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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.cms;

import org.bouncycastle.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;
    }
}