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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;

import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.DEROctetString;
import org.spongycastle.asn1.cms.KEKIdentifier;
import org.spongycastle.asn1.cms.KEKRecipientInfo;
import org.spongycastle.asn1.cms.RecipientInfo;
import org.spongycastle.operator.GenericKey;
import org.spongycastle.operator.OperatorException;
import org.spongycastle.operator.SymmetricKeyWrapper;

public abstract class KEKRecipientInfoGenerator
    implements RecipientInfoGenerator
{
    private final KEKIdentifier kekIdentifier;

    protected final SymmetricKeyWrapper wrapper;

    protected KEKRecipientInfoGenerator(KEKIdentifier kekIdentifier, SymmetricKeyWrapper wrapper)
    {
        this.kekIdentifier = kekIdentifier;
        this.wrapper = wrapper;
    }

    public final RecipientInfo generate(GenericKey contentEncryptionKey)
        throws CMSException
    {
        try
        {
            ASN1OctetString encryptedKey = new DEROctetString(wrapper.generateWrappedKey(contentEncryptionKey));

            return new RecipientInfo(new KEKRecipientInfo(kekIdentifier, wrapper.getAlgorithmIdentifier(), encryptedKey));
        }
        catch (OperatorException e)
        {
            throw new CMSException("exception wrapping content key: " + e.getMessage(), e);
        }
    }
}