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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.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.Signature;

import org.bouncycastle.tls.AlertDescription;
import org.bouncycastle.tls.SignatureAndHashAlgorithm;
import org.bouncycastle.tls.TlsFatalAlert;
import org.bouncycastle.tls.crypto.TlsSigner;
import org.bouncycastle.tls.crypto.TlsStreamSigner;

/**
 * JCA base class for the signers implementing the two DSA style algorithms from FIPS PUB 186-4: DSA and ECDSA.
 */
public abstract class JcaTlsDSSSigner
    implements TlsSigner
{
    protected final JcaTlsCrypto crypto;
    protected final PrivateKey privateKey;
    protected final short algorithmType;
    protected final String algorithmName;

    protected JcaTlsDSSSigner(JcaTlsCrypto crypto, PrivateKey privateKey, short algorithmType, String algorithmName)
    {
        if (null == crypto)
        {
            throw new NullPointerException("crypto");
        }
        if (null == privateKey)
        {
            throw new NullPointerException("privateKey");
        }

        this.crypto = crypto;
        this.privateKey = privateKey;
        this.algorithmType = algorithmType;
        this.algorithmName = algorithmName;
    }

    public byte[] generateRawSignature(SignatureAndHashAlgorithm algorithm, byte[] hash)
        throws IOException
    {
        if (algorithm != null && algorithm.getSignature() != algorithmType)
        {
            throw new IllegalStateException();
        }

        try
        {
            Signature signer = crypto.getHelper().createSignature(algorithmName);

            signer.initSign(privateKey);
            if (algorithm == null)
            {
                // Note: Only use the SHA1 part of the (MD5/SHA1) hash
                signer.update(hash, 16, 20);
            }
            else
            {
                signer.update(hash, 0, hash.length);
            }
            return signer.sign();
        }
        catch (GeneralSecurityException e)
        {
            throw new TlsFatalAlert(AlertDescription.internal_error, e);
        }
    }

    public TlsStreamSigner getStreamSigner(SignatureAndHashAlgorithm algorithm)
    {
        return null;
    }
}