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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.tls.crypto.impl.jcajce;

import java.io.IOException;
import java.io.OutputStream;
import java.security.Signature;
import java.security.SignatureException;

import org.bouncycastle.tls.AlertDescription;
import org.bouncycastle.tls.TlsFatalAlert;
import org.bouncycastle.tls.crypto.TlsStreamSigner;
import org.bouncycastle.util.io.TeeOutputStream;

class JcaVerifyingStreamSigner
    implements TlsStreamSigner
{
    private final Signature signer;
    private final Signature verifier;
    private final OutputStream output;

    JcaVerifyingStreamSigner(Signature signer, Signature verifier)
    {
        OutputStream outputSigner = OutputStreamFactory.createStream(signer);
        OutputStream outputVerifier = OutputStreamFactory.createStream(verifier);

        this.signer = signer;
        this.verifier = verifier;
        this.output = new TeeOutputStream(outputSigner, outputVerifier);
    }

    public OutputStream getOutputStream() throws IOException
    {
        return output;
    }

    public byte[] getSignature() throws IOException
    {
        try
        {
            byte[] signature = signer.sign();
            if (verifier.verify(signature))
            {
                return signature;
            }
        }
        catch (SignatureException e)
        {
            throw new TlsFatalAlert(AlertDescription.internal_error, e);
        }

        throw new TlsFatalAlert(AlertDescription.internal_error);
    }
}