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package org.bouncycastle.cms.jcajce;
import java.io.OutputStream;
import java.security.AlgorithmParameters;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.Provider;
import java.security.SecureRandom;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.CMSAlgorithm;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OutputEncryptor;
import org.bouncycastle.util.Integers;
public class JceCMSContentEncryptorBuilder
{
private static Map keySizes = new HashMap();
static
{
keySizes.put(CMSAlgorithm.AES128_CBC, Integers.valueOf(128));
keySizes.put(CMSAlgorithm.AES192_CBC, Integers.valueOf(192));
keySizes.put(CMSAlgorithm.AES256_CBC, Integers.valueOf(256));
keySizes.put(CMSAlgorithm.CAMELLIA128_CBC, Integers.valueOf(128));
keySizes.put(CMSAlgorithm.CAMELLIA192_CBC, Integers.valueOf(192));
keySizes.put(CMSAlgorithm.CAMELLIA256_CBC, Integers.valueOf(256));
}
private static int getKeySize(ASN1ObjectIdentifier oid)
{
Integer size = (Integer)keySizes.get(oid);
if (size != null)
{
return size.intValue();
}
return -1;
}
private ASN1ObjectIdentifier encryptionOID;
private int keySize;
private EnvelopedDataHelper helper = new EnvelopedDataHelper(new DefaultJcaJceExtHelper());
private SecureRandom random;
public JceCMSContentEncryptorBuilder(ASN1ObjectIdentifier encryptionOID)
{
this(encryptionOID, getKeySize(encryptionOID));
}
public JceCMSContentEncryptorBuilder(ASN1ObjectIdentifier encryptionOID, int keySize)
{
this.encryptionOID = encryptionOID;
this.keySize = keySize;
}
public JceCMSContentEncryptorBuilder setProvider(Provider provider)
{
this.helper = new EnvelopedDataHelper(new ProviderJcaJceExtHelper(provider));
return this;
}
public JceCMSContentEncryptorBuilder setProvider(String providerName)
{
this.helper = new EnvelopedDataHelper(new NamedJcaJceExtHelper(providerName));
return this;
}
public JceCMSContentEncryptorBuilder setSecureRandom(SecureRandom random)
{
this.random = random;
return this;
}
public OutputEncryptor build()
throws CMSException
{
return new CMSOutputEncryptor(encryptionOID, keySize, random);
}
private class CMSOutputEncryptor
implements OutputEncryptor
{
private SecretKey encKey;
private AlgorithmIdentifier algorithmIdentifier;
private Cipher cipher;
CMSOutputEncryptor(ASN1ObjectIdentifier encryptionOID, int keySize, SecureRandom random)
throws CMSException
{
KeyGenerator keyGen = helper.createKeyGenerator(encryptionOID);
if (random == null)
{
random = new SecureRandom();
}
if (keySize < 0)
{
keyGen.init(random);
}
else
{
keyGen.init(keySize, random);
}
cipher = helper.createCipher(encryptionOID);
encKey = keyGen.generateKey();
AlgorithmParameters params = helper.generateParameters(encryptionOID, encKey, random);
try
{
cipher.init(Cipher.ENCRYPT_MODE, encKey, params, random);
}
catch (InvalidKeyException e)
{
throw new CMSException("unable to initialize cipher: " + e.getMessage(), e);
}
catch (GeneralSecurityException e)
{
throw new CMSException("unable to initialize cipher: " + e.getMessage(), e);
}
//
// If params are null we try and second guess on them as some providers don't provide
// algorithm parameter generation explicity but instead generate them under the hood.
//
if (params == null)
{
params = cipher.getParameters();
}
algorithmIdentifier = helper.getAlgorithmIdentifier(encryptionOID, params);
}
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return algorithmIdentifier;
}
public OutputStream getOutputStream(OutputStream dOut)
{
return new CipherOutputStream(dOut, cipher);
}
public GenericKey getKey()
{
return new GenericKey(encKey);
}
}
}
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