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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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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);
    }

}