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

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.bc.BCObjectIdentifiers;
import org.bouncycastle.asn1.bsi.BSIObjectIdentifiers;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.eac.EACObjectIdentifiers;
import org.bouncycastle.asn1.gm.GMObjectIdentifiers;
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;
import org.bouncycastle.util.Strings;

public class DefaultSignatureAlgorithmIdentifierFinder
    implements SignatureAlgorithmIdentifierFinder
{
    private static Map algorithms = new HashMap();
    private static Set noParams = new HashSet();
    private static Map params = new HashMap();
    private static Set pkcs15RsaEncryption = new HashSet();
    private static Map digestOids = new HashMap();

    private static final ASN1ObjectIdentifier ENCRYPTION_RSA = PKCSObjectIdentifiers.rsaEncryption;
    private static final ASN1ObjectIdentifier ENCRYPTION_DSA = X9ObjectIdentifiers.id_dsa_with_sha1;
    private static final ASN1ObjectIdentifier ENCRYPTION_ECDSA = X9ObjectIdentifiers.ecdsa_with_SHA1;
    private static final ASN1ObjectIdentifier ENCRYPTION_RSA_PSS = PKCSObjectIdentifiers.id_RSASSA_PSS;
    private static final ASN1ObjectIdentifier ENCRYPTION_GOST3410 = CryptoProObjectIdentifiers.gostR3410_94;
    private static final ASN1ObjectIdentifier ENCRYPTION_ECGOST3410 = CryptoProObjectIdentifiers.gostR3410_2001;

