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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;

import java.math.BigInteger;

import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.cert.selector.X509CertificateHolderSelector;

public class KeyAgreeRecipientId
    extends RecipientId
{
    private X509CertificateHolderSelector baseSelector;

    private KeyAgreeRecipientId(X509CertificateHolderSelector baseSelector)
    {
        super(keyAgree);

        this.baseSelector = baseSelector;
    }

    /**
     * Construct a key agree recipient ID with the value of a public key's subjectKeyId.
     *
     * @param subjectKeyId a subjectKeyId
     */
    public KeyAgreeRecipientId(byte[] subjectKeyId)
    {
        this(null, null, subjectKeyId);
    }

    /**
     * Construct a key agree recipient ID based on the issuer and serial number of the recipient's associated
     * certificate.
     *
     * @param issuer the issuer of the recipient's associated certificate.
     * @param serialNumber the serial number of the recipient's associated certificate.
     */
    public KeyAgreeRecipientId(X500Name issuer, BigInteger serialNumber)
    {
        this(issuer, serialNumber, null);
    }

    public KeyAgreeRecipientId(X500Name issuer, BigInteger serialNumber, byte[] subjectKeyId)
    {
        this(new X509CertificateHolderSelector(issuer, serialNumber, subjectKeyId));
    }

    public BigInteger getSerialNumber()
    {
        return baseSelector.getSerialNumber();
    }

    public byte[] getSubjectKeyIdentifier()
    {
        return baseSelector.getSubjectKeyIdentifier();
    }

    public int hashCode()
    {
        return baseSelector.hashCode();
    }

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

        KeyAgreeRecipientId id = (KeyAgreeRecipientId)o;

        return this.baseSelector.equals(id.baseSelector);
    }

    public Object clone()
    {
        return new KeyAgreeRecipientId(baseSelector);
    }

    public boolean match(Object obj)
    {
        if (obj instanceof KeyAgreeRecipientInformation)
        {
            return ((KeyAgreeRecipientInformation)obj).getRID().equals(this);
        }

        return baseSelector.match(obj);
    }
}