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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.PrivateKey;
import java.security.Provider;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;
import java.util.HashSet;
import java.util.Set;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.cms.IssuerAndSerialNumber;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.rosstandart.RosstandartObjectIdentifiers;
import org.bouncycastle.asn1.sec.SECObjectIdentifiers;
import org.bouncycastle.asn1.x509.Certificate;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.jcajce.util.AlgorithmParametersUtils;
import org.bouncycastle.jcajce.util.AnnotatedPrivateKey;

class CMSUtils
{
    private static final Set mqvAlgs = new HashSet();
    private static final Set ecAlgs = new HashSet();
    private static final Set gostAlgs = new HashSet();

    static
    {
        mqvAlgs.add(X9ObjectIdentifiers.mqvSinglePass_sha1kdf_scheme);
        mqvAlgs.add(SECObjectIdentifiers.mqvSinglePass_sha224kdf_scheme);
        mqvAlgs.add(SECObjectIdentifiers.mqvSinglePass_sha256kdf_scheme);
        mqvAlgs.add(SECObjectIdentifiers.mqvSinglePass_sha384kdf_scheme);
        mqvAlgs.add(SECObjectIdentifiers.mqvSinglePass_sha512kdf_scheme);

        ecAlgs.add(X9ObjectIdentifiers.dhSinglePass_cofactorDH_sha1kdf_scheme);
        ecAlgs.add(X9ObjectIdentifiers.dhSinglePass_stdDH_sha1kdf_scheme);
        ecAlgs.add(SECObjectIdentifiers.dhSinglePass_cofactorDH_sha224kdf_scheme);
        ecAlgs.add(SECObjectIdentifiers.dhSinglePass_stdDH_sha224kdf_scheme);
        ecAlgs.add(SECObjectIdentifiers.dhSinglePass_cofactorDH_sha256kdf_scheme);
        ecAlgs.add(SECObjectIdentifiers.dhSinglePass_stdDH_sha256kdf_scheme);
        ecAlgs.add(SECObjectIdentifiers.dhSinglePass_cofactorDH_sha384kdf_scheme);
        ecAlgs.add(SECObjectIdentifiers.dhSinglePass_stdDH_sha384kdf_scheme);
        ecAlgs.add(SECObjectIdentifiers.dhSinglePass_cofactorDH_sha512kdf_scheme);
        ecAlgs.add(SECObjectIdentifiers.dhSinglePass_stdDH_sha512kdf_scheme);

        gostAlgs.add(CryptoProObjectIdentifiers.gostR3410_2001_CryptoPro_ESDH);
        gostAlgs.add(CryptoProObjectIdentifiers.gostR3410_2001);
        gostAlgs.add(RosstandartObjectIdentifiers.id_tc26_agreement_gost_3410_12_256);
        gostAlgs.add(RosstandartObjectIdentifiers.id_tc26_agreement_gost_3410_12_512);
        gostAlgs.add(RosstandartObjectIdentifiers.id_tc26_gost_3410_12_256);
        gostAlgs.add(RosstandartObjectIdentifiers.id_tc26_gost_3410_12_512);
    }

    static boolean isMQV(ASN1ObjectIdentifier algorithm)
    {
        return mqvAlgs.contains(algorithm);
    }

    static boolean isEC(ASN1ObjectIdentifier algorithm)
    {
        return ecAlgs.contains(algorithm);
    }

    static boolean isGOST(ASN1ObjectIdentifier algorithm)
    {
        return gostAlgs.contains(algorithm);
    }

    static boolean isRFC2631(ASN1ObjectIdentifier algorithm)
    {
        return algorithm.equals(PKCSObjectIdentifiers.id_alg_ESDH) || algorithm.equals(PKCSObjectIdentifiers.id_alg_SSDH);
    }

    static PrivateKey cleanPrivateKey(PrivateKey key)
    {
        if (key instanceof AnnotatedPrivateKey)
        {
            return cleanPrivateKey(((AnnotatedPrivateKey)key).getKey());
        }
        else
        {
            return key;
        }
    }

    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 AlgorithmParametersUtils.extractParameters(params);
        }
        catch (IOException e)
        {
            throw new CMSException("cannot extract parameters: " + e.getMessage(), e);
        }
    }

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