org.bouncycastle.pkcs.jcajce.JcePKCS12MacCalculatorBuilderProvider Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.4. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.pkcs.jcajce;

import java.io.OutputStream;
import java.security.Provider;

import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.PBEParameterSpec;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.pkcs.PKCS12PBEParams;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jcajce.PKCS12Key;
import org.bouncycastle.jcajce.io.MacOutputStream;
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.operator.GenericKey;
import org.bouncycastle.operator.MacCalculator;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.pkcs.PKCS12MacCalculatorBuilder;
import org.bouncycastle.pkcs.PKCS12MacCalculatorBuilderProvider;

public class JcePKCS12MacCalculatorBuilderProvider
    implements PKCS12MacCalculatorBuilderProvider
{
    private JcaJceHelper helper = new DefaultJcaJceHelper();

    public JcePKCS12MacCalculatorBuilderProvider()
    {
    }

    public JcePKCS12MacCalculatorBuilderProvider setProvider(Provider provider)
    {
        this.helper = new ProviderJcaJceHelper(provider);

        return this;
    }

    public JcePKCS12MacCalculatorBuilderProvider setProvider(String providerName)
    {
        this.helper = new NamedJcaJceHelper(providerName);

        return this;
    }

    public PKCS12MacCalculatorBuilder get(final AlgorithmIdentifier algorithmIdentifier)
    {
        return new PKCS12MacCalculatorBuilder()
        {
            public MacCalculator build(final char[] password)
                throws OperatorCreationException
            {
                final PKCS12PBEParams pbeParams = PKCS12PBEParams.getInstance(algorithmIdentifier.getParameters());

                try
                {
                    final ASN1ObjectIdentifier algorithm = algorithmIdentifier.getAlgorithm();

                    final Mac mac = helper.createMac(algorithm.getId());

                    PBEParameterSpec defParams = new PBEParameterSpec(pbeParams.getIV(), pbeParams.getIterations().intValue());

                    final SecretKey key = new PKCS12Key(password);

                    mac.init(key, defParams);

                    return new MacCalculator()
                    {
                        public AlgorithmIdentifier getAlgorithmIdentifier()
                        {
                            return new AlgorithmIdentifier(algorithm, pbeParams);
                        }

                        public OutputStream getOutputStream()
                        {
                            return new MacOutputStream(mac);
                        }

                        public byte[] getMac()
                        {
                            return mac.doFinal();
                        }

                        public GenericKey getKey()
                        {
                            return new GenericKey(getAlgorithmIdentifier(), key.getEncoded());
                        }
                    };
                }
                catch (Exception e)
                {
                    throw new OperatorCreationException("unable to create MAC calculator: " + e.getMessage(), e);
                }
            }

            public AlgorithmIdentifier getDigestAlgorithmIdentifier()
            {
                return new AlgorithmIdentifier(algorithmIdentifier.getAlgorithm(), DERNull.INSTANCE);
            }
        };
    }
}