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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 to JDK 1.8. 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.cmp;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.cmp.PKIBody;
import org.bouncycastle.asn1.cmp.PKIHeader;
import org.bouncycastle.asn1.cmp.PKIMessage;
import org.bouncycastle.cert.CertIOException;

/**
 * General wrapper for a generic PKIMessage
 */
public class GeneralPKIMessage
{
    private final PKIMessage pkiMessage;

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

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

    /**
     * Wrap a PKIMessage ASN.1 structure.
     *
     * @param pkiMessage base PKI message.
     */
    public GeneralPKIMessage(PKIMessage pkiMessage)
    {
        this.pkiMessage = pkiMessage;
    }

    public PKIHeader getHeader()
    {
        return pkiMessage.getHeader();
    }

    public PKIBody getBody()
    {
        return pkiMessage.getBody();
    }

    /**
     * Return true if this message has protection bits on it. A return value of true
     * indicates the message can be used to construct a ProtectedPKIMessage.
     *
     * @return true if message has protection, false otherwise.
     */
    public boolean hasProtection()
    {
        return pkiMessage.getHeader().getProtectionAlg() != null;
    }

    public PKIMessage toASN1Structure()
    {
        return pkiMessage;
    }
}