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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.cms.jcajce;

import java.io.IOException;
import java.security.AlgorithmParameters;
import java.security.Provider;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.cms.IssuerAndSerialNumber;
import org.bouncycastle.asn1.x509.Certificate;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.TBSCertificateStructure;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.jcajce.util.JcaJceUtils;

class CMSUtils
{
    static TBSCertificateStructure getTBSCertificateStructure(
        X509Certificate cert)
        throws CertificateEncodingException
    {
            return TBSCertificateStructure.getInstance(cert.getTBSCertificate());
    }

    static IssuerAndSerialNumber getIssuerAndSerialNumber(X509Certificate cert)
        throws CertificateEncodingException
    {
        Certificate certStruct = Certificate.getInstance(cert.getEncoded());

        return new IssuerAndSerialNumber(certStruct.getIssuer(), cert.getSerialNumber());
    }


    static byte[] getSubjectKeyId(X509Certificate cert)
    {
        byte[] ext = cert.getExtensionValue(Extension.subjectKeyIdentifier.getId());

        if (ext != null)
        {
            return ASN1OctetString.getInstance(ASN1OctetString.getInstance(ext).getOctets()).getOctets();
        }
        else
        {
            return null;
        }
    }

    static EnvelopedDataHelper createContentHelper(Provider provider)
    {
        if (provider != null)
        {
            return new EnvelopedDataHelper(new ProviderJcaJceExtHelper(provider));
        }
        else
        {
            return new EnvelopedDataHelper(new DefaultJcaJceExtHelper());
        }
    }

    static EnvelopedDataHelper createContentHelper(String providerName)
    {
        if (providerName != null)
        {
            return new EnvelopedDataHelper(new NamedJcaJceExtHelper(providerName));
        }
        else
        {
            return new EnvelopedDataHelper(new DefaultJcaJceExtHelper());
        }
    }

    static ASN1Encodable extractParameters(AlgorithmParameters params)
        throws CMSException
    {
        try
        {
            return JcaJceUtils.extractParameters(params);
        }
        catch (IOException e)
        {
            throw new CMSException("cannot extract parameters: " + e.getMessage(), e);
        }
    }

    static void loadParameters(AlgorithmParameters params, ASN1Encodable sParams)
        throws CMSException
    {
        try
        {
            JcaJceUtils.loadParameters(params, sParams);
        }
        catch (IOException e)
        {
            throw new CMSException("error encoding algorithm parameters.", e);
        }
    }
}