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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.4. 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.cert;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.math.BigInteger;
import java.util.Date;
import java.util.List;
import java.util.Set;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.Certificate;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x509.TBSCertificate;
import org.bouncycastle.operator.ContentVerifier;
import org.bouncycastle.operator.ContentVerifierProvider;
import org.bouncycastle.util.Encodable;

/**
 * Holding class for an X.509 Certificate structure.
 */
public class X509CertificateHolder
    implements Encodable, Serializable
{
    private static final long serialVersionUID = 20170722001L;

    private transient Certificate x509Certificate;
    private transient Extensions  extensions;

    private static Certificate parseBytes(byte[] certEncoding)
        throws IOException
    {
        try
        {
            return Certificate.getInstance(CertUtils.parseNonEmptyASN1(certEncoding));
        }
        catch (ClassCastException e)
        {
            throw new CertIOException("malformed data: " + e.getMessage(), e);
        }
        catch (IllegalArgumentException e)
        {
            throw new CertIOException("malformed data: " + e.getMessage(), e);
        }
    }

    /**
     * Create a X509CertificateHolder from the passed in bytes.
     *
     * @param certEncoding BER/DER encoding of the certificate.
     * @throws IOException in the event of corrupted data, or an incorrect structure.
     */
    public X509CertificateHolder(byte[] certEncoding)
        throws IOException
    {
        this(parseBytes(certEncoding));
    }

    /**
     * Create a X509CertificateHolder from the passed in ASN.1 structure.
     *
     * @param x509Certificate an ASN.1 Certificate structure.
     */
    public X509CertificateHolder(Certificate x509Certificate)
    {
        init(x509Certificate);
    }

    private void init(Certificate x509Certificate)
    {
        this.x509Certificate = x509Certificate;
        this.extensions = x509Certificate.getTBSCertificate().getExtensions();
    }

    public int getVersionNumber()
    {
        return x509Certificate.getVersionNumber();
    }

    /**
     * @deprecated use getVersionNumber
     */
    public int getVersion()
    {
        return x509Certificate.getVersionNumber();
    }

    /**
     * Return whether or not the holder's certificate contains extensions.
     *
     * @return true if extension are present, false otherwise.
     */
    public boolean hasExtensions()
    {
        return extensions != null;
    }

    /**
     * Look up the extension associated with the passed in OID.
     *
     * @param oid the OID of the extension of interest.
     *
     * @return the extension if present, null otherwise.
     */
    public Extension getExtension(ASN1ObjectIdentifier oid)
    {
        if (extensions != null)
        {
            return extensions.getExtension(oid);
        }

        return null;
    }

    /**
     * Return the extensions block associated with this certificate if there is one.
     *
     * @return the extensions block, null otherwise.
     */
    public Extensions getExtensions()
    {
        return extensions;
    }

    /**
     * Returns a list of ASN1ObjectIdentifier objects representing the OIDs of the
     * extensions contained in this holder's certificate.
     *
     * @return a list of extension OIDs.
     */
    public List getExtensionOIDs()
    {
        return CertUtils.getExtensionOIDs(extensions);
    }

    /**
     * Returns a set of ASN1ObjectIdentifier objects representing the OIDs of the
     * critical extensions contained in this holder's certificate.
     *
     * @return a set of critical extension OIDs.
     */
    public Set getCriticalExtensionOIDs()
    {
        return CertUtils.getCriticalExtensionOIDs(extensions);
    }

    /**
     * Returns a set of ASN1ObjectIdentifier objects representing the OIDs of the
     * non-critical extensions contained in this holder's certificate.
     *
     * @return a set of non-critical extension OIDs.
     */
    public Set getNonCriticalExtensionOIDs()
    {
        return CertUtils.getNonCriticalExtensionOIDs(extensions);
    }

    /**
     * Return the serial number of this attribute certificate.
     *
     * @return the serial number.
     */
    public BigInteger getSerialNumber()
    {
        return x509Certificate.getSerialNumber().getValue();
    }

    /**
     * Return the issuer of this certificate.
     *
     * @return the certificate issuer.
     */
    public X500Name getIssuer()
    {
        return X500Name.getInstance(x509Certificate.getIssuer());
    }

