org.bouncycastle.operator.jcajce.JcaContentSignerBuilder 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.operator.jcajce;

import java.io.IOException;
import java.io.OutputStream;
import java.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.SignatureException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.MGF1ParameterSpec;
import java.security.spec.PSSParameterSpec;
import java.util.List;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.misc.MiscObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.RSASSAPSSparams;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jcajce.CompositePrivateKey;
import org.bouncycastle.jcajce.io.OutputStreamFactory;
import org.bouncycastle.jcajce.spec.CompositeAlgorithmSpec;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.DefaultDigestAlgorithmIdentifierFinder;
import org.bouncycastle.operator.DefaultSignatureAlgorithmIdentifierFinder;
import org.bouncycastle.operator.DigestAlgorithmIdentifierFinder;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.RuntimeOperatorException;
import org.bouncycastle.operator.SignatureAlgorithmIdentifierFinder;
import org.bouncycastle.util.io.TeeOutputStream;

public class JcaContentSignerBuilder
{
    private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
    private SecureRandom random;
    private String signatureAlgorithm;
    private AlgorithmIdentifier sigAlgId;
    private AlgorithmParameterSpec sigAlgSpec;

    public JcaContentSignerBuilder(String signatureAlgorithm)
    {
        this.signatureAlgorithm = signatureAlgorithm;
        this.sigAlgId = new DefaultSignatureAlgorithmIdentifierFinder().find(signatureAlgorithm);
        this.sigAlgSpec = null;
    }

    public JcaContentSignerBuilder(String signatureAlgorithm, AlgorithmParameterSpec sigParamSpec)
    {
        this.signatureAlgorithm = signatureAlgorithm;

        if (sigParamSpec instanceof PSSParameterSpec)
        {
            PSSParameterSpec pssSpec = (PSSParameterSpec)sigParamSpec;

            this.sigAlgSpec = pssSpec;
            this.sigAlgId = new AlgorithmIdentifier(
                                    PKCSObjectIdentifiers.id_RSASSA_PSS, createPSSParams(pssSpec));
        }
        else if (sigParamSpec instanceof CompositeAlgorithmSpec)
        {
            CompositeAlgorithmSpec compSpec = (CompositeAlgorithmSpec)sigParamSpec;

            this.sigAlgSpec = compSpec;
            this.sigAlgId = new AlgorithmIdentifier(
                                    MiscObjectIdentifiers.id_alg_composite, createCompParams(compSpec));
        }
        else
        {
            throw new IllegalArgumentException("unknown sigParamSpec: "
                            + ((sigParamSpec == null) ? "null" : sigParamSpec.getClass().getName()));
        }
    }

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

        return this;
    }

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

        return this;
    }

    public JcaContentSignerBuilder setSecureRandom(SecureRandom random)
    {
        this.random = random;

        return this;
    }

    public ContentSigner build(PrivateKey privateKey)
        throws OperatorCreationException
    {
        if (privateKey instanceof CompositePrivateKey)
        {
            return buildComposite((CompositePrivateKey)privateKey);
        }
        
        try
        {
            final Signature sig = helper.createSignature(sigAlgId);
            final AlgorithmIdentifier signatureAlgId = sigAlgId;

            if (random != null)
            {
                sig.initSign(privateKey, random);
            }
            else
            {
                sig.initSign(privateKey);
            }

            return new ContentSigner()
            {
                private OutputStream stream = OutputStreamFactory.createStream(sig);

                public AlgorithmIdentifier getAlgorithmIdentifier()
                {
                    return signatureAlgId;
                }

                public OutputStream getOutputStream()
                {
                    return stream;
                }

                public byte[] getSignature()
                {
                    try
                    {
                        return sig.sign();
                    }
                    catch (SignatureException e)
                    {
                        throw new RuntimeOperatorException("exception obtaining signature: " + e.getMessage(), e);
                    }
                }
            };
        }
        catch (GeneralSecurityException e)
        {
            throw new OperatorCreationException("cannot create signer: " + e.getMessage(), e);
        }
    }

