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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.cms;

import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;
import org.bouncycastle.asn1.cms.IssuerAndSerialNumber;
import org.bouncycastle.asn1.cms.KEMRecipientInfo;
import org.bouncycastle.asn1.cms.OtherRecipientInfo;
import org.bouncycastle.asn1.cms.RecipientIdentifier;
import org.bouncycastle.asn1.cms.RecipientInfo;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OperatorException;

public abstract class KEMRecipientInfoGenerator
    implements RecipientInfoGenerator
{
    protected final KEMKeyWrapper wrapper;

    private IssuerAndSerialNumber issuerAndSerial;
    private byte[] subjectKeyIdentifier;

    protected KEMRecipientInfoGenerator(IssuerAndSerialNumber issuerAndSerial, KEMKeyWrapper wrapper)
    {
        this.issuerAndSerial = issuerAndSerial;
        this.wrapper = wrapper;
    }

    protected KEMRecipientInfoGenerator(byte[] subjectKeyIdentifier, KEMKeyWrapper wrapper)
    {
        this.subjectKeyIdentifier = subjectKeyIdentifier;
        this.wrapper = wrapper;
    }

    public final RecipientInfo generate(GenericKey contentEncryptionKey)
        throws CMSException
    {
        byte[] encryptedKeyBytes;
        try
        {
            encryptedKeyBytes = wrapper.generateWrappedKey(contentEncryptionKey);
        }
        catch (OperatorException e)
        {
            throw new CMSException("exception wrapping content key: " + e.getMessage(), e);
        }

        RecipientIdentifier recipId;
        if (issuerAndSerial != null)
        {
            recipId = new RecipientIdentifier(issuerAndSerial);
        }
        else
        {
            recipId = new RecipientIdentifier(new DEROctetString(subjectKeyIdentifier));
        }

        return new RecipientInfo(new OtherRecipientInfo(CMSObjectIdentifiers.id_ori_kem,
            new KEMRecipientInfo(recipId, wrapper.getAlgorithmIdentifier(), new DEROctetString(wrapper.getEncapsulation()), wrapper.getKdfAlgorithmIdentifier(), new ASN1Integer(wrapper.getKekLength()), null, wrapper.getWrapAlgorithmIdentifier(),
            new DEROctetString(encryptedKeyBytes))));
    }
}