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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.
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package org.bouncycastle.jcajce.provider.asymmetric.util;

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

import javax.crypto.KeyAgreementSpi;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.gnu.GNUObjectIdentifiers;
import org.bouncycastle.asn1.kisa.KISAObjectIdentifiers;
import org.bouncycastle.asn1.misc.MiscObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.ntt.NTTObjectIdentifiers;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.util.Integers;
import org.bouncycastle.util.Strings;

public abstract class BaseAgreementSpi
    extends KeyAgreementSpi
{
    private static final Map  defaultOids = new HashMap ();
    private static final Map  keySizes = new HashMap ();
    private static final Map  nameTable = new HashMap ();

    static
    {
        Integer i64 = Integers.valueOf(64);
        Integer i128 = Integers.valueOf(128);
        Integer i192 = Integers.valueOf(192);
        Integer i256 = Integers.valueOf(256);

        keySizes.put("DES", i64);
        keySizes.put("DESEDE", i192);
        keySizes.put("BLOWFISH", i128);
        keySizes.put("AES", i256);

        keySizes.put(NISTObjectIdentifiers.id_aes128_ECB.getId(), i128);
        keySizes.put(NISTObjectIdentifiers.id_aes192_ECB.getId(), i192);
        keySizes.put(NISTObjectIdentifiers.id_aes256_ECB.getId(), i256);
        keySizes.put(NISTObjectIdentifiers.id_aes128_CBC.getId(), i128);
        keySizes.put(NISTObjectIdentifiers.id_aes192_CBC.getId(), i192);
        keySizes.put(NISTObjectIdentifiers.id_aes256_CBC.getId(), i256);
        keySizes.put(NISTObjectIdentifiers.id_aes128_CFB.getId(), i128);
        keySizes.put(NISTObjectIdentifiers.id_aes192_CFB.getId(), i192);
        keySizes.put(NISTObjectIdentifiers.id_aes256_CFB.getId(), i256);
        keySizes.put(NISTObjectIdentifiers.id_aes128_OFB.getId(), i128);
        keySizes.put(NISTObjectIdentifiers.id_aes192_OFB.getId(), i192);
        keySizes.put(NISTObjectIdentifiers.id_aes256_OFB.getId(), i256);
        keySizes.put(NISTObjectIdentifiers.id_aes128_wrap.getId(), i128);
        keySizes.put(NISTObjectIdentifiers.id_aes192_wrap.getId(), i192);
        keySizes.put(NISTObjectIdentifiers.id_aes256_wrap.getId(), i256);
        keySizes.put(NISTObjectIdentifiers.id_aes128_CCM.getId(), i128);
        keySizes.put(NISTObjectIdentifiers.id_aes192_CCM.getId(), i192);
        keySizes.put(NISTObjectIdentifiers.id_aes256_CCM.getId(), i256);
        keySizes.put(NISTObjectIdentifiers.id_aes128_GCM.getId(), i128);
        keySizes.put(NISTObjectIdentifiers.id_aes192_GCM.getId(), i192);
        keySizes.put(NISTObjectIdentifiers.id_aes256_GCM.getId(), i256);

        keySizes.put(PKCSObjectIdentifiers.id_alg_CMS3DESwrap.getId(), i192);
        keySizes.put(PKCSObjectIdentifiers.des_EDE3_CBC.getId(), i192);
        keySizes.put(OIWObjectIdentifiers.desCBC.getId(), i64);

        keySizes.put(PKCSObjectIdentifiers.id_hmacWithSHA1.getId(), Integers.valueOf(160));
        keySizes.put(PKCSObjectIdentifiers.id_hmacWithSHA256.getId(), i256);
        keySizes.put(PKCSObjectIdentifiers.id_hmacWithSHA384.getId(), Integers.valueOf(384));
        keySizes.put(PKCSObjectIdentifiers.id_hmacWithSHA512.getId(), Integers.valueOf(512));

        defaultOids.put("DESEDE", PKCSObjectIdentifiers.des_EDE3_CBC);
        defaultOids.put("AES", NISTObjectIdentifiers.id_aes256_CBC);
        defaultOids.put("CAMELLIA", NTTObjectIdentifiers.id_camellia256_cbc);
        defaultOids.put("SEED", KISAObjectIdentifiers.id_seedCBC);
        defaultOids.put("DES", OIWObjectIdentifiers.desCBC);

