org.bouncycastle.openpgp.operator.jcajce.JcaPGPContentSignerBuilder Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.
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package org.bouncycastle.openpgp.operator.jcajce;

import java.io.OutputStream;
import java.security.InvalidKeyException;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.SignatureException;

import org.bouncycastle.bcpg.PublicKeyAlgorithmTags;
import org.bouncycastle.jcajce.io.OutputStreamFactory;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPPrivateKey;
import org.bouncycastle.openpgp.PGPRuntimeOperationException;
import org.bouncycastle.openpgp.operator.PGPContentSigner;
import org.bouncycastle.openpgp.operator.PGPContentSignerBuilder;
import org.bouncycastle.openpgp.operator.PGPDigestCalculator;
import org.bouncycastle.util.io.TeeOutputStream;

public class JcaPGPContentSignerBuilder
    implements PGPContentSignerBuilder
{
    private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
    private JcaPGPDigestCalculatorProviderBuilder digestCalculatorProviderBuilder = new JcaPGPDigestCalculatorProviderBuilder();
    private JcaPGPKeyConverter keyConverter = new JcaPGPKeyConverter();
    private int hashAlgorithm;
    private SecureRandom random;
    private int keyAlgorithm;

    public JcaPGPContentSignerBuilder(int keyAlgorithm, int hashAlgorithm)
    {
        this.keyAlgorithm = keyAlgorithm;
        this.hashAlgorithm = hashAlgorithm;
    }

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

        return this;
    }

    public JcaPGPContentSignerBuilder setProvider(Provider provider)
    {
        this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));
        keyConverter.setProvider(provider);
        digestCalculatorProviderBuilder.setProvider(provider);

        return this;
    }

    public JcaPGPContentSignerBuilder setProvider(String providerName)
    {
        this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));
        keyConverter.setProvider(providerName);
        digestCalculatorProviderBuilder.setProvider(providerName);

        return this;
    }

    public JcaPGPContentSignerBuilder setDigestProvider(Provider provider)
    {
        digestCalculatorProviderBuilder.setProvider(provider);

        return this;
    }

    public JcaPGPContentSignerBuilder setDigestProvider(String providerName)
    {
        digestCalculatorProviderBuilder.setProvider(providerName);

        return this;
    }

    public PGPContentSigner build(final int signatureType, PGPPrivateKey privateKey)
        throws PGPException
    {
        if (privateKey instanceof JcaPGPPrivateKey)
        {
            return build(signatureType, privateKey.getKeyID(), ((JcaPGPPrivateKey)privateKey).getPrivateKey());
        }
        else
        {
            return build(signatureType, privateKey.getKeyID(), keyConverter.getPrivateKey(privateKey));
        }
    }

    public PGPContentSigner build(final int signatureType, final long keyID, final PrivateKey privateKey)
        throws PGPException
    {
        final PGPDigestCalculator digestCalculator = digestCalculatorProviderBuilder.build().get(hashAlgorithm);
        final PGPDigestCalculator edDigestCalculator = digestCalculatorProviderBuilder.build().get(hashAlgorithm);
        final Signature signature;

        if (keyAlgorithm == PublicKeyAlgorithmTags.EDDSA_LEGACY && privateKey.getAlgorithm().equals("Ed448"))
        {
            signature = helper.createSignature("Ed448");
        }
        else
        {
            signature = helper.createSignature(keyAlgorithm, hashAlgorithm);
        }


        try
        {
            if (random != null)
            {
                signature.initSign(privateKey, random);
            }
            else
            {
                signature.initSign(privateKey);
            }
        }
        catch (InvalidKeyException e)
        {
            throw new PGPException("invalid key.", e);
        }

        return new PGPContentSigner()
        {
            private final boolean isEdDsa = keyAlgorithm == PublicKeyAlgorithmTags.EDDSA_LEGACY || keyAlgorithm == PublicKeyAlgorithmTags.Ed448 || keyAlgorithm == PublicKeyAlgorithmTags.Ed25519;

            public int getType()
            {
                return signatureType;
            }

            public int getHashAlgorithm()
            {
                return hashAlgorithm;
            }

            public int getKeyAlgorithm()
            {
                return keyAlgorithm;
            }

            public long getKeyID()
            {
                return keyID;
            }

            public OutputStream getOutputStream()
            {
                if (isEdDsa)
                {
                    return new TeeOutputStream(edDigestCalculator.getOutputStream(), digestCalculator.getOutputStream());
                }
                return new TeeOutputStream(OutputStreamFactory.createStream(signature), digestCalculator.getOutputStream());
            }

            public byte[] getSignature()
            {
                try
                {
                    if (isEdDsa)
                    {
                        signature.update(edDigestCalculator.getDigest());
                    }
                    return signature.sign();
                }
                catch (SignatureException e)
                {
                    throw new PGPRuntimeOperationException("Unable to create signature: " + e.getMessage(), e);
                }
            }

            public byte[] getDigest()
            {
                return digestCalculator.getDigest();
            }
        };
    }
}