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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 1.5 and up. 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.pkcs;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.pkcs.ContentInfo;
import org.bouncycastle.asn1.pkcs.MacData;
import org.bouncycastle.asn1.pkcs.PKCS12PBEParams;
import org.bouncycastle.asn1.pkcs.Pfx;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.Arrays;

/**
 * A holding class for the PKCS12 Pfx structure.
 */
public class PKCS12PfxPdu
{
    private Pfx pfx;

    private static Pfx parseBytes(byte[] pfxEncoding)
        throws IOException
    {
        try
        {
            return Pfx.getInstance(ASN1Primitive.fromByteArray(pfxEncoding));
        }
        catch (ClassCastException e)
        {
            throw new PKCSIOException("malformed data: " + e.getMessage(), e);
        }
        catch (IllegalArgumentException e)
        {
            throw new PKCSIOException("malformed data: " + e.getMessage(), e);
        }
    }

    public PKCS12PfxPdu(Pfx pfx)
    {
        this.pfx = pfx;
    }

    public PKCS12PfxPdu(byte[] pfx)
        throws IOException
    {
        this(parseBytes(pfx));
    }

    /**
     * Return the content infos in the AuthenticatedSafe contained in this Pfx.
     *
     * @return an array of ContentInfo.
     */
    public ContentInfo[] getContentInfos()
    {
        ASN1Sequence seq = ASN1Sequence.getInstance(ASN1OctetString.getInstance(this.pfx.getAuthSafe().getContent()).getOctets());
        ContentInfo[] content = new ContentInfo[seq.size()];

        for (int i = 0; i != seq.size(); i++)
        {
            content[i] = ContentInfo.getInstance(seq.getObjectAt(i));
        }

        return content;
    }

    /**
     * Return whether or not there is MAC attached to this file.
     *
     * @return true if there is, false otherwise.
     */
    public boolean hasMac()
    {
        return pfx.getMacData() != null;
    }

    /**
     * Return the algorithm identifier describing the MAC algorithm
     *
     * @return the AlgorithmIdentifier representing the MAC algorithm, null if none present.
     */
    public AlgorithmIdentifier getMacAlgorithmID()
    {
        MacData md = pfx.getMacData();

        if (md != null)
        {
            return md.getMac().getAlgorithmId();
        }

        return null;
    }

    /**
     * Verify the MacData attached to the PFX is consistent with what is expected.
     *
     * @param macCalcProviderBuilder provider builder for the calculator for the MAC
     * @param password password to use
     * @return true if mac data is valid, false otherwise.
     * @throws PKCSException if there is a problem evaluating the MAC.
     * @throws IllegalStateException if no MAC is actually present
     */
    public boolean isMacValid(PKCS12MacCalculatorBuilderProvider macCalcProviderBuilder, char[] password)
        throws PKCSException
    {
        if (hasMac())
        {
            MacData pfxmData = pfx.getMacData();
            MacDataGenerator mdGen = new MacDataGenerator(macCalcProviderBuilder.get(new AlgorithmIdentifier(pfxmData.getMac().getAlgorithmId().getAlgorithm(), new PKCS12PBEParams(pfxmData.getSalt(), pfxmData.getIterationCount().intValue()))));

            try
            {
                MacData mData = mdGen.build(
                    password,
                    ASN1OctetString.getInstance(pfx.getAuthSafe().getContent()).getOctets());

                return Arrays.constantTimeAreEqual(mData.getEncoded(), pfx.getMacData().getEncoded());
            }
            catch (IOException e)
            {
                throw new PKCSException("unable to process AuthSafe: " + e.getMessage());
            }
        }

        throw new IllegalStateException("no MAC present on PFX");
    }

    /**
     * Return the underlying ASN.1 object.
     *
     * @return a Pfx object.
     */
    public Pfx toASN1Structure()
    {
        return pfx;
    }

    public byte[] getEncoded()
        throws IOException
    {
        return toASN1Structure().getEncoded();
    }

    /**
     * Return a Pfx with the outer wrapper encoded as asked for. For example, Pfx is a usually
     * a BER encoded object, to get one with DefiniteLength encoding use:
     *      * getEncoded(ASN1Encoding.DL)
     * 
     * @param encoding encoding style (ASN1Encoding.DER, ASN1Encoding.DL, ASN1Encoding.BER)
     * @return a byte array containing the encoded object.
     * @throws IOException
     */
    public byte[] getEncoded(String encoding)
        throws IOException
    {
        return toASN1Structure().getEncoded(encoding);
    }
}