org.bouncycastle.pkcs.jcajce.JcePKCS12MacCalculatorBuilder Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcpkix-fips Show documentation

The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

There is a newer version: 2.0.7

Show newest version

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);
        }
    }
}