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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. 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.

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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.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());
                AlgorithmIdentifier mgf1HashAlgorithm = new DefaultDigestAlgorithmIdentifierFinder().find((((MGF1ParameterSpec)oaepSpec.getMGFParameters()).getDigestAlgorithm()));
                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.");
    }
}