    static
    {
        algorithms.put("MD2WITHRSAENCRYPTION", PKCSObjectIdentifiers.md2WithRSAEncryption);
        algorithms.put("MD2WITHRSA", PKCSObjectIdentifiers.md2WithRSAEncryption);
        algorithms.put("MD5WITHRSAENCRYPTION", PKCSObjectIdentifiers.md5WithRSAEncryption);
        algorithms.put("MD5WITHRSA", PKCSObjectIdentifiers.md5WithRSAEncryption);
        algorithms.put("SHA1WITHRSAENCRYPTION", PKCSObjectIdentifiers.sha1WithRSAEncryption);
        algorithms.put("SHA1WITHRSA", PKCSObjectIdentifiers.sha1WithRSAEncryption);
        algorithms.put("SHA224WITHRSAENCRYPTION", PKCSObjectIdentifiers.sha224WithRSAEncryption);
        algorithms.put("SHA224WITHRSA", PKCSObjectIdentifiers.sha224WithRSAEncryption);
        algorithms.put("SHA256WITHRSAENCRYPTION", PKCSObjectIdentifiers.sha256WithRSAEncryption);
        algorithms.put("SHA256WITHRSA", PKCSObjectIdentifiers.sha256WithRSAEncryption);
        algorithms.put("SHA384WITHRSAENCRYPTION", PKCSObjectIdentifiers.sha384WithRSAEncryption);
        algorithms.put("SHA384WITHRSA", PKCSObjectIdentifiers.sha384WithRSAEncryption);
        algorithms.put("SHA512WITHRSAENCRYPTION", PKCSObjectIdentifiers.sha512WithRSAEncryption);
        algorithms.put("SHA512WITHRSA", PKCSObjectIdentifiers.sha512WithRSAEncryption);
        algorithms.put("SHA1WITHRSAANDMGF1", PKCSObjectIdentifiers.id_RSASSA_PSS);
        algorithms.put("SHA224WITHRSAANDMGF1", PKCSObjectIdentifiers.id_RSASSA_PSS);
        algorithms.put("SHA256WITHRSAANDMGF1", PKCSObjectIdentifiers.id_RSASSA_PSS);
        algorithms.put("SHA384WITHRSAANDMGF1", PKCSObjectIdentifiers.id_RSASSA_PSS);
        algorithms.put("SHA512WITHRSAANDMGF1", PKCSObjectIdentifiers.id_RSASSA_PSS);
        algorithms.put("RIPEMD160WITHRSAENCRYPTION", TeleTrusTObjectIdentifiers.rsaSignatureWithripemd160);
        algorithms.put("RIPEMD160WITHRSA", TeleTrusTObjectIdentifiers.rsaSignatureWithripemd160);
        algorithms.put("RIPEMD128WITHRSAENCRYPTION", TeleTrusTObjectIdentifiers.rsaSignatureWithripemd128);
        algorithms.put("RIPEMD128WITHRSA", TeleTrusTObjectIdentifiers.rsaSignatureWithripemd128);
        algorithms.put("RIPEMD256WITHRSAENCRYPTION", TeleTrusTObjectIdentifiers.rsaSignatureWithripemd256);
        algorithms.put("RIPEMD256WITHRSA", TeleTrusTObjectIdentifiers.rsaSignatureWithripemd256);
        algorithms.put("SHA1WITHDSA", X9ObjectIdentifiers.id_dsa_with_sha1);
        algorithms.put("DSAWITHSHA1", X9ObjectIdentifiers.id_dsa_with_sha1);
        algorithms.put("SHA224WITHDSA", NISTObjectIdentifiers.dsa_with_sha224);
        algorithms.put("SHA256WITHDSA", NISTObjectIdentifiers.dsa_with_sha256);
        algorithms.put("SHA384WITHDSA", NISTObjectIdentifiers.dsa_with_sha384);
        algorithms.put("SHA512WITHDSA", NISTObjectIdentifiers.dsa_with_sha512);
        algorithms.put("SHA1WITHECDSA", X9ObjectIdentifiers.ecdsa_with_SHA1);
        algorithms.put("ECDSAWITHSHA1", X9ObjectIdentifiers.ecdsa_with_SHA1);
        algorithms.put("SHA224WITHECDSA", X9ObjectIdentifiers.ecdsa_with_SHA224);
        algorithms.put("SHA256WITHECDSA", X9ObjectIdentifiers.ecdsa_with_SHA256);
        algorithms.put("SHA384WITHECDSA", X9ObjectIdentifiers.ecdsa_with_SHA384);
        algorithms.put("SHA512WITHECDSA", X9ObjectIdentifiers.ecdsa_with_SHA512);
        algorithms.put("GOST3411WITHGOST3410", CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_94);
        algorithms.put("GOST3411WITHGOST3410-94", CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_94);
        algorithms.put("GOST3411WITHECGOST3410", CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_2001);
        algorithms.put("GOST3411WITHECGOST3410-2001", CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_2001);
        algorithms.put("GOST3411WITHGOST3410-2001", CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_2001);
        algorithms.put("SHA1WITHPLAIN-ECDSA", BSIObjectIdentifiers.ecdsa_plain_SHA1);
        algorithms.put("SHA224WITHPLAIN-ECDSA", BSIObjectIdentifiers.ecdsa_plain_SHA224);
        algorithms.put("SHA256WITHPLAIN-ECDSA", BSIObjectIdentifiers.ecdsa_plain_SHA256);
        algorithms.put("SHA384WITHPLAIN-ECDSA", BSIObjectIdentifiers.ecdsa_plain_SHA384);
        algorithms.put("SHA512WITHPLAIN-ECDSA", BSIObjectIdentifiers.ecdsa_plain_SHA512);
        algorithms.put("RIPEMD160WITHPLAIN-ECDSA", BSIObjectIdentifiers.ecdsa_plain_RIPEMD160);
        algorithms.put("SHA1WITHCVC-ECDSA", EACObjectIdentifiers.id_TA_ECDSA_SHA_1);
        algorithms.put("SHA224WITHCVC-ECDSA", EACObjectIdentifiers.id_TA_ECDSA_SHA_224);
        algorithms.put("SHA256WITHCVC-ECDSA", EACObjectIdentifiers.id_TA_ECDSA_SHA_256);
        algorithms.put("SHA384WITHCVC-ECDSA", EACObjectIdentifiers.id_TA_ECDSA_SHA_384);
        algorithms.put("SHA512WITHCVC-ECDSA", EACObjectIdentifiers.id_TA_ECDSA_SHA_512);
        algorithms.put("SHA3-512WITHSPHINCS256", BCObjectIdentifiers.sphincs256_with_SHA3_512);
        algorithms.put("SHA512WITHSPHINCS256", BCObjectIdentifiers.sphincs256_with_SHA512);
        algorithms.put("SM3WITHSM2", GMObjectIdentifiers.sm2sign_with_sm3);
        //
        // According to RFC 3279, the ASN.1 encoding SHALL (id-dsa-with-sha1) or MUST (ecdsa-with-SHA*) omit the parameters field.
        // The parameters field SHALL be NULL for RSA based signature algorithms.
        //
        noParams.add(X9ObjectIdentifiers.ecdsa_with_SHA1);
        noParams.add(X9ObjectIdentifiers.ecdsa_with_SHA224);
        noParams.add(X9ObjectIdentifiers.ecdsa_with_SHA256);
        noParams.add(X9ObjectIdentifiers.ecdsa_with_SHA384);
        noParams.add(X9ObjectIdentifiers.ecdsa_with_SHA512);
        noParams.add(X9ObjectIdentifiers.id_dsa_with_sha1);
        noParams.add(NISTObjectIdentifiers.dsa_with_sha224);
        noParams.add(NISTObjectIdentifiers.dsa_with_sha256);
        noParams.add(NISTObjectIdentifiers.dsa_with_sha384);
        noParams.add(NISTObjectIdentifiers.dsa_with_sha512);

