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package org.spongycastle.cms.bc;
import java.io.InputStream;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.cms.CMSException;
import org.spongycastle.cms.RecipientOperator;
import org.spongycastle.crypto.BufferedBlockCipher;
import org.spongycastle.crypto.StreamCipher;
import org.spongycastle.crypto.params.KeyParameter;
import org.spongycastle.operator.InputDecryptor;
import org.spongycastle.operator.bc.BcSymmetricKeyUnwrapper;
public class BcKEKEnvelopedRecipient
extends BcKEKRecipient
{
public BcKEKEnvelopedRecipient(BcSymmetricKeyUnwrapper unwrapper)
{
super(unwrapper);
}
public RecipientOperator getRecipientOperator(AlgorithmIdentifier keyEncryptionAlgorithm, final AlgorithmIdentifier contentEncryptionAlgorithm, byte[] encryptedContentEncryptionKey)
throws CMSException
{
KeyParameter secretKey = (KeyParameter)extractSecretKey(keyEncryptionAlgorithm, contentEncryptionAlgorithm, encryptedContentEncryptionKey);
final Object dataCipher = EnvelopedDataHelper.createContentCipher(false, secretKey, contentEncryptionAlgorithm);
return new RecipientOperator(new InputDecryptor()
{
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return contentEncryptionAlgorithm;
}
public InputStream getInputStream(InputStream dataOut)
{
if (dataCipher instanceof BufferedBlockCipher)
{
return new org.spongycastle.crypto.io.CipherInputStream(dataOut, (BufferedBlockCipher)dataCipher);
}
else
{
return new org.spongycastle.crypto.io.CipherInputStream(dataOut, (StreamCipher)dataCipher);
}
}
});
}
}
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