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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.its;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.oer.Element;
import org.bouncycastle.oer.OEREncoder;
import org.bouncycastle.oer.OERInputStream;
import org.bouncycastle.oer.its.etsi103097.EtsiTs103097DataEncrypted;
import org.bouncycastle.oer.its.ieee1609dot2.EncryptedData;
import org.bouncycastle.oer.its.ieee1609dot2.Ieee1609Dot2Content;
import org.bouncycastle.oer.its.ieee1609dot2.RecipientInfo;
import org.bouncycastle.oer.its.template.etsi103097.EtsiTs103097Module;
import org.bouncycastle.util.CollectionStore;
import org.bouncycastle.util.Store;

public class ETSIEncryptedData
{
    private static final Element oerDef = EtsiTs103097Module.EtsiTs103097Data_Encrypted.build();

    private final EncryptedData encryptedData;

    public ETSIEncryptedData(byte[] oerEncoded)
        throws IOException
    {
        this(new ByteArrayInputStream(oerEncoded));
    }

    public ETSIEncryptedData(InputStream str)
        throws IOException
    {
        OERInputStream oerIn;
        if (str instanceof OERInputStream)
        {
            oerIn = (OERInputStream)str;
        }
        else
        {
            oerIn = new OERInputStream(str);
        }
        ASN1Encodable asn1 = oerIn.parse(oerDef);

        Ieee1609Dot2Content content = EtsiTs103097DataEncrypted.getInstance(asn1).getContent();
        if (content.getChoice() != Ieee1609Dot2Content.encryptedData)
        {
            throw new IllegalStateException("EtsiTs103097Data-Encrypted did not have encrypted data content");
        }
        this.encryptedData = EncryptedData.getInstance(content.getIeee1609Dot2Content());
    }

    ETSIEncryptedData(EncryptedData data)
    {
        this.encryptedData = data;
    }

    public byte[] getEncoded()
    {
        return OEREncoder.toByteArray(new EtsiTs103097DataEncrypted(
            Ieee1609Dot2Content
                .encryptedData(encryptedData)
        ), oerDef);
    }

    public EncryptedData getEncryptedData()
    {
        return encryptedData;
    }

    public Store getRecipients()
    {
        List recipients = new ArrayList();
        for (RecipientInfo ri : encryptedData.getRecipients().getRecipientInfos())
        {
            recipients.add(new ETSIRecipientInfo(encryptedData, ri));
        }
        return new CollectionStore(recipients);
    }

}