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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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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.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(NISTObjectIdentifiers.id_aes128_wrap_pad, Integers.valueOf(128));
        keySizes.put(NISTObjectIdentifiers.id_aes192_wrap_pad, Integers.valueOf(192));
        keySizes.put(NISTObjectIdentifiers.id_aes256_wrap_pad, 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;
    }
}