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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 1.4. 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.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.ntt.NTTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.Integers;

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

    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.getId(), Integers.valueOf(192));

        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(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));

        KEY_SIZES = Collections.unmodifiableMap(keySizes);
    }

    public int getKeySize(AlgorithmIdentifier algorithmIdentifier)
    {
        // TODO: not all ciphers/oid relationships are this simple.
        Integer keySize = (Integer)KEY_SIZES.get(algorithmIdentifier.getAlgorithm());

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

        return -1;
    }


}