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package org.spongycastle.pkcs.jcajce;
import java.io.OutputStream;
import java.security.Provider;
import java.security.SecureRandom;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.DERNull;
import org.spongycastle.asn1.oiw.OIWObjectIdentifiers;
import org.spongycastle.asn1.pkcs.PKCS12PBEParams;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.crypto.ExtendedDigest;
import org.spongycastle.crypto.generators.PKCS12ParametersGenerator;
import org.spongycastle.jcajce.DefaultJcaJceHelper;
import org.spongycastle.jcajce.JcaJceHelper;
import org.spongycastle.jcajce.NamedJcaJceHelper;
import org.spongycastle.jcajce.ProviderJcaJceHelper;
import org.spongycastle.jcajce.io.MacOutputStream;
import org.spongycastle.operator.GenericKey;
import org.spongycastle.operator.MacCalculator;
import org.spongycastle.operator.OperatorCreationException;
import org.spongycastle.pkcs.PKCS12MacCalculatorBuilder;
public class JcePKCS12MacCalculatorBuilder
implements PKCS12MacCalculatorBuilder
{
private JcaJceHelper helper = new DefaultJcaJceHelper();
private ExtendedDigest digest;
private ASN1ObjectIdentifier algorithm;
private SecureRandom random;
private int saltLength;
private int iterationCount = 1024;
public JcePKCS12MacCalculatorBuilder()
{
this(OIWObjectIdentifiers.idSHA1);
}
public JcePKCS12MacCalculatorBuilder(ASN1ObjectIdentifier hashAlgorithm)
{
this.algorithm = hashAlgorithm;
}
public JcePKCS12MacCalculatorBuilder setProvider(Provider provider)
{
this.helper = new ProviderJcaJceHelper(provider);
return this;
}
public JcePKCS12MacCalculatorBuilder setProvider(String providerName)
{
this.helper = new NamedJcaJceHelper(providerName);
return this;
}
public AlgorithmIdentifier getDigestAlgorithmIdentifier()
{
return new AlgorithmIdentifier(algorithm, DERNull.INSTANCE);
}
public MacCalculator build(final char[] password)
throws OperatorCreationException
{
if (random == null)
{
random = new SecureRandom();
}
try
{
final Mac mac = helper.createMac(algorithm.getId());
saltLength = mac.getMacLength();
final byte[] salt = new byte[saltLength];
random.nextBytes(salt);
SecretKeyFactory keyFact = helper.createSecretKeyFactory(algorithm.getId());
PBEParameterSpec defParams = new PBEParameterSpec(salt, iterationCount);
PBEKeySpec pbeSpec = new PBEKeySpec(password);
SecretKey key = keyFact.generateSecret(pbeSpec);
mac.init(key, defParams);
return new MacCalculator()
{
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return new AlgorithmIdentifier(algorithm, new PKCS12PBEParams(salt, iterationCount));
}
public OutputStream getOutputStream()
{
return new MacOutputStream(mac);
}
public byte[] getMac()
{
return mac.doFinal();
}
public GenericKey getKey()
{
return new GenericKey(getAlgorithmIdentifier(), PKCS12ParametersGenerator.PKCS12PasswordToBytes(password));
}
};
}
catch (Exception e)
{
throw new OperatorCreationException("unable to create MAC calculator: " + e.getMessage(), e);
}
}
}
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