    private ContentSigner buildComposite(CompositePrivateKey privateKey)
        throws OperatorCreationException
    {
        try
        {
            List privateKeys = privateKey.getPrivateKeys();
            final ASN1Sequence sigAlgIds = ASN1Sequence.getInstance(sigAlgId.getParameters());
            final Signature[] sigs = new Signature[sigAlgIds.size()];

            for (int i = 0; i != sigAlgIds.size(); i++)
            {
                sigs[i] = helper.createSignature(AlgorithmIdentifier.getInstance(sigAlgIds.getObjectAt(i)));

                if (random != null)
                {
                    sigs[i].initSign(privateKeys.get(i), random);
                }
                else
                {
                    sigs[i].initSign(privateKeys.get(i));
                }
            }

            OutputStream sStream = OutputStreamFactory.createStream(sigs[0]);
            for (int i = 1; i != sigs.length; i++)
            {
                sStream = new TeeOutputStream(sStream, OutputStreamFactory.createStream(sigs[i]));
            }

            final OutputStream sigStream = sStream;

            return new ContentSigner()
            {
                OutputStream stream = sigStream;

                public AlgorithmIdentifier getAlgorithmIdentifier()
                {
                    return sigAlgId;
                }

                public OutputStream getOutputStream()
                {
                    return stream;
                }

                public byte[] getSignature()
                {
                    try
                    {
                        ASN1EncodableVector sigV = new ASN1EncodableVector();

                        for (int i = 0; i != sigs.length; i++)
                        {
                            sigV.add(new DERBitString(sigs[i].sign()));
                        }

                        return new DERSequence(sigV).getEncoded(ASN1Encoding.DER);
                    }
                    catch (IOException e)
                    {
                        throw new RuntimeOperatorException("exception encoding signature: " + e.getMessage(), e);
                    }
                    catch (SignatureException e)
                    {
                        throw new RuntimeOperatorException("exception obtaining signature: " + e.getMessage(), e);
                    }
                }
            };
        }
        catch (GeneralSecurityException e)
        {
            throw new OperatorCreationException("cannot create signer: " + e.getMessage(), e);
        }
    }

    private static RSASSAPSSparams createPSSParams(PSSParameterSpec pssSpec)
    {
        DigestAlgorithmIdentifierFinder digFinder = new DefaultDigestAlgorithmIdentifierFinder();
        AlgorithmIdentifier digId = digFinder.find(pssSpec.getDigestAlgorithm());
        if (digId.getParameters() == null) {
            digId = new AlgorithmIdentifier(digId.getAlgorithm(), DERNull.INSTANCE);
        }
        AlgorithmIdentifier mgfDig = digFinder.find(((MGF1ParameterSpec)pssSpec.getMGFParameters()).getDigestAlgorithm());
        if (mgfDig.getParameters() == null) {
            mgfDig = new AlgorithmIdentifier(mgfDig.getAlgorithm(), DERNull.INSTANCE);
        }

        return new RSASSAPSSparams(
            digId,
            new AlgorithmIdentifier(PKCSObjectIdentifiers.id_mgf1, mgfDig),
            new ASN1Integer(pssSpec.getSaltLength()),
            new ASN1Integer(pssSpec.getTrailerField()));
    }

    private static ASN1Sequence createCompParams(CompositeAlgorithmSpec compSpec)
    {
        SignatureAlgorithmIdentifierFinder algFinder = new DefaultSignatureAlgorithmIdentifierFinder();
        ASN1EncodableVector v = new ASN1EncodableVector();

        List algorithmNames = compSpec.getAlgorithmNames();
        List algorithmSpecs = compSpec.getParameterSpecs();

        for (int i = 0; i != algorithmNames.size(); i++)
        {
            AlgorithmParameterSpec sigSpec = algorithmSpecs.get(i);
            if (sigSpec == null)
            {
                v.add(algFinder.find(algorithmNames.get(i)));
            }
            else if (sigSpec instanceof PSSParameterSpec)
            {
                v.add(createPSSParams((PSSParameterSpec)sigSpec));
            }
            else
            {
                throw new IllegalArgumentException("unrecognized parameterSpec");
            }
        }

        return new DERSequence(v);
    }
}