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package org.bouncycastle.operator.jcajce;
import java.security.AlgorithmParameters;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.ProviderException;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
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.AsymmetricKeyUnwrapper;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OperatorException;
public class JceAsymmetricKeyUnwrapper
extends AsymmetricKeyUnwrapper
{
private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
private Map extraMappings = new HashMap();
private PrivateKey privKey;
public JceAsymmetricKeyUnwrapper(AlgorithmIdentifier algorithmIdentifier, PrivateKey privKey)
{
super(algorithmIdentifier);
this.privKey = privKey;
}
public JceAsymmetricKeyUnwrapper setProvider(Provider provider)
{
this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));
return this;
}
public JceAsymmetricKeyUnwrapper setProvider(String providerName)
{
this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));
return this;
}
/**
* Internally algorithm ids are converted into cipher names using a lookup table. For some providers
* the standard lookup table won't work. Use this method to establish a specific mapping from an
* algorithm identifier to a specific algorithm.
* <p>
* For example:
* <pre>
* unwrapper.setAlgorithmMapping(PKCSObjectIdentifiers.rsaEncryption, "RSA");
* </pre>
* </p>
* @param algorithm OID of algorithm in recipient.
* @param algorithmName JCE algorithm name to use.
* @return the current Unwrapper.
*/
public JceAsymmetricKeyUnwrapper setAlgorithmMapping(ASN1ObjectIdentifier algorithm, String algorithmName)
{
extraMappings.put(algorithm, algorithmName);
return this;
}
public GenericKey generateUnwrappedKey(AlgorithmIdentifier encryptedKeyAlgorithm, byte[] encryptedKey)
throws OperatorException
{
try
{
Key sKey = null;
Cipher keyCipher = helper.createAsymmetricWrapper(this.getAlgorithmIdentifier().getAlgorithm(), extraMappings);
AlgorithmParameters algParams = helper.createAlgorithmParameters(this.getAlgorithmIdentifier());
try
{
if (algParams != null)
{
keyCipher.init(Cipher.UNWRAP_MODE, privKey, algParams);
}
else
{
keyCipher.init(Cipher.UNWRAP_MODE, privKey);
}
sKey = keyCipher.unwrap(encryptedKey, helper.getKeyAlgorithmName(encryptedKeyAlgorithm.getAlgorithm()), Cipher.SECRET_KEY);
}
catch (GeneralSecurityException e)
{
}
catch (IllegalStateException e)
{
}
catch (UnsupportedOperationException e)
{
}
catch (ProviderException e)
{
}
// some providers do not support UNWRAP (this appears to be only for asymmetric algorithms)
if (sKey == null)
{
keyCipher.init(Cipher.DECRYPT_MODE, privKey);
sKey = new SecretKeySpec(keyCipher.doFinal(encryptedKey), encryptedKeyAlgorithm.getAlgorithm().getId());
}
return new JceGenericKey(encryptedKeyAlgorithm, sKey);
}
catch (InvalidKeyException e)
{
throw new OperatorException("key invalid: " + e.getMessage(), e);
}
catch (IllegalBlockSizeException e)
{
throw new OperatorException("illegal blocksize: " + e.getMessage(), e);
}
catch (BadPaddingException e)
{
throw new OperatorException("bad padding: " + e.getMessage(), e);
}
}
}
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