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package org.bouncycastle.operator.jcajce;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OperatorException;
import org.bouncycastle.operator.SymmetricKeyUnwrapper;
public class JceSymmetricKeyUnwrapper
extends SymmetricKeyUnwrapper
{
private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
private SecretKey secretKey;
public JceSymmetricKeyUnwrapper(AlgorithmIdentifier algorithmIdentifier, SecretKey secretKey)
{
super(algorithmIdentifier);
this.secretKey = secretKey;
}
public JceSymmetricKeyUnwrapper setProvider(Provider provider)
{
this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));
return this;
}
public JceSymmetricKeyUnwrapper setProvider(String providerName)
{
this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));
return this;
}
public GenericKey generateUnwrappedKey(AlgorithmIdentifier encryptedKeyAlgorithm, byte[] encryptedKey)
throws OperatorException
{
try
{
Cipher keyCipher = helper.createSymmetricWrapper(this.getAlgorithmIdentifier().getAlgorithm());
keyCipher.init(Cipher.UNWRAP_MODE, secretKey);
return new JceGenericKey(encryptedKeyAlgorithm, keyCipher.unwrap(encryptedKey, helper.getKeyAlgorithmName(encryptedKeyAlgorithm.getAlgorithm()), Cipher.SECRET_KEY));
}
catch (InvalidKeyException e)
{
throw new OperatorException("key invalid in message.", e);
}
catch (NoSuchAlgorithmException e)
{
throw new OperatorException("can't find algorithm.", e);
}
}
}
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