        //
        // RFC 4491
        //
        noParams.add(CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_94);
        noParams.add(CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_2001);

        //
        // SPHINCS-256
        //
        noParams.add(BCObjectIdentifiers.sphincs256_with_SHA512);
        noParams.add(BCObjectIdentifiers.sphincs256_with_SHA3_512);

        //
        // SM2
        //
        noParams.add(GMObjectIdentifiers.sm2sign_with_sm3);

        //
        // PKCS 1.5 encrypted  algorithms
        //
        pkcs15RsaEncryption.add(PKCSObjectIdentifiers.sha1WithRSAEncryption);
        pkcs15RsaEncryption.add(PKCSObjectIdentifiers.sha224WithRSAEncryption);
        pkcs15RsaEncryption.add(PKCSObjectIdentifiers.sha256WithRSAEncryption);
        pkcs15RsaEncryption.add(PKCSObjectIdentifiers.sha384WithRSAEncryption);
        pkcs15RsaEncryption.add(PKCSObjectIdentifiers.sha512WithRSAEncryption);
        pkcs15RsaEncryption.add(TeleTrusTObjectIdentifiers.rsaSignatureWithripemd128);
        pkcs15RsaEncryption.add(TeleTrusTObjectIdentifiers.rsaSignatureWithripemd160);
        pkcs15RsaEncryption.add(TeleTrusTObjectIdentifiers.rsaSignatureWithripemd256);

        //
        // explicit params
        //
        AlgorithmIdentifier sha1AlgId = new AlgorithmIdentifier(OIWObjectIdentifiers.idSHA1, DERNull.INSTANCE);
        params.put("SHA1WITHRSAANDMGF1", createPSSParams(sha1AlgId, 20));

        AlgorithmIdentifier sha224AlgId = new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha224, DERNull.INSTANCE);
        params.put("SHA224WITHRSAANDMGF1", createPSSParams(sha224AlgId, 28));

        AlgorithmIdentifier sha256AlgId = new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha256, DERNull.INSTANCE);
        params.put("SHA256WITHRSAANDMGF1", createPSSParams(sha256AlgId, 32));

        AlgorithmIdentifier sha384AlgId = new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha384, DERNull.INSTANCE);
        params.put("SHA384WITHRSAANDMGF1", createPSSParams(sha384AlgId, 48));

        AlgorithmIdentifier sha512AlgId = new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha512, DERNull.INSTANCE);
        params.put("SHA512WITHRSAANDMGF1", createPSSParams(sha512AlgId, 64));

        //
        // digests
        //
        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(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);
    }

    private static AlgorithmIdentifier generate(String signatureAlgorithm)
    {
        AlgorithmIdentifier sigAlgId;
        AlgorithmIdentifier encAlgId;
        AlgorithmIdentifier digAlgId;

        String algorithmName = Strings.toUpperCase(signatureAlgorithm);
        ASN1ObjectIdentifier sigOID = (ASN1ObjectIdentifier)algorithms.get(algorithmName);
        if (sigOID == null)
        {
            throw new IllegalArgumentException("Unknown signature type requested: " + algorithmName);
        }

        if (noParams.contains(sigOID))
        {
            sigAlgId = new AlgorithmIdentifier(sigOID);
        }
        else if (params.containsKey(algorithmName))
        {
            sigAlgId = new AlgorithmIdentifier(sigOID, (ASN1Encodable)params.get(algorithmName));
        }
        else
        {
            sigAlgId = new AlgorithmIdentifier(sigOID, DERNull.INSTANCE);
        }

        if (pkcs15RsaEncryption.contains(sigOID))
        {
            encAlgId = new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, DERNull.INSTANCE);
        }
        else
        {
            encAlgId = sigAlgId;
        }

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

        return sigAlgId;
    }

    private static RSASSAPSSparams createPSSParams(AlgorithmIdentifier hashAlgId, int saltSize)
    {
        return new RSASSAPSSparams(
            hashAlgId,
            new AlgorithmIdentifier(PKCSObjectIdentifiers.id_mgf1, hashAlgId),
            new ASN1Integer(saltSize),
            new ASN1Integer(1));
    }

    public AlgorithmIdentifier find(String sigAlgName)
    {
        return generate(sigAlgName);
    }
}