org.bouncycastle.its.jcajce.JcaITSContentSigner 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.its.jcajce;

import java.io.IOException;
import java.io.OutputStream;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.Signature;
import java.security.interfaces.ECPrivateKey;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.sec.SECObjectIdentifiers;
import org.bouncycastle.asn1.teletrust.TeleTrusTObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.its.ITSCertificate;
import org.bouncycastle.its.operator.ITSContentSigner;
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.DigestCalculator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;
import org.bouncycastle.util.Arrays;

public class JcaITSContentSigner
    implements ITSContentSigner
{
    public static class Builder
    {
        private JcaJceHelper helper = new DefaultJcaJceHelper();

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

            return this;
        }

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

            return this;
        }

        public JcaITSContentSigner build(PrivateKey privateKey)
        {
            return new JcaITSContentSigner((ECPrivateKey)privateKey, null, helper);
        }

        public JcaITSContentSigner build(PrivateKey privateKey, ITSCertificate signerCert)
        {
            return new JcaITSContentSigner((ECPrivateKey)privateKey, signerCert, helper);
        }
    }

    private final ECPrivateKey privateKey;
    private final ITSCertificate signerCert;
    private final AlgorithmIdentifier digestAlgo;
    private final DigestCalculator digest;
    private final byte[] parentData;
    private final ASN1ObjectIdentifier curveID;
    private final byte[] parentDigest;
    private final String signer;
    private final JcaJceHelper helper;

    private JcaITSContentSigner(ECPrivateKey privateKey, ITSCertificate signerCert, JcaJceHelper helper)
    {
        this.privateKey = privateKey;
        this.signerCert = signerCert;
        this.helper = helper;

        //
        // Probably the most generic way at the moment.
        //

        PrivateKeyInfo pkInfo = PrivateKeyInfo.getInstance(privateKey.getEncoded());
        curveID = ASN1ObjectIdentifier.getInstance(pkInfo.getPrivateKeyAlgorithm().getParameters());

        if (curveID.equals(SECObjectIdentifiers.secp256r1))
        {
            digestAlgo = new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha256);
            signer = "SHA256withECDSA";
        }
        else if (curveID.equals(TeleTrusTObjectIdentifiers.brainpoolP256r1))
        {
            digestAlgo = new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha256);
            signer = "SHA256withECDSA";
        }
        else if (curveID.equals(TeleTrusTObjectIdentifiers.brainpoolP384r1))
        {
            digestAlgo = new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha384);
            signer = "SHA384withECDSA";
        }
        else
        {
            throw new IllegalArgumentException("unknown key type");
        }

        DigestCalculatorProvider digestCalculatorProvider;

        try
        {

            JcaDigestCalculatorProviderBuilder bld = new JcaDigestCalculatorProviderBuilder().setHelper(helper);
            digestCalculatorProvider = bld.build();
        }
        catch (Exception ex)
        {
            throw new IllegalStateException(ex.getMessage(), ex);
        }

        try
        {
            digest = digestCalculatorProvider.get(digestAlgo);
        }
        catch (OperatorCreationException e)
        {
            throw new IllegalStateException("cannot recognise digest type: " + digestAlgo.getAlgorithm(), e);
        }

        if (signerCert != null)
        {
            try
            {
                parentData = signerCert.getEncoded();
                digest.getOutputStream().write(parentData, 0, parentData.length);
                parentDigest = digest.getDigest();
            }
            catch (IOException e)
            {
                throw new IllegalStateException("signer certificate encoding failed: " + e.getMessage());
            }
        }
        else
        {
            // self signed so we use a null digest for the parent.
            this.parentData = null;
            this.parentDigest = digest.getDigest();
        }

    }

    @Override
    public OutputStream getOutputStream()
    {
        return digest.getOutputStream();
    }

    @Override
    public byte[] getSignature()
    {
        byte[] clientCertDigest = digest.getDigest();
        Signature signature;
        try
        {
            signature = helper.createSignature(signer);
            signature.initSign(privateKey);
            signature.update(clientCertDigest, 0, clientCertDigest.length);
            signature.update(digest.getDigest());
            return signature.sign();
        }
        catch (Exception e)
        {
            throw new RuntimeException(e.getMessage(), e);
        }
    }

    @Override
    public ITSCertificate getAssociatedCertificate()
    {
        return signerCert;
    }

    @Override
    public byte[] getAssociatedCertificateDigest()
    {
        return Arrays.clone(parentDigest);
    }

    @Override
    public AlgorithmIdentifier getDigestAlgorithm()
    {
        return digestAlgo;
    }

    @Override
    public boolean isForSelfSigning()
    {
        return parentData == null;
    }
}