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package org.spongycastle.cms.bc;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.cms.CMSException;
import org.spongycastle.cms.KEKRecipient;
import org.spongycastle.crypto.CipherParameters;
import org.spongycastle.operator.OperatorException;
import org.spongycastle.operator.SymmetricKeyUnwrapper;
import org.spongycastle.operator.bc.BcSymmetricKeyUnwrapper;
public abstract class BcKEKRecipient
implements KEKRecipient
{
private SymmetricKeyUnwrapper unwrapper;
public BcKEKRecipient(BcSymmetricKeyUnwrapper unwrapper)
{
this.unwrapper = unwrapper;
}
protected CipherParameters extractSecretKey(AlgorithmIdentifier keyEncryptionAlgorithm, AlgorithmIdentifier contentEncryptionAlgorithm, byte[] encryptedContentEncryptionKey)
throws CMSException
{
try
{
return CMSUtils.getBcKey(unwrapper.generateUnwrappedKey(contentEncryptionAlgorithm, encryptedContentEncryptionKey));
}
catch (OperatorException e)
{
throw new CMSException("exception unwrapping key: " + e.getMessage(), e);
}
}
}
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