org.bouncycastle.pkcs.jcajce.JcePKCS12MacCalculatorBuilder 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 java.security.SecureRandom;

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.oiw.OIWObjectIdentifiers;
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;

public class JcePKCS12MacCalculatorBuilder
    implements PKCS12MacCalculatorBuilder
{
    private JcaJceHelper helper = new DefaultJcaJceHelper();
    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 JcePKCS12MacCalculatorBuilder setIterationCount(int iterationCount)
    {
        this.iterationCount = iterationCount;

        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);

            PBEParameterSpec defParams = new PBEParameterSpec(salt, iterationCount);
            final SecretKey key = new PKCS12Key(password);

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