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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.bc;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
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;
import org.bouncycastle.crypto.ExtendedDigest;
import org.bouncycastle.crypto.digests.*;
import org.bouncycastle.operator.OperatorCreationException;

public class BcDefaultDigestProvider
    implements BcDigestProvider
{
    private static final Map lookup = createTable();

    private static Map createTable()
    {
        Map table = new HashMap();

        table.put(OIWObjectIdentifiers.idSHA1, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA1Digest();
            }
        });
        table.put(NISTObjectIdentifiers.id_sha224, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA224Digest();
            }
        });
        table.put(NISTObjectIdentifiers.id_sha256, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA256Digest();
            }
        });
        table.put(NISTObjectIdentifiers.id_sha384, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA384Digest();
            }
        });
        table.put(NISTObjectIdentifiers.id_sha512, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA512Digest();
            }
        });
        table.put(NISTObjectIdentifiers.id_sha3_224, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA3Digest(224);
            }
        });
        table.put(NISTObjectIdentifiers.id_sha3_256, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA3Digest(256);
            }
        });
        table.put(NISTObjectIdentifiers.id_sha3_384, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA3Digest(384);
            }
        });
        table.put(NISTObjectIdentifiers.id_sha3_512, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA3Digest(512);
            }
        });
        table.put(PKCSObjectIdentifiers.md5, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new MD5Digest();
            }
        });
        table.put(PKCSObjectIdentifiers.md4, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new MD4Digest();
            }
        });
        table.put(PKCSObjectIdentifiers.md2, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new MD2Digest();
            }
        });
        table.put(CryptoProObjectIdentifiers.gostR3411, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new GOST3411Digest();
            }
        });
        table.put(RosstandartObjectIdentifiers.id_tc26_gost_3411_12_256, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new GOST3411_2012_256Digest();
            }
        });
        table.put(RosstandartObjectIdentifiers.id_tc26_gost_3411_12_512, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new GOST3411_2012_512Digest();
            }
        });
        table.put(TeleTrusTObjectIdentifiers.ripemd128, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new RIPEMD128Digest();
            }
        });
        table.put(TeleTrusTObjectIdentifiers.ripemd160, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new RIPEMD160Digest();
            }
        });
        table.put(TeleTrusTObjectIdentifiers.ripemd256, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new RIPEMD256Digest();
            }
        });

        return Collections.unmodifiableMap(table);
    }

    public static final BcDigestProvider INSTANCE = new BcDefaultDigestProvider();

    private BcDefaultDigestProvider()
    {

    }

    public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
        throws OperatorCreationException
    {
        BcDigestProvider extProv = (BcDigestProvider)lookup.get(digestAlgorithmIdentifier.getAlgorithm());

        if (extProv == null)
        {
            throw new OperatorCreationException("cannot recognise digest");
        }

        return extProv.get(digestAlgorithmIdentifier);
    }
}