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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.
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package org.bouncycastle.jcajce.provider.asymmetric.rsa;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.security.interfaces.RSAPrivateCrtKey;
import java.security.spec.RSAPrivateCrtKeySpec;

import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.pkcs.RSAPrivateKey;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters;
import org.bouncycastle.jcajce.provider.asymmetric.util.KeyUtil;
import org.bouncycastle.jcajce.provider.asymmetric.util.PKCS12BagAttributeCarrierImpl;
import org.bouncycastle.util.Strings;

/**
 * A provider representation for a RSA private key, with CRT factors included.
 */
public class BCRSAPrivateCrtKey
    extends BCRSAPrivateKey
    implements RSAPrivateCrtKey
{
    static final long serialVersionUID = 7834723820638524718L;
    
    private BigInteger  publicExponent;
    private BigInteger  primeP;
    private BigInteger  primeQ;
    private BigInteger  primeExponentP;
    private BigInteger  primeExponentQ;
    private BigInteger  crtCoefficient;

    /**
     * construct a private key from it's org.bouncycastle.crypto equivalent.
     *
     * @param key the parameters object representing the private key.
     */
    BCRSAPrivateCrtKey(
        RSAPrivateCrtKeyParameters key)
    {
        super(key);

        this.publicExponent = key.getPublicExponent();
        this.primeP = key.getP();
        this.primeQ = key.getQ();
        this.primeExponentP = key.getDP();
        this.primeExponentQ = key.getDQ();
        this.crtCoefficient = key.getQInv();
    }

    /**
     * construct a private key from an RSAPrivateCrtKeySpec
     *
     * @param spec the spec to be used in construction.
     */
    BCRSAPrivateCrtKey(
        RSAPrivateCrtKeySpec spec)
    {
        super(new RSAPrivateCrtKeyParameters(spec.getModulus(),
                                spec.getPublicExponent(), spec.getPrivateExponent(),
                                spec.getPrimeP(), spec.getPrimeQ(), spec.getPrimeExponentP(), spec.getPrimeExponentQ(), spec.getCrtCoefficient()));

        this.modulus = spec.getModulus();
        this.publicExponent = spec.getPublicExponent();
        this.privateExponent = spec.getPrivateExponent();
        this.primeP = spec.getPrimeP();
        this.primeQ = spec.getPrimeQ();
        this.primeExponentP = spec.getPrimeExponentP();
        this.primeExponentQ = spec.getPrimeExponentQ();
        this.crtCoefficient = spec.getCrtCoefficient();
    }

    /**
     * construct a private key from another RSAPrivateCrtKey.
     *
     * @param key the object implementing the RSAPrivateCrtKey interface.
     */
    BCRSAPrivateCrtKey(
        RSAPrivateCrtKey key)
    {
        super(new RSAPrivateCrtKeyParameters(key.getModulus(),
                                key.getPublicExponent(), key.getPrivateExponent(),
                                key.getPrimeP(), key.getPrimeQ(), key.getPrimeExponentP(), key.getPrimeExponentQ(), key.getCrtCoefficient()));

        this.modulus = key.getModulus();
        this.publicExponent = key.getPublicExponent();
        this.privateExponent = key.getPrivateExponent();
        this.primeP = key.getPrimeP();
        this.primeQ = key.getPrimeQ();
        this.primeExponentP = key.getPrimeExponentP();
        this.primeExponentQ = key.getPrimeExponentQ();
        this.crtCoefficient = key.getCrtCoefficient();
    }

    /**
     * construct an RSA key from a private key info object.
     */
    BCRSAPrivateCrtKey(
        PrivateKeyInfo info)
        throws IOException
    {
        this(RSAPrivateKey.getInstance(info.parsePrivateKey()));
    }

