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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs 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.

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package org.bouncycastle.operator.jcajce;

import java.io.IOException;
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 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.DefaultSignatureAlgorithmIdentifierFinder;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.OperatorStreamException;
import org.bouncycastle.operator.RuntimeOperatorException;

public class JcaContentSignerBuilder
{
    private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
    private SecureRandom random;
    private String signatureAlgorithm;
    private AlgorithmIdentifier sigAlgId;

    public JcaContentSignerBuilder(String signatureAlgorithm)
    {
        this.signatureAlgorithm = signatureAlgorithm;
        this.sigAlgId = new DefaultSignatureAlgorithmIdentifierFinder().find(signatureAlgorithm);
    }

    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 SignatureOutputStream stream = new SignatureOutputStream(sig);

                public AlgorithmIdentifier getAlgorithmIdentifier()
                {
                    return signatureAlgId;
                }

                public OutputStream getOutputStream()
                {
                    return stream;
                }

                public byte[] getSignature()
                {
                    try
                    {
                        return stream.getSignature();
                    }
                    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 class SignatureOutputStream
        extends OutputStream
    {
        private Signature sig;

        SignatureOutputStream(Signature sig)
        {
            this.sig = sig;
        }

        public void write(byte[] bytes, int off, int len)
            throws IOException
        {
            try
            {
                sig.update(bytes, off, len);
            }
            catch (SignatureException e)
            {
                throw new OperatorStreamException("exception in content signer: " + e.getMessage(), e);
            }
        }

        public void write(byte[] bytes)
            throws IOException
        {
            try
            {
                sig.update(bytes);
            }
            catch (SignatureException e)
            {
                throw new OperatorStreamException("exception in content signer: " + e.getMessage(), e);
            }
        }

        public void write(int b)
            throws IOException
        {
            try
            {
                sig.update((byte)b);
            }
            catch (SignatureException e)
            {
                throw new OperatorStreamException("exception in content signer: " + e.getMessage(), e);
            }
        }

        byte[] getSignature()
            throws SignatureException
        {
            return sig.sign();
        }
    }
}