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

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.kisa.KISAObjectIdentifiers;
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.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.Integers;

public class DefaultSecretKeySizeProvider
    implements SecretKeySizeProvider
{
    public static final SecretKeySizeProvider INSTANCE = new DefaultSecretKeySizeProvider();

    private static final Map KEY_SIZES;

    static
    {
        Map keySizes = new HashMap();

        keySizes.put(new ASN1ObjectIdentifier("1.2.840.113533.7.66.10"), Integers.valueOf(128));

        keySizes.put(PKCSObjectIdentifiers.des_EDE3_CBC, Integers.valueOf(192));
        keySizes.put(PKCSObjectIdentifiers.id_alg_CMS3DESwrap, Integers.valueOf(192));
        keySizes.put(PKCSObjectIdentifiers.des_EDE3_CBC, Integers.valueOf(192));

        keySizes.put(PKCSObjectIdentifiers.pbeWithSHA1AndDES_CBC, Integers.valueOf(64));
        keySizes.put(PKCSObjectIdentifiers.pbeWithMD5AndDES_CBC, Integers.valueOf(64));

        keySizes.put(NISTObjectIdentifiers.id_aes128_CBC, Integers.valueOf(128));
        keySizes.put(NISTObjectIdentifiers.id_aes192_CBC, Integers.valueOf(192));
        keySizes.put(NISTObjectIdentifiers.id_aes256_CBC, Integers.valueOf(256));
        keySizes.put(NISTObjectIdentifiers.id_aes128_GCM, Integers.valueOf(128));
        keySizes.put(NISTObjectIdentifiers.id_aes192_GCM, Integers.valueOf(192));
        keySizes.put(NISTObjectIdentifiers.id_aes256_GCM, Integers.valueOf(256));
        keySizes.put(NISTObjectIdentifiers.id_aes128_CCM, Integers.valueOf(128));
        keySizes.put(NISTObjectIdentifiers.id_aes192_CCM, Integers.valueOf(192));
        keySizes.put(NISTObjectIdentifiers.id_aes256_CCM, Integers.valueOf(256));
        keySizes.put(NISTObjectIdentifiers.id_aes128_wrap, Integers.valueOf(128));
        keySizes.put(NISTObjectIdentifiers.id_aes192_wrap, Integers.valueOf(192));
        keySizes.put(NISTObjectIdentifiers.id_aes256_wrap, Integers.valueOf(256));

        keySizes.put(NTTObjectIdentifiers.id_camellia128_cbc, Integers.valueOf(128));
        keySizes.put(NTTObjectIdentifiers.id_camellia192_cbc, Integers.valueOf(192));
        keySizes.put(NTTObjectIdentifiers.id_camellia256_cbc, Integers.valueOf(256));
        keySizes.put(NTTObjectIdentifiers.id_camellia128_wrap, Integers.valueOf(128));
        keySizes.put(NTTObjectIdentifiers.id_camellia192_wrap, Integers.valueOf(192));
        keySizes.put(NTTObjectIdentifiers.id_camellia256_wrap, Integers.valueOf(256));

        keySizes.put(KISAObjectIdentifiers.id_seedCBC, Integers.valueOf(128));

        keySizes.put(OIWObjectIdentifiers.desCBC, Integers.valueOf(64));

        keySizes.put(CryptoProObjectIdentifiers.gostR28147_gcfb, Integers.valueOf(256));

        KEY_SIZES = Collections.unmodifiableMap(keySizes);
    }

    public int getKeySize(AlgorithmIdentifier algorithmIdentifier)
    {
        int keySize = getKeySize(algorithmIdentifier.getAlgorithm());

        // just need the OID
        if (keySize > 0)
        {
            return keySize;
        }

        // TODO: support OID/Parameter key sizes (e.g. RC2).

        return -1;
    }

    public int getKeySize(ASN1ObjectIdentifier algorithm)
    {
        Integer keySize = (Integer)KEY_SIZES.get(algorithm);

        if (keySize != null)
        {
            return keySize.intValue();
        }

        return -1;
    }
}