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. 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.operator.jcajce;

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 org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.RSASSAPSSparams;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
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;

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
        {
            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
    {
        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 static RSASSAPSSparams createPSSParams(PSSParameterSpec pssSpec)
    {
        DigestAlgorithmIdentifierFinder digFinder = new DefaultDigestAlgorithmIdentifierFinder();
           AlgorithmIdentifier digId = digFinder.find(pssSpec.getDigestAlgorithm());
           AlgorithmIdentifier mgfDig = digFinder.find(((MGF1ParameterSpec)pssSpec.getMGFParameters()).getDigestAlgorithm());

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