    /**
     * Return the subject this certificate is for.
     *
     * @return the subject for the certificate.
     */
    public X500Name getSubject()
    {
        return X500Name.getInstance(x509Certificate.getSubject());
    }

    /**
     * Return the date before which this certificate is not valid.
     *
     * @return the start time for the certificate's validity period.
     */
    public Date getNotBefore()
    {
        return x509Certificate.getStartDate().getDate();
    }

    /**
     * Return the date after which this certificate is not valid.
     *
     * @return the final time for the certificate's validity period.
     */
    public Date getNotAfter()
    {
        return x509Certificate.getEndDate().getDate();
    }

    /**
     * Return the SubjectPublicKeyInfo describing the public key this certificate is carrying.
     *
     * @return the public key ASN.1 structure contained in the certificate.
     */
    public SubjectPublicKeyInfo getSubjectPublicKeyInfo()
    {
        return x509Certificate.getSubjectPublicKeyInfo();
    }

    /**
     * Return the underlying ASN.1 structure for the certificate in this holder.
     *
     * @return a Certificate object.
     */
    public Certificate toASN1Structure()
    {
        return x509Certificate;
    }

    /**
     * Return the details of the signature algorithm used to create this attribute certificate.
     *
     * @return the AlgorithmIdentifier describing the signature algorithm used to create this attribute certificate.
     */
    public AlgorithmIdentifier getSignatureAlgorithm()
    {
        return x509Certificate.getSignatureAlgorithm();
    }

    /**
     * Return the bytes making up the signature associated with this attribute certificate.
     *
     * @return the attribute certificate signature bytes.
     */
    public byte[] getSignature()
    {
        return x509Certificate.getSignature().getOctets();
    }

    /**
     * Return whether or not this certificate is valid on a particular date.
     *
     * @param date the date of interest.
     * @return true if the certificate is valid, false otherwise.
     */
    public boolean isValidOn(Date date)
    {
        return !date.before(x509Certificate.getStartDate().getDate()) && !date.after(x509Certificate.getEndDate().getDate());
    }

    /**
     * Validate the signature on the certificate in this holder.
     *
     * @param verifierProvider a ContentVerifierProvider that can generate a verifier for the signature.
     * @return true if the signature is valid, false otherwise.
     * @throws CertException if the signature cannot be processed or is inappropriate.
     */
    public boolean isSignatureValid(ContentVerifierProvider verifierProvider)
        throws CertException
    {
        TBSCertificate tbsCert = x509Certificate.getTBSCertificate();

        if (!CertUtils.isAlgIdEqual(tbsCert.getSignature(), x509Certificate.getSignatureAlgorithm()))
        {
            throw new CertException("signature invalid - algorithm identifier mismatch");
        }

        ContentVerifier verifier;

        try
        {
            verifier = verifierProvider.get((tbsCert.getSignature()));

            OutputStream sOut = verifier.getOutputStream();
            tbsCert.encodeTo(sOut, ASN1Encoding.DER);
            sOut.close();
        }
        catch (Exception e)
        {
            throw new CertException("unable to process signature: " + e.getMessage(), e);
        }

        return verifier.verify(this.getSignature());
    }

    public boolean equals(
        Object o)
    {
        if (o == this)
        {
            return true;
        }

        if (!(o instanceof X509CertificateHolder))
        {
            return false;
        }

        X509CertificateHolder other = (X509CertificateHolder)o;

        return this.x509Certificate.equals(other.x509Certificate);
    }

    public int hashCode()
    {
        return this.x509Certificate.hashCode();
    }

    /**
     * Return the ASN.1 encoding of this holder's certificate.
     *
     * @return a DER encoded byte array.
     * @throws IOException if an encoding cannot be generated.
     */
    public byte[] getEncoded()
        throws IOException
    {
        return x509Certificate.getEncoded();
    }

    private void readObject(
        ObjectInputStream in)
        throws IOException, ClassNotFoundException
    {
        in.defaultReadObject();

        init(Certificate.getInstance(in.readObject()));
    }

    private void writeObject(
        ObjectOutputStream out)
        throws IOException
    {
        out.defaultWriteObject();

        out.writeObject(this.getEncoded());
    }
}