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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;

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

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DERNull;
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.pkcs.RSASSAPSSparams;
import org.bouncycastle.asn1.teletrust.TeleTrusTObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;

public class DefaultDigestAlgorithmIdentifierFinder
    implements DigestAlgorithmIdentifierFinder
{
    private static Map digestOids = new HashMap();
    private static Map digestNameToOids = new HashMap();

    static
    {
        //
        // digests
        //
        digestOids.put(OIWObjectIdentifiers.md4WithRSAEncryption, PKCSObjectIdentifiers.md4);
        digestOids.put(OIWObjectIdentifiers.md4WithRSA, PKCSObjectIdentifiers.md4);
        digestOids.put(OIWObjectIdentifiers.sha1WithRSA, OIWObjectIdentifiers.idSHA1);

        digestOids.put(PKCSObjectIdentifiers.sha224WithRSAEncryption, NISTObjectIdentifiers.id_sha224);
        digestOids.put(PKCSObjectIdentifiers.sha256WithRSAEncryption, NISTObjectIdentifiers.id_sha256);
        digestOids.put(PKCSObjectIdentifiers.sha384WithRSAEncryption, NISTObjectIdentifiers.id_sha384);
        digestOids.put(PKCSObjectIdentifiers.sha512WithRSAEncryption, NISTObjectIdentifiers.id_sha512);
        digestOids.put(PKCSObjectIdentifiers.md2WithRSAEncryption, PKCSObjectIdentifiers.md2);
        digestOids.put(PKCSObjectIdentifiers.md4WithRSAEncryption, PKCSObjectIdentifiers.md4);
        digestOids.put(PKCSObjectIdentifiers.md5WithRSAEncryption, PKCSObjectIdentifiers.md5);
        digestOids.put(PKCSObjectIdentifiers.sha1WithRSAEncryption, OIWObjectIdentifiers.idSHA1);

        digestOids.put(X9ObjectIdentifiers.ecdsa_with_SHA1, OIWObjectIdentifiers.idSHA1);
        digestOids.put(X9ObjectIdentifiers.ecdsa_with_SHA224, NISTObjectIdentifiers.id_sha224);
        digestOids.put(X9ObjectIdentifiers.ecdsa_with_SHA256, NISTObjectIdentifiers.id_sha256);
        digestOids.put(X9ObjectIdentifiers.ecdsa_with_SHA384, NISTObjectIdentifiers.id_sha384);
        digestOids.put(X9ObjectIdentifiers.ecdsa_with_SHA512, NISTObjectIdentifiers.id_sha512);
        digestOids.put(X9ObjectIdentifiers.id_dsa_with_sha1, OIWObjectIdentifiers.idSHA1);

        digestOids.put(NISTObjectIdentifiers.dsa_with_sha224, NISTObjectIdentifiers.id_sha224);
        digestOids.put(NISTObjectIdentifiers.dsa_with_sha256, NISTObjectIdentifiers.id_sha256);
        digestOids.put(NISTObjectIdentifiers.dsa_with_sha384, NISTObjectIdentifiers.id_sha384);
        digestOids.put(NISTObjectIdentifiers.dsa_with_sha512, NISTObjectIdentifiers.id_sha512);

        digestOids.put(TeleTrusTObjectIdentifiers.rsaSignatureWithripemd128, TeleTrusTObjectIdentifiers.ripemd128);
        digestOids.put(TeleTrusTObjectIdentifiers.rsaSignatureWithripemd160, TeleTrusTObjectIdentifiers.ripemd160);
        digestOids.put(TeleTrusTObjectIdentifiers.rsaSignatureWithripemd256, TeleTrusTObjectIdentifiers.ripemd256);

        digestOids.put(CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_94, CryptoProObjectIdentifiers.gostR3411);
        digestOids.put(CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_2001, CryptoProObjectIdentifiers.gostR3411);

        digestNameToOids.put("SHA-1", OIWObjectIdentifiers.idSHA1);
        digestNameToOids.put("SHA-224", NISTObjectIdentifiers.id_sha224);
        digestNameToOids.put("SHA-256", NISTObjectIdentifiers.id_sha256);
        digestNameToOids.put("SHA-384", NISTObjectIdentifiers.id_sha384);
        digestNameToOids.put("SHA-512", NISTObjectIdentifiers.id_sha512);

        digestNameToOids.put("GOST3411", CryptoProObjectIdentifiers.gostR3411);

        digestNameToOids.put("MD2", PKCSObjectIdentifiers.md2);
        digestNameToOids.put("MD4", PKCSObjectIdentifiers.md4);
        digestNameToOids.put("MD5", PKCSObjectIdentifiers.md5);

        digestNameToOids.put("RIPEMD128", TeleTrusTObjectIdentifiers.ripemd128);
        digestNameToOids.put("RIPEMD160", TeleTrusTObjectIdentifiers.ripemd160);
        digestNameToOids.put("RIPEMD256", TeleTrusTObjectIdentifiers.ripemd256);
    }

    public AlgorithmIdentifier find(AlgorithmIdentifier sigAlgId)
    {
        AlgorithmIdentifier digAlgId;

        if (sigAlgId.getAlgorithm().equals(PKCSObjectIdentifiers.id_RSASSA_PSS))
        {
            digAlgId = RSASSAPSSparams.getInstance(sigAlgId.getParameters()).getHashAlgorithm();
        }
        else
        {
            digAlgId = new AlgorithmIdentifier((ASN1ObjectIdentifier)digestOids.get(sigAlgId.getAlgorithm()), DERNull.INSTANCE);
        }

        return digAlgId;
    }

    public AlgorithmIdentifier find(String digAlgName)
    {
        return new AlgorithmIdentifier((ASN1ObjectIdentifier)digestNameToOids.get(digAlgName), DERNull.INSTANCE);
    }
}