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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 KeyTransRecipientId
    extends RecipientId
{
    private X509CertificateHolderSelector baseSelector;

    private KeyTransRecipientId(X509CertificateHolderSelector baseSelector)
    {
        super(keyTrans);

        this.baseSelector = baseSelector;
    }

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

    /**
     * Construct a key trans 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 KeyTransRecipientId(X500Name issuer, BigInteger serialNumber)
    {
        this(issuer, serialNumber, null);
    }

    /**
     * Construct a key trans 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.
     * @param subjectKeyId the subject key identifier to use to match the recipients associated certificate.
     */
    public KeyTransRecipientId(X500Name issuer, BigInteger serialNumber, byte[] subjectKeyId)
    {
        this(new X509CertificateHolderSelector(issuer, serialNumber, subjectKeyId));
    }

    public X500Name getIssuer()
    {
        return baseSelector.getIssuer();
    }

    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 KeyTransRecipientId))
        {
            return false;
        }

        KeyTransRecipientId id = (KeyTransRecipientId)o;

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

    public Object clone()
    {
        return new KeyTransRecipientId(this.baseSelector);
    }

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

        return baseSelector.match(obj);
    }
}