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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.jcajce;

import java.math.BigInteger;
import java.security.cert.X509Certificate;

import javax.security.auth.x500.X500Principal;

import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.cms.KeyTransRecipientId;

public class JceKeyTransRecipientId
    extends KeyTransRecipientId
{
    /**
     * Construct a recipient id based on the issuer, serial number and subject key identifier (if present) of the passed in
     * certificate.
     *
     * @param certificate certificate providing the issue and serial number and subject key identifier.
     */
    public JceKeyTransRecipientId(X509Certificate certificate)
    {
        super(convertPrincipal(certificate.getIssuerX500Principal()), certificate.getSerialNumber(), CMSUtils.getSubjectKeyId(certificate));
    }

    /**
     * Construct a recipient id based on the provided issuer and serial number..
     *
     * @param issuer the issuer to use.
     * @param serialNumber  the serial number to use.
     */
    public JceKeyTransRecipientId(X500Principal issuer, BigInteger serialNumber)
    {
        super(convertPrincipal(issuer), serialNumber);
    }

    /**
     * Construct a recipient id based on the provided issuer, serial number, and subjectKeyId..
     *
     * @param issuer the issuer to use.
     * @param serialNumber  the serial number to use.
     * @param subjectKeyId the subject key ID to use.
     */
    public JceKeyTransRecipientId(X500Principal issuer, BigInteger serialNumber, byte[] subjectKeyId)
    {
        super(convertPrincipal(issuer), serialNumber, subjectKeyId);
    }

    private static X500Name convertPrincipal(X500Principal issuer)
    {
        if (issuer == null)
        {
            return null;
        }

        return X500Name.getInstance(issuer.getEncoded());
    }
}




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