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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 and up. 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.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.cms.OriginatorInfo;
import org.bouncycastle.asn1.x509.Certificate;
import org.bouncycastle.asn1.x509.CertificateList;
import org.bouncycastle.cert.X509CRLHolder;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.util.CollectionStore;
import org.bouncycastle.util.Store;

public class OriginatorInformation
{
    private OriginatorInfo originatorInfo;

    OriginatorInformation(OriginatorInfo originatorInfo)
    {
        this.originatorInfo = originatorInfo;
    }

    /**
     * Return the certificates stored in the underlying OriginatorInfo object.
     *
     * @return a Store of X509CertificateHolder objects.
     */
    public Store getCertificates()
    {
        ASN1Set certSet = originatorInfo.getCertificates();

        if (certSet != null)
        {
            List certList = new ArrayList(certSet.size());

            for (Enumeration en = certSet.getObjects(); en.hasMoreElements();)
            {
                ASN1Primitive obj = ((ASN1Encodable)en.nextElement()).toASN1Primitive();

                if (obj instanceof ASN1Sequence)
                {
                    certList.add(new X509CertificateHolder(Certificate.getInstance(obj)));
                }
            }

            return new CollectionStore(certList);
        }

        return new CollectionStore(new ArrayList());
    }

    /**
     * Return the CRLs stored in the underlying OriginatorInfo object.
     *
     * @return a Store of X509CRLHolder objects.
     */
    public Store getCRLs()
    {
        ASN1Set crlSet = originatorInfo.getCRLs();

        if (crlSet != null)
        {
            List    crlList = new ArrayList(crlSet.size());

            for (Enumeration en = crlSet.getObjects(); en.hasMoreElements();)
            {
                ASN1Primitive obj = ((ASN1Encodable)en.nextElement()).toASN1Primitive();

                if (obj instanceof ASN1Sequence)
                {
                    crlList.add(new X509CRLHolder(CertificateList.getInstance(obj)));
                }
            }

            return new CollectionStore(crlList);
        }

        return new CollectionStore(new ArrayList());
    }

    /**
     * Return the underlying ASN.1 object defining this SignerInformation object.
     *
     * @return a OriginatorInfo.
     */
    public OriginatorInfo toASN1Structure()
    {
        return originatorInfo;
    }
}