org.bouncycastle.cms.jcajce.JceCMSMacCalculatorBuilder 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 and up. 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.cms.jcajce;

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

import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.jcajce.io.MacOutputStream;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.MacCalculator;
import org.bouncycastle.operator.jcajce.JceGenericKey;

public class JceCMSMacCalculatorBuilder
{
    private final ASN1ObjectIdentifier macOID;
    private final int                  keySize;

    private EnvelopedDataHelper helper = new EnvelopedDataHelper(new DefaultJcaJceExtHelper());
    private AlgorithmParameters algorithmParameters;
    private SecureRandom random;

    public JceCMSMacCalculatorBuilder(ASN1ObjectIdentifier macOID)
    {
        this(macOID, -1);
    }

    public JceCMSMacCalculatorBuilder(ASN1ObjectIdentifier macOID, int keySize)
    {
        this.macOID = macOID;
        this.keySize = keySize;
    }

    /**
     * Set the provider to use for content encryption.
     *
     * @param provider the provider object to use for MAC and default parameters creation.
     * @return the current builder instance.
     */
    public JceCMSMacCalculatorBuilder setProvider(Provider provider)
    {
        this.helper = new EnvelopedDataHelper(new ProviderJcaJceExtHelper(provider));

        return this;
    }

    /**
     * Set the provider to use for content encryption (by name)
     *
     * @param providerName the name of the provider to use for MAC and default parameters creation.
     * @return the current builder instance.
     */
    public JceCMSMacCalculatorBuilder setProvider(String providerName)
    {
        this.helper = new EnvelopedDataHelper(new NamedJcaJceExtHelper(providerName));

        return this;
    }

    /**
     * Provide a specified source of randomness to be used for session key and IV/nonce generation.
     *
     * @param random the secure random to use.
     * @return the current builder instance.
     */
    public JceCMSMacCalculatorBuilder setSecureRandom(SecureRandom random)
    {
        this.random = random;

        return this;
    }

    /**
     * Provide a set of algorithm parameters for the content MAC calculator to use.
     *
     * @param algorithmParameters algorithmParameters for MAC initialisation.
     * @return the current builder instance.
     */
    public JceCMSMacCalculatorBuilder setAlgorithmParameters(AlgorithmParameters algorithmParameters)
    {
        this.algorithmParameters = algorithmParameters;

        return this;
    }

    public MacCalculator build()
        throws CMSException
    {
        return new CMSMacCalculator(macOID, keySize, algorithmParameters, random);
    }

    private class CMSMacCalculator
        implements MacCalculator
    {
        private SecretKey encKey;
        private AlgorithmIdentifier algorithmIdentifier;
        private Mac mac;

        CMSMacCalculator(ASN1ObjectIdentifier macOID, int keySize, AlgorithmParameters params, SecureRandom random)
            throws CMSException
        {
            KeyGenerator keyGen = helper.createKeyGenerator(macOID);

            if (random == null)
            {
                random = new SecureRandom();
            }

            if (keySize < 0)
            {
                keyGen.init(random);
            }
            else
            {
                keyGen.init(keySize, random);
            }

            encKey = keyGen.generateKey();

            if (params == null)
            {
                params = helper.generateParameters(macOID, encKey, random);
            }

            algorithmIdentifier = helper.getAlgorithmIdentifier(macOID, params);
            mac = helper.createContentMac(encKey, algorithmIdentifier);
        }

        public AlgorithmIdentifier getAlgorithmIdentifier()
        {
            return algorithmIdentifier;
        }

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

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

        public GenericKey getKey()
        {
            return new JceGenericKey(algorithmIdentifier, encKey);
        }
    }
}