignCzagExtension;
import org.bouncycastle.asn1.util.ASN1Dump;
import org.bouncycastle.asn1.x509.BasicConstraints;
import org.bouncycastle.asn1.x509.KeyUsage;
import org.bouncycastle.asn1.x509.X509CertificateStructure;
import org.bouncycastle.asn1.x509.X509Extension;
import org.bouncycastle.asn1.x509.X509Extensions;
import org.bouncycastle.jce.X509Principal;
import org.bouncycastle.jce.interfaces.PKCS12BagAttributeCarrier;
import org.bouncycastle.util.encoders.Hex;

public class X509CertificateObject
    extends X509Certificate
    implements PKCS12BagAttributeCarrier
{
    private X509CertificateStructure    c;
    private Hashtable                   pkcs12Attributes = new Hashtable();
    private Vector                      pkcs12Ordering = new Vector();

    public X509CertificateObject(
        X509CertificateStructure    c)
    {
        this.c = c;
    }

    public void checkValidity()
        throws CertificateExpiredException, CertificateNotYetValidException
    {
        this.checkValidity(new Date());
    }

    public void checkValidity(
        Date    date)
        throws CertificateExpiredException, CertificateNotYetValidException
    {
        if (date.after(this.getNotAfter()))
        {
            throw new CertificateExpiredException("certificate expired on " + c.getEndDate().getTime());
        }

        if (date.before(this.getNotBefore()))
        {
            throw new CertificateNotYetValidException("certificate not valid till " + c.getStartDate().getTime());
        }
    }

    public int getVersion()
    {
        return c.getVersion();
    }

    public BigInteger getSerialNumber()
    {
        return c.getSerialNumber().getValue();
    }

    public Principal getIssuerDN()
    {
        return new X509Principal(c.getIssuer());
    }

    public X500Principal getIssuerX500Principal()
    {
        try
        {
            ByteArrayOutputStream   bOut = new ByteArrayOutputStream();
            ASN1OutputStream        aOut = new ASN1OutputStream(bOut);

            aOut.writeObject(c.getIssuer());

            return new X500Principal(bOut.toByteArray());
        }
        catch (IOException e)
        {
            throw new IllegalStateException("can't encode issuer DN");
        }
    }

    public Principal getSubjectDN()
    {
        return new X509Principal(c.getSubject());
    }

    public X500Principal getSubjectX500Principal()
    {
        try
        {
            ByteArrayOutputStream   bOut = new ByteArrayOutputStream();
            ASN1OutputStream        aOut = new ASN1OutputStream(bOut);

            aOut.writeObject(c.getSubject());

            return new X500Principal(bOut.toByteArray());
        }
        catch (IOException e)
        {
            throw new IllegalStateException("can't encode issuer DN");
        }
    }

    public Date getNotBefore()
    {
        return c.getStartDate().getDate();
    }

    public Date getNotAfter()
    {
        return c.getEndDate().getDate();
    }

    public byte[] getTBSCertificate()
        throws CertificateEncodingException
    {
        ByteArrayOutputStream   bOut = new ByteArrayOutputStream();
        DEROutputStream         dOut = new DEROutputStream(bOut);

        try
        {
            dOut.writeObject(c.getTBSCertificate());

            return bOut.toByteArray();
        }
        catch (IOException e)
        {
            throw new CertificateEncodingException(e.toString());
        }
    }

    public byte[] getSignature()
    {
        return c.getSignature().getBytes();
    }

    /**
     * return a more "meaningful" representation for the signature algorithm used in
     * the certficate.
     */
    public String getSigAlgName()
    {
        Provider    prov = Security.getProvider("BC");
        String      algName = prov.getProperty("Alg.Alias.Signature." + this.getSigAlgOID());

        if (algName != null)
        {
            return algName;
        }

        Provider[] provs = Security.getProviders();

        //
        // search every provider looking for a real algorithm
        //
        for (int i = 0; i != provs.length; i++)
        {
            algName = provs[i].getProperty("Alg.Alias.Signature." + this.getSigAlgOID());
            if (algName != null)
            {
                return algName;
            }
        }

        return this.getSigAlgOID();
    }

    /**
     * return the object identifier for the signature.
     */
    public String getSigAlgOID()
    {
        return c.getSignatureAlgorithm().getObjectId().getId();
    }

    /**
     * return the signature parameters, or null if there aren't any.
     */
    public byte[] getSigAlgParams()
    {
        ByteArrayOutputStream   bOut = new ByteArrayOutputStream();

        if (c.getSignatureAlgorithm().getParameters() != null)
        {
            try
            {
                DEROutputStream         dOut = new DEROutputStream(bOut);

                dOut.writeObject(c.getSignatureAlgorithm().getParameters());
            }
            catch (Exception e)
            {
                throw new RuntimeException("exception getting sig parameters " + e);
            }

            return bOut.toByteArray();
        }
        else
        {
            return null;
        }
    }

    public boolean[] getIssuerUniqueID()
    {
        DERBitString    id = c.getTBSCertificate().getIssuerUniqueId();

        if (id != null)
        {
            byte[]          bytes = id.getBytes();
            boolean[]       boolId = new boolean[bytes.length * 8 - id.getPadBits()];

            for (int i = 0; i != boolId.length; i++)
            {
                boolId[i] = (bytes[i / 8] & (0x80 >>> (i % 8))) != 0;
            }

            return boolId;
        }
            
        return null;
    }

    public boolean[] getSubjectUniqueID()
    {
        DERBitString    id = c.getTBSCertificate().getSubjectUniqueId();

        if (id != null)
        {
            byte[]          bytes = id.getBytes();
            boolean[]       boolId = new boolean[bytes.length * 8 - id.getPadBits()];

            for (int i = 0; i != boolId.length; i++)
            {
                boolId[i] = (bytes[i / 8] & (0x80 >>> (i % 8))) != 0;
            }

            return boolId;
        }
            
        return null;
    }

    public boolean[] getKeyUsage()
    {
        byte[]  bytes = this.getExtensionBytes("2.5.29.15");
        int     length = 0;

        if (bytes != null)
        {
            try
            {
                DERInputStream  dIn = new DERInputStream(new ByteArrayInputStream(bytes));
                DERBitString    bits = (DERBitString)dIn.readObject();

                bytes = bits.getBytes();
                length = (bytes.length * 8) - bits.getPadBits();
            }
            catch (Exception e)
            {
                throw new RuntimeException("error processing key usage extension");
            }

            boolean[]       keyUsage = new boolean[(length < 9) ? 9 : length];

            for (int i = 0; i != length; i++)
            {
                keyUsage[i] = (bytes[i / 8] & (0x80 >>> (i % 8))) != 0;
            }

            return keyUsage;
        }

        return null;
    }

    public int getBasicConstraints()
    {
        byte[]  bytes = this.getExtensionBytes("2.5.29.19");

        if (bytes != null)
        {
            try
            {
                DERInputStream  dIn = new DERInputStream(new ByteArrayInputStream(bytes));
                ASN1Sequence    seq = (ASN1Sequence)dIn.readObject();

                if (seq.size() == 2)
                {
                    if (((DERBoolean)seq.getObjectAt(0)).isTrue())
                    {
                        return ((DERInteger)seq.getObjectAt(1)).getValue().intValue();
                    }
                    else
                    {
                        return -1;
                    }
                }
                else if (seq.size() == 1)
                {
                    if (seq.getObjectAt(0) instanceof DERBoolean)
                    {
                        if (((DERBoolean)seq.getObjectAt(0)).isTrue())
                        {
                            return Integer.MAX_VALUE;
                        }
                        else
                        {
                            return -1;
                        }