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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.cms;

import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.cms.KEKIdentifier;
import org.bouncycastle.asn1.cms.KEKRecipientInfo;
import org.bouncycastle.asn1.cms.RecipientInfo;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OperatorException;
import org.bouncycastle.operator.SymmetricKeyWrapper;

public abstract class KEKRecipientInfoGenerator
    implements RecipientInfoGenerator
{
    private final KEKIdentifier kekIdentifier;

    protected final SymmetricKeyWrapper wrapper;

    protected KEKRecipientInfoGenerator(KEKIdentifier kekIdentifier, SymmetricKeyWrapper wrapper)
    {
        this.kekIdentifier = kekIdentifier;
        this.wrapper = wrapper;
    }

    public final RecipientInfo generate(GenericKey contentEncryptionKey)
        throws CMSException
    {
        try
        {
            ASN1OctetString encryptedKey = new DEROctetString(wrapper.generateWrappedKey(contentEncryptionKey));

            return new RecipientInfo(new KEKRecipientInfo(kekIdentifier, wrapper.getAlgorithmIdentifier(), encryptedKey));
        }
        catch (OperatorException e)
        {
            throw new CMSException("exception wrapping content key: " + e.getMessage(), e);
        }
    }
}