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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 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.operator.jcajce;


import java.io.IOException;
import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.MGF1ParameterSpec;

import javax.crypto.spec.OAEPParameterSpec;
import javax.crypto.spec.PSource;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.RSAESOAEPparams;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.operator.DefaultDigestAlgorithmIdentifierFinder;

public class JcaAlgorithmParametersConverter
{
    public JcaAlgorithmParametersConverter()
    {
    }

    public AlgorithmIdentifier getAlgorithmIdentifier(ASN1ObjectIdentifier algId, AlgorithmParameters parameters)
        throws InvalidAlgorithmParameterException
    {
        try
        {
            ASN1Encodable params = ASN1Primitive.fromByteArray(parameters.getEncoded());

            return new AlgorithmIdentifier(algId, params);
        }
        catch (IOException e)
        {
            throw new InvalidAlgorithmParameterException("unable to encode parameters object: " + e.getMessage());
        }
    }

    public AlgorithmIdentifier getAlgorithmIdentifier(ASN1ObjectIdentifier algorithm, AlgorithmParameterSpec algorithmSpec)
        throws InvalidAlgorithmParameterException
    {
        if (algorithmSpec instanceof OAEPParameterSpec)
        {
            if (algorithmSpec.equals(OAEPParameterSpec.DEFAULT))
            {
                return new AlgorithmIdentifier(algorithm,
                    new RSAESOAEPparams(RSAESOAEPparams.DEFAULT_HASH_ALGORITHM, RSAESOAEPparams.DEFAULT_MASK_GEN_FUNCTION, RSAESOAEPparams.DEFAULT_P_SOURCE_ALGORITHM));
            }
            else
            {
                OAEPParameterSpec oaepSpec = (OAEPParameterSpec)algorithmSpec;
                PSource pSource = oaepSpec.getPSource();

                if (!oaepSpec.getMGFAlgorithm().equals(OAEPParameterSpec.DEFAULT.getMGFAlgorithm()))
                {
                    throw new InvalidAlgorithmParameterException("only " + OAEPParameterSpec.DEFAULT.getMGFAlgorithm() + " mask generator supported.");
                }

                AlgorithmIdentifier hashAlgorithm = new DefaultDigestAlgorithmIdentifierFinder().find(oaepSpec.getDigestAlgorithm());
                if (hashAlgorithm.getParameters() == null)
                {
                    hashAlgorithm = new AlgorithmIdentifier(hashAlgorithm.getAlgorithm(), DERNull.INSTANCE);
                }
                AlgorithmIdentifier mgf1HashAlgorithm = new DefaultDigestAlgorithmIdentifierFinder().find((((MGF1ParameterSpec)oaepSpec.getMGFParameters()).getDigestAlgorithm()));
                if (mgf1HashAlgorithm.getParameters() == null)
                {
                    mgf1HashAlgorithm = new AlgorithmIdentifier(mgf1HashAlgorithm.getAlgorithm(), DERNull.INSTANCE);
                }
                return new AlgorithmIdentifier(algorithm,
                    new RSAESOAEPparams(hashAlgorithm, new AlgorithmIdentifier(PKCSObjectIdentifiers.id_mgf1, mgf1HashAlgorithm),
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.id_pSpecified, new DEROctetString(((PSource.PSpecified)pSource).getValue()))));
            }
        }

        throw new InvalidAlgorithmParameterException("unknown parameter spec passed.");
    }
}