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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.bc;

import java.io.OutputStream;

import org.bouncycastle.crypto.Signer;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
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
        {
            AsymmetricKeyParameter pubParam = keyConverter.getPublicKey(publicKey);
            final Signer signer = BcImplProvider.createSigner(keyAlgorithm, hashAlgorithm, pubParam);

            signer.init(false, pubParam);

            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);
                }
            };
        }
    }
}