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. 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.

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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.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.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);
        }
    }
}