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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.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 java.util.HashSet;
import java.util.Set;

import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.cms.IssuerAndSerialNumber;
import org.spongycastle.asn1.oiw.OIWObjectIdentifiers;
import org.spongycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.spongycastle.asn1.sec.SECObjectIdentifiers;
import org.spongycastle.asn1.x509.Certificate;
import org.spongycastle.asn1.x509.Extension;
import org.spongycastle.asn1.x9.X9ObjectIdentifiers;
import org.spongycastle.cms.CMSException;
import org.spongycastle.jcajce.util.AlgorithmParametersUtils;
import org.spongycastle.util.Strings;

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

    static
    {
        des.add("DES");
        des.add("DESEDE");
        des.add(OIWObjectIdentifiers.desCBC.getId());
        des.add(PKCSObjectIdentifiers.des_EDE3_CBC.getId());
        des.add(PKCSObjectIdentifiers.des_EDE3_CBC.getId());
        des.add(PKCSObjectIdentifiers.id_alg_CMS3DESwrap.getId());

        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);
    }

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

    static boolean isDES(String algorithmID)
    {
        String name = Strings.toUpperCase(algorithmID);

        return des.contains(name);
    }

    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);
        }
    }
}