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

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcpkix-jdk14 Show documentation

The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.4. 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 java.io.IOException;
import java.security.Key;
import java.security.NoSuchProviderException;
import java.security.Provider;

import javax.crypto.SecretKey;

import org.bouncycastle.asn1.cms.KEKIdentifier;
import org.bouncycastle.asn1.cms.KEKRecipientInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.jcajce.JceKEKAuthenticatedRecipient;
import org.bouncycastle.cms.jcajce.JceKEKEnvelopedRecipient;
import org.bouncycastle.cms.jcajce.JceKEKRecipient;

/**
 * the RecipientInfo class for a recipient who has been sent a message
 * encrypted using a secret key known to the other side.
 */
public class KEKRecipientInformation
    extends RecipientInformation
{
    private KEKRecipientInfo      info;

    KEKRecipientInformation(
        KEKRecipientInfo        info,
        AlgorithmIdentifier     messageAlgorithm,
        CMSSecureReadable       secureReadable,
        AuthAttributesProvider  additionalData)
    {
        super(info.getKeyEncryptionAlgorithm(), messageAlgorithm, secureReadable, additionalData);

        this.info = info;

        KEKIdentifier kekId = info.getKekid();

        this.rid = new KEKRecipientId(kekId.getKeyIdentifier().getOctets());
    }

    /**
     * decrypt the content and return an input stream.
     */
    public CMSTypedStream getContentStream(
        Key      key,
        String   prov)
        throws CMSException, NoSuchProviderException
    {
        return getContentStream(key, CMSUtils.getProvider(prov));
    }

    /**
     * decrypt the content and return an input stream.
     * @deprecated use getContentStream(Recipient)
     */
    public CMSTypedStream getContentStream(
        Key      key,
        Provider prov)
        throws CMSException
    {
        try
        {
            JceKEKRecipient recipient;

            if (secureReadable instanceof CMSEnvelopedHelper.CMSEnvelopedSecureReadable)
            {
                recipient = new JceKEKEnvelopedRecipient((SecretKey)key);
            }
            else
            {
                recipient = new JceKEKAuthenticatedRecipient((SecretKey)key);
            }

            if (prov != null)
            {
                recipient.setProvider(prov);
            }

            return getContentStream(recipient);
        }
        catch (IOException e)
        {
            throw new CMSException("encoding error: " + e.getMessage(), e);
        }
    }

    protected RecipientOperator getRecipientOperator(Recipient recipient)
        throws CMSException, IOException
    {
        return ((KEKRecipient)recipient).getRecipientOperator(keyEncAlg, messageAlgorithm, info.getEncryptedKey().getOctets());
    }
}