org.bouncycastle.cert.crmf.jcajce.JcePKMACValuesCalculator 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 1.5 to JDK 1.8. 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.cert.crmf.jcajce;

import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.Provider;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cert.crmf.CRMFException;
import org.bouncycastle.cert.crmf.PKMACValuesCalculator;
import org.bouncycastle.jcajce.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.NamedJcaJceHelper;
import org.bouncycastle.jcajce.ProviderJcaJceHelper;

public class JcePKMACValuesCalculator
    implements PKMACValuesCalculator
{
    private MessageDigest digest;
    private Mac           mac;
    private CRMFHelper    helper;

    public JcePKMACValuesCalculator()
    {
        this.helper = new CRMFHelper(new DefaultJcaJceHelper());
    }

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

        return this;
    }

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

        return this;
    }

    public void setup(AlgorithmIdentifier digAlg, AlgorithmIdentifier macAlg)
        throws CRMFException
    {
        digest = helper.createDigest(digAlg.getAlgorithm());
        mac = helper.createMac(macAlg.getAlgorithm());
    }

    public byte[] calculateDigest(byte[] data)
    {
        return digest.digest(data);
    }

    public byte[] calculateMac(byte[] pwd, byte[] data)
        throws CRMFException
    {
        try
        {
            mac.init(new SecretKeySpec(pwd, mac.getAlgorithm()));

            return mac.doFinal(data);
        }
        catch (GeneralSecurityException e)
        {
            throw new CRMFException("failure in setup: " + e.getMessage(), e);
        }
    }
}