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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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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.");
    }
}