All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.bouncycastle.openpgp.operator.bc.BcPGPContentSignerBuilder Maven / Gradle / Ivy

Go to download

The Bouncy Castle Java API for handling the OpenPGP protocol. This jar contains the OpenPGP API 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.

There is a newer version: 1.79
Show newest version
package org.bouncycastle.openpgp.operator.bc;

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

import org.bouncycastle.crypto.CryptoException;
import org.bouncycastle.crypto.Signer;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPPrivateKey;
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 BcPGPContentSignerBuilder
    implements PGPContentSignerBuilder
{
    private BcPGPDigestCalculatorProvider digestCalculatorProvider = new BcPGPDigestCalculatorProvider();
    private BcPGPKeyConverter           keyConverter = new BcPGPKeyConverter();
    private int                         hashAlgorithm;
    private SecureRandom                random;
    private int keyAlgorithm;

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

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

        return this;
    }

    public PGPContentSigner build(final int signatureType, final PGPPrivateKey privateKey)
        throws PGPException
    {
        final PGPDigestCalculator digestCalculator = digestCalculatorProvider.get(hashAlgorithm);
        final Signer signer = BcImplProvider.createSigner(keyAlgorithm, hashAlgorithm);

        if (random != null)
        {
            signer.init(true, new ParametersWithRandom(keyConverter.getPrivateKey(privateKey), random));
        }
        else
        {
            signer.init(true, keyConverter.getPrivateKey(privateKey));
        }

        return new PGPContentSigner()
        {
            public int getType()
            {
                return signatureType;
            }

            public int getHashAlgorithm()
            {
                return hashAlgorithm;
            }

            public int getKeyAlgorithm()
            {
                return keyAlgorithm;
            }

            public long getKeyID()
            {
                return privateKey.getKeyID();
            }

            public OutputStream getOutputStream()
            {
                return new TeeOutputStream(new SignerOutputStream(signer), digestCalculator.getOutputStream());
            }

            public byte[] getSignature()
            {
                try
                {
                    return signer.generateSignature();
                }
                catch (CryptoException e)
                {    // TODO: need a specific runtime exception for PGP operators.
                    throw new IllegalStateException("unable to create signature");
                }
            }

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




© 2015 - 2024 Weber Informatics LLC | Privacy Policy