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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.PublicKey;
import java.security.Signature;

import org.bouncycastle.tls.DigitallySigned;
import org.bouncycastle.tls.SignatureAndHashAlgorithm;
import org.bouncycastle.tls.crypto.TlsStreamVerifier;
import org.bouncycastle.tls.crypto.TlsVerifier;

/**
 * JCA base class for the verifiers implementing the two DSA style algorithms from FIPS PUB 186-4: DSA and ECDSA.
 */
public abstract class JcaTlsDSSVerifier
    implements TlsVerifier
{
    protected final JcaTlsCrypto crypto;
    protected final PublicKey publicKey;
    protected final short algorithmType;
    protected final String algorithmName;

    protected JcaTlsDSSVerifier(JcaTlsCrypto crypto, PublicKey publicKey, short algorithmType, String algorithmName)
    {
        if (null == crypto)
        {
            throw new NullPointerException("crypto");
        }
        if (null == publicKey)
        {
            throw new NullPointerException("publicKey");
        }

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

    public TlsStreamVerifier getStreamVerifier(DigitallySigned digitallySigned) throws IOException
    {
        return null;
    }

    public boolean verifyRawSignature(DigitallySigned digitallySigned, byte[] hash)
    {
        SignatureAndHashAlgorithm algorithm = digitallySigned.getAlgorithm();
        if (algorithm != null && algorithm.getSignature() != algorithmType)
        {
            throw new IllegalStateException("Invalid algorithm: " + algorithm);
        }

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

            signer.initVerify(publicKey);
            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.verify(digitallySigned.getSignature());
        }
        catch (GeneralSecurityException e)
        {
            throw Exceptions.illegalStateException("unable to process signature: " + e.getMessage(), e);
        }
    }
}