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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.DEROctetString;
import org.bouncycastle.asn1.cms.IssuerAndSerialNumber;
import org.bouncycastle.asn1.cms.KeyTransRecipientInfo;
import org.bouncycastle.asn1.cms.RecipientIdentifier;
import org.bouncycastle.asn1.cms.RecipientInfo;
import org.bouncycastle.operator.AsymmetricKeyWrapper;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OperatorException;

public abstract class KeyTransRecipientInfoGenerator
    implements RecipientInfoGenerator
{
    protected final AsymmetricKeyWrapper wrapper;

    private IssuerAndSerialNumber issuerAndSerial;
    private byte[] subjectKeyIdentifier;

    protected KeyTransRecipientInfoGenerator(IssuerAndSerialNumber issuerAndSerial, AsymmetricKeyWrapper wrapper)
    {
        this.issuerAndSerial = issuerAndSerial;
        this.wrapper = wrapper;
    }

    protected KeyTransRecipientInfoGenerator(byte[] subjectKeyIdentifier, AsymmetricKeyWrapper 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 KeyTransRecipientInfo(recipId, wrapper.getAlgorithmIdentifier(),
            new DEROctetString(encryptedKeyBytes)));
    }
}