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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.util.Arrays;

public class KEKRecipientId
    extends RecipientId
{
    private byte[] keyIdentifier;

    /**
     * Construct a recipient ID with the key identifier of a KEK recipient.
     *
     * @param keyIdentifier a subjectKeyId
     */
    public KEKRecipientId(byte[] keyIdentifier)
    {
        super(kek);

        this.keyIdentifier = keyIdentifier;
    }

    public int hashCode()
    {
        return Arrays.hashCode(keyIdentifier);
    }

    public boolean equals(
        Object o)
    {
        if (!(o instanceof KEKRecipientId))
        {
            return false;
        }

        KEKRecipientId id = (KEKRecipientId)o;

        return Arrays.areEqual(keyIdentifier, id.keyIdentifier);
    }

    public byte[] getKeyIdentifier()
    {
        return Arrays.clone(keyIdentifier);
    }

    public Object clone()
    {
        return new KEKRecipientId(keyIdentifier);
    }

    public boolean match(Object obj)
    {
        if (obj instanceof byte[])
        {
            return Arrays.areEqual(keyIdentifier, (byte[])obj);
        }
        else if (obj instanceof KEKRecipientInformation)
        {
            return ((KEKRecipientInformation)obj).getRID().equals(this);
        }

        return false;
    }
}