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package org.spongycastle.cert.crmf.jcajce;
import java.io.OutputStream;
import java.security.AlgorithmParameters;
import java.security.GeneralSecurityException;
import java.security.Provider;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.cert.crmf.CRMFException;
import org.spongycastle.jcajce.util.DefaultJcaJceHelper;
import org.spongycastle.jcajce.util.NamedJcaJceHelper;
import org.spongycastle.jcajce.util.ProviderJcaJceHelper;
import org.spongycastle.operator.GenericKey;
import org.spongycastle.operator.OutputEncryptor;
public class JceCRMFEncryptorBuilder
{
private ASN1ObjectIdentifier encryptionOID;
private int keySize;
private CRMFHelper helper = new CRMFHelper(new DefaultJcaJceHelper());
private SecureRandom random;
public JceCRMFEncryptorBuilder(ASN1ObjectIdentifier encryptionOID)
{
this(encryptionOID, -1);
}
public JceCRMFEncryptorBuilder(ASN1ObjectIdentifier encryptionOID, int keySize)
{
this.encryptionOID = encryptionOID;
this.keySize = keySize;
}
public JceCRMFEncryptorBuilder setProvider(Provider provider)
{
this.helper = new CRMFHelper(new ProviderJcaJceHelper(provider));
return this;
}
public JceCRMFEncryptorBuilder setProvider(String providerName)
{
this.helper = new CRMFHelper(new NamedJcaJceHelper(providerName));
return this;
}
public JceCRMFEncryptorBuilder setSecureRandom(SecureRandom random)
{
this.random = random;
return this;
}
public OutputEncryptor build()
throws CRMFException
{
return new CRMFOutputEncryptor(encryptionOID, keySize, random);
}
private class CRMFOutputEncryptor
implements OutputEncryptor
{
private SecretKey encKey;
private AlgorithmIdentifier algorithmIdentifier;
private Cipher cipher;
CRMFOutputEncryptor(ASN1ObjectIdentifier encryptionOID, int keySize, SecureRandom random)
throws CRMFException
{
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 (GeneralSecurityException e)
{
throw new CRMFException("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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