org.bouncycastle.cms.KEMRecipientInfoGenerator Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcpkix-debug-jdk15to18 Show documentation

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.

There is a newer version: 1.79

Show newest version

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))));
    }
}