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

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcpg-jdk15on Show documentation

The Bouncy Castle Java API for handling the OpenPGP protocol. This jar contains the OpenPGP API for JDK 1.5 to JDK 1.7. 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: 1.70

Show newest version

package org.bouncycastle.openpgp.operator.bc;

import java.io.OutputStream;

import org.bouncycastle.crypto.Signer;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPPublicKey;
import org.bouncycastle.openpgp.operator.PGPContentVerifier;
import org.bouncycastle.openpgp.operator.PGPContentVerifierBuilder;
import org.bouncycastle.openpgp.operator.PGPContentVerifierBuilderProvider;

public class BcPGPContentVerifierBuilderProvider
    implements PGPContentVerifierBuilderProvider
{
    private BcPGPKeyConverter keyConverter = new BcPGPKeyConverter();

    public BcPGPContentVerifierBuilderProvider()
    {
    }

    public PGPContentVerifierBuilder get(int keyAlgorithm, int hashAlgorithm)
        throws PGPException
    {
        return new BcPGPContentVerifierBuilder(keyAlgorithm, hashAlgorithm);
    }

    private class BcPGPContentVerifierBuilder
        implements PGPContentVerifierBuilder
    {
        private int hashAlgorithm;
        private int keyAlgorithm;

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

        public PGPContentVerifier build(final PGPPublicKey publicKey)
            throws PGPException
        {
            final Signer signer = BcImplProvider.createSigner(keyAlgorithm, hashAlgorithm);

            signer.init(false, keyConverter.getPublicKey(publicKey));

            return new PGPContentVerifier()
            {
                public int getHashAlgorithm()
                {
                    return hashAlgorithm;
                }

                public int getKeyAlgorithm()
                {
                    return keyAlgorithm;
                }

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

                public boolean verify(byte[] expected)
                {
                    return signer.verifySignature(expected);
                }

                public OutputStream getOutputStream()
                {
                    return new SignerOutputStream(signer);
                }
            };
        }
    }
}