    /**
     * construct an RSA key from a ASN.1 RSA private key object.
     */
    BCRSAPrivateCrtKey(
        RSAPrivateKey key)
    {
        super(new RSAPrivateCrtKeyParameters(key.getModulus(),
                                key.getPublicExponent(), key.getPrivateExponent(),
                                key.getPrime1(), key.getPrime2(), key.getExponent1(), key.getExponent2(), key.getCoefficient()));

        this.modulus = key.getModulus();
        this.publicExponent = key.getPublicExponent();
        this.privateExponent = key.getPrivateExponent();
        this.primeP = key.getPrime1();
        this.primeQ = key.getPrime2();
        this.primeExponentP = key.getExponent1();
        this.primeExponentQ = key.getExponent2();
        this.crtCoefficient = key.getCoefficient();
    }

    /**
     * return the encoding format we produce in getEncoded().
     *
     * @return the encoding format we produce in getEncoded().
     */
    public String getFormat()
    {
        return "PKCS#8";
    }

    /**
     * Return a PKCS8 representation of the key. The sequence returned
     * represents a full PrivateKeyInfo object.
     *
     * @return a PKCS8 representation of the key.
     */
    public byte[] getEncoded()
    {
        return KeyUtil.getEncodedPrivateKeyInfo(new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, DERNull.INSTANCE), new RSAPrivateKey(getModulus(), getPublicExponent(), getPrivateExponent(), getPrimeP(), getPrimeQ(), getPrimeExponentP(), getPrimeExponentQ(), getCrtCoefficient()));
    }

    /**
     * return the public exponent.
     *
     * @return the public exponent.
     */
    public BigInteger getPublicExponent()
    {
        return publicExponent;
    }

    /**
     * return the prime P.
     *
     * @return the prime P.
     */
    public BigInteger getPrimeP()
    {
        return primeP;
    }

    /**
     * return the prime Q.
     *
     * @return the prime Q.
     */
    public BigInteger getPrimeQ()
    {
        return primeQ;
    }

    /**
     * return the prime exponent for P.
     *
     * @return the prime exponent for P.
     */
    public BigInteger getPrimeExponentP()
    {
        return primeExponentP;
    }

    /**
     * return the prime exponent for Q.
     *
     * @return the prime exponent for Q.
     */
    public BigInteger getPrimeExponentQ()
    {
        return primeExponentQ;
    }

    /**
     * return the CRT coefficient.
     *
     * @return the CRT coefficient.
     */
    public BigInteger getCrtCoefficient()
    {
        return crtCoefficient;
    }

    public int hashCode()
    {
        return this.getModulus().hashCode()
               ^ this.getPublicExponent().hashCode()
               ^ this.getPrivateExponent().hashCode();
    }

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

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

        RSAPrivateCrtKey key = (RSAPrivateCrtKey)o;

        return this.getModulus().equals(key.getModulus())
         && this.getPublicExponent().equals(key.getPublicExponent())
         && this.getPrivateExponent().equals(key.getPrivateExponent())
         && this.getPrimeP().equals(key.getPrimeP())
         && this.getPrimeQ().equals(key.getPrimeQ())
         && this.getPrimeExponentP().equals(key.getPrimeExponentP())
         && this.getPrimeExponentQ().equals(key.getPrimeExponentQ())
         && this.getCrtCoefficient().equals(key.getCrtCoefficient());
    }

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

        this.attrCarrier = new PKCS12BagAttributeCarrierImpl();
        this.rsaPrivateKey = new RSAPrivateCrtKeyParameters(this.getModulus(),
                                        this.getPublicExponent(), this.getPrivateExponent(),
                                        this.getPrimeP(), this.getPrimeQ(),
                                        this.getPrimeExponentP(), this.getPrimeExponentQ(), this.getCrtCoefficient());
    }

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

    public String toString()
    {
        StringBuffer    buf = new StringBuffer();
        String          nl = Strings.lineSeparator();

        buf.append("RSA Private CRT Key [").append(
                    RSAUtil.generateKeyFingerprint(this.getModulus())).append("]")
            .append(",[")
            .append(RSAUtil.generateExponentFingerprint(this.getPublicExponent()))
            .append("]")
            .append(nl);
        buf.append("             modulus: ").append(this.getModulus().toString(16)).append(nl);
        buf.append("     public exponent: ").append(this.getPublicExponent().toString(16)).append(nl);
        
        return buf.toString();
    }
}