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Viewing changes to src/org/bouncycastle/cms/jcajce/JceKEKRecipient.java

  • Committer: Brian Thomason
  • Date: 2011-12-20 17:20:32 UTC
  • Revision ID: brian.thomason@canonical.com-20111220172032-rdtm13jgdxtksacr
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src/org/bouncycastle/cms/jcajce/JceKEKRecipient.java
 
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package org.bouncycastle.cms.jcajce;
 
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import java.security.Key;
 
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import java.security.Provider;
 
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import javax.crypto.SecretKey;
 
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import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
 
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import org.bouncycastle.cms.CMSException;
 
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import org.bouncycastle.cms.KEKRecipient;
 
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import org.bouncycastle.jcajce.DefaultJcaJceHelper;
 
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import org.bouncycastle.jcajce.NamedJcaJceHelper;
 
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import org.bouncycastle.jcajce.ProviderJcaJceHelper;
 
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import org.bouncycastle.operator.OperatorException;
 
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import org.bouncycastle.operator.SymmetricKeyUnwrapper;
 
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public abstract class JceKEKRecipient
 
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    implements KEKRecipient
 
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{
 
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    private SecretKey recipientKey;
 
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    protected EnvelopedDataHelper helper = new EnvelopedDataHelper(new DefaultJcaJceHelper());
 
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    protected EnvelopedDataHelper contentHelper = helper;
 
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    public JceKEKRecipient(SecretKey recipientKey)
 
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    {
 
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        this.recipientKey = recipientKey;
 
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    }
 
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    /**
 
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     * Set the provider to use for key recovery and content processing.
 
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     *
 
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     * @param provider provider to use.
 
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     * @return this recipient.
 
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     */
 
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    public JceKEKRecipient setProvider(Provider provider)
 
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    {
 
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        this.helper = new EnvelopedDataHelper(new ProviderJcaJceHelper(provider));
 
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        this.contentHelper = helper;
 
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        return this;
 
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    }
 
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    /**
 
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     * Set the provider to use for key recovery and content processing.
 
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     *
 
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     * @param providerName the name of the provider to use.
 
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     * @return this recipient.
 
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     */
 
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    public JceKEKRecipient setProvider(String providerName)
 
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    {
 
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        this.helper = new EnvelopedDataHelper(new NamedJcaJceHelper(providerName));
 
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        this.contentHelper = helper;
 
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        return this;
 
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    }
 
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    /**
 
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     * Set the provider to use for content processing.
 
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     *
 
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     * @param provider the provider to use.
 
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     * @return this recipient.
 
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     */
 
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    public JceKEKRecipient setContentProvider(Provider provider)
 
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    {
 
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        this.contentHelper = new EnvelopedDataHelper(new ProviderJcaJceHelper(provider));
 
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        return this;
 
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    }
 
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    /**
 
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     * Set the provider to use for content processing.
 
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     *
 
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     * @param providerName the name of the provider to use.
 
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     * @return this recipient.
 
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     */
 
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    public JceKEKRecipient setContentProvider(String providerName)
 
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    {
 
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        this.contentHelper = new EnvelopedDataHelper(new NamedJcaJceHelper(providerName));
 
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        return this;
 
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    }
 
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    protected Key extractSecretKey(AlgorithmIdentifier keyEncryptionAlgorithm, AlgorithmIdentifier contentEncryptionAlgorithm, byte[] encryptedContentEncryptionKey)
 
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        throws CMSException
 
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    {
 
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        SymmetricKeyUnwrapper unwrapper = helper.createSymmetricUnwrapper(keyEncryptionAlgorithm, recipientKey);
 
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        try
 
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        {
 
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            return CMSUtils.getJceKey(unwrapper.generateUnwrappedKey(contentEncryptionAlgorithm, encryptedContentEncryptionKey));
 
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        }
 
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        catch (OperatorException e)
 
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        {
 
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            throw new CMSException("exception unwrapping key: " + e.getMessage(), e);
 
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        }
 
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    }
 
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}