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The Bouncy Castle Java APIs for TLS and DTLS, including a provider for the JSSE.

There is a newer version: 1.79

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

import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.MGF1ParameterSpec;
import java.security.spec.PSSParameterSpec;

import org.bouncycastle.jcajce.util.JcaJceHelper;
import org.bouncycastle.tls.HashAlgorithm;

class RSAUtil
{
    static String getDigestSigAlgName(
        String name)
    {
        int dIndex = name.indexOf('-');
        if (dIndex > 0 && !name.startsWith("SHA3"))
        {
            return name.substring(0, dIndex) + name.substring(dIndex + 1);
        }

        return name;
    }


    static AlgorithmParameterSpec getPSSParameterSpec(short hash, String digestName, JcaJceHelper helper)
//        throws NoSuchProviderException, NoSuchAlgorithmException
    {
// Used where providers can't handle PSSParameterSpec properly.
//        AlgorithmIdentifier hashAlg = getHashAlgorithmID(hash);
//
//        RSASSAPSSparams pssParams = new RSASSAPSSparams(
//            hashAlg,
//            new AlgorithmIdentifier(PKCSObjectIdentifiers.id_mgf1, hashAlg),
//            new ASN1Integer(HashAlgorithm.getOutputSize(hash)),
//            RSASSAPSSparams.DEFAULT_TRAILER_FIELD);
//
//        AlgorithmParameters params = helper.createAlgorithmParameters("PSS");
//
//        try
//        {
//            params.init(pssParams.getEncoded(), "ASN.1");
//
//            return params.getParameterSpec(AlgorithmParameterSpec.class);
//        }
//        catch (IOException e)
//        {   // this should never happen!
//            throw new NoSuchAlgorithmException("cannot encode RSASSAPSSparams: " + e.getMessage());
//        }
//        catch (InvalidParameterSpecException e)
//        {
//            throw new NoSuchAlgorithmException("cannot recover PSS paramSpec: " + e.getMessage());
//        }

        MGF1ParameterSpec mgf1Spec = new MGF1ParameterSpec(digestName);
        return new PSSParameterSpec(digestName, "MGF1", mgf1Spec, HashAlgorithm.getOutputSize(hash), 1);
    }

//    private static AlgorithmIdentifier getHashAlgorithmID(short hashAlgorithm)
//    {
//        switch (hashAlgorithm)
//        {
//        case HashAlgorithm.sha256:
//            return new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha256, DERNull.INSTANCE);
//        case HashAlgorithm.sha384:
//            return new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha384, DERNull.INSTANCE);
//        case HashAlgorithm.sha512:
//            return new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha512, DERNull.INSTANCE);
//        default:
//            return null;
//        }
//    }
}