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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 1.4. 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.cms;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.rosstandart.RosstandartObjectIdentifiers;
import org.bouncycastle.asn1.teletrust.TeleTrusTObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

public class DefaultCMSSignatureEncryptionAlgorithmFinder
    implements CMSSignatureEncryptionAlgorithmFinder
{
    protected static final Set RSA_PKCS1d5 = new HashSet();
    protected static final Map GOST_ENC = new HashMap();

    static
    {
        RSA_PKCS1d5.add(PKCSObjectIdentifiers.md2WithRSAEncryption);
        RSA_PKCS1d5.add(PKCSObjectIdentifiers.md4WithRSAEncryption);
        RSA_PKCS1d5.add(PKCSObjectIdentifiers.md5WithRSAEncryption);
        RSA_PKCS1d5.add(PKCSObjectIdentifiers.sha1WithRSAEncryption);
        RSA_PKCS1d5.add(OIWObjectIdentifiers.md4WithRSAEncryption);
        RSA_PKCS1d5.add(OIWObjectIdentifiers.md4WithRSA);
        RSA_PKCS1d5.add(OIWObjectIdentifiers.md5WithRSA);
        RSA_PKCS1d5.add(OIWObjectIdentifiers.sha1WithRSA);
        RSA_PKCS1d5.add(TeleTrusTObjectIdentifiers.rsaSignatureWithripemd128);
        RSA_PKCS1d5.add(TeleTrusTObjectIdentifiers.rsaSignatureWithripemd160);
        RSA_PKCS1d5.add(TeleTrusTObjectIdentifiers.rsaSignatureWithripemd256);

        GOST_ENC.put(CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_2001,
            new AlgorithmIdentifier(CryptoProObjectIdentifiers.gostR3410_2001, DERNull.INSTANCE));
        GOST_ENC.put(RosstandartObjectIdentifiers.id_tc26_signwithdigest_gost_3410_12_256,
            new AlgorithmIdentifier(RosstandartObjectIdentifiers.id_tc26_gost_3410_12_256, DERNull.INSTANCE));
        GOST_ENC.put(RosstandartObjectIdentifiers.id_tc26_signwithdigest_gost_3410_12_512,
            new AlgorithmIdentifier(RosstandartObjectIdentifiers.id_tc26_gost_3410_12_512, DERNull.INSTANCE));
    }

    public AlgorithmIdentifier findEncryptionAlgorithm(AlgorithmIdentifier signatureAlgorithm)
    {
               // RFC3370 section 3.2 with RFC 5754 update
        if (RSA_PKCS1d5.contains(signatureAlgorithm.getAlgorithm()))
        {
            return new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, DERNull.INSTANCE);
        }
        // GOST signature encryption algorithms
        if (GOST_ENC.containsKey(signatureAlgorithm.getAlgorithm()))
        {
            return (AlgorithmIdentifier)GOST_ENC.get(signatureAlgorithm.getAlgorithm());
        }
        return signatureAlgorithm;
    }
}