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package org.bouncycastle.openssl.jcajce;
import java.io.IOException;
import java.io.InputStream;
import java.security.AlgorithmParameters;
import java.security.GeneralSecurityException;
import java.security.Provider;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import org.bouncycastle.asn1.pkcs.EncryptionScheme;
import org.bouncycastle.asn1.pkcs.KeyDerivationFunc;
import org.bouncycastle.asn1.pkcs.PBEParameter;
import org.bouncycastle.asn1.pkcs.PBES2Parameters;
import org.bouncycastle.asn1.pkcs.PBKDF2Params;
import org.bouncycastle.asn1.pkcs.PKCS12PBEParams;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.JcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.openssl.PEMException;
import org.bouncycastle.operator.InputDecryptor;
import org.bouncycastle.operator.InputDecryptorProvider;
import org.bouncycastle.operator.OperatorCreationException;
public class JceOpenSSLPKCS8DecryptorProviderBuilder
{
private JcaJceHelper helper = new DefaultJcaJceHelper();
public JceOpenSSLPKCS8DecryptorProviderBuilder()
{
helper = new DefaultJcaJceHelper();
}
public JceOpenSSLPKCS8DecryptorProviderBuilder setProvider(String providerName)
{
helper = new NamedJcaJceHelper(providerName);
return this;
}
public JceOpenSSLPKCS8DecryptorProviderBuilder setProvider(Provider provider)
{
helper = new ProviderJcaJceHelper(provider);
return this;
}
public InputDecryptorProvider build(final char[] password)
throws OperatorCreationException
{
return new InputDecryptorProvider()
{
public InputDecryptor get(final AlgorithmIdentifier algorithm)
throws OperatorCreationException
{
final Cipher cipher;
try
{
if (PEMUtilities.isPKCS5Scheme2(algorithm.getAlgorithm()))
{
PBES2Parameters params = PBES2Parameters.getInstance(algorithm.getParameters());
KeyDerivationFunc func = params.getKeyDerivationFunc();
EncryptionScheme scheme = params.getEncryptionScheme();
PBKDF2Params defParams = (PBKDF2Params)func.getParameters();
int iterationCount = defParams.getIterationCount().intValue();
byte[] salt = defParams.getSalt();
String oid = scheme.getAlgorithm().getId();
SecretKey key = PEMUtilities.generateSecretKeyForPKCS5Scheme2(oid, password, salt, iterationCount);
cipher = helper.createCipher(oid);
AlgorithmParameters algParams = helper.createAlgorithmParameters(oid);
algParams.init(scheme.getParameters().toASN1Primitive().getEncoded());
cipher.init(Cipher.DECRYPT_MODE, key, algParams);
}
else if (PEMUtilities.isPKCS12(algorithm.getAlgorithm()))
{
PKCS12PBEParams params = PKCS12PBEParams.getInstance(algorithm.getParameters());
PBEKeySpec pbeSpec = new PBEKeySpec(password);
SecretKeyFactory secKeyFact = helper.createSecretKeyFactory(algorithm.getAlgorithm().getId());
PBEParameterSpec defParams = new PBEParameterSpec(params.getIV(), params.getIterations().intValue());
cipher = helper.createCipher(algorithm.getAlgorithm().getId());
cipher.init(Cipher.DECRYPT_MODE, secKeyFact.generateSecret(pbeSpec), defParams);
}
else if (PEMUtilities.isPKCS5Scheme1(algorithm.getAlgorithm()))
{
PBEParameter params = PBEParameter.getInstance(algorithm.getParameters());
PBEKeySpec pbeSpec = new PBEKeySpec(password);
SecretKeyFactory secKeyFact = helper.createSecretKeyFactory(algorithm.getAlgorithm().getId());
PBEParameterSpec defParams = new PBEParameterSpec(params.getSalt(), params.getIterationCount().intValue());
cipher = helper.createCipher(algorithm.getAlgorithm().getId());
cipher.init(Cipher.DECRYPT_MODE, secKeyFact.generateSecret(pbeSpec), defParams);
}
else
{
throw new PEMException("Unknown algorithm: " + algorithm.getAlgorithm());
}
return new InputDecryptor()
{
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return algorithm;
}
public InputStream getInputStream(InputStream encIn)
{
return new CipherInputStream(encIn, cipher);
}
};
}
catch (IOException e)
{
throw new OperatorCreationException(algorithm.getAlgorithm() + " not available: " + e.getMessage(), e);
}
catch (GeneralSecurityException e)
{
throw new OperatorCreationException(algorithm.getAlgorithm() + " not available: " + e.getMessage(), e);
}
};
};
}
}
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