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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 1.8 and up. 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.operator.bc;

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

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.CryptoException;
import org.bouncycastle.crypto.Signer;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.RuntimeOperatorException;

public abstract class BcContentSignerBuilder
{
    private SecureRandom random;
    private AlgorithmIdentifier sigAlgId;
    private AlgorithmIdentifier digAlgId;

    protected BcDigestProvider                digestProvider;

    public BcContentSignerBuilder(AlgorithmIdentifier sigAlgId, AlgorithmIdentifier digAlgId)
    {
        this.sigAlgId = sigAlgId;
        this.digAlgId = digAlgId;
        this.digestProvider = BcDefaultDigestProvider.INSTANCE;
    }

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

        return this;
    }

    public ContentSigner build(AsymmetricKeyParameter privateKey)
        throws OperatorCreationException
    {
        final Signer sig = createSigner(sigAlgId, digAlgId);

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

        return new ContentSigner()
        {
            private BcSignerOutputStream stream = new BcSignerOutputStream(sig);

            public AlgorithmIdentifier getAlgorithmIdentifier()
            {
                return sigAlgId;
            }

            public OutputStream getOutputStream()
            {
                return stream;
            }

            public byte[] getSignature()
            {
                try
                {
                    return stream.getSignature();
                }
                catch (CryptoException e)
                {
                    throw new RuntimeOperatorException("exception obtaining signature: " + e.getMessage(), e);
                }
            }
        };
    }

    protected abstract Signer createSigner(AlgorithmIdentifier sigAlgId, AlgorithmIdentifier algorithmIdentifier)
        throws OperatorCreationException;
}