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package org.spongycastle.operator.jcajce;
import java.security.AlgorithmParameters;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.Provider;
import java.security.ProviderException;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.asn1.x509.SubjectPublicKeyInfo;
import org.spongycastle.jcajce.DefaultJcaJceHelper;
import org.spongycastle.jcajce.NamedJcaJceHelper;
import org.spongycastle.jcajce.ProviderJcaJceHelper;
import org.spongycastle.operator.AsymmetricKeyWrapper;
import org.spongycastle.operator.GenericKey;
import org.spongycastle.operator.OperatorException;
public class JceAsymmetricKeyWrapper
extends AsymmetricKeyWrapper
{
private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
private Map extraMappings = new HashMap();
private PublicKey publicKey;
private SecureRandom random;
public JceAsymmetricKeyWrapper(PublicKey publicKey)
{
super(SubjectPublicKeyInfo.getInstance(publicKey.getEncoded()).getAlgorithm());
this.publicKey = publicKey;
}
public JceAsymmetricKeyWrapper(X509Certificate certificate)
{
this(certificate.getPublicKey());
}
/**
* Create a wrapper, overriding the algorithm type that is stored in the public key.
*
* @param algorithmIdentifier identifier for encryption algorithm to be used.
* @param publicKey the public key to be used.
*/
public JceAsymmetricKeyWrapper(AlgorithmIdentifier algorithmIdentifier, PublicKey publicKey)
{
super(algorithmIdentifier);
this.publicKey = publicKey;
}
public JceAsymmetricKeyWrapper setProvider(Provider provider)
{
this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));
return this;
}
public JceAsymmetricKeyWrapper setProvider(String providerName)
{
this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));
return this;
}
public JceAsymmetricKeyWrapper setSecureRandom(SecureRandom random)
{
this.random = random;
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 Wrapper.
*/
public JceAsymmetricKeyWrapper setAlgorithmMapping(ASN1ObjectIdentifier algorithm, String algorithmName)
{
extraMappings.put(algorithm, algorithmName);
return this;
}
public byte[] generateWrappedKey(GenericKey encryptionKey)
throws OperatorException
{
Cipher keyEncryptionCipher = helper.createAsymmetricWrapper(getAlgorithmIdentifier().getAlgorithm(), extraMappings);
AlgorithmParameters algParams = helper.createAlgorithmParameters(this.getAlgorithmIdentifier());
byte[] encryptedKeyBytes = null;
try
{
if (algParams != null)
{
keyEncryptionCipher.init(Cipher.WRAP_MODE, publicKey, algParams, random);
}
else
{
keyEncryptionCipher.init(Cipher.WRAP_MODE, publicKey, random);
}
encryptedKeyBytes = keyEncryptionCipher.wrap(OperatorUtils.getJceKey(encryptionKey));
}
catch (InvalidKeyException e)
{
}
catch (GeneralSecurityException e)
{
}
catch (IllegalStateException e)
{
}
catch (UnsupportedOperationException e)
{
}
catch (ProviderException e)
{
}
// some providers do not support WRAP (this appears to be only for asymmetric algorithms)
if (encryptedKeyBytes == null)
{
try
{
keyEncryptionCipher.init(Cipher.ENCRYPT_MODE, publicKey, random);
encryptedKeyBytes = keyEncryptionCipher.doFinal(OperatorUtils.getJceKey(encryptionKey).getEncoded());
}
catch (InvalidKeyException e)
{
throw new OperatorException("unable to encrypt contents key", e);
}
catch (GeneralSecurityException e)
{
throw new OperatorException("unable to encrypt contents key", e);
}
}
return encryptedKeyBytes;
}
}
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