        nameTable.put(MiscObjectIdentifiers.cast5CBC.getId(), "CAST5");
        nameTable.put(MiscObjectIdentifiers.as_sys_sec_alg_ideaCBC.getId(), "IDEA");
        nameTable.put(MiscObjectIdentifiers.cryptlib_algorithm_blowfish_ECB.getId(), "Blowfish");
        nameTable.put(MiscObjectIdentifiers.cryptlib_algorithm_blowfish_CBC.getId(), "Blowfish");
        nameTable.put(MiscObjectIdentifiers.cryptlib_algorithm_blowfish_CFB.getId(), "Blowfish");
        nameTable.put(MiscObjectIdentifiers.cryptlib_algorithm_blowfish_OFB.getId(), "Blowfish");
        nameTable.put(OIWObjectIdentifiers.desECB.getId(), "DES");
        nameTable.put(OIWObjectIdentifiers.desCBC.getId(), "DES");
        nameTable.put(OIWObjectIdentifiers.desCFB.getId(), "DES");
        nameTable.put(OIWObjectIdentifiers.desOFB.getId(), "DES");
        nameTable.put(OIWObjectIdentifiers.desEDE.getId(), "DESede");
        nameTable.put(PKCSObjectIdentifiers.des_EDE3_CBC.getId(), "DESede");
        nameTable.put(PKCSObjectIdentifiers.id_alg_CMS3DESwrap.getId(), "DESede");
        nameTable.put(PKCSObjectIdentifiers.id_alg_CMSRC2wrap.getId(), "RC2");
        nameTable.put(PKCSObjectIdentifiers.id_hmacWithSHA1.getId(), "HmacSHA1");
        nameTable.put(PKCSObjectIdentifiers.id_hmacWithSHA224.getId(), "HmacSHA224");
        nameTable.put(PKCSObjectIdentifiers.id_hmacWithSHA256.getId(), "HmacSHA256");
        nameTable.put(PKCSObjectIdentifiers.id_hmacWithSHA384.getId(), "HmacSHA384");
        nameTable.put(PKCSObjectIdentifiers.id_hmacWithSHA512.getId(), "HmacSHA512");
        nameTable.put(NTTObjectIdentifiers.id_camellia128_cbc.getId(), "Camellia");
        nameTable.put(NTTObjectIdentifiers.id_camellia192_cbc.getId(), "Camellia");
        nameTable.put(NTTObjectIdentifiers.id_camellia256_cbc.getId(), "Camellia");
        nameTable.put(NTTObjectIdentifiers.id_camellia128_wrap.getId(), "Camellia");
        nameTable.put(NTTObjectIdentifiers.id_camellia192_wrap.getId(), "Camellia");
        nameTable.put(NTTObjectIdentifiers.id_camellia256_wrap.getId(), "Camellia");
        nameTable.put(KISAObjectIdentifiers.id_npki_app_cmsSeed_wrap.getId(), "SEED");
        nameTable.put(KISAObjectIdentifiers.id_seedCBC.getId(), "SEED");
        nameTable.put(KISAObjectIdentifiers.id_seedMAC.getId(), "SEED");
        nameTable.put(CryptoProObjectIdentifiers.gostR28147_gcfb.getId(), "GOST28147");

        nameTable.put(NISTObjectIdentifiers.id_aes128_wrap.getId(), "AES");
        nameTable.put(NISTObjectIdentifiers.id_aes128_CCM.getId(), "AES");
        nameTable.put(NISTObjectIdentifiers.id_aes128_CCM.getId(), "AES");
    }

    protected static String getAlgorithm(String algDetails)
    {
        if (algDetails.indexOf('[') > 0)
        {
            return algDetails.substring(0, algDetails.indexOf('['));
        }

        if (algDetails.startsWith(NISTObjectIdentifiers.aes.getId()))
        {
            return "AES";
        }
        if (algDetails.startsWith(GNUObjectIdentifiers.Serpent.getId()))
        {
            return "Serpent";
        }

        String name = (String)nameTable.get(Strings.toUpperCase(algDetails));

        if (name != null)
        {
            return name;
        }

        return algDetails;
    }

    protected static int getKeySize(String algDetails)
    {
        if (algDetails.indexOf('[') > 0)
        {
            return (Integer.parseInt(algDetails.substring(algDetails.indexOf('[') + 1, algDetails.indexOf(']'))) + 7) / 8;
        }

        String algKey = Strings.toUpperCase(algDetails);
        if (!keySizes.containsKey(algKey))
        {
            return -1;
        }

        return ((Integer)keySizes.get(algKey)).intValue();
    }
}